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luc-bosmans avatar image
luc-bosmans asked

Modbus address 258 is not registered

Hi,

I want to connect my Raspberry/Node-red to a Multiplus II GX to read some values.
Battery power does not report a value when I use the Modbus protocol.

This is the error that the GX reports:
ERROR "Error processing function code 3, unit id 225, start address 258, quantity 1, src 192.168.0.4: Modbus address 258 is not registered

- Other values can be read, ie battery voltage on address 259.
- Pylontech battery
- Multiplus II GX version 2.92

I use CCGX-Modbus-TCP-register-list Rev 44 as reference.

Am I doing something wrong?

Thnx,
Luc Bosmans.

Modbus TCP
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2 Answers
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wkirby answered ·

Register 258 is not on the current list. Rev.43 is the one I downloaded a few seconds ago, not sure about rev. 44

You can get battery power from register 842 (slave 100).

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Alexandre PY BLOUCH avatar image Alexandre PY BLOUCH commented ·
Dear @WKirby do you know the Modbus adresse from Pylontech Temperature ??? for monitoring it in my Home Assistant OS...


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luc-bosmans answered ·

Hi,

Indeed, version 44 seems to be removed from the website.
The actual version is 43.
FYI, I copied the version details of 44 below.

Modbus address 100/842 works fine.

Thanks @WKirby ,
Luc.

Rev 44 Document state 17 for battery state (Contactor check)

Add registers for pump-related controls

Add register for VE.Bus BMS (v2) pre-alarm

Add 32-bit registers for Multi-RS and SolarCharger total yield

Add register for VE.Bus charge state (similar to VE.Bus state, but provides additional info, and works better with managed batteries)
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Related Resources

Modbus TCP Basics