Dear All, I'd like to remote monitoring a Gas station, could i use: 1.FX2N CPU 2.Analog Input Module(FX2N-4AD) 3.Serial Interface Module(RS-232) 4.Modem in The Station. Furthermore, in Central Control Room, i will using 1.Modem 2.PC(GX Developer, Visual Basic, Microsoft Excel,etc) I ever seen this configuration in Mitsubishi Remote Monitoring Catalogue, if I'm not mistaken in Example case no.3, but it seems like 1:1 Communication only. What about 1:n communication, I mean for future The Central Control Room should monitoring more than 1 station. I will very grateful if anyone have the better suggest. Thanks, Ricky