AXIS P8221 Installation Guide Page 15
ENGLISH
I/O terminal connectors A and B - Used in applications for e.g. event triggering and alarm
notifications. In addition to an auxiliary power and a GND pin, each I/O terminal connector has 4
pins that can be configured as either input or output. These pins provide the interface to:
• Digital output – For connecting external devices such as
relays and LEDs. Connected devices can be activated by
VAPIX® Application Programming Interface (API), by output
buttons on the Live View page or by an Event Type. The
output will show as active (shown under Ports & Devices >
I/O Ports) 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 Ports & Devices > I/O Ports, and, if enabled, on the Live View
page).
Function Pin Notes Specifications
GND 1 Ground
3.3 V DC
Power
2 Can be used to power auxiliary equipment.
Note: This pin can only
be used as power out.
Max load = 250 mA
Configurable
(Input or
Output)
3-6 Digital input – Connect to GND to activate, or
leave floating (unconnected) to deactivate.
Min. input = -40 V DC
Max. input= +40 V DC
Digital output – Uses an open-drain NFET transis-
tor with the source connected to GND. If used with
an external relay, a diode must be connected in
parallel with the load, for protection against volt-
age transients.
Max. load =100 mA
Max. voltage = + 40 V DC
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