Epson 20 Benutzerhandbuch

Insert the loop-back connector. Then press Y and 

Enter 

to start the

check. The computer checks the port by writing and reading data

and control information, and reports errors for any pins that are

faulty. Note that if you connect a printer cable instead of a loop-back

connector, you will get errors.

Use this option to test the operation of an additional parallel port. To

perform the test, you must insert the special loop-back connector into
the alternate parallel port so that the computer can check individual
pins of the port.

This test is similar to the Parallel Port Check. For more details, see

the description of the Parallel Port (Printer Interface) Check.

Use this option to test the operation of an additional parallel port on

a video adapter. To perform the test, you must insert the special loop-

back connector into the parallel port on the video adapter so that the

computer can check individual pins of the port.

This test is similar to the Parallel Port Check. For more details, see

the description of the Parallel Port (Printer Interface) Check.

Use this option to test the functions of the primary serial

communications (RS-232C) port. To perform the test, you must insert

a special loop-back connector into the RS-232C port so that the

computer can check individual pins of the port. Contact your dealer

if you need a loop-back connector. Note that a different connector is

required to test the parallel port.

Performing System