Epson Equity Ie Q50188015-1 - Manual (Page 105)

Each baud rate is tested in turn, and the display informs you of the progress
of the test. If the port does not become ready correctly, a timeout error
occurs. If any data received does not match the data sent, a verify error
occurs, and the computer reports the transmitted and received data at the
time of the error.
The final test is an echo back check during which the port sends data to
itself at 9600 baud, using various data formats. At the start of the test, you
see this message:
RS232C echo back check - with various data
formats
Current data format: 5 data bits, 1 stop bits,
parity -
NONE
Current test data is 00
Once again, if any data received does not match the data sent, a verify error
occurs, and the computer reports the transmitted and received data at the
time of the error.
Alternate Serial Port Check
Use this option to test the functions of an additional serial communications
(RS-232C) port. To perform the test you must insert a special loop-back
connector into the alternate serial port so that the computer can check the
port’s individual pins.
This test is identical to the check for the primary serial port. For more
details, see the section describing the serial port check earlier in this chapter.
Performing System Diagnostics D-17