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 RS-232C, 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:

DRD and TD shorted

0 DSR and DTR shorted CI CTS 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:

Cl 9600 baud rate

0 Odd parity

Ll 2 stop bits

CI 8-bit data length.

C-24 Performing System Diagnostics