ComAp Inteli Mains NTC BaseBox User Manual

Communication Guide, ©ComAp – March 2014 113
IGS-NT Communication Guide 03-2014.pdf
Read Multiple Registers
Query
Byte
Meaning
Note
0
Controller address
1 to 32
1
3
Modbus function code
2
3
Communication object number
- upper byte (MSB)
- lower byte (LSB)
See List of communication
objects
4
5
Communication object length expressed by the number of registers
- upper byte (MSB)
- lower byte (LSB)
Greater than 0
6
7
Check field CRC
- lower byte (LSB)
- upper byte (MSB)
See Check field calculation
Standard response
Byte
Meaning
Note
0
Controller address
Same as in the query
1
3
Same as in the query
Length of read data in bytes (L)
Number of registers  2
3
4
Data of the 1st register
- upper byte (MSB)
- lower byte (LSB)
5
6
Data of the 2nd register
- upper byte (MSB)
- lower byte (LSB)
…
L  1
L  2
Data of the last register
- upper byte (MSB)
- lower byte (LSB)
L  3
L  4
Check field CRC
- lower byte (LSB)
- upper byte (MSB)
See Check field calculation
Exceptional response
Byte
Meaning
Note
0
Controller address
Same as in the query
1
131
Modbus fun.number  128
2
2
See Error list
3
4
Check field CRC
- lower byte (LSB)
- upper byte (MSB)
See Check field calculation
Write Single Register
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)
See List of communication
objects
4
5
Data
- upper byte (MSB)
- lower byte (LSB)
6
7
Check field CRC
- lower byte (LSB)
- upper byte (MSB)
See Check field calculation
Standard response
Byte
Meaning
Note
0
Controller address
Same as in the query
1
6
Same as in the query

ComAp Inteli Mains NTC BaseBox Specifications

General

Brand	ComAp
Model	Inteli Mains NTC BaseBox
Category	Controller
Language	English