Pelco P message structure

Pelco P message structure

Byte 0	Byte 1	Byte 2	Byte 3	Byte 4	Byte 5	Byte 6	Byte 7
STX	Address	Data 1	Data 2	Data 3	Data 4	ETX	Check Sum

Byte 0 is always $A0

Byte 6 is always $AF

	Bit 7	Bit 6	Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
Data 1	0	Camera On	Autoscan On	Camera on / off	Iris Close	Iris Open	Focus Near		Focus Far
Data 2	0	Zoom Wide	Zoom Tele	Tilt Down	Tilt Up	Pan Left	Pan Right		0 (for pan / tilt)
Data 3	Pan Speed $00 to $3F and $40 for Turbo
Data 4	Tilt Speed $00 to $3F

Byte 8: checksum. XOR sum of Bytes 1-7

EXTENDED COMMANDS

Command	Data byte 1	Data byte 2	Data byte 3	Data byte 4
Set Preset XX	00	03	00	01 to FF
Clear Preset XX	00	05	00	01 to FF
Go To Preset XX	00	07	00	01 to FF
Flip (rotate 180º)	00	07	00	21
Zero Pan Position	00	07	00	22
Auto scan	00	09	00	00
Stop auto scan	00	0B	00	00
Remote Reset	00	0F	00	00
Zone Start	00	11	00	01 to 08
Zone End	00	13	00	01 to 08
Write char to screen	00	15	0 to 28	0 to 7F
Clear Screen	00	17	00	00
Alarm Ack	00	19	00	01 to 08
Zone Scan On	00	1B	00	00
Zone Scan Off	00	1D	00	00
Pattern Start	00	1F	00	00
Pattern Stop	00	21	00	00
Run Pattern	00	23	00	00
Zoom Lens Speed	00	25	00	00 to 03
Focus Lens Speed	00	27	00	00 to 03