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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

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:

RD and TD shorted

DSR and DTR shorted

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:

 9600 baud rate

 

Odd 

parity

 

2 

stop bits

 8-bit data length.

C-24

Performing System Diagnostics