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You may have a hard time finding a single cable that will work. What you need is a straight through DB9 female to female that has:
pin5-pin5
pin3-pin3
pin2-pin2
Typically, you can find straight through cables but they are often female on one end, and male on the other, and you can find female to female cables, but they typically have pin2-pin3 and pin3-pin2 , and/or are null modem cables. The RS232 specification is just the electrical specification, and doesn't have much to do with what pin goes where, or what type plug, etc. I have seen many places that RS232C refers only to 25 pin connectors, and what we need here are 9 pin connectors, however many places use RS232C to refer to 9 pin also, so basically RS232 or RS232C doesn't really help with respect to you knowing if you have the right cable. Basically you have may have to check it out with a VOM. Or, if you have bought one, and it doesn't work, try reversing pin2 with pin3 on one end.
That said, your best bet of buying something off the shell that will work, is to get a regular straight through cable (ie male-female), an also get a female-female "gender changer", both of which you can get at RS. This is basically what I am using, and it has worked, although I actually made my cable myself, but just ran out of female connectors, so I used a male and a gender changer. The important part though, is that the genders match, and that pin2 goes to pin2, and pin3 goes to pin3.
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Linear Mode
