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Modbus integration using the usb port
Posted: Sat Aug 17, 2024 1:28 pm
by ehoconnor
I have just got a FoxESS H1 Hybrid Inverter H1-5.0-E is there any way of just using the USB port to install Modbus for the Nathan Marlor Home assistant integration. What I would like to do is just plug into the USB port where the fox data logger is and then have a modbus to wifi connection in one? Is this possible? If not what should I use. I have read the posts on integrating but my invertor layout seems different. Many thanks,
Re: Modbus integration using the usb port
Posted: Sat Aug 17, 2024 2:34 pm
by Dave Foster
No the USB port cannot be used for external ethernet connections.
To run modbus you need to get access to the RS485 communications of the inverter which can be found on the meter/ct connector.
If you have a new H1 inverter it will be a G2 and there are 2 possible connector configurations for the meter connection wiring, i've attached the schematic below - you need to connect to RS485 A/B pins (pins 3&4) - these need to be connected to an RS485 adapter.
Many people use the RS485 USB adapter which is cheap and easy to connect to a computer, my preference is the waveshare device which you connect to over ethernet.
Re: Modbus integration using the usb port
Posted: Sun Aug 18, 2024 3:02 pm
by ehoconnor
Thank you for the clarification. That is very helpful.