ComAp InteliGen NT BaseBox User Manual

IGS-NT Communication Guide
136
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)
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 on
page 143
Standard response
Byte Meaning Note
0 Controller address Same as in the query
1 3 Same as in the query
2 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 on page 143

ComAp InteliGen NT BaseBox Specifications

General

Brand	ComAp
Model	InteliGen NT BaseBox
Category	Controller
Language	English