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I want to set up a remote monitoring station for some PLC / Instrument at a plant which is linked through telephone. Doesnt have to be real time. We want to Dial up from the Remote station and check and d/l data at the plant. I need advice on the configuration and design requirements. I know that there are commercial products which do this but we want to build it from scratch with only the basic components purchased and the software built in-house. Could somebody advise regarding the following. 1. Softwares required. We would like to have the ultimate output on DDE-Linked XL sheets. 2. Hardware required. The basic instrumentation with 4-20 mA signals (say 5-10 nos) is available. Thanks and Best Regards Parag Bhadra