Source:  AIOCOMX

Explanation:  The LOAD AIOCOMX command line specified an invalid value for the MAXRATE= parameter, which sets the maximum baud rate for the port. You can set the MAXRATE= parameter to 9,600, 19,200, 38,400, 57,600, or 115,200.

If AIOCOMX is already loaded, the previously loaded port configurations remain active; the current loadcommand does not create a new port configuration.

Action:  Reenter the LOAD AIOCOMX port with a valid MAXRATE= parameter.

Note that AIOCOMX queries the communications hardware during initialization and sets the maximum speed to2,400 bps for 8250/16450 UART devices and 19,200 bps for 16550 UART devices. However, internal modems that emulatethese UARTs might be capable of higher speeds because of additional buffering. If you know your internal modem hasthis capability, you can use MAXRATE= to increase the maximum allowed port speed. If you experience data loss tothe port, the maximum port speed is set too high.