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Introduction |
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Supported
Operating Systems |
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Software features |
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Applications: Serial port
monitor |
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Applications: Serial port terminal |
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Applications: Real-world examples |
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Differences between
FREE and the Registered Version |
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Ordering
Information |
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Software Activation |
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Applications: Real-world examples |
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(Pelco-D |
Pelco-P) |
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Pelco-D Protocol Tutorial / Examples
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Pelco-D is the popular PTZ camera control protocol used in the CCTV industry
(Click here to visit Pelco's
website).
This page will explain the following topics in details:
1) The format of Pelco-D
2) How to calculate the checksum byte by using 232Analyzer
3) Pelco-D command string examples
4) How to use 232Analyzer to control the Pelco-D cameras
5) Have fun playing with 232Analyzer and Pelco-D cameras
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After reading this page and testing the camera with the 232Analyzer software
, you should be able to understand the ease of using the Pelco-D protocol, and
control any Pelco-D cameras in five minutes' time.
Notes:
1) Before you can control any Pelco-D cameras, you need to prepare the
following items:
- A PC running 232Analyzer program
- A RS-232 port (or USB/RS-232 converter)
- A
RS-232/RS-485 converter
2) Make sure your COM port settings in the 232Analyzer program matches with
camera's settings (Pelco-D cameras use No parity, 8 Data bits and 1 Stop
bit, baud rate depends on your camera setting)
(Click
here to download
the 232Analyzer FREE Version. Click here to download
Pelco-D/P device profiles)
1) The format of Pelco-D
Pelco-D consists of 7 hexadecimal bytes (all byte data used in this page
are in Hexadecimal format unless otherwise noted) |
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Byte 1 |
Byte 2 |
Byte 3 |
Byte 4 |
Byte 5 |
Byte 6 |
Byte 7 |
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Sync |
Camera Address |
Command 1 |
Command 2 |
Data 1 |
Data 2 |
Checksum |
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Byte 1 (Sync) - the synchronization byte, fixed to FF
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Byte 2 (Camera Address) - logical address of the camera being
controlled (Address 1 is 01)
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Byte 3 & 4 (Command 1 and 2) are shown below
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Byte 5 (Data 1) - pan speed, range from 00 (stop) to 3F (high speed) and
FF for "turbo" speed (the maximum pan speed that the device can go)
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Byte 6 (Data 2) - tilt speed, range from 00 (stop) to 3F (maximum speed)
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Byte 7 (Checksum) - sum of bytes (excluding the synchronization byte),
then modulo 100 (Decimal code: 256)
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Command 1 and 2 details |
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Bit 7 |
Bit 6 |
Bit 5 |
Bit 4 |
Bit 3 |
Bit 2 |
Bit 1 |
Bit 0 |
| Command 1 |
Sense |
Reserved |
Reserved |
Auto / Manual Scan |
Camera On/Off |
Iris Close |
Iris Open |
Focus Near |
| Command 2 |
Focus Far |
Zoom Wide |
Zoom Tele |
Tilt Down |
Tilt Up |
Pan Left |
Pan Right |
Fixed to 0 |
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Example (Command 2): |
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Pan Left - 0 0 0 0 0 1 0 0, which equals to 04 (both hexadecimal and
decimal) |
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Some other commands |
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Command |
Byte 3 |
Byte 4 |
Byte 5 |
Byte 6 |
| Go to Preset |
00 |
07 |
00 |
01 to FF |
| Set Zoom Speed |
00 |
25 |
00 |
00 to 33 |
| Set Focus Speed |
00 |
27 |
00 |
00 to 33 |
| Alarm Ack. |
00 |
19 |
00 |
Alarm no. |
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2) How to calculate
the checksum byte by using 232Analyzer
Suppose you are controlling camera 1 (address 1) to pan left at high
speed, the
command string of the first 6 bytes would be:
FF 01 00 04 3F 00
Step 1:
Go to "Checksum Calculator" pane, choose "Hex" as "Operands format"
and "+" as Operator. Then take out the first byte FF and key
in all other
bytes in the "Input operands" box. Remember to add "," after each byte
of data. You will then get the result of "44"
Step 2: Change Operator to "\,Mod", and key in the previous
result ("44") and modulo parameter "100" in the "Input operands" box, remember to add ","
after each byte of data. You will then get the result of "44" in
"Remainder (Mod)" box.
"44" would be the result of checksum, now the full string of
pan left at high speed command would be FF 01 00 04
3F 00 44
3) Pelco-D
command string examples
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Camera Address: 1 |
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Pan Left at high speed: FF 01 00 04 3F 00 44 |
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Pan Right at medium speed: FF 01 00 02 20 00 23 |
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Tilt Up at high speed: FF 01 00 08 3F 00 48 |
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Tilt Down at medium speed: FF 01 00 10 20 00 31 |
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Stop all actions (Pan/Tilt/Zoom/Iris etc.): FF 01 00
00 00 00 01 |
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Note: there will be no response from cameras in
Pelco-D protocol |
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4)
How to use 232Analyzer to control the Pelco-D cameras
Suppose you are controlling camera address no.
1 to pan left at medium speed (command string: FF 01 00 04
20 00 25)
Way 1: From the command pane - choose "Hex" as the TX
data format and key in the command string "FF,01,00,04,20,00,25," in the input
box as shown below. Then click on the "Send" button. The command will then
be sent out immediately and you will notice the camera panning left continuously.
Note:
If you are using the FREE Version, choose "Dec" as TX data format
and key in "255,1,0,4,32,0,37,"
Way 2: From Programmable buttons |
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Download and unzip the Pelco-DP.zip file, then
open "Pelco-D.232" file from 232Analyzer program. When you click on the
first button "Lef", the command will
be sent out after 500ms
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5) Have fun playing with 232Analyzer and Pelco-D cameras
The programmable buttons 1 to 8 will trigger the camera's action
continuously. To stop, you have to send out the "Stop" command
"FF 01 00 00 00 00 01" (or "255 01 00 00 00 00 01"
Decimal format) to the camera.
"Pelco-D.232" file allows you to send two (2) commands with the click of a
button, e.g. when you click on "Lef" button on the second row (button no.
9), the camera will pan left for 500ms and then stop. This is because
button no. 9 is linked to button 17, which stores the "Stop" command.
(Note: Programmable buttons 9 to 16 will trigger the
camera's action for 500ms and will stop automatically).
You may program it in such a way that the camera pans left for 500ms, stops, tilts up for 1000ms, stops, tilts down for 500ms, and then pans right
continuously. All sorts of actions can be done through "Programmable
Buttons" or "Macros" functions.
Have fun!
To learn about Pelco-P >>
Download Pelco-D/P examples and 232Analyzer >>
Questions about Pelco-D/P Protocols?
Use our online feedback form or contact Mr. Eric Hamilton from
Pelco Inc. (E-mail:
ehamilton@pelco.com)
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