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Stop speaking into the microphone. The main program audio should
4.
recover to the previous level after approximately two seconds. If not,
increase the threshold by turning the Talk Over Threshold Adjust pot
counterclockwise.
+24V Phantom Power switch
If a condenser microphone is used and power is required, set the +24V Phantom
Power switch on the back panel of the switcher to On.
Decoder Loop Function
For data projectors, plasma displays, and other displays on which the composite
video and S-video inputs do not work independently, the SWP123 is equipped
with a decoder loop function that converts all composite video signals to S-video.
This is accomplished by using an external Extron YCS Transcoder or a VYC
100N/P composite video to S-video decoder. Once the decoder loop is
configured and programmed, the following occurs when you select a composite
video input:
• The switcher automatically selects Input 4 in the S-video A/V group to enable
the loop.
• The Extron YCS Transcoder or VYC 100N/P composite video to S-video
decoder converts all composite video signals coming through the switcher
to S-video.
Wiring the decoder loop
1.
Connect the output of the Composite Video A/V group to the composite
input of the transcoder or decoder.
2.
Connect the S-video output of the transcoder or decoder to S-video input 4
of the SWP switcher.
3.
Connect the S-video output of the SWP switcher to the S-video input of the
display device.
Activate the decoder loop using the correct RS-232 serial command (see
4.
chapter 5) or the ICS100 Control Software (see chapter 4).
SWP123
MIC INPUT
INPUT 1
Figure 3-2 — Wiring the decoder loop
Projector
S W P 1 2 3 - 2
AUDIO [VGA]
L
L
L
L
OUTPUT
L
+24V
TALK OVER
+
PHANTOM
THRESHOLD
R
POWER
ADJUST
-
OFF
+
R
R
R
R
R
-
L
+
INPUT 1
INPUT 2
INPUT 3
INPUT 4
INPUT 1
ON
VGA
INPUT 2
INPUT 3
INPUT 4
OUTPUT
INPUT 1
Extron
YCS Transcoder
Composite Video/
S-Video Transcoder
SWP123 Presentation Switcher • Operation
AUD I O [ S - V I D E O ]
AUD I O [ C O M P O S I T E ]
L
L
L
OUTPUT
L
L
L
L
OUTPUT
+
R
-
R
R
R
R
R
R
R
-
L
+
INPUT 2
INPUT 3
INPUT 4
INPUT 1
INPUT 2
INPUT 3
INPUT 4
M A D E I N U. S. A .
S - V I D E O
C O M P O S I T E V I D E O
COMPOSITE VIDEO
INPUT 1
INPUT 3
INPUT 4
OUTPUT
INPUT 1
INPUT 2
INPUT 2
INPUT 3
INPUT 4
OUTPUT
INPUT 2
INPUT 3
INPUT 4
OUTPUT
COMPOSITE TO S-VIDEO
S-VIDEO TO COMPOSITE
INPUT
INPUT
9V
0.7A MAX.
PAL
NTSC
BUFFERED
OUTPUT
BUFFERED
OUTPUT
LOOP-OUT
LOOP-OUT
VCRs
100-240V
0.4A 50/60Hz
MASTER
AUDIO
OUTPUT
+
+
R
R
-
-
-
-
L
L
+
+
FUSE: 1.6A 250V
TIME DELAY
SERIAL
PORT
SERIAL
FORMAT
LISTED
C
1T23
RX+
SELECT
I.T.E.
RX-
TX+
TX-
MADE IN
GND
USA
R S 2 3 2
RS422/485
3-5
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