Sierra Video Manzanita 321V - Manual (Page 5)

Sierra Video Systems • P.O. Box 2462 • Grass Valley, CA 95945 • (530) 478-1000 • Fax (530) 478-1105
INSTRUCTION MANUAL
5
If the audio source is unbalanced (one wire with a
shield), connect the single wire to the “+” pin and
the shield to the “G” pin. Leave the “-” pin open.
If the audio source is balanced with no shield,
connect the two wires to the “+” and “-” pins and
leave the “G” pin open.
Control panels
If the local control panel for the Model 321V is
ordered at the same time as the router, the panel is
installed at the factory in place of the front cover.
If the local control panel is added later, begin its
installation by first removing the front cover,
which is held at each end by magnets attached to
the rack frame mounting angles at each end of the
frame. The optional local control panel includes
two ribbon cables which mate with two headers
on the front edge of the Model 32V electronics.
The ends of the cables are labeled “LAMPS” and
“SWITCHES”. The LAMP cable mates with the
header on the left.
The optional remote control panel, if ordered, is a
separate 1 3/4" high rack mount unit plus separate
interconnect cable. After mounting the remote
panel at the desired location, connect one end of
the cable to the connector labeled “CONTROL
PANEL” at the rear of the Model 321V, 321S or
324V frame. The Model 321S has two connectors
labeled “CONTROL PANEL OR AFV”. Either
connector can be used. Connect the other end of
the cable to the connector on the rear of the
remote panel.
If a Model 321S is ordered with a Model 321V or
Model 324V, SVS provides a short cable to tie
one of the connectors behind the Model 321S to
the video router.
Serial control
The Model 321V has built-in RS232 serial
control. Connection is made to a male 3 pin mini-
“XLR” connector on the rear of the Model 321V
(a mating connector is supplied with the unit). The
pinout of this connector is as follows:
Pin Function
1 Transmit output of 32V to your SIA input
2 Ground
3 Receive input of 32V to your SIA output
The Model 324V has optional built-in RS232
serial control. Connection is made to a female 9
pin D miniature connector on the rear of the
Model 324V. The pinout of this connector is as
follows:
Pin Function
2 Receive input of 32V to your SIA output
1 Ground
8 Transmit output of 32V to your SIA input
Model 321V Circuit Description
The electronics for the Model 321V are all on a
single plug-in module, the 503101. Refer to the
schematic diagram while reading the following
circuit description. The drawing is divided into 2
pages by circuit function. The following text is
organized the same way.
Video circuits (sheet 1 of 2 of the schematic
diagram). The 503101 video bus is made of 32
discrete video crosspoint circuits. The same
component designators and values are used for all
32 crosspoints. Only one crosspoint is described
here. Video input 1 enters the 503101 on edge
connector J1 pin 4. From there it is AC coupled
through C1. C1 protects the circuitry of the
503135 from possible damage if the incoming
video signal were to have an excessive DC
component on it. R1, after C1, provides a +0.7V
reference to the AC coupled signal. The video
crosspoint which follows is a “T” circuit configu-
ration. When a crosspoint is off, the two transistors
in the signal path are both off and the diode
between them is on. This provides very high