Source:  AIOCOMX

Explanation:  AIOCOMX detected a 16550 UART device in the port hardware, enabled the 16550 FIFO mode, and set the maximum port speed to 19,200 bps. The receiver data threshold is `R', and the transmit FIFO queue is `T'.Standard values of `R' and `T' are 4 and 16, respectively, unless they have been altered by means of the RXT= and TXQ= parameters on the LOAD AIOCOMX command line.

Action:  If the port settings are acceptable, no action is required. If you want to change port operation, you must unload and reload AIOCOMX.

You can view the command line load parameters by entering the LOAD AIOCOMX ?command.