I searched AB's and Belden's websites for info on RS-232 and DF-1 communications. I have a Raco Gateway autodialer that will communicate over DF-1 to a CLX, but I can't find specs for a cable. The only thing I've found is a reference to part numbers on the Belden FAQ page. I thought AB had cables listed on their website?

Please point me in the right direction to get info on RS-232 cables. At least a part number and simple description. Thanks.

See below for the null-modem cable. Your other option is of course a straight thru cable.
I would look at the manual for your autodialer for what they require.

They are stock cables, either "null modem" or straight, depending on whether the Raco thing is a DTE or DCE device. PLC's are always DTE's so if the Raco is DCE (modems typically are) then you just need an RS-232 cable. Otherwise, you need a "null modem" cable which switches the transmit/receive pins.

Either way, a local electronics/PC store sells the cables you need. No need for an Allen Bradley part number at all. If you have to have an electronics source, the usual suspects in terms of IT sources will work. I've also found www.bb-elec.com works well. In addition, they sell a "mini RS-232 tester" which is a little box with red/green LED's that indicate polarity on each of the major RS-232 pins that can be used to trivially diagnose cabling issues and definitively distinguish DTE and DCE devices.