Hi, I have split AC Panasonic. Indoor and outdoor set. I tried to sniff data as well. It seems so the communication is the same or very similar. I had connected TTL to RS232 directly on MCU. Sniffed frames were 14 bytes as well. Last byte is maybe CRC. Voltage level between indoor and outdoor unit (1 wire) seems to be the same as at GREE. Pls, do you have somebody basic electrical wiring, how to connect to this wire and sniff both communication via TTL (indoor and outdoor)? First step. Second step – wiring for the sending data to outdoor unit via TTL. Thanks in advance.