A port is configured in RealPort. When connecting in 115200bps, the server is sometime receiving bad characters. In 19200 bps, it seems fine. Is there a problem at this speed?
At higher baud rates, its important that some type of flow control is used or these sorts of things can happen, i.e. data loss or data getting scrambled. If you want to operate at the higher baud rate, I’d recommend using flow control both on the device connected to the Digi serial port, as well as on the Realport side, and the two settings need to match as far as the type of flow control being used.