Digi SM-300 - Thermal Head Usage

SM-300 Service Manual
31
4.1.2.2 SIO Loop Back Test
KEY TO PRESS OPERATION
Testing the RS232C port.
Please plug in the test connector on the RS232Cport before
proceed (The test connector is show at below).
If the port is okay, it will display the message below.
SIO LOOP BACK TEST
THE TEST IS SUCCESSFUL
OR ELSE
SIO LOOP BACK TEST
TEST FAIL !
TEST CONNECTOR FOR SIO PORT
Connect pin 4 and 5