Gabriel. May 24, 2003. #1. Hi, I'm looking for free source code (or examples) of ModBus protocol in C or C++. I would like to establish a communication between a computer (windows or linux) and a measure equipment, that communicates via ModBus protocol. The physical Layer is RS485. I'm looking forward for a reply. Gabriel.
The difference between these two quantities is "offset". Each table has its own offset, respectively: 1, 10001, 30001 and 40001. The following is an example of a Modbus RTU request for obtaining the AI value of the holding registers from registers # 40108 to 40110 with the address of the device 17. 11 03 006B 0003 7687.