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Appendix C: Protocol-Pelco
The speed dome can be controlled through a keyboard which built in D protocol and P protocol.
Please follow the instruction to manipulate our Speeddome with a keyboard which built in D protocol
and P protocol.
Symbol Definition
<Preset Go>
A single button which can command a dome to go to specific
preset position.
<Preset Set>
(1) A single button which can set preset parameter ( D Protocol).
(2) A virtual button which is pressing <Preset Go> for 3 seconds
to set preset parameter ( P Protocol ).
Special Function
7 7 <Preset Go>
(1) It can set display or close an OSD menu.
(2) It is a virtual key to emulate “ENTER” button.
7 8 <Preset Go> Reset Dome Camera
Control Dome Camera Using Pelco Keyboard
• Some differences between different keyboards when OSD is open.
1) P protocol keyboard can move cursor up/ down/ right/ left with pushing joystick up/
down/ right/ left.
2) D protocol keyboard can move cursor up/down with pushing joystick up/down. But D
protocol keyboard can move cursor right/ left with pushing joystick right/ left plus press
button on joystick.
• Some differences for ‘ENTER’ command.
1) P/D protocol keyboard couldn’t issue ‘ENTER’ command directly. You can send a
‘ENTER’ command through “ 7 7 <Preset Go> “.
Cable Length
The communication interface between Speed Dome and Keyboard is RS-485. Maximum cable
length for RS-485 communication over 24-gauge wire is 4000 feet (1219 meters). CAT 5 cables are
recommended.