Craftsman G10-0R7G-2SB Manual

137(2) Transmission methodAsynchronous serial, half-duplex transmission. At the same time, only one of themaster and slave can send data and the other receive data. In the process of serialasynchronous communication, data is transmitted in frames and frames.(3) TopologySingle-master multi-slave system. The slave address is set from 1 to 247, and 0 is thebroadcast communication address. The address of each slave in the network is unique.This is the basis for ensuring Modbus serial communication.8.4 Protocol descriptionThe series inverter communication protocol is an asynchronous serial master-slaveModbus communication protocol. Only one device (host) in the network can establish aprotocol (called "query/command"). Other devices (slave) can only respond to the host's"query/command" by providing data, or according to the host's "query/command". Thehost refers here to a personal computer (PC), an industrial control device, or aprogrammable logic controller (PLC). The slave refers to a G10 series inverter or othercontrol device having the same communication protocol. The host can communicate witha slave separately and broadcast information to all slaves. For a host "query/command"that is accessed separately, the slave must return a message (called a response). For thebroadcast message sent by the host, the slave does not need to feed back the responsemessage to the host.8.5 Communication frameThe Modbus protocol communication data format of the G10 series inverter is dividedinto RTU (Remote Terminal Unit) mode.In RTU mode, the format of each byte is as follows:Encoding system: 8-bit binary, each 8-bit frame field contains two hexadecimalcharacters, hexadecimal 0~9, A~F.