It's some days I'm trying to understand how this protocol works without any success. I need some help.Basically I'm sniffing an UART signal. 115200 8N1 I understood what's happening under the hood of the protocol. It is based on xor. Here are a couple of examples:A0 82 00 01 02 14 81 6A 76 A0 82 00 02 02 14 81 6A 75 As you can see the 01 to 02 change is reflected to 76 to 75. The data is xor-ed nibble to nibble. Here's come the problem. The day after I turn on the system and I made another acquisition. Surprise the Checksum change. Apparently also the way the crc is calculated differ because not the bit to change are 2 and 3 of last byte.the data changes from D0 => DC while before it was from 76 to 75.A0 82 00 01 02 14 81 14 D0 A0 82 00 02 02 14 81 14 DC Actually, I discovered that in the full transmission I have a single message that is changing every time. It is a 5 byte message in the format:A0 07 0B 40 44A0 07 EA 1B 58The 2 messages just posted was taken from the 2 transmission taken before.I think that the two A0 messages sends some type of CRC feed and some way for calculating it. Second strange thing, I don't understand what kind of CRC is applied in the first message. It looks strange that the message who need to fix a CRCc base seed is non CRC'ed. Do somebody have some idea on what protocol could be? Something similar?
CRC with OR but seed differ every time the protocol restart
serial communication;protocol