Panasonic JS-170FR Series Service Manual page 109

8-2) COM2 test
(1) Connect a loopback connector to the COM2 port.
(The lock screw of the loopback connector shall be tightened normally.)
(2) Enter "2-ENTER" through the keyboard.
Test COM2 (I/O Address 02F8H)
RS232C Controller Register R/W Test
INTERNAL LOOPBACK Test
EXTERNAL LOOPBACK Test
Test done. Press any key.
(3) Finish the test after displaying OK for all the diagnostic items.
(4) Press any key to obtain the #8 Test screen.
(5) Disconnect the loopback connector that has been connected to the COM2 port.
(6) Enter "2-ENTER" through the keyboard.
Test COM2 (I/O Address 02F8H)
RS232C Controller Register R/W Test
INTERNAL LOOPBACK Test
EXTERNAL LOOPBACK Test
CD ERROR
CTS ERROR
Test done. Press any key.
(7) The "EXTERNAL LOOPBACK Test" shall result in "CD ERROR" and "CTS ERROR."
(8) Press any key to obtain the #8 Test screen.
LCD DISPLAY
***** TEST # 8 Serial port Test. ****
LCD DISPLAY
***** TEST # 8 Serial port Test. ****
3-25
OK
OK
OK
EXIT
OK
OK
EXIT