Hall Research VS-4A User Manual
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Model VS-4A
4 Channel VGA Switch with Audio & Serial
Control
• Switches Between 4 PC Video and Audio Signals
• Manual or Auto Switching Based on Active Video
• RS-232 Serial Control
UMA1120
Rev 1.1
© Co
1163 Warner Ave Tustin, CA 92780, Ph: (714)641-6607 , Fax -6698
ht 2007. Hall Research Technologies, Inc.. All rights reserved.
4 Channel VGA Switch w/Audio & Serial Control
Contents
1. INTRODUCTION.............................................................................. 2
1.1 GENERAL ........................................................................................ 2
1.2 FEATURES ....................................................................................... 2
2. INSTALLATION ............................................................................... 3
2.1 REQUIRED CABLES.......................................................................... 3
2.2 INPUTS & OUTPUTS ......................................................................... 3
2.3 CONNECTING THE VS-4A................................................................ 3
2.4 CONNECTION DIAGRAM .................................................................. 4
3. CONFIGURATION & OPERATION ............................................. 5
3.1 MODES OF OPERATION.................................................................... 5
3.2 FRONT-PANEL SWITCHES ................................................................ 6
3.3 RS-232 CONTROL ........................................................................... 7
3.4 SERIAL PORT CONTROL CODES ....................................................... 8
4. TROUBLESHOOTING .................................................................. 11
4.1 IN CASE OF TROUBLE .................................................................... 11
4.2 CALLING HALL RESEARCH TECHNOLOGIES .................................. 11
4.3 SHIPPING AND PACKAGING............................................................ 11
5. SPECIFICATIONS.......................................................................... 12
1
4 Channel VGA Switch w/Audio & Serial Control
1. Introduction
1.1 General
Thank you for purchasing Hall Research Technologies VS-4A 4x1
VGA Switch with Audio & Serial Control.
This unit provides a video along with audio output that can be
switched between four video and audio sources. The unit is
housed in a small RFI shielded enclosure and is supplied with a
universal AC power adapter.
The VS-4A unit provides all the A/V and control connections on
the rear panel; the front panel has push-button switches with
corresponding LED indicators for the selection of the video
source. This unit can be controlled either manually using the front
panel switches, automatically based on video detection, or
remotely through an RS232 serial port.
The unit can be configured to operate in three different modes,
which are: Auto, Scan and Normal. There is a priority selection
that can be used to set for the video inputs. The switched output
can be blanked and un-blanked from the PC command sent
through the serial port. The front-panel buttons can be ‘locked’ to
prevent accidental changes to the settings from a PC command
sent through the serial port.
The unit also has EEPROM (internal non-volatile flash memory) to
restore the last operating mode from when the unit is powered off.
1.2 Features
9 Allows four video & stereo audio input sources to be
switched to one output
9 Can be manually controlled by push-button, via RS232
communication port or by detecting active video input
9 Auto mode automatically scans and selects the input with
active video with selectable input priorities
9 Front panel buttons can be ‘Locked’ out
9 Switched output can be blanked and un-blanked
9 Stores the last selection and mode in EEPROM
9 In scanning mode inputs are shown for pre-determined
periods
9 Ships with power supply
9 Compact, Rugged, Reliable, and Economical and Made in
USA
2
4 Channel VGA Switch w/Audio & Serial Control
2. Installation
2.1 Required Cables
The video input cables are generally HD15 (VGA) male to male
(customer furnished). The Audio inputs are 3.5 mm mini-stereo
plugs (customer furnished). If you are going to connect the unit to
a Serial port (such as PC’s COM) you would need a straightthrough Male/Female DB9 Serial Cable (customer furnished).
2.2 Inputs & Outputs
The VS-4A has 4 video and audio inputs marked Video 1 through
4 and Audio 1 through 4. The unit has 1 video and audio output
marked Video and Audio Output. The unit has 1 serial port
connector labeled RS232.
2.3 Connecting the VS-4A
Connect your video and audio sources such as computer or
notebook PC to any of the Video and Audio Inputs 1 through 4.
Connect the display device such as a monitor (or a video
projector) to the switched video and audio outputs (Video and
Audio Output).
Connect the included power supply to the VS-4A.
Select the desired video source or mode of operation for your
video and audio output using the front panel switched buttons. If
preferred, the selection can also be done through RS-232 serial
commands by connecting a DB9 RS-232 Serial cable to your PC
and the VS-4A.
3
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