Axis Communications 241Q user manual I/O terminal connector, Pin Function Description

50AXIS 241Q/241S - Unit connectors

The I/O terminal connector

This section describes the pinout and interface support provided by the 12-pin I/O terminal connector, which includes:

•4 digital transistor outputs

•4 digital inputs

•an RS-485 interface

•auxiliary power and GND

The terminal connector is used in applications for motion detection, event triggering, time lapse recording, alarm notification via email, and image storage to FTP locations, for example.

•Inputs - Example: a push button. If the button is pressed, the state changes, and the input will be active (shown under Event Configuration > Port Status).

•Outputs - Example: an alarm device that can be activated from Output buttons on the Live View page or as an action to an Event Type. The output will show as active (in Event Configuration > Port Status), if the device is activated.

Pin	Function	Description
1	Auxiliary DC Power Input	7-20 VDC/min 8W. Electrically connected in parallel with the power
		connector, this provides an auxiliary connection for mains power to
		the unit. If the product is powered via this pin, use a fuse (rating: 1A
		Slow).
		This pin can also be used to power auxiliary equipment, 9vDC max
		100mA.
2	GND	Ground
3	Digital Input 1	Connect to GND to activate or leave floating (or unconnected) to
		deactivate.
4	Digital Input 2
5	Digital Input 3
6	Digital Input 4
7	Transistor Output	With a maximum load of 100mA and maximum voltage of 24V DC, this
		output has an open-collector NPN transistor with the emitter
8	Transistor Output
		connected to pin 2 (GND). If it is to be used with an external relay, a
9	Transistor Output
		diode must be connected in parallel with the load for protection
10	Transistor Output
		against any voltage transients.
11	RS-485 - A (non-inverting)	A half-duplex RS-485 interface for controlling auxiliary equipment,
		PTZ devices, for example.
12	RS-485 - B (inverting)

The Axis video server includes one (green) 12-pin connector block. Connect input/output devices to this block:

1.Loosen the corresponding screw on top of the pin on the connector block (see the table above to determine which pin to use).

2.Push the cable into the connector block and secure it by fastening the screw.

3.Once all devices are connected, connect the connector block to the video server’s terminal connector.