SPK107 with Altivar. Right drow Modbus RTU

At the invitation of NPO "Centrifugal Systems" the task was set to create application software for the panel of the "Oven" company SPK107. It didn't turn out to defeat the problem on the first try. The thing turned out to be that individually these devices work well, but when they connect to each other they refuse to see, and both have Modbus TCP in the specification. I put 120Ω terminators, picked up different wires, but here's an ambush - they refused to work together. Having carefully read the documentation from Altivar, I found it necessary to install not only a resistor at the two ends of the line, but also capacitors. It was impossible to believe in it, but ...

Attention!!! Having established all this exactly - it worked)

Russian version

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