Flashed last firm KCS_KC868_A2_V2.2.19.bin, no problem, everithing works well.
Buyed Tuya License (waiting reception...)
But I think I must change my plan....
I will power the board with a separate PSU 12vDC, then I can`t use de D1 1 and D2 2 as alarm jump notice and alarms status, cause the alarm board works in the OUT1 and OUT2 with ground or not ground for change status, taking the ground of the alarm board.
It's possible to input +12v in D1 and D2? or only works shorting with ground? When +12v inputs on DI 1 - > alarm start (for example)
If possible, how configure the parameter Input on board?
A2 board digital input can use by 12v, but this is logical FALSE, short with GND , just DI=0v that is logical TRUE. if you MUST want use 12V for tigger, you can add a extend relay to convert to dry contact signal.
By connecting the negative terminal of the KC PSU to the negative terminal of the alarm board, you can short D1 and D2 to negative to activate Digital Inputs
In the end, I connected the KC directly to the alarm's backup battery, and everything works fine. The digital inputs are shorted to ground to activate.
The KC fulfills my need: the ability to arm and disarm the alarm from anywhere. Therefore, I can also know at any time whether the alarm is armed or not (in case I forget whether I armed it when I left home).
And of course, if the alarm is triggered while I'm not home, I receive a notification on my phone.