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Chapter 8 RS485 communication
Powtran PR5200 series soft starter with built-in RS485 standard interface which can be
communicated with the PC and PLC host .
It Can be controlled by the host command of soft starter run/stop, monitoring the running state
of soft starter and modify its function data, and so on.
8-1.Summary of the modbus RTU communication protocol
Modbus is a kind of serial asynchronous communication protocol. The physical interface
RS485.Modbus is designed to modicon PLC, has the structure characteristic of PLC. Modbus in
network control, the soft starter can be compared to a PLC to read and write on it. Start-stop
control and status information (current, fault, etc.) And the function parameter mapping to keep
register area
8-1-1.Communication parameters
Baud rate:9600；8 Data bits；No parity bit；1 stop bit.
8-1-2.Communication data format
The data format:
8-2.The soft starter associated settings
8-2-1.Register address
Register function description
Soft starter function code
Register is not listed above is illegal, cannot read and write, otherwise it will report to the
controller an exceptional code from the station.
8-2-2.Support code
Soft start only supports the following code, if you use other code, will give exceptions to the
code.
Code 03 only WORD (WORD) to read.
8-2-3.The register description
0001 The command register
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