Filter
Top Products
Pelco Manual C505M-B (4/97) 7
4.0 OPERATION
Upon applying power, the receiver will perform its self-test functions. These diag-
nostics determine the receiver, pan and tilt, lens and camera configuration by exer-
cising each. The results are reported by text superimposed on the video if the text
generator is preset (ZS versions). All versions are designed to allow the simulta-
neous operation of the PTZ commands. This feature is described in detail in the
firmware section (Section 6.0). Other features are automatic composite sync gen-
eration in the event of camera video failure.
CX9500 Receiver
The CX9500 Coaxitron receiver operation is similar to the Coaxitron System 2000.
Vertical Interval Signaling (VIS) is used to talk to and from the receiver. The actual
signal is a Pulse Width Modulated (PWM) 15 or 32 pulse train of 0.5 to 1.5 volts
amplitude, where a 2 µs pulse is considered a Coaxitron one (1), and a 1 µs pulse
is considered a Coaxitron zero (0). Line 10 is reserved for alarm reporting and
acknowledgment from the receiver by an 8-bit Coaxitron signal. Line 18 is reserved
for Coaxitron commands to the receiver in the form of 16-bit Coaxitron signals. Line
19 is reserved for Coaxitron data to the receiver in the form of 16-bit Coaxitron
commands. Compatibility with the older System 2000 controllers is maintained by
allowing a 15-bit Coaxitron signal in lines 15 through 19. Once a valid signal is
received, it is processed by the receiver as described in the firmware section (Sec-
tion 6.0) of this manual.
CX9504 Receiver
Four-wire RS-485 operation allows for applications that require the receiver to be
interfaced to single control and response channels in a daisy-chained fashion. The
protocol is given in the firmware section (Section 6.0) of this manual. The drivers
follow the RS-485 specification and are tri-stated to “high Z” when not transmitting.
This allows several receivers to be wired together in a daisy-chained fashion on a
single control channel. There is no channel contention avoidance built into the re-
ceiver. When it hears a valid command for its address, it immediately responds.
Contention avoidance must be accounted for at the controller.
“PP” Option
This option allows 32 complete preset senses to be programmed and recalled as
described in the firmware section. It should be noted that the protocol for this op-
eration is not compatible with the older (Coaxitron Matrix) 7500 style preset proto-
col.
“VS” Option
This option provides the control for 12 VDC brushed motors to be driven in a vari-
able speed fashion.