A register address or register reference is always in the context of the slave’s registers. 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).
0 kommentar(er)
