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HOWTO: Configure modbus devices without display through RS485 using DEXGate2

Last Updated: Jul 03, 2017 05:10PM CEST
When installing devices in a Modbus Network, the first step is to configure them with the same Baudrate than the rest of devices and with a unique Modbus Address. When the device has buttons, a screen and a graphical interface, it's easy to browse the menus to configure it, but what to do when your device has no screen and has to be configured through the RS485 BUS?

Some devices have to be configured through RS485 by writing the address or baudrate or some predefined value in a certain register (depending on each device).
This can be done through any Modbus Master program in a PC for example, but now DEXGate2 includes the "Write registers" feature that allows you to configure your devices directly from DEXGate2.

 

How to configure a non-screen device like the CIRCUTOR LM4i-4o

 


Check your Device Manual to look for which records to modify:


In the case of CIRCUTOR LM4i-40:
 

 
- The Modbus address must be entered in register 12288 (hex3000). 
- By default the LM4i-4 comes with address 98
- You must write Baudrate (1 for 9600) in register 12289 (hex3001). 
- By default the LM4i-4o comes with the Baudrate 19200


To change the Modbus address:
- The Modbus address must be entered in register 12288 (hex3000).
By default the LM4i-4 comes with ID 98
 
This action will configure the device with the Slave address #3


To change the Baudrate:
- You have to write Baudrate (1 for 9600) in register 12289 (hex3001)
 
This action will configure the device with the Baudrate 9600 Bd

Fur further information take a look at the ​Read & Write Register Section in DEXGate2 user Manual 

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