FATEC B1z-14MR PLC Modbus® serial protocol decoding 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. PicoScope (Beta) software provides support for Modbus RTU and Modbus ASCII. More information on Modbus serial protocol decoding >>