4. Click OK to add the serial module.
5. Select a serial module. There are four serial ports to be configured,
RS232-1, RS232-2, RS485-1 and RS485-2. Select the target port
and configure appropriate values for the following parameters.
Parameter Description
Baud
Rate
300, 600, 1200, 2400, 4800, 9600, 19200, 38400,
57600, 115200
Parity None, ODD, EVEN
Data Bits 7, 8
If you select Modbus RTU Slave or Modbus RTU
Master for the Protocol Binding, the Data Bits is set
as 8 by default.
Stop Bits 1, 2
For RS232-1 and RS232-2, you should configure one more
option: Flow Control. See the following table for the parameter
descriptions.
Parameter Description
Flow Control Only for RS232-1 and RS232-2
l None
l RTS-CTS
l RTS
6. Under Protocol Binding, select a protocol from the Port Protocol
drop-down list.
The following table provides information about various protocols
supported by serial ports.
Protocol Description
Modbus
RTU
Slave
The controller acts as the Modbus Slave and used for
communication between:
l Controller and SCADA
l Controller and third-party Modbus Master
devices
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Chapter 4 - Software
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