Modicon M340 modem connectivity


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I'm having some issues connecting to the Modicon M340 PLC via dial-up US Robotics 33.6 fax modem. I can connect to the controller via Unity software, and I can transfer a program, but the transfer doesn't complete until the software times out. An error message shows up saying something about "PLC didn't return a ReadyStatus". Has anybody encountered this issue?