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    Neuron and Jablotron alarm interconnect via RS485

    UniPi Neuron Series
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    • R
      rvalo last edited by

      Hi everybody,

      I would like to interface my Jablotron JA100 home alarm with Unipi Neuron. I have JA-121T RS485 interface installed within my alarm, but I want to be sure how to physically wire the RS485 bus between the devices. There are 4 RS485 terminals on JA-121T side (D+, D-, GND and U+). D- and D+ are clear (they should be interconnected with A and B terminals on Unipi side), but I'm not sure where to connect the common ground on Unipi. Furthermore, there is common + terminal on JA side, which is completely out of 3-wire RS485 specification.
      So, to make my question short - could you please advice, how to connect 3-wire RS485 bus (with common reference ground) to Unipi?

      Thanks a lot in advance
      Roman

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      • A
        AVsetula administrators last edited by

        Dobrý den,

        modul JA-121T s UniPi propojit lze. Na straně RS485 máte celkem 4 kontakty, kde D+ je myšleno jako A a D- jako B. Svorky U+, GND jsou určeny pro napájení oddělené části čipu s RS485. Podle letáku JA-121T (zde) lze zjistit, že napětí mezi svorkami U+ a GND může být v rozsahu 6-28 VDC, můžete proto použít napájení 24 VDC určené pro jednotku Unipi. Spotřeba je 15mA. Pokud chcete použít kabel se stíněním, uzemněte jej na straně PLC. Modul JA-121T není modbus zařízení a proto zatím není integrován v Mervis IDE. Na vývoji se pracuje.

        Obr. k popisu zapojení
        0_1578411561423_Screenshot_1.png

        S pozdravem
        Antonín Všetula

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