Axis Q74 Guia De Instalacion página 19

information about regulatory requirements, see Electromagnetic Compatibility (EMC) on
page 4.
BNC Connector
Each video input is terminated using a coax/BNC connector.
Connect a 75 Ohm coaxial video cable; the recommended maximum length is 250 m (800 ft).
Note
75 Ohm video termination can be enabled/disabled for the video input through the
product's web page at Video & Audio > Camera Settings > Video termination. Video
termination is enabled on factory default. If the product is connected in parallel with other
equipment, for optimum video quality, it is recommended that video termination is enabled
only for the last device in the video signal chain.
I/O Connector
Use with external devices in combination with, for example, tampering alarms, motion detection,
event triggering, and alarm notifications. In addition to the 0 V DC reference point and power (DC
output), the I/O connector provides the interface to:
• Digital output – For connecting external devices such as relays and LEDs. Connected
devices can be activated by the VAPIX® Application Programming Interface, output
buttons on the Live View page or by an Action Rule. The output will show as active
(shown under System Options > Ports & Devices) if the alarm device is activated.
• Digital input – An alarm input for connecting devices that can toggle between an open
and 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
under System Options > Ports & Devices).
6-pin configurable terminal block
Function Pin
1
0 V DC (-)
2
DC output
AXIS Q7424-R Mk II Video Encoder
Notes
Can be used to power auxiliary equipment.
Note: This pin can only be used as power out.
19
Specifications
0 V DC
12 V DC
Max load = 125 mA
EN