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Installation and Operation, cont'd
RS-232/RS-422 port — This connector provides for two-way
7
RS-232/RS-422 communication. See chapter three, "Serial
Communication", for information on how to install and use the
control software and SIS commands.
The default protocol is 9600 baud, 1 stop bit, no parity, and no
flow control.
The rear panel RS-232/RS-422, 9-pin
connector has the following pin assignments:
Pin RS-232 function
Description
1
–
No connection
2
Tx
Transmit data
3
Rx
Receive data
4
Tx 2
Transmit data
5
Gnd
Signal ground
6
–
No connection
7
–
No connection
8
Rx 2
Receive data
9
–
No connection
Genlock input and output connectors — Connect an external
8
blackburst signal to the input (In) female BNC connector for
genlocking the video signal in broadcast or other sync-critical
applications.
Connect any downstream equipment, which requires
genlocking, to the output (Out) female BNC connector to route
the blackburst signal throughout the system in broadcast or
other sync-critical applications.
See Genlock and Vertical Interval Switching in this chapter.
SDI (serial digital interface) connector — Connect an SDI
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signal to this female BNC connector.
Genlock and Vertical Interval Switching
For vertical interval switching (to allow clean switching between
signals from several devices during the vertical blanking period
of each signal), a composite sync signal can be applied at the
Genlock In connector, and it can also be passed to another
device via the Genlock Out connector.
If the genlock connectors are used only for vertical interval
switching, no horizontal or subcarrier phase adjustments are
required.
2-6
VSC 500/700/700D • Installation & Operation
5
1
9
6
DB9 Pin Locations
Female
Pin RS-422 function
Description
1
–
No connection
2
Tx-
Transmit ground
3
Rx-
Receive ground
4
–
No connection
5
Gnd
Signal ground
6
–
No connection
7
Rx+
Receive data
8
Tx+
Transmit data
9
–
No connection
Genlock setup
Genlock differs from simple vertical interval switching in that an
external device (a black burst generator) generates a reference
sync signal for the system, and every device that uses that signal
has its output signal's horizontal and subcarrier phases adjusted
to exactly match that of the generator to allow precise timing
and full synchronization. Genlocked systems produce cleaner
switches between inputs than do those without this type of
synchronization.
An oscilloscope is required for genlock setup, and a vectorscope
is recommended. Waveform monitors of types other than a
vectorscope may give the appearance that timing is adjusted
correctly when it is 180 degrees out of phase, which will result in
incorrect colors or picture artifacts.
To synchronize the VSC's video output with a genlock signal,
follow these steps:
All equipment in the system must be powered up and
turned on for at least 15 to 20 minutes before genlock
setup adjustments can be made and before the
equipment is used in a genlocked application.
Power up and turn on all the devices that will use the
1.
genlock signal. The devices must be on for at least 15
to 20 minutes before proceeding with any
adjustments.
Connect the active timing source signal to the
2.
Genlock In connector on the rear panel.
3.
Connect the video input signals to the VSC, as
described previously in this chapter.
4.
Connect the oscilloscope ("scope") probe A to the
Genlock Out connector. This will provide the scope's
reference signal. In order to avoid altering the
genlock signal, use the cabling configuration that will
be used in the installation. Either connect the genlock
signal cable from the scope to the next device in the
system to be timed, or provide 75 ohm termination
at the scope's genlock output.
R
G
B
H/HV
V
R/R-Y
100-240V
0.3A
R
G
B
H/HV
V
H/HV
INPUTS
50/60 Hz
To Scope Probe B
VSC 500/700/700D • Installation & Operation
Timing Source
OUT
G/Y
B/B-Y
SDI
IN
75 ohm Terminator
V
VID
S-VIDEO
OUT
RS-232
OUTPUTS
GENLOCK
/422
To Scope
Probe A
2-7
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