HRT VS-4A Manual de usuario
© Co
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1163 Warner Ave Tustin, CA 92780, Ph: (714)641-6607 , Fax -6698
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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
4 Channel VGA Switch w/Audio & Serial Control
1
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
4 Channel VGA Switch w/Audio & Serial Control
2
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
9Allows four video & stereo audio input sources to be
switched to one output
9Can be manually controlled by push-button, via RS232
communication port or by detecting active video input
9Auto mode automatically scans and selects the input with
active video with selectable input priorities
9Front panel buttons can be ‘Locked’ out
9Switched output can be blanked and un-blanked
9Stores the last selection and mode in EEPROM
9In scanning mode inputs are shown for pre-determined
periods
9Ships with power supply
9Compact, Rugged, Reliable, and Economical and Made in
USA
4 Channel VGA Switch w/Audio & Serial Control
3
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 straight-
through 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.
4 Channel VGA Switch w/Audio & Serial Control
4
2.4 Connection Diagram
4 Channel VGA Switch w/Audio & Serial Control
5
3. Configuration & Operation
3.1 Modes of Operation
Auto Mode - This will select the VGA and Audio input with
the highest priority that has an active VGA signal.
Scan Mode - Will select each active VGA and Audio input
signal for a specified number of seconds, 1-60, and then
switch to the next active VGA input. The VS-4A can also be
configured to scan the non-active VGA inputs as well as the
active VGA inputs.
Normal Mode - VGA inputs are selected based on front
panel push-button selections.
The VS-4A can only be in one of these modes at a time. You can
specify mode of operation either from the Serial port or from the
front panel (by pressing switch combinations simultaneously).
Pressing SEL 1 & SEL 2 simultaneously selects “AUTO”
mode.
Pressing SEL 3 & SEL 4 simultaneously selects “SCAN”
mode.
The VS-4A retains the last mode that it was in after power off and
upon power up, will enter the last mode that it was in.
4 Channel VGA Switch w/Audio & Serial Control
6
3.2 Front-Panel Switches
The front panel switches may be locked out so pressing them has
no effect. Locking and unlocking the front panel switches can only
be accomplished via the serial RS-232 commands.
The first function of the front panel buttons is to switch from one
VGA & Audio signal to another. Just press the button and the VGA
signal you selected will be displayed when the front panel is not
locked. If there is no VGA signal to be displayed then you will see
a black screen. The VS-4A will enter the Normal Mode any time a
single front panel button is pressed and the front panel is not
locked.
The second use of the front panel buttons is to put the VS-4A into
Auto Mode. Press buttons 1 and 2 simultaneously and the VS-4A
will enter the Auto Mode when the front panel is not locked.
The third use of the front panel buttons is to put the VS-4A into
Scan Mode. Press buttons 3 and 4 simultaneously and the VS-4A
will enter the Scan Mode when the front panel is not locked.
The time interval between switching will be the time interval last
specified via the serial port. If no interval has been specified via
the RS232 port then the default is 5 seconds.
Whether or not to scan non-active VGA inputs along with active
VGA inputs will be determined from the last user input via serial
port. If there has been no user input, the default is to not scan the
non-active VGA inputs.
4 Channel VGA Switch w/Audio & Serial Control
7
3.3 RS-232 Control
The VS-4A can also be controlled via a serial device. The unit
operates at a baud rate of 4800 bps. From the serial port, you
have full control over the operation of the switched output; mode,
priorities, scan time and front-panel lock status.
Note on RS-232 port availability on your PC
Most PCs and notebooks do not have a serial port. So to program
the Switch you may need a USB to RS-232 Serial converter. Please
contact your Hall Research Technologies sales representative if
you need to buy one.
The VS-4A will output a menu to a serial port on power-up. This
menu will also be displayed when a “List” command is sent to it via
a serial port. To view the menu, An ASCII serial terminal or
terminal emulator software is needed. An example is Microsoft
WindowsHyperTerminal (generally found in
Accessories\Communication folder)
. To configure HyperTerminal
-Connect direct to any available COM port
-4800 Baud, 8 bits, No Parity, 1 Stop bit, No flow
control
4 Channel VGA Switch w/Audio & Serial Control
8
After power-up the unit will output the following menu in ASCII
through its serial port:
3.4 Serial Port Control Codes
(1 byte commands from external control device)
ASCII 1 (or Hex 31)
Selects Video input #1
ASCII 2 (or Hex 32)
Selects Video input #2
ASCII 3 (or Hex 33)
Selects Video input #3
ASCII 4 (or Hex 34)
Selects Video input #4
Ver1.0
------
1 = #1 In
2 = #2 In
3 = #3 In
4 = #4 In
a = Auto mode
s = Scan
b = Blank
u = Un-Blank
p = Priorities
r = Reset
l = Lock/Unlock
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