4
.......................................................................................1
.........................................................................2
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...........................................................................................12
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Warning
Caution
Warning
Usage
W
arning
2.3 Function Code
Function code
0x01
0x04
0x10
Function name
Read Coils
Read Input Register
Write Holding Register
Function
Read
Read
Write
Code
0x 01
0x02
0x03
0x06
Name
Illegal function code
Illegal data address
Illegal data
Slave busy
2.4 Abnormal Reply
The master unit sends requests and waits for reply from the slave.When there’s no
error occurs, the slave will reply normally, but when there’s data checking error, the
slave won’t answer. When the master unit sends wrong data (except for checking
error), the slave will answer abnormally.
Meaning
Function code received by the
slave can’t be executed.
The received data address is
not allowed.
Value in query data field is not
allowed by the slave
The slave is busy with a long-time
program command. Ask the
master to send messages when
the slave is free.
3 Usage Introduction
3.1 IP Configuration
The default IP address is 192.168.1.200 when modbus gateway leaves the factory.
The PC used for visiting websites must be in the same subnet segment with
modbus gateway, which means it should be 192.168.1.xx (xx is from 2 to 254).
There are 2 ways to configure IP: static configuration and multi-IP addition
3.1.1 Single IP Configuration
Open protocol dialog, configure the IP address and subnet mask, for example: IP:
192.168.1.211, subnet mask 255.255.255.0
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