Hitachi SJ Series, User Manual

Page: 509 / 786

14-18
Chapter 14 RS485 Communication
14.4.8 Writing and reading out to multiple
registers [17h]
• Write and read out to consecutive multiple registers.
Query:
Response:
*1) Note that the starting address of retention register is
one less than the register No. The value obtained by
subtracting one from the register No. is the register
address.
• When a writing and reading out to multiple registers
cannot be executed normally, se
e “3.9 Exceptional
Responses”.
(Example) To the inverter with slave address “1”, to write
50.00Hz for the output frequency setting [FA-01] and read
out output frequency monitor value [dA-01].
No. Field Name Example (Hex)
1 Slave address 01
2 Function code 17
3 Readout register starting address (high) *1) 27
4 Readout register starting address (low) *1) 10
5 The number of readout registers (high) 00
6 The number of readout registers (low) 02
7 Writing register starting address (high) *1) 2A
8 Writing register starting address (low) *1) F8
9 The number of writing registers (high) 00
10 The number of writing registers (low) 02
11 Writing data bytes n 04
12 Writing data 1 (high) 00
13 Writing data 1 (low) 00
14 Writing data 2 (high) 13
15 Writing data 2 (low) 88
16 CRC-16 (high) F4
17 CRC-16 (low) 86
No. Field Name Example (Hex)
1 Slave address 01
2 Function code 17
3 Readout data bytes n 04
4 Readout data 1 (high) 00
5 Readout data 1 (low) 00
6 Readout data 2 (high) 13
7 Readout data 2 (low) 88
8 CRC-16 (high) F4
9 CRC-16 (low) 71
!
A
(Register address) = (register No.) - 1
0000 1388h → 5000d → 50.00Hz
(Register address) = (register No.) - 1
0000 1388h → 5000d → 50.00Hz