ModbusTCP. Cannot read majority of registers.

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pirx asked Jan 8, '20

ModbusTCP. Cannot read majority of registers.

I'm not new to ModbusTCP, but a newbe using it with Victron. I'v got a ESS config consisting of a MultiPlus II, CCGX, EM24 and BYD B-box Pro.

I'm using Modbus out of OpenHAB installation. The purpose is to visualize some ESS data and change the charge and discharge behavior of the storage in some rare situation. I.e. I don't want to charge my electric car from my house batteries.

However, I was able to read only very few registers. The device class com.victronenergy.system seems to work corectly. I can as well access com.victronenergy.settings, but the results have no meaning and the system is not reacting on changes. I.e. I've set "ESS max discharge current" to 0 (to stop discharging) without any effects. The question is why?

What really hits me is that I get error 0x0A (GatewayPathUnavailable - no device found)) when reading com.victronenergy.vebus or com.victronenergy.battery.

What's wrong here?

Multiplus-II CCGX Color Control Modbus TCP

1578495650940.png (1.4 KiB)

1578495783862.png (1.4 KiB)

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Answer 1 · 2020-01-08T15:32:18Z

pirx answered · Jan 08, 2020 at 03:32 PM

I'sorry but I already found my mistake. It was the wrong device ID.

The question can be closed.

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mvader (Victron Energy) ♦♦ commented · Jan 08, 2020 at 06:24 PM

Thanks for confirming; thats what I was about to suggest ;o)

0 ·

Answer 2 · 2022-08-31T15:31:34Z

matt1309 answered · Aug 31, 2022 at 03:31 PM

@Pirx Hey I'm aiming to do the same as what you have accomplished. However I'm miles behind. Would yuou mind sharing your openhab.thing for the modbus binding.

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Answer 3 · 2022-09-04T07:19:54Z

@matt1309, here is part of my modbus.thing:

//-----
//
// Victron CCGX
//
//
Bridge modbus:tcp:ccgx [ host="192.168.178.13", port=502, id=0 ] {

    Bridge poller holding1 [ start=842, length=2, refresh=5000, type="holding" ] {
        Thing data BAT_ChargeLevel  [ readStart="842", readValueType="int16", writeStart="842", writeValueType="int16", writeType="holding" ]
        Thing data BAT_SoC          [ readStart="843", readValueType="uint16", writeStart="843", writeValueType="int16", writeType="holding" ] 
    }

    Bridge poller holding2 [ start=817, length=6, refresh=5000, type="holding" ] {
        Thing data AC_consumption_L1 [ readStart="817", readValueType="uint16" ]
        Thing data AC_consumption_L2 [ readStart="818", readValueType="uint16" ]
        Thing data AC_consumption_L3 [ readStart="819", readValueType="uint16" ]
        Thing data Grid_L1 [ readStart="820", readValueType="int16" ]
        Thing data Grid_L2 [ readStart="821", readValueType="int16" ]
        Thing data Grid_L3 [ readStart="822", readValueType="int16" ]
    }

    Bridge poller holding3 [ start=2702, length=3, refresh=50000, type="holding" ] {
        Thing data MaxDischargePrct [ readStart="2702", readValueType="uint16", writeStart="2702", writeValueType="int16", writeType="holding" ]
        Thing data ControlLoopSetpoint [ readStart="2703", readValueType="int16", writeStart="2703", writeValueType="int16", writeType="holding" ]
        Thing data MaxDischargeCurrent [ readStart="2704", readValueType="uint16", writeStart="2704", writeValueType="int16", writeType="holding" ] 
    }

    Bridge poller holding4 [ start=2901, length=1, refresh=50000, type="holding" ] {
        Thing data BAT_MinimumSoC [ readStart="2901", readValueType="uint16", readTransform="JS(divide_by_10.js)", 
                    writeStart="2901", writeValueType="int16", writeType="holding", writeTransform="JS(multiply_by_10.js)" ] 
    }
} 

//-----
//
// Victron Grid Meter
//
//
Bridge modbus:tcp:grid [ host="192.168.178.13", port=502, id=30 ] {

    Bridge poller holding30 [ start=2622, length=12, refresh=60000, type="holding" ] {
        Thing data EnergyFromGrid_L1 [ readStart="2622", readValueType="uint32", readTransform="JS(divide_by_100.js)"]
        Thing data EnergyFromGrid_L2 [ readStart="2624", readValueType="uint32", readTransform="JS(divide_by_100.js)"]
        Thing data EnergyFromGrid_L3 [ readStart="2626", readValueType="uint32", readTransform="JS(divide_by_100.js)"]
        Thing data EnergyToGrid_L1 [ readStart="2628", readValueType="uint32", readTransform="JS(divide_by_100.js)"]
        Thing data EnergyToGrid_L2 [ readStart="2630", readValueType="uint32", readTransform="JS(divide_by_100.js)"]
        Thing data EnergyToGrid_L3 [ readStart="2632", readValueType="uint32", readTransform="JS(divide_by_100.js)"]
    }
}

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