Brickcom Software Users Manual For Firmware release V3.2.x.x - Manual (Page 55)

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Digital Output (DO)
The DO socket allows the IP camera to send output to an external device. While executing the
DO notification action, the IP camera drives voltage on the connected DO wire to the
triggering voltage level for X number of seconds. The connected external device will then be
triggered for X number of seconds.
Triggered Voltage Level - OPEN or GROUND
Users should select the option according to the specification of their external device.