AXIS 212 PTZ/-V Installation Guide Page 13ENGLISHUnit connectorsNetwork connector - RJ-45 Ethernet connector. Supports Power over Ethernet. Using shieldedcables is recommended.Power connector - For connection of the PS-H power adapter (included).Audio in - 3.5mm input for a mono microphone, or for line-in mono signal (left channel is usedfrom a stereo signal).Audio out - Audio output (line level), that can be connected to a public address (PA) system or anactive speaker with a built-in amplifier. A pair of headphones can also be attached. A stereoconnector must be used for the audio out.I/O terminal connector - Used in applications for e.g. motion detection, event triggering, timelapse recording and alarm notifications. It provides the interface to:• 1 transistor output - For connecting external devices such as relays and LEDs. Connecteddevices can be activated by the VAPIX Application Programming Interface (API), by the out-put buttons on the Live View page or by an Event Type. The output will show as active(shown under Event Configuration > Port Status) if the alarm device is activated.• 1 digital input - An alarm input for connecting devices that can toggle between an openand closed circuit, for example: PIRs, door/window contacts, glass break detectors, etc.When a signal is received the state changes and the input becomes active (shown underEvent Configuration > Port Status).• Auxiliary power• GNDI/O terminal connectorPin Function Description4 TransistorOutputWith a maximum load of 50mA and a maximum voltage of 24V DC, this outputhas an open-collector NPN transistor with the emitter connected to the GNDpin. If used with an external relay, a diode must beconnected in parallel with the load, for protection against voltagetransients.3 DigitalInputConnect to GND to activate, or leave floating (or unconnected) todeactivate.2 3.3V DC Can be used to power auxiliary equipment, max 50mA.1 GND