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22 Pelco Manual C466M-E (6/99)
5.2.4 Extended Commands
Extended commands will always have B0 of Word 4 set to one. The following num-
bers are in hexadecimal format:
Command Word 3 Word 4 Word 5 Word 6
Set preset XX 00 03 00 01 to 20
Clear preset XX 00 05 00 01 to 20
Go to preset XX 00 07 00 01 to 20
180 FLIP preset 00 07 00 21
Zero pan position 00 07 00 22
Set aux XX 00 09 00 01 to 08
Clear aux XX 00 0B 00 01 to 08
Remote Reset 00 0F 00 00
Clear screen 00 17 00 00
Pattern Start Point 00 1F 00 00
Pattern Stop Point 00 21 00 00
Run Pattern 00 23 00 00
Lens Speed 00 25 00 00 to 03
The four word response format is: word one is the sync 0xFF, word 2 is the receiver
address, word 3 is the alarm information, and word 4 is a return check sum (which
is the transmitted check sum added to the alarm information).
5.3 PELCO “P” TYPE RS-422 CONTROL
5.3.1 Protocol
This section describes the protocol used to send commands to the receivers via
RS-422. The hardware interface is four-wire RS-422, where one pair is used to
issue commands to the receiver. The protocol is one start bit, eight bits data, and
one stop bit at 9600, 4800 or 2400 baud. The message format is 8 of these 10-bit
words with the following format:
WORD 1 — STX (0XA0)
WORD 2 — ADD (0 to 0X1F)
WORD 3 — Data as described below
WORD 4 — Data as described below
WORD 5 — Data as described below
WORD 6 — Data as described below
WORD 7 — ETX (0XAF)
WORD 8 — CRC