Changer Gender Serial

How do I know if my 9-pin serial cable is a null modem?

I have a 9-pin serial cable that I found in a box of computer cables that I have. I would like to use it to connect to an Apple ImageWriter II printer with my PC. I have a gender changer and an adapter cable as well to connect it to the ImageWriter since it uses 8 pin DIN-8 serial. I also know that the whole process needs a null modem somewhere, and I was wondering if my female-female serial cable is a null modem. How can I find out? It has absolutely no markings on it anywhere, except the RU and SA logos on the ends.

Usually female to female 9 pin were null modem type of cables. If you have an ohm meter, check pins 2 and 3. If 2 on one end goes to 3 on the other end, it is null modem. If 2 goes to 2, it is a straight cable.

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