Source:  AIOCOMX

Explanation:  AIOCOMX detected an 8250/16450 UART device in the port and set the maximum port speed to X. The MAXRATE=parameter in the LOAD AIOCOMX command line set the maximum port speed to X. If the MAXRATE= parameter is not used, the default maximum port speed is 2,400 bps.

Action:  If the port hardware supports speed X, no action is required. If the port does not support the displayed speed, unload AIOCOMX and reload it with the correct parameter settings.

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