IM0973120 A 01 7
7. Pelco-D commands
Pelco-D protocol as implemented in Orlaco Zoom camera or PTZ unit.
Commands detailed below are accepted, no responses are sent.
Bron:Pelco PTZ protocols, D Protocol, Version 5.0.1 1 april 2008 by Eric Hamilton (C) Pelco.
Command format:
All commands are seven (D Protocol)bytes long.
D Protocol Command Format/Names:
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6 Byte 7
Sync addr. cmnd1 cmnd2 data1 data2 chksm
0xff
Bytes D Protocol:
1 sync : Always 0xFF to indicate the start of a command.
2 addr : Camera address. Range is 1 ! 255 (0x01 ! 0xFF). 0x01 is for camera #1, etc.
3 cmnd1 : Extension of the basic command. The basic command is in the cmnd2 position.
4 cmnd2 : The basic command. For extended commands, all of these are odd numbers.
5 data1 : Usually is the Pan speed index.
6 data2 : Usually is the Tilt speed index.
7 cksm : This is the arithmetic sum of all bytes except for the sync byte and itself.
Command Sets
There are two sets/types of commands:
1 “Motion” commands, i.e. pan, tilt, iris, zoom and focus; are “bit encoded” commands that always have bit 0 in cmnd2 set to 0.
Any number of non-exclusive bits may be set in the cmnd1 and cmnd2 bytes for this format of command, data1 and data2 are pan and tilt speed index.
2 “Non-motion” commands, i.e. call preset, set pan angular position; are “numerically encoded”.
These commands always have bit 0 in cmnd2 set to a 1.
Implemented “Motion” commands:
cmnd1 and cmnd2 are represented as follows:
Byte 3, cmnd1
Bit 7 Bit 6 Bit 4 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 0 0 0 0 0 0 Focus
Near
Byte 4, cmnd2
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Focus Zoom Zoom Down Up Left Right 0
Far Wide Tele
Data1, Data2 (Pan/Tilt speed), Byte 5,6 contain the speed.
Speed is in the range of `0x00’ to `0x3F’ (high speed) and `0x40’ for “turbo” speed.
Turbo speed is the maximum speed the device can obtain.
A pan speed value of `0x00’ results in very slow motion, not cessation of motion.
To stop pan motion both the Left and Right direction bits must be turned off, set to `0’,
regardless of the value set in the pan speed byte.
Installation Manual
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