I don't know exactly whether the Siemens S7-1200 supports modbus communication protocol but in case it is, you can use serial RX/TX Arduino lines, some MAX485 chips together with the Arduino modbus RTU library. It works fine.A good pointer for Arduino rs485 communication might be the following:http://t.co/r26H2axoeventually, if it supports modbus tcp:http://www.biemmeitalia.net/blog/arduino-android-communication-modbus-tcp/I hope it helpselle
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