Q:What is the meaning of the camera function heartbeat?

In the previous case, the implementation steps are as follows: 1, in a unified authentication system to open a "heartbeat" thread, the timing of the implementation of a visit A system operation, access to the A system S interface; 2, A system to achieve an interface S, Function for each access to an access request, then record a record of access, for example: 2009-3-18 fw 3, System A also need to also open a "heartbeat" thread, not separated by a certain time, access to the interface S is done Visit the record to see if the last record of the old record logo, if not, then prove that the single point of the system has the latest "heartbeat" came, its function is no fault.

Q:What is the black box that monitors the camera connection?

DVR is usually used analog (DVR) and network (NVR) two, look at the interface behind the fuselage can distinguish. DVR according to a few video input will have several BNC input interface, NVR is not.

Q:Home pinhole wireless surveillance camera where to sell? How much is the miniature camera?

Object-oriented is the decomposition of the composition of the transaction into the various objects, the purpose of the object is not to complete a step, but to describe a thing in the whole problem-solving steps in the behavior.

Q:Night to monitor the infrared light is not bright because it is not open monitoring?

2: the camera where the environment is too bright, surrounded by incandescent or other light source, the camera will not enter the night mode, it will not open the infrared light

Q:What is the number of millimeters that monitor the camera?

And then the zoom is generally wide angle is more than 90 degrees above the normal is about 30 degrees long focal length is less than 20 degrees

Q:What is the number of lines that a surveillance camera needs to use?

2, video cable (transmission video signal, syv75-3, syv75-5, syv-75-7 these three are the most commonly used)

Q:Monitor the video recorder has been unable to work what is the reason

VCR hardware is damaged. This situation is recommended to contact the dealer for the repair.

Q:Monitor the camera in the monitor screen appears in the camera 001 what meaning

One is the name of the video recorder, you can delete the number from the VCR menu, channel settings.

Q:How to use the network cable to connect the surveillance camera?

2, some camera is a digital camera, direct use of cable digital transmission of video, cameras and video recorders are connected through the network cable on the switch, are transmitted through the network video.

Q:Monitor the use of the camera

Depends on what you use, the use of more than 1. to prevent the occurrence of traffic accidents. For example, on the highway if there is no monitoring of the camera monitoring, some people will drive speeding, resulting in traffic accidents, which will