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Fox Thermal FT2A, Manual

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Fox Thermal FT2A Manual Download Page 24

Aa

Modbus/BACnet

24

DEFINITIONS

Definitions

Glossary of Terms 

and Definitions

ADD 

  Address

ADU   

 

Application Data Unit

B-SS   

 

BACnet - Smart Sensor

BIBB   

 

BACnet Interoperability Building Blocks

COM 

  Communication

CRC   

 

Cyclic Redundancy Check   

NC 

  Not 

Connected

PC    

 

Personal Computer

PDU   

 

Protocol Data Units

NRT   

 

Non Resetting Totalizer

TERM   

 

Terminal

Summary of Contents for FT2A

Page 1: ...odel FT2A Modbus BACnet Fox Thermal THERMAL MASS FLOW METER TEMPERATURE TRANSMITTER Precision Mass Flow Measurement An ONICON Brand 105435 Rev D www foxthermal com 399 Reservation Road Marina CA 93933...

Page 2: ...Fox Thermal 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 informatio...

Page 3: ...e 4 3 RS485 Wiring for Modbus Page 5 4 FT2A Commands Supported by Modbus Page 6 5 Modbus Programming Page 12 6 BACnet Introduction Page 17 7 BACnet Protocol Page 16 8 RS485 Wiring for BACnet MS TP Pag...

Page 4: ...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 Dat...

Page 5: ...on 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 te...

Page 6: ...egister at starting address 0x0000 and specifying only 1 register 0x01 0x03 0x00 0x00 0x00 0x01 0x0a 0x84 Response 0x01 0x03 0x02 xx xx CRC high CRC low Where xx xx is the data register value Table 4...

Page 7: ...Elapsed time in hours float upper 16 bits No Elapsed time in hours 0x1C 40029 Elapsed time in hours float lower 16 bits No Elapsed time in hours 0x1D 40030 Velocity in selected units float upper 16 bi...

Page 8: ...h register No Tot24hrs Last Total 0x38 40057 Reserved No 0x39 40058 Reserved No 0x3A 40059 Reserved No 0x3B 40060 Reserved No 0x3C 40061 Reserved No 0x3D 40062 Reserved No 0x3E 40063 Reserved No 0x3F...

Page 9: ...le 2 Flow rate reached low limit threshold Set limit to zero to disable 3 Temperature reached high limit threshold Set limit to zero to disable 4 Temperature reached low limit threshold Set limit to z...

Page 10: ...ister 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...

Page 11: ...al over a shorter period 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 no...

Page 12: ...er 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 s...

Page 13: ...eNet Baud 9600 NXT OK Parity EVEN NXT OK Address 02 CHG OK Modbus only 1200 2400 4800 9600 NONE ODD EVEN 01 247 Enter menu by scolling to display 4 and entering the password 19200 38400 57600 76800 11...

Page 14: ...dbus 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 F1 F2 F3 F4 P...

Page 15: ...n press OK F4 to accept the setting Selections are NONE ODD EVEN 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...

Page 16: ...ies 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 inter...

Page 17: ...C 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 Therma...

Page 18: ...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 terminat...

Page 19: ...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 sec...

Page 20: ...ord Comm BACnet NXT OK Baud 9600 NXT OK MAC_ADD 23 CHG OK MAX_MASTER 127 CHG OK BACnet only 9600 19200 38400 57600 76800 115200 0 127 01 127 ID 12531 CHG OK 0 4194303 NAME FT2A_FLOW CHG OK BACnet Prog...

Page 21: ...ed as shown and then press OK F4 to accept the setting 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 384...

Page 22: ...nstance Selection is from 0 4194303 F1 F2 F3 F4 Next enter the device object name 9 characters maximum F1 F2 F3 F4 i Note Power cycle is required for the new settings to take effect MAC_ADD 23 CHG OK...

Page 23: ...Modbus BACnet 23...

Page 24: ...finitions ADD Address ADU Application Data Unit B SS BACnet Smart Sensor BIBB BACnet Interoperability Building Blocks COM Communication CRC Cyclic Redundancy Check NC Not Connected PC Personal Compute...

Page 25: ...nds 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 BACnet p 21 Menu Tree p 13 p 20 M...

Page 26: ...i Caution Wiring Definition of Terms Information Aa...

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