![]() The master will write data to a slave device’s registers, and read data from a slave device’s registers. This means a slave device cannot volunteer information it must wait to be asked for it. ![]() Modbus protocol is defined as a master/slave protocol, meaning a device operating as a master will poll one or more devices operating as a slave. The Modbus protocol specification is openly published and use of the protocol is royalty-free. Modbus remains the most widely available protocol for connecting industrial devices. ![]() Modbus is an industrial protocol standard that was created by Modicon, now Schneider Electric, in the late 1970’s for communication among programmable logic controllers (PLCs).
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