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Is it possibe and if so to send LED Flash command to IFM AY1020 device using libmodbus?

I can archive it via browser: Screenshoct

But i need to do it from C code.

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    This question is too broad. You should probably read the device documentation. – user694733 Jun 28 '17 at 07:44
  • communicating with a MODBUS is relatively simple. However, you probably will need a converter from RS232 to MODBUS. You will need to learn the format of the MODBUS messages. You will need to learn which 'coils' control the leds and what those coils expect in the form of data. – user3629249 Jun 30 '17 at 00:41

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