Axis Dynamixel AX-12 User`s manual

User’s Manual 2006-06-14

Closer to Real,

A X-12

DYNAMIXEL AX-12

Contents

1. Summary

1-1. Overview and Characteristics of AX-12

1-2. Main Specifications

Page 2

Page 3

2-2. Connector Assembly Page 5

4. Instruction Set and Examples

4-3. REG WRITE and ACTION Page 20

5. Example

Appendix

Page 24

Page 30

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DYNAMIXEL AX-12

1. Dynamixel AX-12

1-1. Overview and Characteristics of AX-12

Dynamixel AX-12 The Dynamixel series robot actuator is a smart, modular actuator that incorporates a gear reducer, a precision DC motor and a control circuitry with networking functionality, all in a single package. Despite its compact size, it can produce high torque and is made with high quality materials to provide the necessary strength and structural resilience to withstand large external forces. It also has the ability to detect and act upon internal conditions such as changes in internal temperature or supply voltage.

The Dynamixel series robot actuator has many advantages over similar products.

Precision Control Position and speed can be controlled with a resolution of 1024 steps.

Compliance Driving The degree of compliance can be adjusted and specified in controlling position.

Feedback Feedback for angular position, angular velocity, and load torque are available.

Alarm System The Dynamixel series robot actuator can alert the user when parameters deviate from user defined ranges (e.g. internal temperature, torque, voltage, etc) and can also handle the problem automatically (e.g. torque off)

Communication Wiring is easy with daisy chain connection, and it support communication speeds up to

1M BPS.

Distributed Control Position, velocity, compliance, and torque can be set with a single command packet, thus enabling the main processor to control many Dynamixel units even with very few resources.

Engineering Plastic The main body of the unit is made with high quality engineering plastic which enables it

Axis Bearing to handle high torque loads.

A bearing is used at the final axis to ensure no efficiency degradation with high external loads.

The LED can indicate the error status to the user. Status LED

Frames A hinge frame and a side mount frame are included.

2

DYNAMIXEL AX-12

1-2. Main Specifications

AX-12

Weight (g)

Gear Reduction Ratio

Input Voltage (V)

Final Max Holding Torque(kgf.cm) at 7V

12

55

1/254 at 10V

16.5

Resolution 0.35°

Operating Angle

Voltage

300°, Endless Turn

7V~10V (Recommended voltage: 9.6V)

Max. Current 900mA

Operate Temperature -5 ℃ ~ +85 ℃

Command Signal

Protocol Type

Link (Physical)

Digital Packet

Half duplex Asynchronous Serial Communication (8bit,1stop,No Parity)

TTL Level Multi Drop (daisy chain type Connector)

ID 254 ID (0~253)

Communication Speed 7343bps ~ 1 Mbps

Feedback Position, Load, Input Voltage, etc.

3

DYNAMIXEL AX-12

2. Dynamixel Operation

2-1. Mechanical Assembly

Frames Provided The two frames provided with AX-12 are shown below.

OF-12SH OF-12S

OF-12SH Installation The OF-12SH (hinge frame) can be installed on the AX-12 as the following.

Exploded view Assembled

OF-12S Installation The OF-12S (side mount frame) can be installed on the AX-12 as the following. The OF-

12S can be mounted on any of the three faces (left, right, or under side) of the AX-12 body as needed.

Horn2Body

Body2Body

Exploded view Assembled

Exploded view Assembled

4

DYNAMIXEL AX-12

2-2 . Connector Assembly

Assemble the connectors as shown below. Attach the wires to the terminals using the correct crimping tool. If you do not have access to a crimping tool, solder the terminals to the wires to ensure that they do not become loose during operation.

5

DYNAMIXEL AX-12

PC LINK

2-3. Dynamixel Wiring

Pin Assignment The connector pin assignments are as the following. The two connectors on the

Dynamixel are connected pin to pin, thus the AX-12 can be operated with only one connector attached.

Wiring

PIN1: GND

PIN2: VDD

PIN3: Data

PIN1: GND

PIN2: VDD

PIN3: Data

Connect the AX-2 actuators pin to pin as shown below. Many AX-12 actuators can be controlled with a single bus in this manner.

Main Controller

Control Box “CM-5”

To operate the Dynamixel actuators, the main controller must support TTL level half duplex

UART. A proprietary controller can be used, but the use of the Dynamixel controller CM-5 is recommended.

A PC can be used to control the Dynamixel via the CM-5 controller.

RS232

Level

TTL

Level

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DYNAMIXEL AX-12

bioloid A robot can be built using only the CM-5 controller and a number of AX-12 actuators. An edutainment robotic kit named “Bioloid” is available which is based on the CM-5 controller and the AX-12 actuators.

An example of a robot built with Bioloid

For details, please refer to the Bioloid manual.

Connection to UART To control the Dynamixel actuators, the main controller needs to convert its UART signals to the half duplex type. The recommended circuit diagram for this is shown below.

DIRECTION_PORT 5V

74HC126

TXD

74HC126

10K

DATA

DATA(PIN3)

RXD

9.6V

GND

VDD(PIN2)

GND(PIN1)

74HC04

CM-5 internal circuit (HALF DUPLEX UART)

The power is supplied to the Dynamixel actuator from the main controller through Pin 1 and Pin 2 of the Molex3P connector. (The circuit shown above is presented only to explain the use of half duplex UART. The CM-5 controller already has the above circuitry built in, thus the Dynamixel actuators can be directly connected to it)

The direction of data signals on the TTL level TxD and RxD depends on the

DIRECTION_PORT level as the following.

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DYNAMIXEL AX-12

• When the DIRECTION_PORT level is High: the signal TxD is output as Data

• When the DIRECTION_PORT level is Low: the signal Data is input as RxD

Half Duplex UART A multi-drop method of connecting multiple Dynamixel actuators to a single node is possible by using the half duplex UART. Thus a protocol that does not allow multiple transmissions at the same time should be maintained when controlling the Dynamixel actuators.

Main

Controller

[Multi Drop Link]

Caution Please ensure that the pin assignments are correct when connecting the Dynamixel actuators. Check the current consumption when powering on. The current consumption of a single Dynamixel actuator unit in standby mode should be no larger than 50mA

Connection Status Verification

When power is applied to the Dynamixel actuator, the LED blinks twice to confirm its connection.

Inspection If the above operation was not successful, then check the connector pin assignment and the voltage/current limit of the power supply.

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DYNAMIXEL AX-12

3. Communication Protocol

Unique ID

3-1. Communication Overview

Packet The main controller communicates with the Dynamixel units by sending and receiving data packets. There are two types of packets; the “Instruction Packet” (sent from the main controller to the Dynamixel actuators) and the “Status Packet” (sent from the

Dynamixel actuators to the main controller.)

Communication

Main

Controller

Instruction Packet

Status Packet

For the system connection below, if the main controller sends an instruction packet with the ID set to N, only the Dynamixel unit with this ID value will return its respective status packet and perform the required instruction.

Instruction Packet(ID=N)

Main

Controller

ID=0 ID=1

Status Packet(ID=N)

ID=N

If multiple Dynamixel units have the same ID value, multiple packets sent simultaneously collide, resulting in communication problems. Thus, it is imperative that no Dynamixel units share the same ID in a network node.

Protocol The Dynamixel actuators communicate through asynchronous serial communication with 8 bit, 1 stop bit and no parity.

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DYNAMIXEL AX-12

3-2. Instruction Packet

The Instruction Packet is the packet sent by the main controller to the Dynamixel units to send commands. The structure of the Instruction Packet is as the following.

Instruction Packet OXFF 0XFF ID LENGTH INSTRUCTION PARAMETER1 …PARAMETER N CHECK SUM

The meanings of each packet byte definition are as the following.

0XFF 0XFF

ID

The two 0XFF bytes indicate the start of an incoming packet.

The unique ID of a Dynamixel unit. There are 254 available ID values, ranging from

0X00 to 0XFD.

Broadcasting ID ID 0XFE is the Broadcasting ID which indicates all of the connected Dynamixel units.

Packets sent with this ID apply to all Dynamixel units on the network. Thus packets sent with a broadcasting ID will not return any status packets.

LENGTH

INSTRUCTION

PARAMETER0…N

CHECK SUM

The length of the packet where its value is “Number of parameters (N) + 2”

The instruction for the Dynamixel actuator to perform.

Used if there is additional information needed to be sent other than the instruction itself.

If the calculated value is larger than 255, the lower byte is defined as the checksum value.

~ represents the NOT logic operation.

3-3. Status Packet(Return Packet)

The computation method for the ‘Check Sum’ is as the following.

Check Sum = ~ (ID + Length + Instruction + Parameter1 + ... Parameter N)

The Status Packet is the response packet from the Dynamixel units to the Main

Controller after receiving an instruction packet. The structure of the status packet is as the following.

OXFF 0XFF ID LENGTH ERROR PARAMETER1 PARAMETER2…PARAMETER N CHECK SUM

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DYNAMIXEL AX-12

The meanings of each packet byte definition are as the following.

0XFF 0XFF

ID

LENGTH

ERROR

The two 0XFF bytes indicate the start of the packet.

The unique ID of the Dynamixel unit returning the packet. The initial value is set to 1.

The length of the packet where its value is “Number of parameters (N) + 2”

The byte representing errors sent from the Dynamixel unit. The meaning of each bit is as the following.

Bit Name

Bit 7 0

Bit 6

Bit 5

Instruction Error

Overload Error

Details

-

Set to 1 if an undefined instruction is sent or an action instruction is sent without a Reg_Write instruction.

Set to 1 if the specified maximum torque can't control the applied load.

Bit 4 Checksum Error Set to 1 if the checksum of the instruction packet is incorrect.

Bit 3

Bit 2

Bit 1

Bit 0

Range Error Set to 1 if the instruction sent is out of the defined range.

Overheating

Error

Angle Limit

Error

Input Voltage

Error

Set to 1 if the internal temperature of the Dynamixel unit is above the operating temperature range as defined in the control table.

Set as 1 if the Goal Position is set outside of the range between CW Angle Limit and CCW Angle

Limit.

Set to 1 if the voltage is out of the operating voltage range as defined in the control table.

PARAMETER0…N

CHECK SUM

Used if additional information is needed.

The computation method for the ‘Check Sum’ is as the following.

Check Sum = ~ (ID + Length + Instruction + Parameter1 + ... Parameter N)

If the calculated value is larger than 255, the lower byte is defined as the checksum value. ~ represents the NOT logic operation.

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DYNAMIXEL AX-12

3-4. Control

Table

EEPROM

Area

RAM

Area

10(0x0A)

11(0X0B)

12(0X0C)

13(0X0D)

14(0X0E)

15(0X0F)

16(0X10)

17(0X11)

18(0X12)

19(0X13)

20(0X14)

Address

0(0X00)

1(0X01)

2(0X02)

3(0X03)

4(0X04)

5(0X05)

6(0X06)

7(0X07)

8(0X08)

9(0X09)

21(0X15)

22(0X16)

23(0X17)

24(0X18)

25(0X19)

26(0X1A)

27(0X1B)

28(0X1C)

29(0X1D)

30(0X1E)

31(0X1F)

32(0X20)

33(0X21)

34(0X22)

35(0X23)

36(0X24)

37(0X25)

38(0X26)

39(0X27)

40(0X28)

41(0X29)

42(0X2A)

43(0X2B)

44(0X2C)

45(0X2D)

46[0x2E)

47[0x2F)

48[0x30)

49[0x31)

Item

Model Num ber(L)

Model Num ber(H)

Version of Firm ware

ID

Baud Rate

Return Delay T im e

CW Angle Lim it(L)

CW Angle Lim it(H)

CCW Angle Lim it(L)

CCW Angle Lim it(H)

(Reserved) the Highest Lim it T em perature the Lowest Lim it Voltage the Highest Lim it Voltage

Max T orque(L)

Max T orque(H)

Status Return Level

Alarm LED

Alarm Shutdown

(Reserved)

Down Calibration(L)

Down Calibration(H)

Up Calibration(L)

Up Calibration(H)

T orque Enable

LED

CW Com pliance Margin

CCW Com pliance Margin

CW Com pliance Slope

CCW Com pliance Slope

G oal Position(L)

G oal Position(H)

Moving Speed(L)

Moving Speed(H)

T orque Lim it(L)

T orque Lim it(H)

Present Position(L)

Present Position(H)

Present Speed(L)

Present Speed(H)

Present Load(L)

Present Load(H)

Present Voltage

Present T em perature

Registered Instruction

(Reserved)

Moving

Lock

Punch(L)

Punch(H)

12

Initial Value

12(0x0C)

0(0x00)

?

1(0x01)

1(0x01)

250(0xFA)

0(0x00)

0(0x00)

255(0xFF)

3(0x03)

0(0x00)

85(0x55)

60(0X3C)

190(0xBE)

255(0XFF)

3(0x03)

2(0x02)

4(0x04)

4(0x04)

0(0x00)

?

?

?

?

0(0x00)

0(0x00)

0(0x00)

0(0x00)

32(0x20)

32(0x20)

[Addr36]value

[Addr37]value

0

0

[Addr14] value

[Addr15] value

?

?

?

?

?

?

?

?

0(0x00)

0(0x00)

0(0x00)

0(0x00)

32(0x20)

0(0x00)

-

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD

Access

RD

RD

RD

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD

RD

RD

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD,W R

RD

RD

RD

RD

RD

RD

RD

RD

RD,W R

-

RD

RD,W R

RD,W R

RD,W R

DYNAMIXEL AX-12

Control Table The Control Table contains information on the status and operation of the Dynamixel actuator. The Dynamixel actuator is operated by writing values to its control table and its status is checked by reading values off its control table.

RAM and EEPROM The data values for the RAM area will be set to the default initial values whenever the power is turned on. However, the data values for the EEPROM area are non-volatile and will still remain even after the power is turned off.

Initial Value The Initial Value column on the right side of the control table shows the Factory Default

Values for the case of EEPROM area data, and shows the initial value when the power is turned on for the case of RAM area data.

The following explains the meaning of data stored in each of the addresses in the control table.

Address 0x00,0x01 Model Number. For AX-12, this value is 0X000C (12).

Address 0x02 Firmware Version.

Address 0x03 ID. The unique ID number assigned to each Dynamixel actuators for identifying them.

Different IDs are required for each Dynamixel actuators that are on the same network.

Address 0x04 Baud Rate. Determines the communication speed. The computation is done by the following formula.

Speed (BPS) = 2000000 / (Address4 + 1)

Data Value for each Major Baud Rate

Adress4

1

3

4

7

9

16

34

103

207

Hex

0X01

0X03

0X04

0X07

0X09

0X10

0X22

0X67

0XCF

Set BPS

1000000.0

500000.0

400000.0

250000.0

200000.0

117647.1

57142.9

19230.8

9615.4

Goal BPS

1000000.0

500000.0

400000.0

250000.0

200000.0

115200.0

57600.0

19200.0

9600.0

Error

0.000%

0.000%

0.000%

0.000%

0.000%

-2.124%

0.794%

-0.160%

-0.160%

Note

Caution

A maximum Baud Rate error of 3% is within the tolerance of UART communication.

The initial value of Baudrate is set to 1(1000000bps)

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DYNAMIXEL AX-12

Address 0x05 Return Delay Time. The time it takes for the Status Packet to return after the Instruction

Packet is sent. The delay time is given by 2uSec * Address5 value.

Address 0x06,0x07,0x08,0x09

Operating Angle Limit. Sets the Dynamixel actuator’s operating angle range. The Goal

Position needs to be within the range of: CW Angle Limit <= Goal Position <= CCW

Angle Limit. An Angle Limit Error will occur if the Goal Position is set outside this range set by the operating angle limits.

Address 0x0B the Highest Limit Temperature. The upper limit of the Dynamixel actuator’s operating temperature. If the internal temperature of the Dynamixel actuator gets higher than this value, the Over Heating Error Bit (Bit 2 of the Status Packet) will return the value 1, and an alarm will be set by Address 17, 18. The values are in Degrees Celsius.

Address 0x0C,0x0D the Lowest (Highest) Limit Voltage. The upper and lower limits of the Dynamixel actuator’s operating voltage. If the present voltage (Address 42) is out of the specified range, a Voltage Range Error Bit (Bit 0 of the Status Packet) will return the value 1, and an alarm will be set by Address 17, 18. The values are 10 times the actual voltage value. For example, if the Address 12 value is 80, then the lower voltage limit is set to

8V.

Address 0x0E,0x0F, 0x22,0x23

Max Torque. The maximum torque output for the Dynamixel actuator. When this value is set to 0, the Dynamixel actuator enters the Free Run mode. There are two locations where this maximum torque limit is defined; in the EEPROM (Address 0X0E, 0x0F) and in the RAM (Address 0x22, 0x23). When the power is turned on, the maximum torque limit value defined in the EEPROM is copied to the location in the RAM. The torque of the Dynamixel actuator is limited by the values located in the RAM (Address 0x22,

0x23).

Address 0X10 Status Return Level. Determines whether the Dynamixel actuator will return a Status

Packet after receiving an Instruction Packet.

Address16

0

1

2

Returning the Status Packet

Do not respond to any instructions

Respond only to READ_DATA instructions

Respond to all instructions

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DYNAMIXEL AX-12

In the case of an instruction which uses the Broadcast ID (0XFE) the Status Packet will not be returned regardless of the Address 0x10 value.

Address 0X11 Alarm LED. If the corresponding Bit is set to 1, the LED blinks when an Error occurs.

Bit Function

Bit 7 0

Bit 6 If set to 1, the LED blinks when an Instruction Error occurs

Bit 5 If set to 1, the LED blinks when an Overload Error occurs

Bit 4 If set to 1, the LED blinks when a Checksum Error occurs

Bit 3 If set to 1, the LED blinks when a Range Error occurs

Bit 2 If set to 1, the LED blinks when an Overheating Error occurs

Bit 1 If set to 1, the LED blinks when an Angle Limit Error occurs

Bit 0 If set to 1, the LED blinks when an Input Voltage Error occurs

This function operates following the “OR” logical operation of all bits. For example, if the value is set to 0X05, the LED will blink when an Input Voltage Error occurs or when an

Overheating Error occurs. Upon returning to a normal condition from an error state, the

LED stops blinking after 2 seconds.

Address 0X12 Alarm Shutdown. If the corresponding Bit is set to a 1, the Dynamixel actuator’s torque will be turned off when an error occurs.

Bit

Bit 7 0

Function

Bit 6 If set to 1, torque off when an Instruction Error occurs

Bit 5 If set to 1, torque off when an Overload Error occurs

Bit 4 If set to 1, torque off when a Checksum Error occurs

Bit 3 If set to 1, torque off when a Range Error occurs

Bit 2 If set to 1, torque off when an Overheating Error occurs

Bit 1 If set to 1, torque off when an Angle Limit Error occurs

Bit 0 If set to 1, torque off when an Input Voltage Error occurs

This function operates following the “OR” logical operation of all bits. However, unlike the Alarm LED, after returning to a normal condition, it maintains the torque off status.

To recover, the Torque Enable (Address0X18) needs to be reset to 1.

Address 0x14~0x17 Calibration. Data used for compensating for the differences between the potentiometers used in the Dynamixel units. The user cannot change this data.

The following (from Address 0x18) is in the RAM area.

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DYNAMIXEL AX-12

Address 0x18 Torque Enable. When the power is first turned on, the Dynamixel actuator enters the

Torque Free Run condition (zero torque). Setting the value in Address 0x18 to 1 enables the torque.

Address 0x19 LED. The LED turns on when set to 1 and turns off if set to 0.

Address 0x1A~0x1D Compliance Margin and Slope. The compliance of the Dynamixel actuator is defined by setting the compliance Margin and Slope. This feature can be utilized for absorbing shocks at the output shaft. The following graph shows how each compliance value

(length of A, B, C & D) is defined by the Position Error and applied torque.

CW

Goal Position

CCW

E

E

CW

X axis:Position Error

CCW

Y axis:Output Torque

A B C D

A : CCW Compliance Slope(Address0x1D)

B : CCW Compliance Margin(Address0x1B)

C : CW Compliance Margin(Address0x1A)

D : CW Compliance Slope (Address0x1C)

E : Punch(Address0x30,31)

Address 0X1E,0x1F Goal Position Requested angular position for the Dynamixel actuator output to move to.

Setting this value to 0x3ff moves the output shaft to the position at 300°.

150°

(Goal Position = 0x1ff)

300°

(Goal Position = 0x3ff)

300~360°

Invalid Angle

0°

(Goal Position = 0)

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DYNAMIXEL AX-12

Address 0x20,0x21 Moving Speed. Sets the angular velocity of the output moving to the Goal Position.

Setting this value to its maximum value of 0x3ff moves the output with an angular velocity of 114 RPM, provided that there is enough power supplied (The lowest velocity is when this value is set to 1. When set to 0, the velocity is the largest possible for the supplied voltage, e.g. no velocity control is applied.)

Address 0x24,0x25 Present Position. Current angular position of the Dynamixel actuator output.

Address 0x26,0x27 Present Speed. Current angular velocity of the Dynamixel actuator output.

Address 0x28,0x29 Present Load. The magnitude of the load on the operating Dynamixel actuator. Bit 10 is the direction of the load.

BIT

Value

15~11

0

10

Load Direction

9 8 7 6 5 4 3 2 1 0

Load Value

Load Direction = 0 : CCW Load, Load Direction = 1: CW Load

Address 0x2A Present Voltage. The voltage currently applied to the Dynamixel actuator. The value is

10 times the actual voltage. For example, 10V is represented as 100 (0x64).

Address 0x2B Present Temperature. The internal temperature of the Dynamixel actuator in Degrees

Celsius.

Address 0x2C Registered Instruction. Set to 1 when an instruction is assigned by the REG_WRITE command. Set to 0 after it completes the assigned instruction by the Action command.

Address 0x2E

Address 0x2F

Moving. Set to 1 when the Dynamixel actuator is moving by its own power.

Lock. If set to 1, only Address 0x18 to 0x23 can be written to and other areas cannot.

Once locked, it can only be unlocked by turning the power off.

Address 0x30,0x31 Punch. The minimum current supplied to the motor during operation. The initial value is set to 0x20 and its maximum value is 0x3ff.

Endless Turn If both values for the CW Angle Limit and the CCW Angle Limit are set to 0, an Endless

Turn mode can be implemented by setting the Goal Speed. This feature can be used for implementing a continuously rotating wheel.

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DYNAMIXEL AX-12

Goal Speed Setting

BIT

Value

15~11

0

10

Turn Direction

9 8 7 6 5 4

Speed Value

3 2 1

Turn Direction = 0 : CCW Direction Turn, Load Direction = 1: CW Direction Turn

0

Range Each data has a valid minimum and maximum values. Write instructions made outside of these valid ranges will return an error. The following table summarizes the data range for each register. 16 bit data registers are indicated with two bytes (L) and (H). Both bytes need to be written at the same time as one instruction packet.

18(0X12)

19(0X13)

24(0X18)

25(0X19)

26(0X1A)

27(0X1B)

28(0X1C)

29(0X1D)

30(0X1E)

32(0X20)

34(0X22)

44(0X2C)

47(0X2F)

48(0X30)

Write

Address

3(0X03)

4(0X04)

5(0X05)

6(0X06)

8(0X08)

11(0X0B)

12(0X0C)

13(0X0D)

14(0X0E)

16(0X10)

17(0X11)

Writing Item

ID

Baud Rate

Return Delay Time

CW Angle Limit

CCW Angle Limit the Highest Limit Temperature the Lowest Limit Voltage the Highest Limit Voltage

Max Torque

Status Return Level

Alarm LED

Alarm Shutdown

(Reserved)

Torque Enable

LED

CW Compliance Margin

CCW Compliance Margin

CW Compliance Slope

CCW Compliance Slope

Goal Position

Moving Speed

Torque Limit

Registered Instruction

Lock

Punch

2

2

1

2

1

1

1

1

1

1

1

1

1

2

2

1

1

1

1

2

1

Length

(bytes)

1

1

1

2

[Control Table Data Range and Length for Writing]

Min

0

0

1

0

0

1

0

0

1

0

0

0

0

0

0

0

0

0

0

0

50(0x32)

50(0x32)

0

0

0

Max

253(0xfd)

254(0xfe)

254(0xfe)

1023(0x3ff)

1023(0x3ff)

150(0x96)

250(0xfa)

250(0xfa)

1023(0x3ff)

2

127(0x7f)

127(0x7f)

1

1

1

254(0xfe)

254(0xfe)

254(0xfe)

254(0xfe)

1023(0x3ff)

1023(0x3ff)

1023(0x3ff)

1

1

1023(0x3ff)

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DYNAMIXEL AX-12

4-1. WRITE_DATA

Function

Length

Instruction

Parameter1

Parameter2

Parameter3

Parameter N+1

Example 1

4. Instruction Set and Examples

The following Instructions are available.

Instruction

PING

Function

No action. Used for obtaining a Status Packet

Value

Num ber of

Param eter

0x01 0

READ DATA Reading values in the Control Table

W RITE DATA W riting values to the Control Table

R EG W RITE

Sim ilar to W RITE_DATA, but stays in standby m ode until the ACION instruction is given

0x04

ACTIO N

RESET

SYNC W RITE

Triggers the action registered by the

REG _W RITE instruction

Changes the control table values of the

Dynam ixel actuator to the Factory Default Value settings

Used for controlling m any Dynam ixel actuators at the sam e tim e

0x05

0x06

0x83

To write data into the control table of the Dynamixel actuator

N+3 (N is the number of data to be written)

0X03

Starting address of the location where the data is to be written

1st data to be written

2nd data to be written

Nth data to be written

Setting the ID of a connected Dynamixel actuator to 1

0x02

0x03

2

2 ~

2 ~

0

0

4~

Write 1 to address 3 of the control table. The ID is transmitted using the Broadcasting ID

(0xFE).

19

DYNAMIXEL AX-12

Instruction Packet : 0XFF 0XFF 0XFE 0X04 0X03 0X03 0X01 0XF6`

ID LENGTH INSTRUCTION PARAMETERS CHECKSUM

Because it was transmitted with a Broadcast ID (0XFE), no status packets are returned.

4-2. READ_DATA

Function

Length

Instruction

Read data from the control table of a Dynamixel actuator

0X04

0X02

Parameter1

Parameter2

Example 2

Starting address of the location where the data is to be read

Length of the data to be read

Reading the internal temperature of the Dynamixel actuator with an ID of 1

Read 1 byte from address 0x2B of the control table.

Instruction Packet : 0XFF 0XFF 0X01 0X04 0X02 0X2B 0X01 0XCC`

ID LENGTH INSTRUCTION PARAMETERS . CHECKSUM

The returned Status Packet will be as the following.

Status Packet : 0XFF 0XFF 0X01 0X03 0X00 0X20 0XDB

ID LENGTH ERROR PARAMETER1 CHECKSUM

The data read is 0x20. Thus the current internal temperature of the Dynamixel actuator is approximately 32°C (0X20).

4-3. REG_WRITE과 ACTION

4-3-1. REG_WRITE

Function The REG_WRITE instruction is similar to the WRITE_DATA instruction, but the

20

DYNAMIXEL AX-12 execution timing is different. When the Instruction Packet is received the values are stored in the Buffer and the Write instruction is under a standby status. At this time, the

Registered Instruction register (Address 0x2C) is set to 1. After the Action Instruction

Packet is received, the registered Write instruction is finally executed.

Length

Instruction

Parameter1

Parameter2

Parameter3

Parameter N+1

4-3-2. ACTION

Function

Length

Instruction

Parameter

N+3 (N is the number of data to be written)

0X04


1st data to be written

2nd data to be written

Nth data to be written

Triggers the action registered by the REG_WRITE instruction

0X02

0X05

NONE

The ACTION instruction is useful when multiple Dynamixel actuators need to move simultaneously. When controlling multiple Dynamixel actuator units, slight time delays can occur between the 1st and last units to receive an instruction. The Dynamixel actuator handles this problem by using the ACTION instruction.

Broadcasting The Broadcast ID (0XFE) is used when sending ACTION instructions to more than two

Dynamixel actuators. Note that no packets are returned by this operation.

4-4. PING

Function

Length

Does not command any operations. Used for requesting a status packet or to check the existence of a Dynamixel actuator with a specific ID.

0X02

Instruction 0X01

Parameter NONE

21

4-5. RESET

Function

Length

Instruction

Parameter

Example 4

DYNAMIXEL AX-12

Example 3 Obtaining the status packet of the Dynamixel actuator with an ID of 1

Instruction Packet : 0XFF 0XFF 0X01 0X02 0X01 0XFB`

ID LENGTH INSTRUCTION CHECKSUM

The returned Status Packet is as the following

Status Packet : 0XFF 0XFF 0X01 0X02 0X00 0XFC

ID LENGTH ERROR CHECKSUM

Regardless of whether the Broadcasting ID is used or the Status Return Level (Address

16) is 0, a Status Packet is always returned by the PING instruction.

Changes the control table values of the Dynamixel actuator to the Factory Default Value settings

0X02

0X06

NONE

Resetting the Dynamixel actuator with an ID of 0

Instruction Packet : 0XFF 0XFF 0X00 0X02 0X06 0XF7`

ID LENGTH INSTRUCTION CHECKSUM

The returned Status Packet is as the following

Status Packet : 0XFF 0XFF 0X00 0X02 0X00 0XFD

ID LENGTH ERROR CHECKSUM

Note the ID of this Dynamixel actuator is now changed to 1 after the RESET instruction.

22

DYNAMIXEL AX-12

4-6. SYNC WRITE

Function Used for controlling many Dynamixel actuators at the same time. The communication time decreases by the Synch Write instruction since many instructions can be transmitted by a single instruction. However, you can use this instruction only when the lengths and addresses of the control table to be written to are the same. Also, the broadcasting ID needs to be used for transmitting.

ID

Length

Instruction

Parameter1

Parameter2

Parameter3

Parameter4

Parameter5

…

Parameter L+3

0XFE

(L + 1) * N + 4 (L: Data length for each Dynamixel actuator, N: The number of Dynamixel actuators)

0X83


The length of the data to be written (L)

The ID of the 1st Dynamixel actuator

The 1st data for the 1st Dynamixel actuator

The 2nd data for the 1st Dynamixel actuator

The Lth data for the 1st Dynamixel actuator

Data for the 1st Dynamixel actuator

Parameter L+4 The ID of the 2nd Dynamixel actuator

Parameter L+5 The 1st data for the 2nd Dynamixel actuator

Parameter L+6 The 2nd data for the 2nd Dynamixel actuator

…

Parameter 2L+4 The Lth data for the 2nd Dynamixel actuator

….

Example 5

Data for the 2nd Dynamixel actuator

Setting the following positions and velocities for 4 Dynamixel actuators

Dynamixel actuator with an ID of 0: to position 0X010 with a speed of 0X150




Instruction Packet : 0XFF 0XFF 0XFE 0X18 0X83 0X1E 0X04 0X00 0X10 0X00 0X50

0X01 0X01 0X20 0X02 0X60 0X03 0X02 0X30 0X00 0X70 0X01 0X03 0X20 0X02 0X80

0X03 0X12

No status packets are returned since the Broadcasting ID was used.

23

DYNAMIXEL AX-12

5. Example

For the following examples, we assume a Dynamixel actuator with an ID of 1 in Reset status and that the Baud rate is 57142 BPS.

Example 6 Reading the Model Number and Firmware Version of the Dynamixel actuator with an ID of 1

Instruction Packet Instruction = READ_DATA, Address = 0x00, Length = 0x03

Communication ->[Dynamixel]:FF FF 01 04 02 00 03 F5 (LEN:008)

<-[Dynamixel]:FF FF 01 05 00 74 00 08 7D (LEN:009)

Status Packet Result Model Number = 116 (0x74) (for the case of DX-116) Firmware Version = 0x08

Example 7 Changing the ID to 0 for a Dynamixel actuator with an ID of 1

Instruction Packet Instruction = WRITE_DATA, Address = 0x03, DATA = 0x00


<-[Dynamixel]:FF FF 01 02 00 FC (LEN:006)

Example 8 Changing the Baud Rate of a Dynamixel actuator to 1M bps



<-[Dynamixel]:FF FF 00 02 00 FD (LEN:006)

Example 9 Resetting the Return Delay Time to 4 uSec for a Dynamixel actuator with an ID of

0

A Return Delay Time Value of 1 corresponds to 2uSec.

24

DYNAMIXEL AX-12




It is recommended to set the Return Delay Time to the minimum value allowed by the

Main Controller.

Example 10 Limiting the operating angle range to 0°~150° for a Dynamixel actuator with an ID of 0

Since the CCW Angle Limit of 0x3ff corresponds to 300°, the angle 150° is represented by the value 0x1ff

Instruction Packet Instruction = WRITE_DATA, Address = 0x08, DATA = 0xff, 0x01

Communication ->[Dynamixel]:FF FF 00 05 03 08 FF 01 EF (LEN:009)


Example 11 Resetting the upper limit for the operating temperature to 80°C for a Dynamixel actuator with an ID of 0

Instruction Packet Instruction = WRITE_DATA, Address = 0x0B, DATA = 0x50

Communication ->[Dynamixel]:FF FF 00 04 03 0B 50 9D (LEN:008)


Example 12 Setting the operating voltage to 10V ~ 17V for a Dynamixel actuator with an ID of 0

10V is represented by 100 (0x64), and 17V by 170 (0xAA).

Instruction Packet Instruction = WRITE_DATA, Address = 0x0C, DATA = 0x64, 0xAA

Communication ->[Dynamixel]:FF FF 00 05 03 0C 64 AA DD (LEN:009)


25

DYNAMIXEL AX-12

Example 13 Setting the maximum torque to 50% of its maximum possible value for a

Dynamixel actuator with an ID of 0

Set the MAX Torque value located in the ROM area to 0x1ff which is 50% of the maximum value 0x3ff.

Instruction Packet Instruction = WRITE_DATA, Address = 0x0E, DATA = 0xff, 0x01

Communication ->[Dynamixel]:FF FF 00 05 03 0E FF 01 E9 (LEN:009)


To verify the effect of the adjusted Max Torque value, the power needs to be turned off and then on.

Example 14 Set the Dynamixel actuator with an ID of 0 to never return a Status Packet


Communication ->[Dynamixel]:FF FF 00 04 03 10 00 E8 (LEN:008)


The Status Packet is not returned starting with the following instruction.

Example 15 Set the Alarm to blink the LED and Shutdown (Torque off) the actuator when the operating temperature goes over the set limit

Since the Overheating Error is Bit 2, set the Alarm value to 0x04.

Instruction Packet Instruction = WRITE_DATA, Address = 0x11, DATA = 0x04, 0x04

Communication ->[Dynamixel]:FF FF 00 05 03 11 04 04 DE (LEN:009)


Example 16 Turn on the LED and Enable Torque for a Dynamixel actuator with an ID of 0


26

DYNAMIXEL AX-12

Communication

Example 17

Compliance

->[Dynamixel]:FF FF 00 05 03 18 01 01 DD (LEN:009)


You can verify the Torque Enabled status by trying to move the output of the actuator by hand.

Setting the Compliance Margin to 1 and Compliance Slope to 0x40 for a

Dynamixel actuator with an ID of 0

The Angle Error and Torque Output can be represented with the following graph.

CCW

CW

CCW

Goal Position

CW

X:Angle Error

Even if the position deviates a little from the goal position in the CW direction, a large amount of torque is generated in the CCW direction to compensate for this. However, since inertia must be considered, a realistic implementation differs from this approach.

Considering this, the given conditions can be represented by the following graph.

CW

CCW

Output Torque

CCW

Goal Position

A B C D

CW

Angle(Position)

A : CCW Compliance Slope (Address0x1D) = 0x40 (about 18.8°)

B : CCW Compliance Margin (Address0x1B) = 0x01 (about 0.29°)

C : CW Compliance Margin (Address0x01A) = 0x01 (about 0.29°)

D : CW Compliance Slope (Address0x1C) = 0x40 (about 18.8°)

27

DYNAMIXEL AX-12

Instruction Packet Instruction = WRITE_DATA, Address = 0x1A, DATA = 0x01, 0x01, 0x40, 0x40

Communication ->[Dynamixel]:FF FF 00 07 03 1A 01 01 40 40 59 (LEN:011)


The Compliance Slope takes effect with discrete steps of 2 n

(n is integer). Thus any

Compliance value between 0x11 and 0x20 has identical effects.

Example 18 Position the output of a Dynamixel actuator with an ID of 0 to 180° with an angular velocity of 057RPM

Set Address 0x1E (Goal Position) to 0x200 and Address 0x20 (Moving Speed) to 0x200.

Instruction Packet Instruction = WRITE_DATA, Address = 0x1E, DATA = 0x00, 0x02, 0x00, 0x02

Communication ->[Dynamixel]:FF FF 00 07 03 1E 00 02 00 02 D3 (LEN:011)


Example 19 Position the output of a Dynamixel actuator with an ID of 0 to 0° and Position the output of a Dynamixel actuator with an ID of 1 to 300°, and initiate the movement at the same time.

If the WRITE_DATA is used, the movement of the two actuators cannot be initiate at the same time, thus the REG_WRITE and ACTION instructions should be used instead.

Instruction Packet ID=0, Instruction = REG_WRITE, Address = 0x1E, DATA = 0x00, 0x00

ID=1, Instruction = REG_WRITE, Address = 0x1E, DATA = 0xff, 0x03

Communication ->[Dynamixel]:FF FF 00 05 04 1E 00 00 D8 (LEN:009)


->[Dynamixel]:FF FF 01 05 04 1E FF 03 D5 (LEN:009)

<-[Dynamixel]:FF FF 01 02 00 FC (LEN:006)

->[Dynamixel]:FF FF FE 02 05 FA (LEN:006)

<-[Dynamixel]: //No return packet against broadcasting ID

28

DYNAMIXEL AX-12

Example 20 Lock all addresses except for Address 0x18 ~ Address0x23 for a Dynamixel actuator with an ID of 0

Set Address 0x2F (Lock) to 1.

Instruction Packet Instruction = WRITE_DATA, Address = 0x2F, DATA = 0x01

Communication ->[Dynamixel]:FF FF 00 04 03 2F 01 C8 (LEN:008)


Once locked, the only way to unlock it is to remove the power.

If an attempt is made to access any locked data, an error is returned.

->[Dynamixel]:FF FF 00 05 03 30 40 00 87 (LEN:009)

<-[Dynamixel]:FF FF 00 02 08 F5 (LEN:006)

Range Error

Example 21 Set the minimum power (Punch) to 0x40 for a Dynamixel actuator with an ID of 0


Communication ->[Dynamixel]:FF FF 00 05 03 30 40 00 87 (LEN:009)


29

DYNAMIXEL AX-12

Half duplex UART

Appendix

Half duplex UART is a serial communication protocol where both TxD and RxD cannot be used at the same time. This method is generally used when many devices need to be connected to a single bus. Since more than one device are connected to the same bus, all the other devices need to be in input mode while one device is transmitting. The

Main Controller that controllers the Dynamixel actuators sets the communication direction to input mode, and only when it is transmitting an Instruction Packet, it changes the direction to output mode.

Return Delay Time

RS485 Direction Output Duration

Instruction Packet

Return Delay Time

Status Packet

The time it takes for the Dynamixel actuator to return the Status Packet after receiving an Instruction Packet. The Default Value is 160 uSec and can be changed via the

Control Table at Address 5. The Main Controller needs to change the Direction Port to input mode during the Return Delay Time after sending an instruction packet.

Tx,Rx Direction For Half Duplex UART, the transmission ending timing is important to change the direction to receiving mode. The bit definitions within the register that indicates

UART_STATUS are as the following

TXD_BUFFER_READY_BIT: Indicates that the transmission DATA can be loaded into the Buffer. Note that this only means that the SERIAL TX BUFFER is empty, and does not necessarily mean that the all the data transmitted before has left the CPU.

TXD_SHIFT_REGISTER_EMPTY_BIT: Set when all the Transmission Data has completed its transmission and left the CPU.

The TXD_BUFFER_READY_BIT is used when one byte is to be transmitted via the serial communication channel, and an example is shown below.

TxDByte(byte bData)

{

while(!TXD_BUFFER_READY_BIT); //wait until data can be loaded.

SerialTxDBuffer = bData; //data load to TxD buffer

}

30

DYNAMIXEL AX-12

LINE 1

LINE 2

LINE 3

LINE 4

LINE 5

LINE 6

LINE 7

LINE 8

LINE 9

LINE 10

LINE 11

LINE 12

When changing the direction, the TXD_SHIFT_REGISTER_EMPTY_BIT must be checked.

The following is an example program that sends an Instruction Packet.

DIRECTION_PORT = TX_DIRECTION;

TxDByte(0xff);

TxDByte(0xff);

TxDByte(bID);

TxDByte(bLength);

TxDByte(bInstruction);

TxDByte(Parameter0); TxDByte(Parameter1); …

DisableInterrupt(); // interrupt should be disable

TxDByte(Checksum); //last TxD while(!TXD_SHIFT_REGISTER_EMPTY_BIT); //Wait till last data bit has been sent

DIRECTION_PORT = RX_DIRECTION; //Direction change to RXD

EnableInterrupt(); // enable interrupt again

Please note the important lines between LINE 8 and LINE 12. Line 8 is necessary since an interrupt here may cause a delay longer than the return delay time and corruption to the front of the status packet may occur.

Byte to Byte Time The delay time between bytes when sending an instruction packet. If the delay time is over 100ms, then the Dynamixel actuator recognizes this as a communication problem and waits for the next header (0xff 0xff) of a packet again.

0xFF 0xFF ID

Byte To Byte Time

Length

The following is the source code of a program (Example.c) that accesses the Dynamixel actuator using the Atmega 128.

31

DYNAMIXEL AX-12

C Language Example : Dinamixel access with Atmega128

/*

* The Example of Dynamixel Evaluation with Atmega128

* Date : 2005.5.11

* Author : BS KIM

*/

/*

* included files

*/

#define ENABLE_BIT_DEFINITIONS

//#include <io.h>

#include <inttypes.h>

#include <avr/io.h>

#include <avr/interrupt.h>

#include <avr/signal.h>

#define cbi(REG8,BITNUM) REG8 &= ~(_BV(BITNUM))

#define sbi(REG8,BITNUM) REG8 |= _BV(BITNUM) typedef unsigned char byte; typedef unsigned int word;

#define ON 1

#define OFF 0

#define _ON 0

#define _OFF 1

//--- Control Table Address ---

//EEPROM AREA

#define P_MODEL_NUMBER_L 0

#define P_MODOEL_NUMBER_H 1

#define P_VERSION 2

#define P_ID 3

#define P_BAUD_RATE 4

#define P_RETURN_DELAY_TIME 5

#define P_CW_ANGLE_LIMIT_L 6

#define P_CW_ANGLE_LIMIT_H 7

#define P_CCW_ANGLE_LIMIT_L 8

#define P_CCW_ANGLE_LIMIT_H 9

#define P_SYSTEM_DATA2 10

#define P_LIMIT_TEMPERATURE 11

#define P_DOWN_LIMIT_VOLTAGE 12

#define P_UP_LIMIT_VOLTAGE 13

#define P_MAX_TORQUE_L 14

#define P_MAX_TORQUE_H 15

#define P_RETURN_LEVEL 16

#define P_ALARM_LED 17

#define P_ALARM_SHUTDOWN 18

#define P_OPERATING_MODE 19

#define P_DOWN_CALIBRATION_L 20

#define P_DOWN_CALIBRATION_H 21

#define P_UP_CALIBRATION_L 22

#define P_UP_CALIBRATION_H 23

#define P_TORQUE_ENABLE (24)

#define P_LED (25)

#define P_CW_COMPLIANCE_MARGIN (26)

#define P_CCW_COMPLIANCE_MARGIN (27)

#define P_CW_COMPLIANCE_SLOPE (28)

#define P_CCW_COMPLIANCE_SLOPE (29)

#define P_GOAL_POSITION_L (30)

#define P_GOAL_POSITION_H (31)

#define P_GOAL_SPEED_L (32)

#define P_GOAL_SPEED_H (33)

#define P_TORQUE_LIMIT_L (34)

#define P_TORQUE_LIMIT_H (35)

#define P_PRESENT_POSITION_L (36)

#define P_PRESENT_POSITION_H (37)

#define P_PRESENT_SPEED_L (38)

#define P_PRESENT_SPEED_H (39)

#define P_PRESENT_LOAD_L (40)

#define P_PRESENT_LOAD_H (41)

#define P_PRESENT_VOLTAGE (42)

#define P_PRESENT_TEMPERATURE (43)

#define P_REGISTERED_INSTRUCTION (44)

#define P_PAUSE_TIME (45)

#define P_MOVING (46)

#define P_LOCK (47)

#define P_PUNCH_L (48)

#define P_PUNCH_H (49)

//--- Instruction ---

#define INST_PING 0x01

#define INST_READ 0x02

#define INST_WRITE 0x03

#define INST_REG_WRITE 0x04

#define INST_ACTION 0x05

#define INST_RESET 0x06

#define INST_DIGITAL_RESET 0x07

#define INST_SYSTEM_READ 0x0C

#define INST_SYSTEM_WRITE 0x0D

#define INST_SYNC_WRITE 0x83

#define INST_SYNC_REG_WRITE 0x84

#define CLEAR_BUFFER gbRxBufferReadPointer = gbRxBufferWritePointer

#define DEFAULT_RETURN_PACKET_SIZE 6

#define BROADCASTING_ID 0xfe

#define TxD8 TxD81

#define RxD8 RxD81

//Hardware Dependent Item

#define DEFAULT_BAUD_RATE 34 //57600bps at 16MHz

////// For CM-5

#define RS485_TXD PORTE &= ~_BV(PE3),PORTE |= _BV(PE2)

//PORT_485_DIRECTION = 1

#define RS485_RXD PORTE &= ~_BV(PE2),PORTE |= _BV(PE3)

//PORT_485_DIRECTION = 0

/*

////// For CM-2

#define RS485_TXD PORTE |= _BV(PE2); //_485_DIRECTION = 1

#define RS485_RXD PORTE &= ~_BV(PE2);//PORT_485_DIRECTION = 0

*/

//#define TXD0_FINISH UCSR0A,6 //This bit is for checking TxD Buffer in CPU is empty or not.

//#define TXD1_FINISH UCSR1A,6

#define SET_TxD0_FINISH sbi(UCSR0A,6)

#define RESET_TXD0_FINISH cbi(UCSR0A,6)

#define CHECK_TXD0_FINISH bit_is_set(UCSR0A,6)

#define SET_TxD1_FINISH sbi(UCSR1A,6)

#define RESET_TXD1_FINISH cbi(UCSR1A,6)

#define CHECK_TXD1_FINISH bit_is_set(UCSR1A,6)

#define RX_INTERRUPT 0x01

#define TX_INTERRUPT 0x02

#define OVERFLOW_INTERRUPT 0x01

#define SERIAL_PORT0 0

#define SERIAL_PORT1 1

#define BIT_RS485_DIRECTION0 0x08 //Port E

#define BIT_RS485_DIRECTION1 0x04 //Port E

#define BIT_ZIGBEE_RESET PD4 //out : default 1 //PORTD

#define BIT_ENABLE_RXD_LINK_PC PD5 //out : default 1

#define BIT_ENABLE_RXD_LINK_ZIGBEE PD6 //out : default 0

#define BIT_LINK_PLUGIN PD7 //in, no pull up void TxD81(byte bTxdData); void TxD80(byte bTxdData); void TxDString(byte *bData); void TxD8Hex(byte bSentData); void TxD32Dec(long lLong); byte RxD81(void); void MiliSec(word wDelayTime); void PortInitialize(void); void SerialInitialize(byte bPort, byte bBaudrate, byte bInterrupt); byte TxPacket(byte bID, byte bInstruction, byte bParameterLength); byte RxPacket(byte bRxLength); void PrintBuffer(byte *bpPrintBuffer, byte bLength);

32

DYNAMIXEL AX-12

// --- Gloval Variable Number --- volatile byte gbpRxInterruptBuffer[256]; byte gbpParameter[128]; byte gbRxBufferReadPointer; byte gbpRxBuffer[128]; byte gbpTxBuffer[128]; volatile byte gbRxBufferWritePointer; int main(void)

{

byte bCount,bID, bTxPacketLength,bRxPacketLength;

PortInitialize(); //Port In/Out Direction Definition

RS485_RXD; //Set RS485 Direction to Input State.

SerialInitialize(SERIAL_PORT0,1,RX_INTERRUPT);//RS485

Initializing(RxInterrupt)

SerialInitialize(SERIAL_PORT1,DEFAULT_BAUD_RATE,0);

Initializing(None Interrupt)

//RS232

gbRxBufferReadPointer = gbRxBufferWritePointer = 0; //RS485

RxBuffer Clearing.

sei(); //Enable Interrupt -- Compiler Function

TxDString("\r\n [The Example of Dynamixel Evaluation with

ATmega128,GCC-AVR]");

//Dynamixel Communication Function Execution Step.

// Step 1. Parameter Setting (gbpParameter[]). In case of no parameter instruction(Ex. INST_PING), this step is not needed.

// Step 2. TxPacket(ID,INSTRUCTION,LengthOfParameter); --Total

TxPacket Length is returned

// Step 3. RxPacket(ExpectedReturnPacketLength); -- Real RxPacket

Length is returned

// Step 4 PrintBuffer(BufferStartPointer,LengthForPrinting);

bID = 1;

TxDString("\r\n\n Example 1. Scanning Dynamixels(0~9). -- Any Key to

Continue."); RxD8();

for(bCount = 0; bCount < 0x0A; bCount++)

{

bTxPacketLength = TxPacket(bCount,INST_PING,0);

bRxPacketLength = RxPacket(255);

TxDString("\r\n TxD:"); PrintBuffer(gbpTxBuffer,bTxPacketLength);

TxDString(", RxD:"); PrintBuffer(gbpRxBuffer,bRxPacketLength);

if(bRxPacketLength == DEFAULT_RETURN_PACKET_SIZE)

{

TxDString(" Found!! ID:");TxD8Hex(bCount);

bID = bCount;

}

}

TxDString("\r\n\n Example 2. Read Firmware Version. -- Any Key to


gbpParameter[0] = P_VERSION; //Address of Firmware Version

gbpParameter[1] = 1; //Read Length

bTxPacketLength = TxPacket(bID,INST_READ,2);

bRxPacketLength =

RxPacket(DEFAULT_RETURN_PACKET_SIZE+gbpParameter

[1]);


TxDString("\r\n RxD:"); PrintBuffer(gbpRxBuffer,bRxPacketLength);

if(bRxPacketLength == DEFAULT_RETURN_PACKET_SIZE+gbpParameter[1])

{

TxDString("\r\n Return Error : ");TxD8Hex(gbpRxBuffer[4]);

TxDString("\r\n Firmware Version : ");TxD8Hex(gbpRxBuffer[5]);

}

TxDString("\r\n\n Example 3. LED ON -- Any Key to Continue.");

RxD8();

gbpParameter[0] = P_LED; //Address of LED

gbpParameter[1] = 1; //Writing Data

bTxPacketLength = TxPacket(bID,INST_WRITE,2);

bRxPacketLength = RxPacket(DEFAULT_RETURN_PACKET_SIZE);



TxDString("\r\n\n Example 4. LED OFF -- Any Key to Continue.");

RxD8();

gbpParameter[0] = P_LED; //Address of LED






TxDString("\r\n\n Example 5. Read Control Table. -- Any Key to


gbpParameter[0] = 0; //Reading Address

gbpParameter[1] = 49; //Read Length

bTxPacketLength = TxPacket(bID,INST_READ,2);

bRxPacketLength =

RxPacket(DEFAULT_RETURN_PACKET_SIZE+gbpParameter

[1]);



if(bRxPacketLength == DEFAULT_RETURN_PACKET_SIZE+gbpParameter[1])

{

TxDString("\r\n");

for(bCount = 0; bCount < 49; bCount++)

{

TxD8('[');TxD8Hex(bCount);TxDString("]:");

TxD8Hex(gbpRxBuffer[bCount+5]);TxD8(' ');

}

}

TxDString("\r\n\n Example 6. Go 0x200 with Speed 0x100 -- Any Key to


gbpParameter[0] = P_GOAL_POSITION_L; //Address of Firmware Version

gbpParameter[1] = 0x00; //Writing Data P_GOAL_POSITION_L

gbpParameter[2] = 0x02; //Writing Data P_GOAL_POSITION_H

gbpParameter[3] = 0x00; //Writing Data P_GOAL_SPEED_L

gbpParameter[4] = 0x01; //Writing Data P_GOAL_SPEED_H





TxDString("\r\n\n Example 7. Go 0x00 with Speed 0x40 -- Any Key to



gbpParameter[1] = 0x00; //Writing Data P_GOAL_POSITION_L


gbpParameter[3] = 0x40; //Writing Data P_GOAL_SPEED_L






TxDString("\r\n\n Example 8. Go 0x3ff with Speed 0x3ff -- Any Key to



gbpParameter[1] = 0xff; //Writing Data P_GOAL_POSITION_L


gbpParameter[3] = 0xff; //Writing Data P_GOAL_SPEED_L






TxDString("\r\n\n Example 9. Torque Off -- Any Key to Continue.");

RxD8();

gbpParameter[0] = P_TORQUE_ENABLE; //Address of LED






TxDString("\r\n\n End. Push reset button for repeat");

33

DYNAMIXEL AX-12

while(1);

} void PortInitialize(void)

{

DDRA = DDRB = DDRC = DDRD = DDRE = DDRF = 0; //Set all port to input direction first.

PORTB = PORTC = PORTD = PORTE = PORTF = PORTG = 0x00; //PortData initialize to 0

cbi(SFIOR,2); //All Port Pull Up ready

DDRE |= (BIT_RS485_DIRECTION0|BIT_RS485_DIRECTION1); //set output the bit RS485direction

DDRD |=

(BIT_ZIGBEE_RESET|BIT_ENABLE_RXD_LINK_PC|BIT_ENA

BLE_RXD_LINK_ZIGBEE);

PORTD &= ~_BV(BIT_LINK_PLUGIN); // no pull up

PORTD |= _BV(BIT_ZIGBEE_RESET);

PORTD |= _BV(BIT_ENABLE_RXD_LINK_PC);

PORTD |= _BV(BIT_ENABLE_RXD_LINK_ZIGBEE);

}

/*

TxPacket() send data to RS485.

TxPacket() needs 3 parameter; ID of Dynamixel, Instruction byte,

Length of parameters.

TxPacket() return length of Return packet from Dynamixel.

*/ byte TxPacket(byte bID, byte bInstruction, byte bParameterLength)

{

byte bCount,bCheckSum,bPacketLength;

gbpTxBuffer[0] = 0xff;

gbpTxBuffer[1] = 0xff;

gbpTxBuffer[2] = bID;

gbpTxBuffer[3] = bParameterLength+2;

//Length(Paramter,Instruction,Checksum)

gbpTxBuffer[4] = bInstruction;

for(bCount = 0; bCount < bParameterLength; bCount++)

{

gbpTxBuffer[bCount+5] = gbpParameter[bCount];

}

bCheckSum = 0;

bPacketLength = bParameterLength+4+2;

for(bCount = 2; bCount < bPacketLength-1; bCount++) //except

0xff,checksum

{

bCheckSum += gbpTxBuffer[bCount];

}

gbpTxBuffer[bCount] = ~bCheckSum; //Writing Checksum with Bit

Inversion

RS485_TXD;

for(bCount = 0; bCount < bPacketLength; bCount++)

{

sbi(UCSR0A,6);//SET_TXD0_FINISH;

TxD80(gbpTxBuffer[bCount]);

}

while(!CHECK_TXD0_FINISH); //Wait until TXD Shift register empty

RS485_RXD;

return(bPacketLength);

}

/*

RxPacket() read data from buffer.

RxPacket() need a Parameter; Total length of Return Packet.

RxPacket() return Length of Return Packet.

*/ byte RxPacket(byte bRxPacketLength)

{

#define RX_TIMEOUT_COUNT2 3000L

#define RX_TIMEOUT_COUNT1 (RX_TIMEOUT_COUNT2*10L)

unsigned long ulCounter;

byte bCount, bLength, bChecksum;

byte bTimeout;

bTimeout = 0;

for(bCount = 0; bCount < bRxPacketLength; bCount++)

{

ulCounter = 0;

while(gbRxBufferReadPointer == gbRxBufferWritePointer)

{

if(ulCounter++ > RX_TIMEOUT_COUNT1)

{

bTimeout = 1;

break;

}

}

if(bTimeout) break;

gbpRxBuffer[bCount] gbpRxInterruptBuffer[gbRxBufferReadPointer++];

=

}

bLength = bCount;

bChecksum = 0;

if(gbpTxBuffer[2] != BROADCASTING_ID)

{

if(bTimeout && bRxPacketLength != 255)

{

TxDString("\r\n [Error:RxD Timeout]");

CLEAR_BUFFER;

}

if(bLength > 3) //checking is available.

{

if(gbpRxBuffer[0] != 0xff || gbpRxBuffer[1] != 0xff )

{

TxDString("\r\n [Error:Wrong Header]");

CLEAR_BUFFER;

return 0;

}

if(gbpRxBuffer[2] != gbpTxBuffer[2] )

{

TxDString("\r\n [Error:TxID != RxID]");

CLEAR_BUFFER;

return 0;

}

if(gbpRxBuffer[3] != bLength-4)

{

TxDString("\r\n [Error:Wrong Length]");

CLEAR_BUFFER;

return 0;

}

for(bCount = 2; bCount < bLength; bCount++) bChecksum += gbpRxBuffer[bCount];

if(bChecksum != 0xff)

{

TxDString("\r\n [Error:Wrong CheckSum]");

CLEAR_BUFFER;

return 0;

}

}

}

return bLength;

}

/*

PrintBuffer() print data in Hex code.

PrintBuffer() needs two parameter; name of Pointer(gbpTxBuffer, gbpRxBuffer)

*/ void PrintBuffer(byte *bpPrintBuffer, byte bLength)

{

byte bCount;

for(bCount = 0; bCount < bLength; bCount++)

{

TxD8Hex(bpPrintBuffer[bCount]);

TxD8(' ');

}

TxDString("(LEN:");TxD8Hex(bLength);TxD8(')');

}

34

DYNAMIXEL AX-12

/*

Print value of Baud Rate.

*/ void PrintBaudrate(void)

{

TxDString("\r\n

RS232:");TxD32Dec((16000000L/8L)/((long)UBRR1L+1

L) ); TxDString(" BPS,");

TxDString(" RS485:");TxD32Dec((16000000L/8L)/((long)UBRR0L+1L) );

TxDString(" BPS");

}

/*Hardware Dependent Item*/

#define TXD1_READY bit_is_set(UCSR1A,5)

//(UCSR1A_Bit5)

#define TXD1_DATA (UDR1)

#define RXD1_READY

#define RXD1_DATA bit_is_set(UCSR1A,7)

(UDR1)

#define TXD0_READY

#define TXD0_DATA

#define RXD0_READY

#define RXD0_DATA bit_is_set(UCSR0A,5)

(UDR0) bit_is_set(UCSR0A,7)

(UDR0)

/*

SerialInitialize() set Serial Port to initial state.

Vide Mega128 Data sheet about Setting bit of register.

SerialInitialize() needs port, Baud rate, Interrupt value.

*/ void SerialInitialize(byte bPort, byte bBaudrate, byte bInterrupt)

{

if(bPort == SERIAL_PORT0)

{

UBRR0H = 0; UBRR0L = bBaudrate;

UCSR0A = 0x02; UCSR0B = 0x18;

if(bInterrupt&RX_INTERRUPT) sbi(UCSR0B,7); // RxD interrupt enable

UCSR0C = 0x06; UDR0 = 0xFF;

sbi(UCSR0A,6);//SET_TXD0_FINISH; // Note. set 1, then 0 is read

}

else if(bPort == SERIAL_PORT1)

{

UBRR1H = 0; UBRR1L = bBaudrate;

UCSR1A = 0x02; UCSR1B = 0x18;

if(bInterrupt&RX_INTERRUPT) sbi(UCSR1B,7); // RxD interrupt enable

UCSR1C = 0x06; UDR1 = 0xFF;

sbi(UCSR1A,6);//SET_TXD1_FINISH; // Note. set 1, then 0 is read

}

}

/*

TxD8Hex() print data seperatly. ex> 0x1a -> '1' 'a'.

*/ void TxD8Hex(byte bSentData)

{

byte bTmp;

bTmp =((byte)(bSentData>>4)&0x0f) + (byte)'0';

if(bTmp > '9') bTmp += 7;

TxD8(bTmp);

bTmp =(byte)(bSentData & 0x0f) + (byte)'0';

if(bTmp > '9') bTmp += 7;

TxD8(bTmp);

}

/*

TxD80() send data to USART 0.

*/ void TxD80(byte bTxdData)

{

while(!TXD0_READY);

TXD0_DATA = bTxdData;

}

/*

TXD81() send data to USART 1.

*/ void TxD81(byte bTxdData)

{

while(!TXD1_READY);

TXD1_DATA = bTxdData;

}

/*

TXD32Dex() change data to decimal number system

*/ void TxD32Dec(long lLong)

{

byte bCount, bPrinted;

long lTmp,lDigit;

bPrinted = 0;

if(lLong < 0)

{

lLong = -lLong;

TxD8('-');

}

lDigit = 1000000000L;

for(bCount = 0; bCount < 9; bCount++)

{

lTmp = (byte)(lLong/lDigit);

if(lTmp)

{

TxD8(((byte)lTmp)+'0');

bPrinted = 1;

}

else if(bPrinted) TxD8(((byte)lTmp)+'0');

lLong -= ((long)lTmp)*lDigit;

lDigit = lDigit/10;

}

lTmp = (byte)(lLong/lDigit);

/*if(lTmp)*/ TxD8(((byte)lTmp)+'0');

}

/*

TxDString() prints data in ACSII code.

*/ void TxDString(byte *bData)

{

while(*bData)

{

TxD8(*bData++);

}

}

/*

RxD81() read data from UART1.

RxD81() return Read data.

*/ byte RxD81(void)

{

while(!RXD1_READY);

return(RXD1_DATA);

}

/*

SIGNAL() UART0 Rx Interrupt - write data to buffer

*/

SIGNAL (SIG_UART0_RECV)

{

gbpRxInterruptBuffer[(gbRxBufferWritePointer++)] = RXD0_DATA;

}

35

DYNAMIXEL AX-12

Connector

Female Connector

Male Connector

Company Name : Molex

Pin Number: 4

Male

Female

Molex Part Number

22-03-5045

50-37-5043

Old Part Number

5267-03

5264-03

Temperature range : -40°C to +105°C

Contact Insertion Force-max : 14.7N (3.30 lb)

Contact Retention Force-min : 14.7N (3.30 lb) www.molex.com or www.molex.co.jp for more detail information

Pin No.1

36

DYNAMIXEL AX-12

Dimension

CM-5 Dedicated AX-12 control box. Able to control 30 AX-12 actuators.

6 push buttons (5 for selection, 1 for reset)

Optional installable wireless devices available

Battery compartment (AA x 8) with recharging capability (when connected to an external

SMPS)

CM-5

37

Axis Dynamixel AX-12 User`s manual

Contents

1. Summary

4. Instruction Set and Examples

5. Example

Appendix

1. Dynamixel AX-12

1-1. Overview and Characteristics of AX-12

1-2. Main Specifications

2. Dynamixel Operation

2-1. Mechanical Assembly

2-2 . Connector Assembly

2-3. Dynamixel Wiring

3. Communication Protocol

3-1. Communication Overview

3-2. Instruction Packet

3-3. Status Packet(Return Packet)

3-4. Control

Table

4. Instruction Set and Examples

4-2. READ_DATA

4-3. REG_WRITE과 ACTION

4-3-1. REG_WRITE

4-3-2. ACTION

4-4. PING

4-5. RESET

4-6. SYNC WRITE

5. Example

Appendix

Related manuals

Axis Dynamixel AX-12 User`s manual

Contents

1. Summary

4. Instruction Set and Examples

5. Example

Appendix

1. Dynamixel AX-12

1-1. Overview and Characteristics of AX-12

1-2. Main Specifications

2. Dynamixel Operation

2-1. Mechanical Assembly

2-2 . Connector Assembly

2-3. Dynamixel Wiring

3. Communication Protocol

3-1. Communication Overview

3-2. Instruction Packet

3-3. Status Packet(Return Packet)

3-4. Control

Table

4. Instruction Set and Examples

4-2. READ_DATA

4-3. REG_WRITE과 ACTION

4-3-1. REG_WRITE

4-3-2. ACTION

4-4. PING

4-5. RESET

4-6. SYNC WRITE

5. Example

Appendix

Related manuals

Robotis

RX-28

Robotis

Dynamixel RX-64

Robotis

Dynamixel RX-64

Robotis

DX-113