47AXIS 210/211/211A - The I/O Terminal ConnectorThe I/O Terminal ConnectorPinout and InterfaceThe 4-pin I/O terminal connector provides the interface to:• 1 transistor output• 1 digital input• auxiliary power and GNDThe terminal connector is used in applications for e.g. motion detection, event triggering,time lapse recording, alarm notification via email, image storage to FTP locations, etc.• Input - for connecting e.g. a doorbell. If the doorbell is pressed, the state changesand the input becomes active (shown under Event Configuration > Port Status).• Output - connects e.g. an alarm device that can be activated by Output buttonson the Live View page, or by an Event Type. The output will show as active(Event Configuration > Port Status) if the alarm device is activated.Pin Function Description4 Transistor Output With a maximum load of 100mA and a maximum voltage of 24V DC, thisoutput has an open-collector NPN transistor with the emitter connected to pin1 (GND). If used with an external relay, a diode must be connected in parallelwith the load, for protection against voltage transients.3 Digital Input Connect to GND to activate, or leave floating (or unconnected) to deactivate.2 Auxiliary DC Power Input 7-20 VDC/min 7W. Electrically connected in parallel with the PS-K powerconnector, this pin provides an auxiliary connector for mains power to the unit. Ifthe unit is powered via this pin, a fuse should be used (rating: 1A Slow).This pin can also be used to power auxiliary equipment, max 100mA, but note thatthis is not possible when the AXIS 211/211A is powered by PoE.1 GNDTerminal connector. Note that the pinsare numbered 1-4, right to left.DC-Iris control cable(AXIS 211/211A only).4 3 2 1Audio Output/Input(AXIS 211A only).