Hitachi SJ Series, User Manual

Page: 505 / 786

14-14
Chapter 14 RS485 Communication
14.4.4 Writing to retention register [06h]
• Perform a writing to the specified retention register.
(Example)
To write 50Hz as the 0 speed command [Ab110] to the
inverter with slave address 1.
Query
Field Name Example (HEX)
1 Slave address *1) 01
2 Function code 06
3 Register starting No. (high) 2F
4 Register starting No. (low) 4D
5 Data to be changed (high) 13
6 Data to be changed (low) 88
7 CRC-16 (high) 1C
8 CRC-16 (low) 5F
*1) When a broadcasting is performed, a response is not
returned.
• When a writing to a retention register cannot be executed
normally, see “3.9 Exceptional Responses”.
• In order to set 50Hz, set the data to be changed to “5000
(1388h) because the data resolution of retention register
“2F4Eh” for 0 speed command [Ab110] is 0.01Hz.
Response
Field Name Example (HEX)
1 Slave address 01
2 Function code 06
3 Register starting No. (high) 2F
4 Register starting No. (low) 4D
5 Data to be changed (high) 13
6 Data to be changed (low) 88
7 CRC-16 (high) 1C
8 CRC-16 (low) 5F
*3) Note that the starting address of [Ab110] retention
register is “2F4Dh”, which is one less than the register
No. “2F4Eh”. The value obtained by subtracting one
from the register No. is the register address.
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