SH-300
User’s Manual Connection with PLC
Page 83 of 103
4.16 MODBUS RTU/ASCII and RTU/ASCII EXTEND protocol
1. Introducing Modbus Protocol
SH-300 communicates by using a master–slave technique, in which one SH-300(the master)
can send query message. one programmable controller(the slave) responds according to the
requested data supplied by SH-300. The Modbus protocol establishes the format for the master’s
query by placing into it the device address, a function code, any data to be sent, and
error–checking field. The slave’s response message is also constructed by using Modbus
protocol. It contains fields confirming the action taken, any data to be returned, and an
error–checking field. The returned data bytes contain the data collected by the slave, such as
register values or coil status. If error occurred in receipt of the message, or if the slave is unable
to perform the requested action, the slave will construct an error message and send it as its
response.
2. MODBUS RTU/ASCII and RTU/ASCII EXTEND communication parameter configuration:
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