[nehz]

Would you have the RJ45 pinout too? Thanks!

[FLT8]

This is from my earlier notes, hope it helps some.

  Pin 1: RS422 +/B
  Pin 2: RS422 -/A
  Pin 3: ? - appears to be unused; connected to unpopulated pad on PCB
  Pin 4: GND
  Pin 5: ~14.2v DC unloaded
  Pin 6: GND
  Pin 7: ?
  Pin 8: ?
  Shield: GND

Note: the RS422 protocol has a basic bus arbitration built-in to allow both ends to communicate. The control unit sends <U>Ping</U=xx> messages, after which it opens a slot for the Tablet to communicate back to it. At least on my system xx represents a simple CRC value that can be used to validate message authenticity. I haven't seen any AES encryption in use, messages I've seen are all plaintext, maybe the AES encryption was introduced in a later revision.

[binary_slinger]

Wouldn't RS422 need 2 TX and 2 RX?

[gstar]

No, sorry - I may be able to buzz one out of the a/c controller later on.

I do, have 2 spare USB-C to JST-SH adapters that suit the round advantage air circuit board if anyone wants one (Perth, Free). Email in profile.