IC Realtime AVR-1404 User Manual

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IC Realtime AVR-1404 User Manual Manual pdf 27 page image

18c. Alarm input needs the low level voltage signal.d. Alarm input mode can be either NC (normal Open) or NO (Normal Close)e. When you are connecting two DVRs or you are connecting one DVR and one otherdevice, please use a relay to separate them,2. Alarm outputThe alarm output port should not be connected to high power load directly (It shall be lessthan 1A) to avoid high current which may result in relay damage. Please use the cocontactor to realize the connection between the alarm output port and the load.3. How to connect PTZ decodera. Ensure the decoder has the same grounding with DVR, otherwise you may not controlthe PTZ. Shielded twisted wire is recommended and the shielded layer is used to connectto the grounding.b. Avoid high voltage. Ensure proper wiring and some thunder protection measures.c. For too long signal wires, 120Ω should be parallel connected between A, B lines on thefar end to reduce reflection and guarantee the signal quality.d. “485 A, B” of DVR cannot parallel connect with “485 port” of other device.e. The voltage between of A,B lines of the decoder should be less than 5v.4. Please make sure the front-end device has soundly earthed.Improper grounding may result in chip damage.3.7.1 Alarm Input and Output Details3.7.1.1 AVR-1404/AVR-1408/AVR-1416The interface is shown as in Figure 3-1.Figure 3-1You can refer to the following sheet for detailed information1，2，3，4，5，6，7，8，9，10，11，12，13，14，15，16ALARM 1 to ALARM 16. The alarm becomes active in low voltage.1-NO C，2-NO C, There are three groups of normal open activation output (on/off