1B30035H01 Emerson I/O Process Control Base

1B30035H01 Emerson I/O Process Control Base

1B30035H01 modbus communication protocol, is a serial, asynchronous master-slave communication protocol, only one device in the network can establish the protocol, other devices can only respond to the host’s query by providing data, or according to the query to make the corresponding action. modbus protocol defines the format of the host’s query, which includes: master-slave addressing method (or broadcasting), the function code of the required action, the transmission data and error check, etc., or can not complete the host’s required action, it will organize a fault as a response. modbus protocol does not require special interfaces, the typical physical interface is rs-485.

 The modbus protocol defines the format of the host query, which includes: host-slave addressing method (or broadcasting), function code of the requested action, transmission data and error check, etc., or if it cannot complete the action requested by the host, it will organize a fault as a response. modbus protocol doesn’t need special interface, and the typical physical interface is rs-485. in the modbus communication network, it generally provides two communication modes: ascii-rtu and rtu.