dial up modem


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Can any body help me to configure micrologix1500 with dialup modem. Application is having 3 micrologix 1500 connected with 1 SLC. All 4 PLCs are communicated with Dial up modem (basically it is GSM modem but we are using it as dial up modem. SLC is getting data from all 3 micrologix using modem connectivity. If possible please give me information about this applciation.