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Pelco Manual C466M-E (6/99) 19
5.0 FIRMWARE
5.1 COAXITRON CONTROL COMMAND
This section describes the protocol used to send commands to the receivers via
Coaxitron.
The hardware interface is a 32-bit PWM (pulse width modulated) signal, wherein a
one microsecond pulse is considered a zero and a two microsecond pulse is con-
sidered a one. There will be a minimum one (1) microsecond off space between
pulses. Line 18 will contain Bytes 1 and 2, line 19 will contain Bytes 3 and 4.
Commands are divided into two (2) categories. The first is referred to as PTZ (pan
and tilt and lens) commands; the second category is Extended commands.
5.1.1 PTZ (Pan/Tilt and Lens) Commands
All PTZ (pan/tilt and lens) commands will always have B0 of Byte 2 set to zero. The
remainder of the format is as follows:
Byte 1: B7 — Camera on, auto scan
B6 — Coaxitron usage only
B5 — Coaxitron usage only
B4 — Auto scan, manual scan
B3 — Camera on, camera off
B2 — Iris close
B1 — Iris open
B0 — Focus near
Byte 2: B7 — Focus far
B6 — Zoom wide
B5 — Zoom tele
B4 — Down
B3 — Up
B2 — Left
B1 — Right
B0 — always zero for a PTZ command
Byte 3: Pan speed with values 0 to 0x3F and 0xFF (pan turbo)
Byte 4: Tilt speed with values 0 to 0x3F
Examples: Left, half Speed 00 04 1F 00
Left, Turbo Speed 00 04 FF 00
Stop 00 00 00 00