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VL-SWD272BX/SWD272CX/SWD272CX1/SWD272AZ/VL-WD613CX/VL-WD613CX1
Fig. 4.2. Call signal from Door station
Communication to Extention monitor:
When the call is detected by Monitor station.
The Main CPU command of Monitor station is modulated to ASK signal and sent to Extention monitor.
This ASK signal is demodulated by Extention monitor.
Extention monitor detects this call and then rings.
Then LCD of Extention monitor is turned ON.
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