If users have multiple devices connected on the RS485 bus (in parallel), each individual device needs a specific MODBUS Slave ID.Įvery MODBUS request starts with the host contacting the Slave ID of the desired device, and the answer replies with the Slave ID of the transmitting slave device. The master/host always initiates any communication. Slave devices respond solely to host/master requests. Messages transmitted by MODBUS provide basic read and write operations via binary registries (known as “Coils”), and 16-bit words. The MODBUS RS485 protocol articulates communication between hosts (AKA “Masters”) and devices (AKA: “Slaves”), allowing a query for device monitoring and configuration.
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