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rollajarhead

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Posts posted by rollajarhead

  1. Posted

    I need to be able to control the systems through the Coaxitron receiver/drivers. The cost and inconvenience of running new cable is not something management wants to undertake. So what I need is someway to translate the commands issued from the GV-650 via the RS-232 and send them to the Coaxitrons via coaxial cable. I know I maybe looking for something that does not exist. However if this is the case then I will have to think about building a circuit to do it. Decoding the signals sent by the GV-650 should not be to hard, (I have one that can be hooked up and tested) the real problem is knowing how the signal is then encoded, i.e. pulse, modulation, frequency, any ideas would help.

  2. Posted

    Pelco use Coaxitron protocol. No control cables. Dome control is transmitting over same video cable to dome.

    But RG58 cable is 50oms. You must use RG 59 cable.

    Server not neccesary.

     

    shropna do I understand you correctly that GeoVision supports the coaxitron protocol?

     

    The system I have has the following components:

     

    GeoVision GV-650 ver. 6.11

    Pelco CX9024RX Coaxitron Receiver/Driver

    Pelco PT680-24SL Pan/Tilt

    Yoko 210Z Zoom Auto-Focus Camer

     

    I have four such setups excluding the GV-650.

     

    I am a beginner and have read and experimented with these systems for about six months now, unable to make the GV-650 control the pan/tilts and the cameras.

     

    What do I need to do to make it work?

  3. Posted

    The system is for monitoring a large parking area; we have experienced a number of vehicle break-ins as well as vandalism. The owners want to be able to prosecute the perpetrators so facial recognition is paramount.

     

    We will start out with four cameras and possibly be adding more as we progress, making scalability important. The first four cameras will be wireless, allowing us to reposition them to find the best observation points. I do know something of focal length, angle of view, and the importance of object distance. Using this is how I came up with a 6-60 mm lens. At present we wont be using PTZ though I see a need for it in the future. (It would be advantages if the system could sense motion then be able to PTZ onto the event. Is this possible?)

     

    The number of systems is unknown at this time, however if in the future other systems are needed then monitoring them from one location would be important. I should mention at this stage the system would not be monitored real time. In the event of theft or vandalism the stored data will be reviewed. We are therefore needing motion detection in the card as well as being able to select a zone or zones to monitor within the field of view.

     

    As for the need for technical support I would say yes. The questions I can envision at this time are setting the card up to perform the needed tasks, both in the above configuration as well as future modifications to the system. I do not believe we will need any on site assistance.

     

    Remote access is not an issue.

     

    If there are other items to be considered I would appreciate any input you may have.

     

    Thomas I would like to thank you for your time and advice, if you days are anything like mine time is precious commodity:!:

  5. Posted

    I am new to CCTV surveillance (two weeks), though I have been in the IT industry for fourteen years.

     

    The company I work for wants to put in a surveillance system. The cameras will be mounted inside to monitor outside activity. The distance from the camera to the focal point will vary, generally though the distance will be between 75 to 125 feet. The area to be monitored is well light. The glass in the windows is clear with no tinting. The most important parameter is facial recognition.

     

    At present I am looking at the following equipment

    Sony Super HAD with 420 TV lines and 0.8 lux

    6-60 mm DC auto iris varifocal lens

    Wireless video transmitter/receiver combo

    An Intel Pentium III 600 mhz

    ATI AGP video card 32 megabytes ram

    40 GB hard drive

    If there are other items of information needed please let me know.

     

    My question is what parameters do you judge a DVR card by.

     

    Frame rate? What is the recommended minimum rate?

    Compression? M-PEG4 vs. J-PEG (hard drive space can be increased if needed)

    Playback? Block vs. continuous

    And any others I have not thought of

     

    I would like to thank you for your assistance in advance.

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