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from the Automation List department...
Pelco D/P Protocol
Engineering topic
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Posted by Max on 12 December, 2004 - 11:31 pm
I need to know the Pelco D/P Protocol. I would like to write a sw for control my PTZ camera with a RS485 Pelco D/P protocol drives. Any comments will be appreciated.
Thanks.

Posted by Meir Saggie on 13 December, 2004 - 3:51 pm
I got this with Google:
http://www.codeproject.com/useritems/PelcoPDinC.asp

Meir

Posted by gmancoder on 8 November, 2005 - 10:46 pm
Here's a link to a site I found with both Pelco P and D protocols. They also have a Windows based control panel and a great (free) Debugging tool that shows the code you are sending to the Pelco Device.

GmanCoder

http://www.roboticcircuits.com/Speed%20Domes%20Controllers.htm

Posted by Anonymous on 11 November, 2005 - 12:50 am
Pelco P and Pelco D from the download list
http://www.roboticcircuits.com/Download.htm

Posted by gordon on 17 December, 2005 - 12:16 am
Try Robotic Circuits Pelco Compatible Control Panel. It really works well. They give it away free if you buy one of their RS-485 adaptors.

Here's the link on how to program it.
http://www.roboticcircuits.com/Downloads/SD-TroubleShootCP.pdf

Posted by Jim Cleary on 17 August, 2006 - 11:32 pm
Try this website: http://www.rs232analyzer.com, they provide in depth explanation and example of Pelco D/P protocol and the free terminal to play with Pelco D/P PTZ cameras.

Posted by gmancoder on 11 November, 2005 - 11:05 pm
Sorry, forgot the other link...
http://www.roboticcircuits.com/Download.htm

Posted by Mohammed Mehanna on 10 January, 2005 - 6:52 pm
D Protocol is a type serial protocol of sending/receiving data from the controller to camera for the pan /tilt and zoom functions. In D protocol separate data cable is required rather than the cable for video.

P Protocol is a type of superimposing the data signal over the video signal in the same cable (i.e. in case of coaxial cable transmission same coaxial cable will be used to carry the data signal along with the video without additional cables).

Posted by Adam Myhre on 28 September, 2006 - 9:25 pm
You are right about D Protocol but P and D are similar, both needing a separate control wire. What you think P Protocol is actually is called Coaxitron. Coaxitron sends the control over the coaxial cable. D and P differ on baud rates and max units able to control but are pretty similar. Coaxitron control needs both a coaxitron able camera plus a coaxitron able controller like a CXT or a MXB with coaxitron capability. Pelco's new network video recording system Endura also uses coaxitron. As you can probably tell Coaxitron is a Pelco thing, i'm not sure if any other manufacturer uses it. The only road block with it is that it can't send control through any active transmission system like a Signal Amplifier or a Powered UTP unit. Hope this helps.

Posted by Jim Cleary on 18 August, 2006 - 12:29 am
Try this link http://www.232analyzer.com/RS232_Examples/CCTV/Pelco_D_Pelco_P_Example s_Tutorial.HTM

Posted by Anonymous on 18 December, 2006 - 2:24 pm
To get more info about the Pelco D protocol, just get the spec for it from Pelco. If you email techsupport@pelco.com with your name, company, address (real and email) along with your application, they will send you the spec.

Posted by Eric Hamilton on 3 June, 2007 - 12:22 pm
Hi
I work at Pelco and am very familiar with our D and P protocols. If any one has any questions about them, please e-mail me at ehamilton@pelco.com

Posted by Eric Hamilton on 17 July, 2007 - 9:13 pm
I work at Pelco and know D and P Protocols quite well. If any one has any questions about either protocol, please e-mail me at ehamilton@pelco.com

Posted by reuben on 5 September, 2007 - 11:59 pm
I wish to know how to configure a ptz camera with Pelco P or D protocols, and their advantages over normal connection.

Posted by Faustino Galan on 16 December, 2007 - 5:48 pm
I have a system with 2 PTZ cameras, 2 DVRs and a non Pelco keyboard. Is there a way that I can have one of the PTZ go to a preset at 2pm every day for 10 min and then return to its home.

Thanks
Charly
fgalan@fjcsecurity.com

Posted by Eric Hamilton on 24 January, 2008 - 12:49 am
E-mail me at Pelco (ehamilton @ pelco. com) and I'll try to answer this.

Posted by Steven on 1 March, 2008 - 12:08 pm
If you are looking for USB to RS232/RS485/RS422/TTL converters, check out this site: http://www.usb-serial-adapters.com, or http://www.serial-converter.com

Posted by Guillet Yves on 29 March, 2008 - 12:08 am
Hi,

I've integrated in a C# program the class Pelco D and Pelco P; as most I've read, they don't work: fault is the calculation of the checksum which uses ^(Xor) instead of + (Plus /Or).

Now all is OK.

Best regards

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