Communication Adapter Test - Epson EQUITY 386SX/16 PLUS User Manual

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
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:
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:
C-24 Performing System Diagnostics
error
I/O