Hitachi WJ C1 Series

Chapter 11 RS485 Communication
11-2-4
11.2.3 Write Coil [05h]
 How to write single coil status on Modbus communication?
 Write single coil. The coil status change is shown in the table below.
Data
Coil: OFF to ON
Coil: ON to OFF
Change data (High)
FFh
00h
Change data (Low)
00h
00h
 The following shows an example of RUN command for slave-address 1 inverter.
 In order to operate with a command from Modbus communication, "RUN command input source
selection, 1st-motor [A002]" must be set to "Modbus communication (03)" in advance. The coil
number for RUN command is 0001h.
Query
No.
Field name
Example
(HEX)
1
Slave address
*1
01
2
Function code
05
3
Coil address (High)
*2
00
Coil start No. = (Coil No.) - 1
4
Coil address (Low)
*2
00
5
Change data (High)
FF
OFF to ON:FF00h
6
Change data (Low)
00
7
CRC-16 (High)
8C
8
CRC-16 (Low)
3A
Response
No.
Field name
Example
(HEX)
1
Slave address
*1
01
2
Function code
05
3
Coil address (High)
*2
00
4
Coil address (Low)
*2
00
5
Change data (High)
FF
6
Change data (Low)
00
7
CRC-16 (High)
8C
8
CRC-16 (Low)
3A
*1. For broadcast, there is no response.
*2. Note that the starting number is 1 less than the actual register number. Specify a number of
"(Register No.) - 1".
A
Q