Dahua Technology K Series, Quick Start Manual, Page: 12 / 14

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Mode A:
Level application. Alarm output high and low level, alarm output is OC; it needs to increase pull-up
resistance externally to work normally. Max external pull-up level is 5V, max port current is 5mA. After
external pull-up resistance is increased, the default of output signal is high level (external pull-up
voltage), and it switches to low level when there is alarm output (when the working current is 5mA,
output voltage is less than 0.8V).
Mode B:
Switch application. Alarm output is used to drive external circuit, max current is 50mA, max voltage is
12V (it can be applied together with alarm siren, acousto-optic alarm siren HC103) it is advised to add
a relay if it is beyond the value.