question

floyd avatar image
floyd asked

Modbus via RS485 Serial USB on CCGX has intermittent responses

I am building my own Lithium BMS for my Victron setup using the example python scripts.

When my RS485 USB Serial adapter is connected to a Raspberry Pi (latest Raspbian), I am able to reliably read the appropriate registers from the lithium batteries without any errors. However, when connecting the same adapter and running the same python code on the CCGX, I only get a successful response very intermittently.

Does the CCGX lock the USB port? Or is it a pymodbus version issue? What can I look for?

Lithium BatteryBMSCCGX Color Control
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Daniël Boekel (Victron Energy Staff) avatar image Daniël Boekel (Victron Energy Staff) ♦♦ commented ·

Hi @floyd

I've moved your topic to the 'modifications' area.

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1 Answer
mvader (Victron Energy) avatar image
mvader (Victron Energy) answered ·

Hi Floyd, check the here, and then especially the topics around serial-starter:

https://github.com/victronenergy/venus/wiki/howto-add-a-driver-to-Venus

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floyd avatar image floyd commented ·

Thanks @mvader (Victron Energy) - this answers my question. (I probably should have done a better search...)

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