Connecting Basics 23Please make sure the front-end device has soundly earthedImproper grounding may result in chip damage.4.3.1 Introducing Alarm PortThe alarm input ports are dependent on the model you purchased.Icon Description1，2，3，4，5，6，7，8，9，10，11，12，13，14，15，16ALARM 1 to ALARM 16. The alarm becomes active in low voltage.NO1 C1, NO2 C2,NO3 C3, NO4 C4 There are four groups of normal open activation output (on/off button).NO5 C5 NC5, There is one group of normal open activation output (on/off button).CTRL 12VControl power output of the 6th alarm output channel. Voltage current:500mA.When there is an alarm output, close the power output.When the alarm is cancelled, open the power output.+12V Rated current.Voltage current: 500mA.Ground cable.485 A/B485 communication port. They are used to control devices such asdecoder. 120Ω should be parallel connected between A, B lines if thereare too many PTZ decoders.T+,T-,R+,R-Four-wire full-duplex RS485 port.T+ T-: output wire.R+ R-: input wire.4.3.2 Alarm InputPlease refer to the following figure for more information. Grounding alarm inputs which includes Normal open and Normal close type. Please parallel connect COM end and GND end of the alarm detector (Provide externalpower to the alarm detector).
