JetDmLt

Have similar issue. In manual for some deye models found the pinout of parallel port… and it has: Pin 1,2 / 7,8 - sync, gnd (two pairs duplicate) Pin 3,6 / 4,5 - CAN H,L (two pairs duplicate). Tested it with oscilloscope - Deye realy has two duplicated CAN pairs with 50kbaud and two duplicated pairs (sync/gnd) of signal with 2Vpp and approximately 20kHz with some smaller peaks and higher frequency and softer slopes more characteristic for analogue signal. So it looks like not only CAN works there but also some “physical” synchronization. I also emailed with Deye support and they suggested using GCAN 208-1 CAN-optical converters. We tried - it didn’t work. Looks like Deye support also didn’t know they have extra synchronization line in their parallel system (hysterical laugh). Another reason for the theory above is that we sniffed the can signal and packets travel both ways, but invertors go to F29 error. Done small experiment and connected only CAN pairs on short distance without synch pairs - same result. Gonna try using active video balun’s (amplifier for balanced line).