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Fox Thermal FT3 Manual

Thermal mass flow meter and temperature transmitter
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Fox Thermal
THERMAL MASS FLOW METER
& TEMPERATURE TRANSMITTER
Model FT3
Modbus
www.foxthermal.com | 399 Reservation Road Marina, CA. 93933
104985
Rev. D

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Summary of Contents for Fox Thermal FT3

  • Page 1 Fox Thermal THERMAL MASS FLOW METER & TEMPERATURE TRANSMITTER Model FT3 Modbus www.foxthermal.com | 399 Reservation Road Marina, CA. 93933 104985 Rev. D...
  • Page 2 Please note that Fox Thermal reserves the right to change and/or improve the product design and specification without notice. Fox FT3 Manuals: •...

  • Page 3: Table Of Contents

    1. Modbus Introduction Page 4 2. Modbus Protocol Page 4 3. RS485 Wiring for Modbus Page 5 4. FT3 Commands Supported by Modbus Page 6 5. Modbus Programming Page 12 10. Glossary of Terms and Abbreviations Page 16 11. Index...

  • Page 4: Modbus Introduction

    Thank you for purchasing the model FT3 thermal gas mass flow meter from Fox Thermal. The model FT3 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.

  • Page 5: Rs485 Wiring For Modbus

    Termination Resistor Connect a termination resistor across the receive/transmit signals of the last device on the RS485 communication line. To connect the 121 ohm termination resistor on the FT3, set JP1 to the TERM position. Disconnect the termination resistor on all other external RS485 devices. The termination resistor of the FT3 is disconnected by setting JP1 to the NC (Not Connected) position.

  • Page 6: Ft3 Commands Supported By Modbus

    Command 04: Read input register. Command 06: Preset single register Read Holding Registers (command 03) This command reads the basic variable from the FT3 and has the following format: Request: <Meter Address> <Command code=03> <Register start address high> <Register start address low>...
  • Page 7 FT3 Modbus FT3 Commands Supported by Modbus Register Modbus Data Type Scaling Comment Address Address 0x09 40010 Velocity (high) 0x0A 40011 Flow in Eng units * 10 Mass flow in selected units * 10 0x0B 40012 Flow in Eng units *100...
  • Page 8 FT3 Modbus FT3 Commands Supported by Modbus Register Modbus Data Type Scaling Comment Address Address 0x30 40049 Total 24 hrs, Record day 5, low register Tot24hrs: Record day 5 0x31 40050 Total 24 hrs, Record day 5, high register Tot24hrs: Record day 5...
  • Page 9 <Meter Address> <Command code=04> <Byte count =2> <Status High><Status Low> <CRC high> <CRC low> The FT3 supports only reading of the FT3 status. The register address must be set to zero (Modbus Address 30001) and the register count must be set to 1.
  • Page 10 FT3 Modbus FT3 Commands Supported by Modbus Table 4.3: Status 2 Bits Definitions for Command 04, Modbus Address 30002 Definition Comment CAL-V in progress CAL-V in progress ADC12<> ADC24 too far apart Internal ADC calibration out of range CAL-V Diff out of range...
  • Page 11 FT3 Modbus FT3 Commands Supported by Modbus 24 hours Event: Address=40011, 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.

  • Page 12: Modbus Programming

    FT3 Modbus Modbus 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? Press YES (F4) and then the following screen will prompt the user to enter the password if...
  • Page 13 FT3 Modbus Modbus Programming 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 Comm=Modbus Modbus HART 1200...
  • Page 14 FT3 Modbus Modbus Programming Communication Protocol and Parameters To program the communication parameters, press I/O (F1) key from the base menu. SET I/O EXIT Then press I/O (F1) again: SET I/O EXIT Then press COM (F1) to select communication parameters.
  • Page 15 It is very important that there are not two devices with the same Modbus address. To avoid conflicts, each Modbus slave must have a unique address. Range is from 01 and 247. Note: Power to the FT3 must be cycled off and on for the new Modbus settings to take effect.

  • Page 16: Glossary Of Terms And Abbreviations

    FT3 Modbus Definitions Glossary of Terms Address Application Data Unit and Definitions Communication Cyclic Redundancy Check Not Connected Personal Computer Protocol Data Units Non Resetting Totalizer TERM Terminal...

  • Page 17: Index

    FT3 Modbus Index Index Modbus FT3 Commands Supported, p. 6 Preset Single Register, p. 10 Programming, p. 12 Protocol, p. 4 Read Holding Registers, p. 6 Read Input Registers, p. 9 Status Bits, p. 9 Wiring, p. 5 Programming Menu Tree, p. 13 Modbus, p.
  • Page 18 Information Caution Wiring Definition of Terms...