IGS-NT Communication Guide
134
Write Single Registers
Query
Byte Meaning Note
0 Controller address 1 to 32
1 6 Modbus function code
2
3
Communication object number
upper byte (MSB)
lower byte (LSB)
4
5
Data
upper byte (MSB)
lower byte (LSB)
6
7
Check field CRC
lower byte (LSB)
upper byte (MSB)
see Check field calculation on page 143
Standard response
Byte Meaning Note
0 Controller address Same as in the query
1 6 Same as in the query
2
3
Communication object number
upper byte (MSB)
lower byte (LSB)
Same as in the query
4
5
Data
upper byte (MSB)
lower byte (LSB)
Same as in the query
6
7
Check field CRC
lower byte (LSB)
upper byte (MSB)
see Check field calculation on page 143
Exceptional response
Byte Meaning Note
0 Controller address Same as in the query
1 134 Function code + 128
2 2 see Error list on page 150
3
4
Check field CRC
lower byte (LSB)
upper byte (MSB)
see Check field calculation on page 143
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