If you press button 2 (02h), the checksum seems to increment by 1, so B2h. This is from addr10 (doesn't seem to send source addr tho), to addr10 (the panel). STX Start of Text (Used here to go to new line?)ĭrawing three asterisks (2Ah) to the display: RS485 Address of device being addressed, keypad at addr10 The galaxy manual is not hugely useful regarding how the addresses lay out - they don't show the full address. MAX4 Reader (not actually present but the panel thinks it is? maybe because keyprox keypad at addr10 also uses this?) Keypad (beeps if you address a door open command to "Max 0" addr?)Īppears to be the alarm panel itself/it's cpu/whatever. The Galaxy Addr is a weird one - it looks like the actual RS485 address, but truncated. We used a MAX485 and FT232R together to get data. Python script to dump data from the RS485 bus, used in figuring out what happens. Screenshot from Galaxy manual showing their RS485 "addresses" Sigrok capture, apply a uart filter at 10000 baud(lolsamplerate),8bits no parity. The last bit in each packet appears to be a checksum, and the first bit is always the device address being addressed. It runs as 9600 baud, 8 bits, no parity, 1 stop bit, so pretty default. Galaxy RS485 protocol reverse engineering Galaxy RS485 protocol reverse engineering This is very much a work in progress.
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