Recent content by Jim Evans

PS: in the second picture, the first, higher-amplitude packet is the transmission from the heater. The second, lower-amplitude packet is from the remote.

The two wires have 22VDC on them. The heater unit blindly transmits a 20 bit packet 5 times a second at about 500bps burst. Just roughly looking at the bit patterns on the scope, I'm guessing it alternates between two types of packets. The remote, if connected, responds after every other...

I have two Takagi JRs used for hydronic heat, and I just received a remote control unit for one of them. I'm thinking it's definitely worth my time to put a 'scope on it and check out the protocol and try to roll my own simple remote with an Arduino, rather than pay $80 for the second remote...