8 ms·
Oh, and you just need one of these and a TTL to RS422 converter off aliexpress to replicate the interface: https://www.aliexpress.com/item/1005005918675239.htm
by gstar 2y ago
Oh, and you just need one of these and a TTL to RS422 converter off aliexpress to replicate the interface:
https://www.aliexpress.com/item/1005005918675239.html https://www.aliexpress.com/item/1005005918675239.html
The connectors on the small RJ45 daughter board are JST-SH 1.0
The yellow lead puts out 4.2v to replicate a Li-Ion battery (as far as I can tell). You can ignore this.
Red is positive
Black is negative
Green is usb d+
Blue is usb d-
- ranebo 2y agoThis is all fantastic info. I have included the details and a link to these comments at the bottom of the post. Great work!
- Nursie 2y agoHey - As the owner of a similar system I have a question for you - do you use their phone app to control your system from your phone in/out of the house, and did it still work after this?
- ranebo 2y agoI use the home assistant plugin with it personally, but I have tried the apps and they still work fine both locally and remote.
- Nursie 2y agoCool, that's all I needed to know, I'll be following in your footsteps at some point, thanks for taking the leap and doing all this :) Now back to connecting an orange-pi zero to the petcube cam someone bought me for Christmas. I've found TTL pins on there and I want to know what's going on...
- saylisteins 2y agoTiny QOL change without too much work, you could install something like teamviewer on the tablet, and now you're able to control your AC remotely from your PC, your phone, or anywhere!
- selcuka 2y agoThe MyAir (or e-Zone) app can already be accessed remotely. You install the app on your phone and pair it with your system by connecting to the same LAN. After the initial pairing it can be used from everywhere.
- emilfihlman 2y agoUsing which reverse service, though?
- selcuka 2y agoFrom memory it connects to Firebase, possibly using the Realtime Database to sync state.
- lucioperca 2y agoTip: Instead of soldering I use splicing connectors with levers for testing stuff like this out. For example: https://www.wago.com/de-en/c/installation-terminal-blocks-and-connectors https://www.wago.com/de-en/c/installation-terminal-blocks-an...
- dt3ft 2y agoWago has great stuff.
- nehz 2y agoWould you have the RJ45 pinout too? Thanks!
- gstar 2y agoNo, 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.
- FLT8 2y agoThis 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 2y agoWouldn't RS422 need 2 TX and 2 RX?
- upofadown 2y agoNormally, yes. Perhaps this could be more properly termed RS-485 operating in 2 wire (half duplex) mode: * https://en.wikipedia.org/wiki/RS-485 https://en.wikipedia.org/wiki/RS-485
- gstar 2y agoI have something slightly different 1 is RS422 B 2 is RS422 A 3 & 5 - GND 4 & 6 - VCC Not sure what 7 and 8 do.