External opening devices such as fire alarms, code locks, and key locks can be connected to the SigmaGate.
Connection Details:
Most devices should be connected to the “Front Open” input (between Front Open and GND) on the ScanMaster board inside the SigmaGate.
Fire alarms and latching trigger devices should instead be connected to the “Cleaning” input (between Cleaning and GND).
To interface with our system, use a volt-free, normally open contact that closes when the gate should open. Alternatively, an NPN open-collector transistor output capable of switching at least 50mA with a pulse width of at least 100 milliseconds can be used.
Any device that outputs a 12V signal can also successfully trigger the gate to open.
Note on NPN triggering:
An NPN signal is a grounding signal. Grounding the connection between the “signal” (Front Open) and GND will open the gate and keep it open for as long as the circuit remains grounded.
Example: Connecting an external push button to open the SigmaGate momentarily.
Description: When the push button is activated, it should send a pulse signal to the FRONT OPEN port on the ScanMaster board, which will trigger the SigmaGate to open momentarily.
Example: Connecting an external push button to put the SigmaGate in permanent open mode.
Description: When the push button is activated, it should send a latching signal to the CLEANING port on the ScanMaster board. This will trigger the SigmaGate to open and remain open until the push button is pressed again to release the signal and close the gate.
Example: Connecting a fire alarm panel to put the SigmaGate in permanent open mode in case of an emergency.
Description: When the fire alarm is activated, it should send a latching signal to the CLEANING port on the ScanMaster board. This will trigger the SigmaGate to open and remain open until the push button is pressed again to release the signal and close the gate. A signal in on the CLEANING port will override all other incoming signals.