Epson equity 320sx 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:

I/O 

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:

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.