Serial Port Properties: Serial Port Connection

If you select the serial port connection method, you need to define the following:
Baud Rate | Enter the baud rate for communications. Click the drop-down list to the right of the input field and select a rate from the list. |
Data Bits | Select the number of data bits per word to be used for communications. |
Parity | Select the parity to be used for communications. |
Stop Bits | Select the number of stop bits to be used for communications |
Flow Control | Select the type of flow control to be used for communications. If you change the Flow Control type, you must reboot the PC for the changes to take affect. |
Remember that you must configure the same baud rate, data bits, parity, stop bits and flow control for all PLCs using the serial port.