Do you know which serial port it is, ttya or ttyb?
To check to status of the serial port(s), type the command;
/cms/install/bin/abcadm -k
You should get a response like the following;
console set to local
/etc/ttydefs remote console baud rate set to 9600
ttya is set to incoming at 9600 baud
ttyb is not administered or is output[/color blue]
To remove incoming modem from port ttya, type the command;
/cms/install/bin/abcadm -r ttya
To set up a 9600 baud incoming modem on port ttya, type the command;
/cms/install/bin/abcadm -i -b 9600 ttya
Alternatively, if you are on the console, you can run the following command;
admintool&
This will bring up a GUI from which you can view/edit your serial port(s).