Posts Tagged ‘ ptz’



Surveillance System for a Parking Lot

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Wednesday, August 19th, 2009

It may seem challenging to attempt to properly cover your parking lot with security cameras. Just using overview cameras to monitor an entire parking lot will usually not be enough. Though the overview cameras will have a general overview of the area, unless you invest in megapixel IP cameras you will get very little detail. IP cameras are certainly an option , but megapixel IP cameras capable of capturing useful detail are fairly expensive. You can easily expect to spend several thousand dollars per camera and then have to deal with the bandwidth and storage issues.

The most economical option is to supplement the overview cameras with a few pan-tilt-zoom (PTZ) cameras. The DVR can be programed to trigger a PTZ to cover an entrance or exit of a parking lot when another camera spots motion there. This would allow you to capture great detail as a vehicle or person enters or leaves the parking lot. also, the PTZ cameras can be programmed to remain on a tour while there is no activity in key areas to cover the rest of the parking lot. There is also the option of motion tracking PTZ cameras that are capable of following moving objects in the field of view. Using this combination of cameras can actually provide more usable footage with similar detail as a megapixel IP camera, only it will save you many, many thousands of dollars.

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The Basics of RS485 and PTZ Control

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Friday, August 7th, 2009

Almost every DVR has the ability to control a multitude of devices using the RS485 protocol. RS485 uses 2 wires to send and receive data to and from these devices. All the devices in an RS485 “network” are connected in parallel with one another. This is a very simple form of communication and relies mainly on the address that is given to each device.

The most common type of device that would be controlled in a security surveillance environment is a PTZ camera. Each PTZ camera on the system must be given a unique identification number. The method of setting this number varies from camera to camera, but normally this is accomplished either by setting a switch on the camera or through the on-screen display or OSD. At this point, you should also take note of the baud rate of the PTZ and the protocol that the PTZ uses (Usually Pelco-D).

Once each PTZ camera is given a unique ID, then the DVR can be configured. Each camera on the DVR that will be controlled will have settings that need to be configured. Just match up these settings with the settings that are configured in the camera. At this point, you should be able to control your PTZ.

There are many other types of devices that can be controlled using RS485. The setup is identical for those devices as well.

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