I just finished reverse engineering the Fujitsu AR-RY16 remote control used on my Fujitsu mini-split air conditioner. The remote displays temperature, operating mode, fan speed, sleep and timer mode as well as the timer and sleep values and swing mode. Except for three discrete codes, the remote sends a full set of state information even when only one parameter is changed. I.e. if you change the temp, the remote sends temp, operating mode, fan speed, swing mode, etc. even if none of these have changed.
Here is a document I put together describing the format:
ercoupe.com/audio/FujitsuIR.pdf
The three discrete codes are:
Power Off
Step Horizontal Vane Position
Step Vertical Vane Position
All other changes require a 16 byte command to be sent.
The first 8 bytes are fixed (I assume one of them changes if you want to address more than one air conditioner but I did not open the remote to see which one).
The last byte is a checksum that sums bytes 8 through 16 to zero mod 256.
The rest are as shown.
David
Last edited by dabrams on November 10, 2010 10:59.