Communication Settings

To establish communication with a device, the associated Board, Port and I/O Device need to be correctly configured in Plant SCADA Studio's Topology activity.

If you use the Express Communications Wizard to connect to a device, these settings will be automatically configured for you. However, if you need to manually configure them, use the settings outlined below.

Boards

Typically, you would use a serial board or COM port for this communication.

Board Type

Enter COMx.

Address

Enter 0.

I/O Port

Leave this field blank.

Interrupt

Leave this field blank.

Special Options

Leave this field blank.

Ports

Port Number

This value should match the COM port number. This number is defined in the Ports section of the Control Panel.

Baud Rate

This value must match the setting of the PCD - 9600 is the default.

Data Bits

Enter 8.

Stop Bits

Enter 1.

Parity

This protocol can use two different transmission methods: 1) a Parity changing method or 2) a Break method of transmission. The Plant SCADA SBUS driver uses as default the parity changing method. Run the SAIA PCD Programming Utilities to set the PLC the transmission method.

Special Options

You may want to use the Special Options for the COMx Driver if you are using a Modem (or similar) and want the driver to perform differently.

I/O Devices

I/O Device Address

The station address (1-90) configured on the PCD, for example:

• 1 specifies PCD address 1.

• 49 specifies PCD address 49.

I/O Device Protocol

Enter SBUS.