RS-232C Port Framing Error

What does A528.03 mean?

This flag turns ON when a framing error occurs during RS-232C communication. This indicates that the received data frame does not have a valid start and stop bit sequence, often due to mismatched baud rates or data formats. This error flag is valid in Serial Gateway mode and for Polled Units in Serial PLC Link Mode.

• Mismatched baud rate settings between the RS-232C port and the connected device
• Incorrect data length or stop bit settings
• Severe noise or interference on the RS-232C communication line

Click steps to track your progress.

1. 1

   Verify the baud rate, data length, and stop bit settings for the RS-232C port match the connected device's settings

2. 2

   Inspect the RS-232C cable for damage or loose connections

3. 3

   Restart the RS-232C port by turning ON the Serial Port Restart Bit (A526.00) from OFF to ON