Page 14 AXIS 216FD/216FD-V/216MFD/216MFD-V Installation GuideUnit connectorsNetwork connector - RJ-45 Ethernet connector. Supports Power over Ethernet. Usingshielded cables is recommended.Power connector - Mini DC connector. 5.1V DC, max 3.8W. See product label for ±connection.Audio in - 3.5mm input for a mono microphone, or a line-in mono signal (left channel isused from a stereo signal).Audio out - Audio output (line level) that can be connected to a public address (PA) systemor an active speaker with a built-in amplifier. A pair of headphones can also be attached. Astereo connector must be used for the audio out.I/O terminal connector - Used in applications for e.g. motion detection, event triggering,time lapse recording and alarm notifications. It provides the interface to:• 1 transistor output - For connecting external devices such as relays and LEDs.Connected devices can be activated by AXIS VAPIX AP, output buttons on theLive View page or by an Event Type. The output will show as active (shownunder Event Configuration > Port Status) if the alarm device is activated.• 1 digital input - An alarm input for connecting devices that can toggle betweenan open and closed circuit, for example: PIRs, door/window contacts, glass breakdetectors, etc. When a signal is received the state changes and the input becomesactive (shown under Event Configuration > Port Status).• Auxiliary power and GNDFunction Pin number Notes SpecificationsGND 13.3V DCPower2 Can be used to power auxiliary equipment.Note: This pin can only be used as power out.Max load = 50mADigital Input 3 Connect to GND to activate, or leave floating(or unconnected) to deactivate.Must not be exposed tovoltages greater than10V DCTransistorOutput4 Uses an open-collector NPN transistor withthe emitter connected to the GND pin. If usedwith an external relay, a diode must be con-nected in parallel with the load, for protectionagainst voltage transients.Max load = 50mAMax voltage = 24V DC(to the transistor)