Codan NGT 2010 RF Technical & Service Manual page 735

3012—Fault finding
Testing the serial interface
To test the serial interface:
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NOTE
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Switch off the entire data modem system.
Ensure the digi switch is still in position 0.
Ensure the system is set up correctly and all cables are secure.
Connect a PC to the Terminal connector on the rear panel of the data modem.
Start a communication session with the data modem using a terminal-emulation
program such as HyperTerminal ©.
Switch on the data modem system.
OK should be displayed on the terminal screen.
If you cannot identify a particular faulty PCB after conducting the
previous fault diagnosis tests, or if the data modem still does not work
after replacing the PCBs specified, the complete data modem should be
returned to Codan for servicing.
NGT Transceiver System Technical Service Manual