Operation; Operating Steps; Communication Protocol (Modbus-Rtu); Supported Function Code - BENSHAW RSi GX Series Hardware Manual

7 - Remote Communication
7.4

Operation

7.4.1

Operating Steps

1) Check whether the computer and the drive are connected correctly.
2) Turn ON the drive. But do not connect the load until stable communication between the
computer and the drive is verified.
3) Start the operating program for the drive from the computer.
4) Operate the drive using the operating program for the drive.
5) Refer to "Troubleshooting" if the communication is not operating normally.
7.5

Communication Protocol (MODBUS-RTU)

Use Modbus-RTU protocol (Open protocol).
Computer or other hosts can be Master and drives slave. The drive responds to Read/Write
command from Master.
7.5.1

Supported function code

Function Code
7.5.2

Exception code

Function Code
User define
7.5.3

Baudrate

1200, 2400, 4800, 9600, 19200bps (Default value of 9600bps)
132
0x03
0x04
0x06
0x10
0x01
0x02
0x03
0x06
0x14
Description
Read Hold Register
Read Input Register
Preset Single Register
Preset Multiple Register
Description
ILLEGAL FUNCTION
ILLEGAL DATA ADDRESS
ILLEGAL DATA VALUE
SLAVE DEVICE BUSY
1. Write Disable (Address 0x0004 value is 0).
2. Read Only or Not Program during Running.