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4 x 1 S-Video Switch
with Audio and Serial Control
November 29, 2005
VS4-YCA User’s Manual
UMA1084 Rev. n/c
INFORMATION
Order toll-free in the U.S. 800-959-6439
FREE technical support, Call 714-641-6607 or fax 714-641-6698
Mail order: Hall Research Technologies 1163 Warner Ave., Tustin, CA 92780
Web site: www.hallresearch.com • E-mail: info@ hallresearch.com
VS4-YCA User's Manual
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Trademarks Used In this Manual
Hall Research, HRT, and (logo) are trademarks of Hall Research
Technologies, Inc. Any other trademarks mentioned in this manual are
acknowledged to be the property of the trademark owners.
Federal Communications Commission Statement
This equipment generates, uses and radiates radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful
interference to radio communications. It has been tested and found to comply
with the limits for a Class A computing device, pursuant to Part 15 of the FCC
rules. Harmful interference when operated in a commercial environment.
Operation of this equipment in a residential area may cause interference, in
which case the user, at his own expense, will be required to take whatever
measures are necessary to correct the interference.
European Union Declaration of Conformity
This product has been tested and shown to comply with the
requirements of the European EMC directive 89/336/EEC
Contents
1. Introduction .............................................................................. page 3
1.1 General ............................................................................... page 3
1.2 Features ............................................................................... page 3
2. Installation................................................................................. page 4
3. Operation................................................................................... page 4
3.1 Modes of Operation............................................................. page 4
3.2 Front-Panel Switches........................................................... page 4
3.3 RS-232 control via Hyper Terminal .................................... page 5
3.4 Non-Volatile Memory..........................................................page 6
4. Troubleshooting ........................................................................ page 6
4.1 Calling Hall Research and Shipping/Packaging................... page 6
5. Specifications............................................................................ page 6
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Video/Audio Switch
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1. Introduction
1.1 General
The Model VS4-YCA is a versatile S-Video (Y/C or S-VHS) Switch with 4
inputs and one output. It also switches stereo audio from each of the inputs. It is
compatible with all TV standards.
The selection of the channel to be displayed can be made from individual front
panel switches or via RS-232 control port. Four LED lights are used to show the
channel selection.
The unit features 250 MHz amplifiers for a clear and crisp image and also
buffers the audio signals with low noise amplifiers for a distortion-free sound.
The output can be placed in scan mode (either from the front panel by pressing
two buttons simultaneously, or via a serial command). In this mode the output
displays each input channel for a few seconds and cycles through all inputs. The
output can also be blanked (with audio muted) via a serial command.
1.2 Features
• Serial Port for Control via external device
• Buffered output; perfect for high quality video
• Scan mode to cycle through each input.
• LED Indicators
• Rugged Shielded Metal Enclosure
• Installs in minutes
• Universal Power Supply allows use world-wide
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2. Installation
1. Plug in the desired number of S-Video/Audio sources to the S-Video/Audio
inputs on the back of the VS4-YCA.
2. Connect an output device to the S-Video/Audio output on the back of the
VS4-YCA.
3. Connect the included RS-232 cable to a PC or other Serial control device if
so desired.
4. Connect the included power supply to the jack on the rear of the unit.
5. Apply AC to the power supply
6. Turn on your output video display and all audio/video sources
3. Operation
3.1 Modes of Operation
Scan Mode - Will cycle through and select each S-Video/Audio signal for a
programmed number of seconds (1 to 60), and then switch to the next SVideo/Audio input.
Normal Mode - S-VIDEO/AUDIO inputs are selected based on user input.
(default)
The VS4-YCA can only be in one of these modes at a time.
3.2 Front-Panel Switches
The first function of the front panel buttons is to switch from one S-Video/Audio
signal to another. Just press the button and the S-Video/Audio signal you
selected will be routed to the output. If there is no S-Video/Audio signal to be
displayed then you will see a black screen. The VS4-YCA will enter Normal
Mode any time a single front panel button is pressed.
The second use of the front panel buttons is to put the VS4-YCA into Scan
Mode. Press buttons 3 and 4 simultaneously and the VS4-YCA will enter Scan
Mode. The time interval between switching will be the time interval last
specified via Hyper Terminal. If no interval has been specified then the default is
5 seconds.
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The third use of the front panel buttons is to reset the VS4-YCA to the factory
default settings. Press button 1 and 4 simultaneously for 3 seconds. This will turn
off scan mode and set the scanning interval to the default time of 5 seconds. This
will also un-blank the outputs.
3.3 RS-232 control via Hyper Terminal
To use the RS-232 control interface, start HyperTerminal™ with the following
settings:
Baud rate: 4800
Data Bits: 8 Parity: None Stop Bits: 1 or 2
Flow Control: None
This is what the menu will look like in HyperTerminal™.
By pressing the number keys, "1", "2", "3", "4", the VS4-YCA will switch to
that S-Video/Audio input. This will also put the VS4-YCA into Normal Mode.
Pressing "s" will put the VS4-YCA into Scan Mode. Before the VS4-YCA enters
Scan Mode, you will be asked how many seconds between switching:
"Seconds between switching? (1-60)".
To this question, you must input a number between 1 and 60 then press enter.
Any other input will cause this question to be repeated.
Pressing "b" will blank the S-Video output and mute the line level Stereo Audio
output from the VS4-YCA until the un-blank command is received.
Pressing "u" will un-blank the S-Video output and un-mute the line level Stereo
Audio output from the VS4-YCA if it was previously blanked.
Pressing "f" will reset the VS4-YCA with the factory defaults. The factory
defaults are Normal Mode, and the time interval between scanning is 5 seconds.
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3.4 Non-Volatile Memory
The VS4-YCA saves the last channel selected and the Mode of operation (scan
vs. normal) after power off. Blanking mode is not remembered.
4. Troubleshooting
Contacting Hall Research and Shipping/Packaging
Contact HRT Support at 714-641-6607 or via email or web. Before you do,
make a record of the history of the problem. We will be able to provide more
efficient and accurate assistance if you have a complete description. If you need
to ship your unit for repair, make sure to get a RMA number first.
5. Specifications
Video Gain/Level Unity Gain. 1V p-p for Y, 0.3 V p-p for C
Audio Gain/Level Unity. Gain. 0 to +4dBu (0.78 to 1.23Vrms)
Video Bandwidth 250 MHz.(-3 dB)
Audio Bandwidth 10 Hz to 20 KHz
Input Impedance Video: 75 ? on Y and C, Audio: 5 K?
Serial Control 4800 Baud, 8-bit, 1 stop bit, no parity
Temperature Operating: 32 to 122°F (0 to 50°C)
Storage: –40 to +158°F (–40 to +70°C)
Enclosure Steel
MTBF 85,000 hours (calculated estimate)
Power From utility-power (mains) outlet, through included external
power supply. Output Voltage: 6v DC Center-Positive. Average
Power Consumption: 1 Watt
Size (hxwxd) 1.85”H X 10.88”W X 4.00”D
Weight 1.8 lbs (2.5 lbs shipping)
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Video/Audio Switch
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Products Designed and Made in the USA
© Copyright 2005. Hall Research Technologies, Inc.
All rights reserved.
1163 Warner Ave., Tustin, CA 92780
Ph: (714) 641-6607, Fax: (714) 641-6698
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