Instruction manual

7. MODBUS
IMS01J02-E1
116
7.2.2 Preset single register [06H]
The query message specifies data to be written into the designated holding register. The write data is
arranged in the query message with high-order 8-bit first and low-order 8-bit next. Only R/W holding
registers can be specified.
Example: Data is written into the holding register 00C8H of slave address 1.
Query message
Slave address 01H
Function code 06H
Holding register High 00H
number Low C8H
Write data High 00H
Low 64H
CRC-16 High 09H
Low DFH
Normal response message
Slave address 01H
Function code 06H
Holding register High 00H
number Low C8H
Write data High 00H
Low 64H
CRC-16 High 09H
Low DFH
Error response message
Slave address 01H
80H + Function code 86H
Error code 03H
CRC-16 High 02H
Low 61H
Contents will be the same as query message data
Any data within the range