Algodue ELETTRONICA UPM309 Manual Del Usuario página 91

Response example: 01000000000701030400000001
Example Byte Description
01 - Transaction ID
00 High
00 Low
Protocol ID
00 High
00 Low
07 - 7 data bytes
01 - Unit ID
03
- Function code
04 - 4 reading bytes
00 High
00 Low
3 phase, 4 wire, 3 current wiring mode
00 High
01 Low
MODBUS RTU/ASCII, TCP 91