Hitachi SJ300 用户手册

 
 
 

Page 17 of 36 

 

 
Once the SJ-EN board has been properly configured and connected to a network as described in Chapter 3, it is 
capable of reading data from and writing data to the inverter. However if it is desired to have either the RUN 
command and/or the speed reference come from the Ethernet master, you must change two inverter parameters 
as shown in the following table. 
 

Frequency 
Source 
Setting 

Six options; select codes: 
00 Keypad potentiometer 
01Control terminal 
02 Function F001 setting 
03 RS485 serial command 
04 Expansion board 1 
05 Expansion board 2 

8 8

02 

Run 
command 
source setting 

Five options; select codes: 
01 Input terminal [FW] or [RV] 
(assignable) 
02 Run key on keypad, or 
digital operator 
03 RS485 serial command 
04 Start/Stop, expansion card #1 
05 Start/Stop, expansion card #2 

8 8

02 

 
 

 
The SJ-EN is implemented with the MODBUS/TCP communication protocol. It supports the following 
MODBUS functions: 
 

•  READ MULTIPLE REGISTERS (03) – This function reads the contents of a contiguous block 

of holding registers in the inverter. 

 

•  READ INPUT REGISTERS (04) – This function reads from 1 to up to around 125 contiguous 

input registers in the inverter. 

 
•  WRITE SINGLE REGISTER (06) – This function will write to a single holding register in the 

inverter. 

 
•  WRITE MULTIPLE REGISTERS (16) – This function will write to a block of contiguous 

registers in the inverter. 

 
Additional MODBUS/TCP protocol details, including specifications, application information, implementation 
guides, and other resources are available from the web site 

.