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Type 3:
Barrier open/close signal common = +12V~+24V (V+).
Output signal type of barrier arm close position: Active low.
When barrier arm reach lowest (close) position: Down Position output signal
+5V~+24V -> 0V.
Type 4:
Barrier open/close signal common = GND (0V).
Output signal type of barrier arm close position: Relay output N.C.
When barrier arm reach lowest (close) position: N.C. -> Open.