Last month we introduced you to our exclusive Modbus RTU and ASCII serial decoding protocol in PicoScope 6. This month we wanted to give our readers more information on Modbus, its architecture, versions, function codes and more.
Modbus is a low-speed serial data protocol commonly used in industrial applications where a supervisory computer (master) controls or monitors multiple remote devices (slaves).
The specification was originally published in 1979 by Modicon (now Schneider Electric) for use with its programmable logic controllers (PLCs).
In a standard Modbus network there is one master, and up to 247 slaves each with a unique address from 1 to 247. [2017-08]