Specifications

SIGNAL DESCRIPTIONS
AC POWER CONNECTIONS
The AC Power connections should be connected to a low impedance source with a
nominal voltage of 24VAC, operating at a frequency of 47Hz to 63Hz. The camera will
operate within the range of 18VAC to 30VAC measured at the camera MS connector
with the camera operating. The camera draws 50 Watts maximum, which translates to
about 3.0 Amps at the worst case low line voltage of 18VAC. Careful attention should be
given to the power wiring to avoid excessive voltage drop, which will result in unreliable
operation of the camera.
The 24VAC power connections require the use of heavier gauge wiring and shorter cable
lengths than a similar 120VAC model, as the 24VAC camera model draws approximately
5 times as much current through the cable wiring, due to the reduced operating voltage.
Four power connection terminals are provided on the MS connector to allow paralleled
power wiring. Cable runs of up to 150 feet require paralleled #20 AWG wiring
(equivalent to #17 AWG) for reliable operation. Longer runs should use correspondingly
larger wire gauges to minimize voltage drop along the cables. Runs of 300 feet can use
#14 AWG wiring and runs of 500 feet can use #10 AWG or #12 AWG wiring.
ANALOG VIDEO CONNECTIONS
The Standard Definition camera model provides a 1Vpp NTSC compatible video output
with a 75 Ohm drive impedance on Pins L and A of the 18 pin MS connector (see wiring
chart).
The video outputs for the High Definition HD and HD30 720p/1080p camera model are
1Vpp with a 75 Ohm drive impedance in Y-Pb-Pr format.
PTZ SERIAL CONTROL PORT
An RS-485 port is provided on the SW720 camera for PTZ and other camera control
functions. There are internal 120 Ohm termination resistors for both the TX and RX
signal pairs. The factory shipped default state for the 120 Ohm terminations is for both
the TX and RX terminations to be enabled. Applications that involve multiple cameras on
the same RS-485 communications lines will require that the terminations on all cameras
but one be turned off.
SW720 Series 24VAC WTI ~ Page 17 of 23