FTDI cable / RS232 Data Modem question

I have been playing with some wireless modems that are RS232.  I was thinking they should should be plug and play with my FTDI cable right?  The cable is 5V and the modems are 5V and so are the rx/tx so I dont need a level converter right?  I am trying to get them to communicate with the software used to program them with no luck.  I swapped the rx/tx lines with no luck there either.  Do I need to buy a USB to RS232 converter?

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