ComAp InteliSys NTC Basebox Communications Manual page 134

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