PLC and modem communications

[Guest alf]

Let me apologies with members, I think i´m messing all the forum with old and new registrations, I hope this is the good one, and you don´t have to pull to my ears. I,ve tried to ask to Jay, but I think I´ve reached. So I think I´m AlfonsoRM, alf and alfonso, as log in with alf the seems to work, I will ask my questio again as member alf. Thanks to all, and again please excuse me. When I connect a Modem to a PLC, for example a Westermo Modem with a CJ1 of OMRON, they communicate through port RS232, using RXD & TXD ?, and if so what kind of ladder should I write? This is: if I want to programme a simple alarm to be sent by phone through the modem, but I dont know what kind of word and how to get to the modem. Please any short sample to learn. Thank you so much. By the way, if I have Syswin, is there any way to read something programmed with CX Programmer?