USA QL SERIAL PORTS
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(from Dex, on QL Forum)

I have examined an American QL serial/parallel interface.
The serial pinout is this:

English QL (RJ connecotor): German/American (9 pin Canon):

6 ----------------------------------- 5 (+12 V)
5 ----------------------------------- 9 (CTS SER1, DTR SER2)
4 ----------------------------------- 4 (DTR SER1, CTS SER2)
3 ----------------------------------- 8 (RxD SER1, TxD SER2)
2 ----------------------------------- 3 (TxD SER1, RxD SER2)
1 ----------------------------------- 7 (GND)

Pins 1, 2 and 6 on Canon are NC.

On a Samsung QL the serial ports are sockets (holes) and the Ctrl ports are plugs (pins).