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Hi,

I'm looking for some one that can help me with the next question, i have a PCB with a kind of bus communication (i think something over RS485) line on it (see picture) only i want to know if it's possible to monitor on this line.
Only i don't know what this is for kind of signal.

Looking at the IC it's HBS.
datasheet.eeworld.com.cn/pdf/MITSUMI/15 ... MM1192.pdf
Home Bus System.. a japanese standard.

Not much that I can find on it really. Protocol information etc etc...

What's it used for? Air Conditioning or something?

Cheers,

Timo

Hi Timo,

That is correct it's for a AC unit.
And i want to try if it's possible to watch in that line.

phoenixb wrote:i want to try if it's possible to watch in that line.

I know the question is a few years old, but it is possible to watch the data on the HBS line using an MM1192-based circuit and an Arduino. More information on the protocol, schematics and software to do so can be found on https://github.com/LenShustek/M-NET-Sniffer (Mitsubishi M-NET, analog circuitry) and https://github.com/Arnold-n/P1P2Serial (Daikin P1/P2, Arduino and MM1192 circuitry).