Page 6 AXIS 216FD Installation GuideI/O terminal connector blockLED indicatorsPin Function Description4 TransistorOutputWith a maximum load of 50mA and a maximum voltage of 24V DC, this output has anopen-collector NPN transistor with the emitter connected to the GND pin. If used with anexternal relay, a diode must beconnected in parallel with the load, for protection against voltagetransients.3 Digital Input Connect to GND to activate, or leave floating (or unconnected) todeactivate.2 3.3V DC Can be used to power auxiliary equipment, max 50mA.1 GNDLED Color DescriptionNetwork Green Steady for connection to 100 Mbit/s network. Flashes for network activity.Amber Steady for connection to 10 Mbit/s network. Flashes for network activity.Unlit No connection.Status Green Shows steady green for normal operation.Note: The Status LED can be configured to be unlit during normal operation, or to flash only whenthe camera is accessed. See the online help files for more information. Go to Setup > SystemOptions > LED settingsAmber Steady during startup, reset to factory default or when restoring settings.Red Slow flash for failed upgrade.Power Green Normal operation.Amber Flashes green/amber during firmware upgrade.