Fox Thermal FT3 Посібник - Сторінка 6
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FT3 Modbus
FT3 Commands Supported by Modbus
FT3 Commands Supported
The FT3 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 FT3 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: FT3 Modbus Holding Registers
Register
Modbus
Address
Address
0x00
40001
0x01
40002
0x02
40003
0x03
40004
0x04
40005
0x05
40006
0x06
40007
0x07
40008
0x08
40009
6
Data Type
Flow in Eng units (low)
Flow in Eng units (high)
Total (low)
Total (High)
Temperature (low)
Temperature (high)
Elapsed time (low)
Elapsed time (high)
Velocity (Low)
Scaling
Comment
No
Mass flow in selected units
No
No
Total in selected units
No
*10
Temperature in selected units
* 10
*10
*10
Elapsed time in hours * 10
*10
No
Velocity in nm/hr