QSP-421SS: Instructions for basic operation and installation
Page
6
I
NPUT
T
ERMINATION
The “C” jumpers affect the camera input termination resistor. When
the jumper is installed a 75 Ohm termination is connected to the
respective cameras. Additionally the “V” jumper serves the same
purpose on the VCR input. For proper operation a termination resistor
of 75 ohms should be on the last piece of video equipment which is
connected to a given camera. For a simple system where cameras
are brought directly into the QSP-421SS, the termination resistors are
always enabled (factory default). When connecting a camera to more
than one piece of equipment, or if “loop through” is used, individual
terminating resistor jumpers should be removed and the termination
should be made at the monitor(s).
A
LARM
C
ONTACTS
The “A” jumper affects whether the alarm inputs are active when the
contacts are closed (jumper installed - factory default) or open (jumper not installed). In either case the
assumption is that the alarm contacts connect together the ground pin and the alarm input pin associated
with a particular camera. For “normally open” type contacts, the “A” jumper should be installed. For
“normally closed” type contacts, the “A” jumper should not be installed. The QSP-421SS assumes that all
the alarm inputs are of the same type. Selecting an incompatible combination of contact type and option
setting will result in the QSP-421SS being in a continuous “alarm” condition which is indicated by the unit
to seemingly be stuck in full frame sequencing mode, and generating a continuous alarm output state.
Please note that if less than four alarm inputs are used and “A” jumper is not installed, the remaining
alarm inputs must be grounded (Tied to pin 10).
D
WELL
O
PTIONS
The QSP-421SS dwell time is set by SW9 and affects the
amount of time between camera changes. The dwell
setting is set to a factory default of 4 seconds but is
adjustable in 4 sec steps from 4 to 16 seconds.
The dwell time affects:
1. Full frame sequencing dwell time.
2. PIP background sequencing dwell time.
3. PIP insert sequencing dwell time.
4. Alarm full frame sequencing dwell time
(when more than one simultaneous alarm input).
F
IELD
/F
RAME
M
ODE
S
ELECTION
Switch positions #1 and #2 on SW9 control how video field information is handled. We have preset them to
defaults that should work with most systems, but there is a very large variation in the behavior of VCRs and you
may have to experiment with the settings that work best for your installation.
Camera
Camera
Camera
Camera
75ohm
75ohm
75ohm
75ohm
Other Video
Equipment
Without 75ohm
QSP421SS
Tee
Tee
Loop
Through
Other
Equipment
1
2
3
4
SW9: Dwell Time Setting
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
Seconds
8
12
16
4
Field/Frame
Field/Frame Mode Selection
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
----
(Factory Default Shown)
Dwell Time
Seconds
Seconds
Seconds
Field Mode Toggle
Field Mode Single
Frame Mode Force Odd
Frame Mode Force Even
