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alekslt / HANToMQTT

ESP32/ESP8266 HAN (M-Bus Metering Data) to MQTT
MIT License
35 stars 5 forks source link

M-Bus TTL Adapter? #6

Open larsenglund opened 3 years ago

larsenglund commented 3 years ago

Hi, great project! I can't find any info on the M-Bus TTL Adapter, do you have a source where it can be purchased or schematics so it can be built?

Thanks! /Lars

DaniEll-AT commented 2 years ago

Hi! Any news according the M-Bus TTL Adapter?

oddstr13 commented 2 years ago

I'm in the research phase myself, so take the following with a grain of salt.

Looks like the one pictured in the readme looks like it's a FC722 based adapter, and can be found on aliexpress, ebay or similar.

TSS721A based adaptors are also an alternative. The circuit I most often see when searching around looks like it's based on this optoisolated one from the datasheet; image

Search for mbus slave, you want something similar to these:

FC722 image

TSS721A image

There are RS485 versions around too, make sure you pick the TTL serial (3.3/5V RS232) version.