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    First venture into MODBUS, how to send a password?

    Hi, This is my first venture into MODBUS, and I'm struggling getting things together. My setup is: 1) Heatpump with 2-wire RS-485 and MODBUS (According to manufacturer). Also a Wi-Fi module connected via RS-485. 2) Moxa IP-to-serial (NP-5430I) or simple RS-485 to USB, connected in parallel with...
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