Before running the test, be sure that the printer is on-line, paper is loaded, and all connections are secure, or you may see one of the following error messages:

Error - Printer out of paper Error - Printer not selected Error - Printer interface I/O error Error - Time out on printer

Communication Adapter Test

Before running this test on your serial port, you must connect a special RS232C, AT-type loopback connector to the port. This connector enables the test to send out data and receive the same data back on one line. You can purchase the connector from most electronic supply stores.

Be sure the connector is configured with the following settings:

0RD and TD shorted D DSR and DTR shorted

0CTS and RTS shorted.

This test resets the computer to check for possible errors. Then it checks the port by sending and receiving data and testing the following port parameters:

0 9600 baud rate

0 Odd parity

0 2 stop bits

D 8-bit data length.

C-24 Performing System Diagnostics