Digi M10 Technical overview and Specifications

Digi M10 Technical overview and Specifications
Digi m10
Satellite Modem
Hardware Reference
Date: 24 November 2009
90033937_B
Copyright Notice
Digi International has prepared this manual for the use of its employees, agents, and its
customers. This manual contains proprietary information, which is protected by copyright.
Preparing derivative works or providing instruction based on this manual is prohibited without
written permission from Digi International.
All information in this manual is accurate and reliable to the best of Digi International's
knowledge. Digi International may make improvements and / or changes in this manual at any
time without prior notice.
Trademarks
The Digi m10 is a registered trademark of Digi International Inc. All other company and / or
product names mentioned in this manual are the property of their respective owners.
Document Revision History
Version
Description
Date
A
Initial release of the new hardware reference manual
21 Sep
2009
B
Extended packet information removed. Images updated.
10 Nov 2009
Digi m10 Hardware Reference v 1.20
Table of Contents
About This Manual......................................................................................................................... 7
Target Audience .......................................................................................................................... 7
Symbols Used in This Manual ..................................................................................................... 7
Reference Documents ................................................................................................................. 7
Where to Get Help ....................................................................................................................... 8
1. Overview of the Digi m10 ...................................................................................................... 9
2. Interfaces ................................................................................................................................ 9
2.1
Connector Pins ............................................................................................................... 9
2.2
Serial Interface ............................................................................................................. 12
2.3
Power and Ground ....................................................................................................... 12
2.4
Power Enable ............................................................................................................... 12
2.4.1
Powering Up ............................................................................................................ 13
2.4.2
Powering Down ........................................................................................................ 13
2.5
DA (Data Available) ...................................................................................................... 14
2.6
SA (Satellite Available) ................................................................................................. 14
2.7
RF Interface.................................................................................................................. 15
3. Technical Specifications ..................................................................................................... 17
3.1
Environmental .............................................................................................................. 17
3.1.1
Electromagnetic Compatibility ................................................................................. 17
3.1.1.1
Radiated Emissions ........................................................................................ 17
3.1.1.2
Conducted Emissions ..................................................................................... 17
3.1.1.3
Radiated Immunity .......................................................................................... 17
3.1.1.4
Conducted Immunity ....................................................................................... 18
3.1.1.5
Electrostatic Discharge ................................................................................... 18
3.1.2
RoHS........................................................................................................................ 18
3.1.3
Operating Temperature............................................................................................ 18
3.1.4
Storage Temperature ............................................................................................... 19
3.1.5
Operational Shock ................................................................................................... 19
3.1.6
Operational Vibration ............................................................................................... 19
3.2
Electrical ....................................................................................................................... 19
3.2.1
Power Design ........................................................................................................... 20
3.2.1.1
Power Supply .................................................................................................. 20
3.2.1.2
Typical Power Consumption ........................................................................... 20
3.2.2
Digital Input / Output Specifications ......................................................................... 21
3.2.3
Lifespan ................................................................................................................... 21
3.2.3.1
Design ............................................................................................................. 21
3.2.3.2
Failure Rate ..................................................................................................... 21
3.3
Mechanical ................................................................................................................... 21
3.3.1
Module Size ............................................................................................................. 21
3.3.2
Mounting .................................................................................................................. 22
4. Approvals and Certifications .............................................................................................. 23
5. Using the Digi m10 .............................................................................................................. 24
5.1
Interfacing with the Digi m10 ........................................................................................ 24
5.2
The Digi m10 JumpStart Kit ......................................................................................... 24
6. Antenna Information ............................................................................................................ 27
Appendix A: Digi m10 Mechanical Drawings ............................................................................ 28
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Appendix B: Digi m10 Development Board Schematic ........................................................... 32
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List of Tables
Table 1: Connector Pins on the Digi m10 ...................................................................................... 11
Table 2: Transmit and Receive Pins.............................................................................................. 12
Table 3: Power Pins ...................................................................................................................... 12
Table 4: Power Enable Pin ............................................................................................................ 12
Table 5: DA Pin.............................................................................................................................. 14
Table 6: SA Pin .............................................................................................................................. 15
Table 7: RF Interface Details ......................................................................................................... 15
Table 8: Operating Conditions ....................................................................................................... 19
Table 9: Digital I/O Electrical Specifications .................................................................................. 21
List of Figures
Figure 1: Block Diagram .................................................................................................................. 9
Figure 2: Digi m10 Pin Numbering ................................................................................................ 10
Figure 3: Pin Assignment .............................................................................................................. 11
Figure 4: Timing Diagram for Powering Up ................................................................................... 13
Figure 5: Timing Diagram for Powering Down .............................................................................. 14
Figure 6: Timing Diagram for Data Available ................................................................................ 14
Figure 7: Timing Diagram for Satellite Available ........................................................................... 15
Figure 8: RF Connector on the Digi m10 ....................................................................................... 15
Figure 9: Digi m10 Dimensions ..................................................................................................... 22
Figure 10: Interface Between the Host Controller and the Digi m10 ............................................. 24
Figure 11: Layout of the Development Board ................................................................................ 25
Figure 12: Digi m10 Mechanical Drawing ...................................................................................... 28
Figure 13: Digi m10 Mechanical Drawing: Part A.......................................................................... 28
Figure 14: Digi m10 Mechanical Drawing: Part B.......................................................................... 29
Figure 15: Digi m10 Mechanical Drawing: Part C ......................................................................... 30
Figure 16: Digi m10 Mechanical Drawing: Part D ......................................................................... 31
Figure 17: Development Board Schematic .................................................................................... 33
Figure 18: Development Board Schematic (Part A) ...................................................................... 34
Figure 19: Development Board Schematic (Part B) ...................................................................... 34
Figure 20: Development Board Schematic (Part C) ...................................................................... 34
Figure 21: Development Board Schematic (Part D) ...................................................................... 35
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About This Manual
This manual defines and specifies the functions of the Digi m10 and its usage. It also contains
guidelines for using the development board which comes with the Digi m10 JumpStart Kit.
Target Audience
The target audience for this user manual comprises engineers and business managers who want
to augment their company's existing asset-tracking systems with satellite networks. A typical user
would be an engineer who is well- versed with wireless data communications.
Symbols Used in This Manual
Symbol
Description
Provides additional information corresponding to the topic that is being discussed.
Warning! If ignored, may cause permanent damage to the development kit or injury
to a person.
Caution! Failure to comply with a caution may result in failure or damage to the
device.
Danger! Failure to comply with a danger symbol may result in serious injury.
Reference Documents
The following documents have been used in the preparation of this user manual.
 Department of Defense Test Method Standard for Environmental Engineering
Considerations and Laboratory Tests, MIL STD 810E
 European Telecommunications Standards Institute, EN 300 832 (A1 version 1.1.1),
Electromagnetic Compatibility for Mobile Earth Stations.
 International Electrotechnical Commission, IEC 1000-4-4, Testing and Measurement
Techniques -- Immunity to Fast Transient / Burst Immunity Test.
 International Electrotechnical Commission, IEC 61000-4-6, Testing and
Measurement Techniques -- Immunity to Conducted Disturbances, Induced by
Radio-Frequency Fields.
 ORBCOMM Serial Interface Specification, E80050015.
 ORBCOMM Subscriber Communicator (SC) Standards and Specifications,
E25050102.
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



ORBCOMM Subscriber Communicator Type Approval Plan, A25TP0017.
ORBCOMM System Overview, A80TD0008.
RoHS FAQ -- http://www.rohs.gov.uk/FAQs.aspx#10
Society of Automotive Engineers, SAE J1455, Joint SAE / TMC Recommended
Environmental Practices for Electronic Equipment Design (Heavy-Duty Trucks).
 Technical Requirements for Satellite Earth Stations and Systems (SES); Mobile Earth
Stations (MES) Providing Low Bit Rate Data Communications (LBRDC) using Low
Earth Orbiting (LEO) satellites operating below 1 GHz, EN 3200 721.
Where to Get Help
For additional information or clarifications regarding this user manual, please get in touch with
Digi International using the contact information provided below.
Address
11001 Bren Road East
Minnetonka, MN 55343
Phone
952-912-3456
Email
http://www.digi.com/support/eservice/login.jsp
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1. Overview of the Digi m10
The Digi m10 is an ORBCOMM Subscriber Communicator, which enables modem-like access to
the ORBCOMM satellite network. It is ideal for machine-to-machine (M2M) applications (e.g.
asset tracking, utility meters, pipeline monitoring, etc.) that monitor or control remote assets. It
can be added to an existing tracking system or run as a stand-alone modem.
Figure 1: Block Diagram
2. Interfaces
This section explains the different interfaces available on the Digi m10.
2.1
Connector Pins
The host controller provides power and ground, and communicates serially with the Digi m10.
The Digi m10 is outfitted with a factory-mounted, 14pin (7 pins across 2 rows) SAMTEC 1mm
pitch, standard socket connector (MLE-107-01-G-DV-K). The details of the pin designations are
provided below.
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Figure 2: Digi m10 Pin Numbering
The connector provides the necessary interface signals to communicate over a 3.3V TTL level
serial link and to power Digi m10. Basic communication can be established using the Tx & Rx
lines and the remaining signals provide additional handshaking (RTS/CTS), status (SA/DA) and
debug information (Dbg_Tx/Dbg_Rx) as described in the following sections.
Refer to Table 1 for details. The Digi m10 can be connected to the host PCB using a 14-pin
SAMTEC 1mm pitch, stacker header connector (MW-07-03-G-D-147-065-P).
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Figure 3: Pin Assignment
Table 1: Connector Pins on the Digi m10
Pin
Name
Description
1
VCC
Supply
2
GND
Ground
3
VCC
Supply
4
GND
Ground
5
PWR_EN Digi m10 Power Enable
Digital I/O
Comments
Direction
Input
6
GND
7
RX
3.3 V RS232 Interface. Host controller to the Digi
m10
Input
8
TX
3.3V RS232 Interface. Digi m10 to host controller.
Output
9
SA
Satellite Available
Output
10
DA
Data Available
Output
11
Dbg_Tx
3.3V UART Interface Digi M10 to Debug Port
Output
12
Dbg_Rx
3.3V UART Interface Debug Port to Digi m10
Input
13
RTS
3.3V UART Interface. Host controller to Digi m10
Input
14
CTS
3.3V UART Interface. Digi m10 to Host controller
Output
Pulled low
using 47KΩ
Ground
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2.2
Serial Interface
The main serial interface provides device management and monitoring using 3.3 V levels. The
serial data is carried on the Transmit (TX) and Receive (RX) lines. The details of the Transmit
and Receive pins are shown in Table 2. An RS232 level shifter is required to connect the Digi
m10 to a PC. This is already available on the development board, which comes with the Digi m10
JumpStart Kit.
Table 2: Transmit and Receive Pins
2.3
Pin
Name
Description
8
TX
3.3 V RS232 interface; Digi m10 to the host controller
7
RX
3.3 V RS232 interface; host controller to the Digi m10
Power and Ground
The Digi m10 is powered using five pins of its 14-pin connector (see Table 3). The five mounting
pins on the shield of the Digi m10 are also connected to the ground plane of the Digi m10.
Table 3: Power Pins
2.4
Pin
Name
Description
1
VCC
Supply
2
GND
Ground
3
VCC
Supply
4
GND
Ground
6
GND
Ground
Power Enable
The Power Enable signal is used to turn the Digi m10 ON or OFF. It is an active high logic-level
signal. The power enable signal can be from 3V min to 18V max. This will help users who do not
want separate PWR_EN functionality as they can tie PWR_EN to the Digi m10 supply voltage.
However, in this condition, the Digi m10 will be always be powered ON (consuming receive
current) unless the user cuts OFF Digi m10 power. This signal has to be maintained at an active
high level in order to keep the Digi m10 ON.
Table 4: Power Enable Pin
Pin
Name
5
PWR_EN
Description
Digi m10 Power Enable
This line is pulled low using a 47KΩ resistor.
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2.4.1
Powering Up
To power on the Digi m10, the host controller must provide an input voltage between 9 V and 18
V DC and then set the PWR_EN pin to active high. Typically, the Digi m10 will take two seconds
to be in a ready state. After powering on, the Digi m10 will toggle the DA pin once to let the host
controller know that it is ready to receive serial commands.
After the DA pin's initial toggle, its subsequent active high state indicates messages from the
satellite that are available in the Digi m10's inbound (IB) queue. The Digi m10's timing diagram for
powering up is shown in Figure 4.
Figure 4: Timing Diagram for Powering Up
The delay between PWR_EN going high with respect to VCC going high is not critical. Digi
International recommends a 10 milliseconds delay.
2.4.2
Powering Down
The host controller can power down the m10 by setting the PWR_EN pin to LOW. The host
controller can leave the supply voltage for Digi m10 ON, or remove it at its discretion. If the supply
is left ON with PWR_EN set to low, the Digi m10 will be powered down. However, it will consume
a leakage current of less than 3 µA. The timing diagram of the Digi m10's power down sequence
is shown in Figure 5.
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Figure 5: Timing Diagram for Powering Down
It is the responsibility of the host controller to back up all messages, reports,
GlobalGrams, etc. before powering down the Digi m10.
2.5
DA (Data Available)
The Data Available signal is an active high signal. It is normally low and is driven high when the
Digi m10 receives messages, user commands, or Global Grams from the satellite. The signal
goes low only after the host controller has cleared the outbound (OB) queue. The Digi m10's
timing diagram for DA is shown in Figure 6.
Table 5: DA Pin
Pin
Name
10
DA
Description
Data Available
Figure 6: Timing Diagram for Data Available
2.6
SA (Satellite Available)
The Satellite Available is an active high signal. It is normally low and is set to high when the Digi
m10 is receiving valid downlink signals. The Digi m10's timing diagram for SA is shown in Figure
7.
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Table 6: SA Pin
Pin
9
Name Description
SA
Satellite Available
Figure 7: Timing Diagram for Satellite Available
2.7
RF Interface
The RF connector for the Digi m10 (see Figure 8) is an MMCX plug, with an impedance of 50 Ω
nominal. Refer to Table 7 for details.
Figure 8: RF Connector on the Digi m10
Table 7: RF Interface Details
Parameter
Value
Transmit Power
5 W (37 + / -1 dBm)
TX Frequency
148 MHz to 150.05 MHz
RX Frequency
137 MHz to 138 MHz
VSWR
< 2:1 preferred
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Parameter
Value
Sensitivity
≥ -119 dBm
Dynamic Range
40 dB
Antenna Gain
≥ 0 dBi, in at least one direction
Antenna Impedance
50 Ω nominal
The Digi m10 is protected from VSWR failure. However, for best performance, Digi
International recommends using an antenna with good VSWR readings (see Table 7) at
both the RX and TX frequencies.
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3. Technical Specifications
This chapter describes the environmental, electrical, and mechanical specifications of the Digi
m10.
3.1
Environmental
The Digi m10 conforms to the relevant sections of the following documents:
1. ORBCOMM Subscriber Communicator (SC) Standards and Specifications
2. SAE J1455 Joint SAE / TMC Recommended Environmental Practices for Electronic
Equipment Design (Heavy-Duty Trucks)
3. FCC Part 2 and Part 25
4. CE mark (EC directive- 95 / 5 / EC) 0.
3.1.1
Electromagnetic Compatibility
3.1.1.1 Radiated Emissions
The Digi m10 conforms to Section 4.1 Radiated Emissions of the ORBCOMM Subscriber
Communicator (SC) Standards and Specifications document for emission within and outside
the 148.000 to 150.050 MHz band. Refer to EN 3200 721 for details.
3.1.1.2 Conducted Emissions
The RF connector on the Digi m10 complies with the test methodology and test levels for
conducted emissions defined in EN 300 832. Refer to Section 4.3 Conducted Emissions of
the ORBCOMM Subscriber Communicator (SC) Standards and Specifications document.
3.1.1.3 Radiated Immunity
The Digi m10 complies with the test methodology and test levels for radiated immunity,
defined in EN 300 832 (i.e. 80MHz – 1000MHz at 3V/m.) Refer to Section 4.2 Radiated
Immunity of the ORBCOMM Subscriber Communicator (SC) Standards and Specifications
document.
The Digi m10 also complies with the test methodology defined in IEC 1000-4-6 for radiated
immunity at the following test levels:
 1 V for 10 - 150 KHz
 10 V for 0.15 - 2.0 MHz
 10 V for 2 - 80 MHz
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3.1.1.4 Conducted Immunity
The RF connector on the Digi m10 complies with the test methodology and test levels for
conducted immunity defined in EN 300 832. (Refer to Section 4.4 Conducted Immunity of the
ORBCOMM Subscriber Communicator (SC) Standards and Specifications document.
3.1.1.5 Electrostatic Discharge
The RF connector on the Digi m10 has protection against electrostatic discharge (ESD)
events of 8 kV contact discharge and 15 kV air discharge with the Human Body Model. The
RF connector also complies with the test methodology and test levels at the RF pin defined in
EN 300 832.
3.1.2
RoHS
The Digi m10 complies with the European Union’s directive 2002 / 95 / EC, Restriction of
Hazardous Substances in Electrical and Electronic Equipments (RoHS), and similar regulations
that may be adopted by other countries. The RoHS directive restricts lead, mercury, cadmium,
hexavalent chromium, polybrominated biphenyis (PBBs), and polybrominated biphenyl ethers
(PBDEs) in electrical and electronics equipment, except for certain maximum concentration levels
in homogeneous materials.
This specification applies to all materials, parts, components, and / or products used in the Digi
m10.
3.1.3
Operating Temperature
The Digi m10 operates from -40 °F to +185 °F (-40 °C to +85 °C). The lower temperature limit has
been verified in accordance with MIL-STD-810E, Method 502.3, Procedure II, 4-hour test
duration. The upper temperature limit has been verified in accordance with MIL-STD-810E,
Method 501.3, Procedure II, 3-diurnal-cycle test duration. Refer to Sections 3.2 High Temperature
and 3.3 Low Temperature of the ORBCOMM Subscriber Communicator Standards and
Specifications for the temperature limits and verification methodology.
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The Digi m10 has been designed and tested to operate under the conditions shown in Table 8.
Table 8: Operating Conditions
Operating Temperature
Humidity Cycle
Comments
-40 °F to +185 °F (-40 °C to
+85 °C)
70% relative humidity (RH) –
40% moisture by volume
For 24 hours with a 12 V
supply
3.1.4
Storage Temperature
The Digi m10 can be stored for extended periods from -40 °F to +185 °F (-40 °C to +85 °C). It has
been subjected to the upper and lower temperature limits for 24 hours each and then checked for
stability.
3.1.5
Operational Shock
The Digi m10 remains structurally intact and operational after the drop test (as defined in
SAEJ1455) from 1.22 m onto each of its corners and its face.
The Digi m10 also meets the MIL-STD-810E, Method 516.4, Procedure I as defined in the
ORBCOMM Subscriber Communicator (SC) Standards and Specifications.
3.1.6
Operational Vibration
The Digi m10 meets the MIL-STD-810E, Method 514.4 and ETSI 300 721 as defined in the
ORBCOMM Subscriber Communicator (SC) Standards and Specifications.
In addition, the Digi m10 has also been tested according to SAEJ1455 (as per the practices for
heavy duty trucks), which specifies that the vibration profile for CAB-mounted vibration PSD for
Vertical Axis (Figure 6, 1.04 g rms) is to be tested in three mutually perpendicular planes and that
a sweep rate of ½ octave per minute is to be used.
3.2
Electrical
This section describes the electrical specification of the Digi m10. Many of the requirements listed
below refer to the ORBCOMM Subscriber Communicator (SC) Standards and Specifications
document.
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3.2.1
Power Design
3.2.1.1 Power Supply
The Digi m10 operates on a single unregulated power source of 9 V to 18 V DC (nominal 12
V) supplied through the pins of the host connector. The Power ON / OFF control circuit is
outside the Digi m10 and is controlled by host controller.
 Low: OFF state
 High: ON state
The Digi m10 does not have reverse polarity protection. Therefore, ensure that only
positive voltage is supplied to avoid damaging it.
3.2.1.2 Typical Power Consumption
The typical current consumption is as follows:
 Transmitting: ~1.5A at 12V nominal input power, when the RF Module is
transmitting at 5 W output power.
 Receiving: 70mA to 80mA at 12Vnominal input power when searching for or
continuously receiving the satellite signal.
 Powering-down: <3 μA at 12 V when the Digi m10 is in the OFF state.
The input supply for the Digi m10 should be in the range of 9 V to 18 V and the input supply
should be able to source up to 2 A.
The Digi m10 does not need a constant 2 A current. Instead, 2 A will be consumed as
pulsed current when the RF transmit is in progress. The power supply must be able to
source 2 A instantaneously (<100 µs), otherwise communications will fail. m10 supply
voltage ripple should be maintained below 0.3V and supply trace resistance below
0.15ohms.
The transmitter ON time can vary from 3.3 milliseconds to 4.8 seconds respectively.
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3.2.2
Digital Input / Output Specifications
The output pins can source / sink up to 10mA. For higher currents, the outputs must be buffered.
Table 9: Digital I/O Electrical Specifications
Parameter
Min (V)
Max (V)
VInput Low
0
0.8
Not applicable (NA)
VInput High
2.0
3.3
NA
VOutput Low
0
0.4
2 mA
VOutput High
2.4
3.3
2 mA
3.2.3
Maximum Recommended Load
Lifespan
3.2.3.1 Design
Each major component has a product roadmap of pin-compatible replacements for a
minimum of 3 years.
3.2.3.2 Failure Rate
The Digi m10 has a Mean Time between Failure (MTBF) of at least 43,800 hours with a
transmitter duty cycle of 0.05% and receiver duty cycle of 99.95% over the entire period.
Refer to Section 2.2.9 Reliability of the ORBCOMM Subscriber Communicator (SC)
Standards and Specifications.
3.3
Mechanical
This section describes the mechanical specification of the Digi m10.
3.3.1
Module Size
The Digi m10 (see Figure 9 has a maximum footprint of 2.96" x 1.81" x 0.52" (75.30 mm x 46.20
mm x 13.35 mm) with all the RFI covers in place.
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Figure 9: Digi m10 Dimensions
3.3.2
Mounting
The Digi m10 can be mounted directly to the host PCB using a board-to-board connector. The
Digi m10 has five solder legs, which must be soldered to the host controller’s common ground
reference plane. The host controller’s PCB needs to have five mounting holes to accommodate
the Digi m10.
The ground reference planes for the Digi m10’s connector and solder legs should be the
same as they are connected together within Digi m10
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4. Approvals and Certifications
The Digi m10 satellite modem carries the following certifications and regulatory approvals and
certifications:
 FCC
 CE Mark
 C-Tick (Australia/New Zealand)
 ORBCOMM Type Approval
 SAE
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5. Using the Digi m10
This chapter describes the details regarding the functioning of the Digi m10.
5.1
Interfacing with the Digi m10
Figure 10 illustrates how the host controller can be interfaced with the Digi m10.
Figure 10: Interface Between the Host Controller and the Digi m10
If Digi m10 is being used, then the UART signals are at TTL levels.
5.2
The Digi m10 JumpStart Kit
The development board (see Figure 11) provides users with an easy way to evaluate the Digi m10.
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Figure 11: Layout of the Development Board
The different components of the development board are as follows:
 SW1: This switch is used to power ON the JumpStart kit, which is indicated by the glowing of red LEDs
(Digi m10 POWER ENABLE).
 Power Jack: A 9 - 18 V supply can be fed through this jack.
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 Diagnostic Port: The Digi m10’s diagnostics can be accessed through this port using a terminal
emulation program. the interface is at RS-232 levels. Amber LEDs next to this port indicate that it is
active.
 Host Port (RS232): Users can send ORBCOMM serial commands to the Digi m10 at RS-232 levels using
this port. Amber LEDs next to this port indicate that it is active.
 Host Port (TTL): Users can send ORBCOMM serial commands to the Digi m10 at TTL levels using this
port.
 USB Port: Users can send ORBCOMM serial commands to the Digi m10 using this port.
 Signal Rail (TTL): This is a pin- to-pin mapping of the Digi m10 interface connector.
 Data Available: This blue LED illuminates when the Digi m10 receives messages, user commands, or
Global Grams from the satellite. It will also be asserted and de-asserted once after power on, when the
Digi m10 is ready to accept commands. Refer to Section 2.5 for further details.
 Satellite Available: This green LED illuminates when the Digi m10 is receiving valid downlink signals.
Refer to Section 2.6 for further details.
Only one of the Host port serial interfaces on the development board should be connected at a time.
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6. Antenna Information
1. Which antenna should be used with the Digi m10?
Please refer to ORBCOMM Application Note #12, which can be downloaded from
http://www.orbcomm.com/equipment/pdf/App_Note_12__ORBCOMM_Antennas.pdf. It provides details
and comparisons of antennas from different vendors.
2. If the antenna cable is not long enough to reach my installation, how do I pick a suitable RF cable
to each it?
You can use any 50 Ω impedance, RF coax cable, provided the overall loss from the antenna to the Digi
m10 is less than 3 dB at 150 MHz. The lower the cable loss, the costlier the cable, so there is a trade off
between price and performance. LMR-400 would be an ideal choice for a 100 feet long cable. LMR-195 is
an excellent choice for shorter lengths.
3. What should I consider when I mount my antenna?
The antenna should be kept away from metal objects and the objects should not be parallel to the
antenna, as this will degrade the performance of the antenna. If a VSWR meter is available, measure the
VSWR of the antenna at 137.5 MHz and 149 MHz. A VSWR reading below 2 is required for good
performance from the antenna.
Digi International, Inc. © 2009
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Digi m10 Hardware Reference v 1.20
Appendix A: Digi m10 Mechanical Drawings
Figure 12: Digi m10 Mechanical Drawing
Figure 13: Digi m10 Mechanical Drawing: Part A
Digi International, Inc. © 2009
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Digi m10 Hardware Reference v 1.20:
Figure 14: Digi m10 Mechanical Drawing: Part B
Digi International, Inc. © 2009
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Digi m10 Hardware Reference v 1.20
Figure 15: Digi m10 Mechanical Drawing: Part C
Digi International, Inc. © 2009
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Digi m10 Hardware Reference v 1.20:
Figure 16: Digi m10 Mechanical Drawing: Part D
Digi International, Inc. © 2009
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Digi m10 Hardware Reference v 1.20
Appendix B: Development Board Mechanical
Drawings
Digi International, Inc. © 2009
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Digi m10 Hardware Reference v 1.20:
Appendix C: : Digi m10 Development Board
Schematic
Figure 17: Development Board Schematic
Digi International, Inc. © 2009
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Digi m10 Hardware Reference v 1.20
Figure 18: Development Board Schematic (Part A)
Figure 19: Development Board Schematic (Part B)
Figure 20: Development Board Schematic (Part C)
Digi International, Inc. © 2009
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Digi m10 Hardware Reference v 1.20:
Figure 21: Development Board Schematic (Part D)
Digi International, Inc. © 2009
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Digi m10 Hardware Reference v 1.20
Digi International, Inc. © 2009
Page 36 of 36
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