Good time of day,
I’m trying to clone access controller using existing reading devices which emulate DS1990 behavior using 1-Wire bus. It’s obvious that OneWire library should be used in this case. However, I’m facing a problem which I don’t really get.
According to docs and data from logic analyzer, the first byte of Read ROM command response should be 0x1, but I’m getting variable values instead, mostly being 0xAB. I’ve checked my code with physical DS1990 and they work without issues, but not on the device I’m working with now.
The screenshots of logic analyzer results with original circuit and mine are attached