Learn how to connec a RedLion Modbus RTU Slave to Modbus Master. In this scenario, the Modbus Slave would be the RedLion via RS232 comm port, and the Modbus Master would be my laptop.

Like any modern laptop, I do not have a serial port on my laptop, so I had to use USB to serial cable made by Profilic. See image below.

Xybernetics RedLion - Making Comms Via RS232 Comm Port

You will also need a DB9 to RJ12 cable.

Xybernetics RedLion - Making Comms Via RS232 Comm Port
Xybernetics RedLion - Making Comms Via RS232 Comm Port
Xybernetics RedLion - Making Comms Via RS232 Comm Port

Connect the USB to serial and the DB9 to RJ12 cable using null modem connector (orange connector). I had to use a gender bender as well (yellow connector).

Xybernetics RedLion - Making Comms Via RS232 Comm Port

Connect RJ12 to the Red Lion RS232 port.

Xybernetics RedLion - Making Comms Via RS232 Comm Port

I have a Modbus Master simulator setting as follows.

Xybernetics RedLion - Making Comms Via RS232 Comm Port

These are the results. The red boxes are hexidecimal number and the orange box is decimal floating numbers.

Xybernetics RedLion - Making Comms Via RS232 Comm Port

Here is another test result.

Xybernetics RedLion - Making Comms Via RS232 Comm Port
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About the
I am a software developer in Calgary, Alberta, Canada with passion in getting my fingers in any new technology. I started software development when I was 10 years old and have never looked back. Now with well over 35 years of software development, I wanted to share some of these key knowledge with the people of the world in the wide web.