Fox Thermal FT2A, Руководство пользователя

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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 high> <CRC low>
Response:
<Meter Address> <Command code=03> <Byte count> <Data high><Data low> ... <Data
high><Data low> <CRC high> <CRC low>
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 high> <CRC low>
Where xx xx is the data register value.
Table 4.1: FT2A Modbus Holding Registers
Register
Address
Modbus
Address
Data Type Scaling Comment
0x00 40001 Flow in Eng units (low) No Mass flow in selected units
0x01 40002 Flow in Eng units (high) No
0x02 40003 Total (low) No Total in selected units
0x03 40004 Total (High) No
0x04 40005 Temperature (low) *10 Temperature in selected units
* 10
0x05 40006 Temperature (high) *10
0x06 40007 Elapsed time (low) *10 Elapsed time in hours * 10
0x07 40008 Elapsed time (high) *10
0x08 40009 Velocity (Low) No Velocity in nm/hr
Modbus/BACnet
6
FT2A Commands Supported by Modbus
MODBUS - F
T2A C
OMMANDS