FT2A Modbus BACnet Manual Rev B

Fox Thermal Instruments, Inc.

THERMAL MASS FLOW METER & TEMPERATURE TRANSMITTER

Model FT2A

Modbus & BACnet MS/TP

www.foxthermalinstruments.com | 399 Reservation Road Marina, CA. 93933

105435

Rev. B

Modbus/BACnet

Notice

This publication must be read in its entirety before performing any operation. Failure to understand and follow these instructions could result in serious personal injury and/or damage to the equipment. Should this equipment require repair or adjustment beyond the procedures given herein, contact the factory at:

FOX THERMAL INSTRUMENTS, INC.

399 RESERVATION ROAD

MARINA, CA 93933

TELEPHONE: 831-384-4300

FAX: 831-337-5787

EMAIL: [email protected]

Download Technical Data Sheets from our website: www.foxthermalinstruments.com

Fox Thermal Instruments believes that the information provided herein is accurate however be advised that the information contained herein is NOT a guarantee for satisfactory results. Specifically, this information is neither a warranty nor guarantee, expressed or implied, regarding performance; merchantability; fitness; or any other matter with respect to the products; nor recommendation for the use of the product/process information in conflict with any patent. Please note that Fox

Thermal Instruments, Inc. reserves the right to change and/or improve the product design and specification without notice.

Fox FT2A Manuals:

• Model FT2A Instruction Manual

• Fox FT2A View™ Instruction Manual

• Fox FT2A Profibus, DeviceNet & Ethernet Manual

2

Table Of Contents

1. Modbus Introduction

2. Modbus Protocol

3. RS485 Wiring for Modbus

4. FT2A Commands Supported by Modbus

5. Modbus Programming

6. BACnet Introduction

7. BACnet Protocol

8. RS485 Wiring for BACnet MS/TP

9. BACnet Programming

10. Glossary of Terms and Abbreviations

11. Index

Page 17

Page 17

Page 19

Page 20

Page 24

Page 25

Modbus/BACnet

Page 4

Page 4

Page 5

Page 6

Page 13

3

4

Modbus

Modbus Introduction

Scope

Modbus

Introduction

Scope

Thank you for purchasing the Model FT2A Thermal Gas Mass Flow meter and

Temperature Transmitter from Fox Thermal Instruments. The Model FT2A is one of the most technically advanced flow meters in the world. Extensive engineering effort has been invested to deliver advanced features, accuracy measurement performance and outstanding reliability.

Modbus Protocol

i

This document describes the Modbus implementation using RS485 serial communication physical layer for the Fox Thermal Instruments FT2A Mass flow meter.

Modbus Protocol

MODBUS Protocol is an application layer messaging protocol that provides client/sever communications between devices. MODBUS is a request/reply protocol and offers services specified by function codes.

The size of the MODBUS Protocol Data Unit is limited by the size constraint inherited from the first MODBUS implementation on Serial Line network (max.

RS485 Application Data Unit = 256 bytes).

Therefore, MODBUS PDU for serial line communication = 256 – Server address (1 byte) – CRC (2 bytes) = 253 bytes.

RS485 ADU = 253 + Server address (1 byte) + CRC (2 bytes) = 256 bytes.

For more information on MODBUS go to the web site http://www.modbus.org/.

Command Request:

<Meter Address> <Function code> <Register start address high>

<Register start address low> <Register count high> <Register count low> <CRC low> <CRC high>

Command Response:

<Meter Address> <Function code> <Data byte count> <Data register low> <Data register high> ... <Data register low> <Data register high> <CRC low> <CRC high>

Note: The data in shown in brackets < > represents one byte of data.

www.foxthermalinstruments.com

Modbus

RS485 Wiring: Modbus

RS485 Wiring

RS485 Wiring for Modbus

Wiring connections are made to terminal block TS2 for Modbus communication.

The Tx/Rx+ signal connects to pin 7, Tx/Rx- connects to pin 8 and communication common to pin 9 as shown in Figure 3.1.

Termination Resistor

Connect a termination resistor across the receive/transmit signals of the last device on the Modbus communication line. To connect the 121 ohm termination resistor on the FT2A, set jumper W1 to the TERM position.

Disconnect the termination resistor on all other external Modbus devices. The termination resistor of the FT2A is disconnected by setting jumper W1 to the

NC (Not Connected) position.

Fig. 3.1: Modbus Wiring

3

4

5

1

2

TS8

TS7 1 2 3 1 2 3 TS1

Tx/Rx (+)

Tx/Rx (-)

Communication Common

TS2

8

9

6

7

10

11

2

3

4

5

Pin 1 of termination resistor header W1

W1

}

}

NC (Termination resistor Not Connected)

TERM (Termination resistor installed) i

Note: W1 jumper will either be in the NC or TERM position. It should be in the

TERM position on the last meter in the Modbus daisy chain.

5

Modbus

FT2A Commands Supported by Modbus

FT2A Commands

Supported

FT2A Commands Supported

The FT2A supports the following commands:

1) Command 03: Read holding registers

2) Command 04: Read input register.

3) Command 06: Preset single register

Read Holding Registers (command 03)

This command reads the basic variable from the FT2A and has the following format:

Request:

<Meter Address> <Command code=03> <Register start address high> <Register start address low> <Register count high> <Register count low> <CRC low> <CRC high>

Response:

<Meter Address> <Command code=03> <Byte count> <Data high><Data low> ... <Data high><Data low> <CRC low> <CRC high>

Example:

Request data register at starting address 0x0000 and specifying only 1 register

<0x01> <0x03> <0x00> <0x00> <0x00> <0x01> <0x0a>

<0x84>

Response:

<0x01> <0x03> <0x02> <xx> <xx> <CRC low> <CRC high>

Where xx xx is the data register value.

Table 4.1: FT2A Modbus Holding Registers

Register

Address

0x00

0x01

0x02

Modbus

Address

40001

40002

40003

Data Type

Flow in Eng units (low)

Flow in Eng units (high)

Total (low)

Scaling Comment

Mass flow in selected units No

No

No Total in selected units

6

Modbus

FT2A Commands Supported by Modbus

Modbus

Address

40004

40019

40020

40021

40022

40023

40024

40025

40026

40027

40028

40029

40030

40031

40005

40006

40007

40008

40009

40010

40011

40012

40013

40014

40015

40016

40017

40018

40032

40033

40034

40035

40036

40037

40038

40039

Register

Address

0x03

0x12

0x13

0x14

0x15

0x16

0x17

0x18

0x19

0x1A

0x1B

0x1C

0x1D

0x1E

0x04

0x05

0x06

0x07

0x08

0x09

0x0A

0x0B

0x0C

0x0D

0x0E

0x0F

0x10

0x11

0x1F

0x20

0x21

0x22

0x23

0x24

0x25

0x26

Data Type

Total (High)

Temperature (low)

Temperature (high)

Elapsed time (low)

Elapsed time (high)

Velocity (Low)

Velocity (high)

Flow in Eng units * 10

Flow in Eng units *100

Total *100

Total2 (low, 2 gas curves only)

Total2 (high, 2 gas curves only)

Status

Spare/ Not used

Control Register (Write Only)

Spare/ Not used

Flow in Eng units (float, upper 16 bits)

Flow in Eng units (float, lower 16 bits)

Total in Eng units (float, upper 16 bits)

Total in Eng units (float, lower 16 bits)

Total#2 for 2 gas curve (float, upper 16 bits)

Total#2 for 2 gas curve (float, lower 16 bits)

Temperature in selected units (float, upper 16 bits)

Temperature in selected units (float, lower 16 bits)

Elapsed time in hours (float, upper 16 bits)

Elapsed time in hours (float, lower 16 bits)

Velocity in selected units (float, upper 16 bits)

Velocity in selected units (float, lower 16 bits)

Spare/ Not used

Spare/ Not used

Spare/ Not used

Spare/ Not used

Spare/ Not used

Total 24 hrs, Last total record, low register

Total 24 hrs, Last total record, high register

Total 24 hrs, Current Day (0-6)

Scaling Comment

No

*10 Temperature in selected units * 10

*10

*10 Elapsed time in hours * 10

*10

No Velocity in nm/hr

No

10 Mass flow in selected units * 10

100 Mass flow in selected units * 100

100 Total in selected units * 100

No Total #2 for 2 gas curves

No

No

Total #2 for 2 gas curves

Status

No Control Register

No

No

No

No

No

No

No

No

No

No

No

No

Mass flow in selected units

Mass flow in selected units

Total in selected units

Total in selected units

Total in selected units

Total in selected units

Temperature in selected units

Temperature in selected units

Elapsed time in hours

Elapsed time in hours

Velocity in selected units

Velocity in selected units

No

No

No

Tot24hrs: Last total record

Tot24hrs: Last total record

Tot24hrs: Current Day

7

Modbus

FT2A Commands Supported by Modbus

8

Register

Address

0x27

0x3F

0x40

0x41

0x42

0x43

0x44

0x37

0x38

0x39

0x3A

0x3B

0x3C

0x3D

0x3E

0x30

0x31

0x32

0x33

0x34

0x35

0x36

0x28

0x29

0x2A

0x2B

0x2C

0x2D

0x2E

0x2F

Modbus

Address

40040

40064

40065

40066

40067

40068

40069

40056

40057

40058

40059

40060

40061

40062

40063

40049

40050

40051

40052

40053

40054

40055

40041

40042

40043

40044

40045

40046

40047

40048

Data Type

Total 24 hrs, Current Hour (0-23)

Total 24 hrs, Record day 1, low register

Total 24 hrs, Record day 1, high register

Total 24 hrs, Record day 2, low register

Total 24 hrs, Record day 2, high register

Total 24 hrs, Record day 3, low register

Total 24 hrs, Record day 3, high register

Total 24 hrs, Record day 4, low register

Total 24 hrs, Record day 4, high register

Total 24 hrs, Record day 5, low register

Total 24 hrs, Record day 5, high register

Total 24 hrs, Record day 6, low register

Total 24 hrs, Record day 6, high register

Total 24 hrs, Record day 7, low register

Total 24 hrs, Record day 7, high register

Total 24 hrs, Last Total, low register

Total 24 hrs, Last Total, high register

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Reserved

Scaling Comment

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

No

Tot24hrs: Current Hour

Tot24hrs: Record day 1

Tot24hrs: Record day 1

Tot24hrs: Record day 2

Tot24hrs: Record day 2

Tot24hrs: Record day 3

Tot24hrs: Record day 3

Tot24hrs: Record day 4

Tot24hrs: Record day 4

Tot24hrs: Record day 5

Tot24hrs: Record day 5

Tot24hrs: Record day 6

Tot24hrs: Record day 6

Tot24hrs: Record day 7

Tot24hrs: Record day 7

Tot24hrs: Last Total

Tot24hrs: Last Total

* The data in registers with scaling must be multiplied by 10 or 100 as indicated to be scaled properly. i

Note: Registers A, B & C are provided to get more resolution for low flow and total. When value exceeds the 16 bit registers, they will be frozen with all 16 bits set. It is also possible to use the velocity to calculate the flow in engineering units by using the pipe area and conversion factor for the selected units.

Modbus

FT2A Commands Supported by Modbus

Bit

0

5

6

3

4

1

2

7

8

9

10

11

12

13

14

15

Read Input Register

Read Input Register (FT2A Status, Command 04)

This command is used to report the FT2A status information. It is a READ

ONLY command.

Request:

<Meter Address> <Command code=04> <Register address =0>

<Register address =0> <Register count =0> <Register count =1>

<CRC low> <CRC high>

Response:

<Meter Address> <Command code=04> <Byte count =2> <Status

High><Status Low> <CRC low> <CRC high>

Table 4.2: Status Bits Definitions for Command 04, Modbus Address 30001

Definition

Power up indication

Flow rate reached high limit threshold

Flow rate reached low limit threshold

Temperature reached high limit threshold

Temperature reached low limit threshold

Sensor reading is out of range

Velocity flow rate outside of calibration table

Incorrect Settings

In simulation mode

Frequency output is out of range

Analog 4-20 mA for flow is out of range

Analog 4-20 mA for temperature is out of range

Anybus error

Bridge Shut Down

CRC error

Error in Total

Comment

Cleared when out of the power up sequence

Set limit to zero to disable

Set limit to zero to disable

Set limit to zero to disable

Set limit to zero to disable

Check sensor wiring

Check sensor wiring

Check settings

Set simulation value to 0 to disable

Check frequency output settings

Check analog output settings

Check analog output settings

Replace display board

Check sensor wiring

Check parameters and reset CRC

Reset total to clear alarm

9

Modbus

FT2A Commands Supported by Modbus

5

6

3

4

1

2

Bit

0

Model FT2

Table 4.3: Status 2 Bits Definitions for Command 04, Modbus Address 30002

Definition

Not used

Busy

Not used

Curve #2 Selected (for 2 gas curves only)

Not used

Not used

Not used

Comment

Not used

Busy

Not used

Curve #2 Selected (for 2 gas curves only)

Not used

Not used

Not used

10

Modbus

FT2A Commands Supported by Modbus

Preset Single

Register

Preset Single Register (Command 06)

This command is used to perform miscellaneous functions such as clearing the totalizer and elapsed time. The register address is Modbus=40018 and the data to write is described below.

Request:

<Meter Address> <Command code=06> <Register address high=0x00> <Register address low=0x11> <Register data high=0x00> <Register data low =0x02> <CRC low> <CRC high>

Response:

<Meter Address> <Command code=06> <Register address =0x00>

<Register address =0x11> <Register data=0x00> <Register data

=0x02> <CRC low> <CRC high>

Reset Total:

Address = 40018, data = 0x02

This command is used to clear the Totalizer and elapsed time registers

Reset 24 hours Total:

Address=40018, data = 180 (0xB4)

This command reset the 24 hours 7 days record including the day and hours counters

Reset 24 hour time:

Address=40018, data = 181 (0xB5)

This command reset the 24 hours day and hours counters

24 hours Event:

Address=40018, data = 182 (0xB6)

This command generates a 24 hours event, the same way as when the 24 hours counter rolls over.

This may be useful to record total over a shorter period.

11

Modbus

FT2A Commands Supported by Modbus

Preset Single

Register

Switch to Curve #1:

Address=40018, data = 170 (0xAA)

This command initiates a command to switch to gas curve 1 when configured for 2 gas curves.

Make sure that the input contact is not programmed for curve switching

Switch to Curve #2:

Address=40018, data = 171 (0xAB)

This command initiates a command to switch to gas curve 2 when configured for 2 gas curves.

Make sure that the input contact is not programmed for curve switching

Programming

12

Modbus

Modbus Programming

Programming

Enter the Programming Mode

Press the F1 or the F2 key repeatedly, in the normal running mode, until the following screen is shown. This enters the programming mode:

SET PARAMETERS?

NO YES

F1 F2 F3 F4

Press YES (F4) and then the following screen will prompt the user to enter the password if enabled:

PASWD:_

UP DN NXT OK

F1 F2 F3 F4

Enter the correct password. Default password for Level 1 is 1234.

Press the UP (F1) or DN (F2) key to select a new digit or character, the cursor points to the selected digit. Press NXT (F3) to select the next digit and OK (F4) to accept the entry.

If the wrong password is entered, the message “Wrong Password” will be displayed for a few seconds and then return to the programming entry screen.

If the password is accepted, the following screen will be shown:

SET PARAMETERS?

I/O FLO DSP EXIT

F1 F2 F3 F4

This is the base screen for the programming mode. To exit the programming mode, press EXIT (F4) repeatedly until “Normal Mode” is seen briefly.

13

Modbus

Modbus Programming

Menu Tree

Fig. 5.1: Menu Tree: Comm Selection and Programming

Enter menu by scolling to display 4 and entering the password

SET PARAMETERS

I/O FLO DSP EXIT

SET I/O

COM I/O 420 EXIT

None

Modbus

BACnet

Ethernet

Profibus

DeviceNet

Comm=Modbus

NXT OK

1200

2400

4800

9600

19200

38400

57600

76800

115200

Baud=9600

NXT OK

NONE

ODD

EVEN

Parity=EVEN

NXT OK

01-247

Address=02

CHG OK

Modbus only

14

Modbus

Modbus Programming

Modbus

Communication

Parameters

Communication Protocol and Parameters

To program the communication parameters, press I/O (F1) key from the base menu.

SET I/O

I/O FEQ 420 EXIT

F1 F2 F3 F4

Then press I/O (F1) again:

SET I/O

COM CTC EXIT

F1 F2 F3 F4

Then press COM (F1) to select communication parameters.

Set Bus protocol for Modbus:

Bus=Modbus

NXT OK

F1 F2 F3 F4

Press NXT (F1) repeatedly until Modbus is selected as shown and then press

OK (F4) to accept the setting.

The following communication parameters are only available for MODBUS:

Baud=9600

NXT OK

F1 F2 F3 F4

Press NXT (F1) repeatedly until the correct selection is shown and then press

OK (F4) to accept the setting.

Selections are: "115200"

"76800"

15

16

Modbus

Modbus Programming

Modbus

Communication

Parameters

“4800”

"57600"

"38400"

“19200”

“9600”

“2400”

“1200”

Parity=EVEN

NXT OK

F1 F2 F3 F4 i

Press NXT (F1) repeatedly until the correct selection is shown and then press

OK (F4) to accept the setting.

Selections are: “NONE”

“ODD”

“EVEN”

Address=02

CHG OK

F1 F2 F3 F4

Press CHG (F1) to change the address and then press OK (F4) to accept the setting.

Selections are between 01 and 247.

Note: Power cycle is required for the new settings to take effect.

BACnet Introduction

BACnet

BACnet Introduction

BACnet Introduction

Scope

Thank you for purchasing the Model FT2A Thermal Gas Mass Flow meter and

Temperature Transmitter from Fox Thermal Instruments. The Model FT2A is one of the most technically advanced flow meters in the world. Extensive engineering effort has been invested to deliver advanced features, accuracy measurement performance and outstanding reliability.

BACnet Protocol

This document describes the BACnet MS/TP implementation using RS485 serial communication physical layer for the Fox Thermal Instruments FT2A

Mass flow meter.

BACnet Protocol

BACnet MS/TP (Building Automation and Control Network /Master Slave Token

Passing) is a data link layer protocol designed for communication between devices in building automation control systems. The protocol is based on devices, objects, properties, and services. Information inside a BACnet device is organized into a series of objects. Properties allow the data from the object to be written or read. The actions that a BACnet device uses to interact with another device are the services.

The FT2A Device profile: BACnet Smart Sensor (B-SS)

FT2A supports the following device binding methods:

Receive Who-Is, send I-Am (BIBB DM-DDB-B)

Receive Who-Has, send I-Have (BIBB DM-DOB-B)

Objects for FT2A:

Analog Input 1 = Flow

Analog Input 2 = Gas Temperature

Analog Input 3 = Total Flow / Reset Total

Analog Input 4 = Elapsed Time since reset

17

BACnet Protocol

BACnet Protocol

Device object property identifiers and restrictions: (properties that are writable)

Object _Name

Object _ Identifier

< 10 bytes

Device Type only

Max _ info_ Frames <=255

Max _ Master <=127

BACnet Interoperability Building Blocks (BIBB’S) provide function capabilities for data exchange between devices.

FT2A BIBB’s supported:

DS-RP-B Read Property

DS-WP-B Write Property

DM-DDB-B Dynamic Device Binding

DM-DOB-B Dynamic Object Binding

DM-DCC-B Device Communication Control

DS-RPM-B ReadPropertyMultiple

DM-RD-B Reinitialize Device

MS/TP baud rates:

9600, 19200, 38400, 57600, 76800, 115200

FT2A Character sets supported:

ANSI X3.4, UTF-8

Fox Thermal Instruments BACnet vendor ID: 650

For more information about BACnet visit http://www.bacnet.org/.

BACnet

RS485 Wiring: BACnet MS/TP

RS485 Wiring

RS485 Wiring: BACnet MS/TP

Wiring connections are made to terminal block TS2 for BACnet MS/TP communication.

The Tx/Rx+ signal connects to pin 7, Tx/Rx- connects to pin 8 and communication common to pin 9 as shown in Figure 8.1.

Termination Resistor

Connect a termination resistor across the receive/transmit signals of the last device on the BACnet MS/TP communication line. To connect the 121 ohm termination resistor on the FT2A, set jumper W1 to the TERM position.

Disconnect the termination resistor on all other external BACnet MS/TP devices. The termination resistor of the FT2A is disconnected by setting jumper W1 to the NC (Not Connected) position.

Fig. 8.1: BACnet MS/TP Wiring

3

4

5

1

2

TS8

TS7 1 2 3 1 2 3 TS1

Tx/Rx (+)

Tx/Rx (-)

Communication Common

TS2

8

9

6

7

10

11

2

3

4

5

Pin 1 of termination resistor header W1

W1

}

}

NC (Termination resistor Not Connected)

TERM (Termination resistor installed) i

Note: W1 jumper will either be in the NC or TERM position. It should be in the

TERM position on the last meter in the BACnet MS/TP daisy chain.

19

BACnet

BACnet Programming

BACnet

Programming

Enter the Programming Mode

Press the F1 or the F2 key repeatedly, in the normal running mode, until the following screen is shown. This enters the programming mode:

SET PARAMETERS?

NO YES

F1 F2 F3 F4

Press YES (F4) and then the following screen will prompt the user to enter the password if enabled:

PASWD:_

UP DN NXT OK

F1 F2 F3 F4

Enter the correct password. Default password for Level 1 is 1234.

Press the UP (F1) or DN (F2) key to select a new digit or character, the cursor points to the selected digit. Press NXT (F3) to select the next digit and OK (F4) to accept the entry.

If the wrong password is entered, the message “Wrong Password” will be displayed for a few seconds and then return to the programming entry screen.

If the password is accepted, the following screen will be shown:

SET PARAMETERS?

I/O FLO DSP EXIT

F1 F2 F3 F4

This is the base screen for the programming mode. To exit the programming mode, press EXIT (F4) repeatedly until “Normal Mode” is seen briefly.

20

BACnet Programming

Menu Tree

Fig. 9.1: Menu Tree: Comm Selection and Programming

Enter menu by scolling to display 4 and entering the password

SET PARAMETERS

I/O FLO DSP EXIT

SET I/O

COM I/O 420 EXIT

Comm=BACnet

NXT OK

9600

19200

38400

57600

76800

115200

Baud=9600

NXT OK

0-127

MAC_ADD=23

CHG OK

01-127

MAX_MASTER=127

CHG OK

BACnet only

0-4194303

ID=12531

CHG OK

NAME=FT2A_FLOW

CHG OK

BACnet

21

BACnet

BACnet Programming

BACnet

Communication

Parameters

Communication Protocol and Parameters

To program the communication parameters, press I/O (F1) key from the base menu.

SET I/O

I/O FEQ 420 EXIT

F1 F2 F3 F4

Then press I/O (F1) again:

SET I/O

COM CTC EXIT

F1 F2 F3 F4

Then press COM (F1) to select communication parameters

Set Bus protocol for BACnet:

Bus=BACnet

NXT OK

F1 F2 F3 F4

22

Press NXT (F1) repeatedly until BACnet is selected as shown and then press

OK (F4) to accept the setting.

Baud=9600

NXT OK

F1 F2 F3 F4

Press NXT (F1) repeatedly until the correct selection is shown and then press

OK (F4) to accept the setting.

Selections are: “9600”

“19200”

“38400”

“57600”

“76800”

“115200"

BACnet

BACnet Programming

BACnet

Communication

Parameters

Next select the MS/TP Mac address. The selection is from 0-127. Please note that only one device can be on a MS/TP Mac address.

MAC_ADD=23

CHG OK

F1 F2 F3 F4 i

Next select the MS/TP Max Master. The selection is from 0-127.

MAX_MASTER=127

CHG OK

F1 F2 F3 F4

Next input the device object instance. Selection is from 0-4194303.

ID=12531

CHG OK

F1 F2 F3 F4

Next enter the device object name (9 characters maximum).

NAME=FT2A_FLOW

CHG OK

F1 F2 F3 F4

Note: Power cycle is required for the new settings to take effect.

23

24

Modbus/BACnet

Definitions

Glossary of Terms and Definitions

Aa

ADD

ADU

B-SS

BIBB

COM

Application Data Unit

BACnet - Smart Sensor

BACnet Interoperability Building Blocks

Communication

CRC

NC

PC

PDU

NRT

TERM

Cyclic Redundancy Check

Connected

Personal Computer

Protocol Data Units

Non Resetting Totalizer

Terminal

Index

Index

BACnet

Modbus

Programming, p. 20

Protocol, p. 17

Wiring, p. 19

Programming

FT2A Commands Supported, p. 6

Preset Single Register, p. 11

Programming, p. 13

Protocol, p. 4

Read Holding Registers, p. 6

Read Input Registers, p. 9

Status Bits, p. 9

Wiring, p. 5

BACnet, p. 22

Menu Tree, p. 14; p. 21

Modbus, p. 15

RS485 Wiring

BACnet, p. 21

Modbus, p. 5

Termination Resistor, p. 5

Wiring,

BACnet, p. 21

Modbus, p. 5

Modbus/BACnet

25

i

Information

Caution

Wiring

Aa

Definition of Terms