View single post by slychiu
 Posted: Saturday Jan 27th, 2018 11:44 am
 PM  Quote  Reply  Full Topic 
slychiu



Joined: Saturday Apr 29th, 2006
Location: Singapore
Posts: 5493
Status: 
Offline

  back to top

Comfiguring a Modbus system can be complex
The Modbus addressing, Communications modes ie TCP or RTU, Modbus over IP must be understood. For RTU the baud rate and parity must be known, and whether the Modbus device is a Master or Slave and the meaning and usage of the Modbus Registers (Coil, Input Register, Holding Register, Discrete Input

A good introduction is the wikipedia article https://en.wikipedia.org/wiki/Modbus



Software Tools

QModbusMaster is an excellent free software tool for testing UCM/Modbus in Slave Mode. The software can be set up as a Modbus Master to communicate with UCM/Modbus in Slave Mode. It works in RTU and IP modes. 
Download from https://sourceforge.net/projects/qmodmaster/

PyModSlave is a similarly good  free tool for testing UCM/Modbus in Master Mode.  The software can be set up as a Modbus Slave to communicate with UCM/Modbus in Master Mode. It works in RTU and IP modes. 
Download from https://sourceforge.net/projects/pymodslave/files/


Last edited on Saturday Jan 27th, 2018 11:56 am by slychiu

 Close Window