[Solved] Connection of FAAC 740 limiters to Sonoff SV and integration with Satel CA6

Drive faac 740 + sonoff SV
1. what software to upload to make the two limiters work.
2. how to connect to the original limiters
The limiters on the 748D control panel drive board are given a supply of 18.5V, the current flowing in the active state is short-circuited to ground with 20mA (relays are out).
Is it possible to connect these limiters directly to the IO inputs. ESP8266 The maximum current that can be drawn from a single GPIO pin is 12mA.
Theoretically using a 30K resistor the maximum current at this voltage would be under 10mA. The theoretical voltage does not matter as long as it is above the high state.
If this solution does not work then I would consider using a PC817 optocoupler but separating the circuits with a common ground?


similar problem
Using sonoff sv for notification, control panel satellite (CA6).
Central on low current outputs puts out 10.85V shorted to ground in inactive state,
1. what should I upload in order to be able to receive notifications from as many inputs as possible and to control the outputs.
Is it possible to separate the inputs in this case too.

Unless you have other ideas for wifi notification from CA6 control panels.

............................................................................
Notification .


Please see tutorials, featured topics, articles, on security systems such as intercoms, gate and barrier automation, alarm systems, cameras, access control:
Guides on. Security Systems .

If you do not find an answer to your question in the above topics, please visit the forum:


We also encourage you to visit the General Guides section, where you will find material from the other sections of the forum, including for those starting out in electronics:
General Guides. .