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Model DVS-2A
2-Port DVI Switch with Audio, Serial Control &
Long Cable Equalization
UMA1127
Rev B
© Copyright 2007. Hall Research Technologies, Inc. All rights
1163 Warner Ave Tustin, CA 92780, Ph: (714)641-6607, Fax -6698
2-Port DVI Switch with Audio & Serial Control
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. This equipment has been
tested and found to comply with the limits for a Class A computing
device, pursuant to Part 15 of the FCC rules. These limits are designed to
provide reasonable protection against 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 their 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.
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Table of Contents
2-Port DVI Switch with Audio & Serial Control
1.0 General ................................................................................................ 3
2.0 Features................................................................................................ 4
3.0 Installation ........................................................................................... 5
. Required Cables..................................................................................... 5
. Inputs & Outputs ................................................................................... 5
. Connecting the DVS-2A........................................................................ 5
. Connection Diagram.............................................................................. 6
4.0 Operation ............................................................................................. 7
. Switched Output .................................................................................... 7
. Modes of Operation ............................................................................... 7
. Priority Selection in Auto Mode............................................................ 8
. Long Cable Equalization ....................................................................... 8
. RS-232 Control Port Usage ................................................................... 8
. To configure HyperTerminal................................................................. 9
. Serial Port Control Codes .................................................................... 10
5.0 Troubleshooting................................................................................. 14
6.0 Specifications..................................................................................... 15
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2-Port DVI Switch with Audio & Serial Control
1.0 General
Thank you for purchasing Hall Research Technologies’ DVS-2A 2-Port
DVI Switch with Audio & Serial Control.
This unit provides both a video and audio output that can be switched
between two video and audio sources. This allows routing of multiple
DVI equipped devices (such as PC’s) to a single DVI display (such as a
plasma or LCD screen). The switcher supports single-link, DVI-D video
signals at resolutions up to 1920x1200 and HDTV up to 1080p.
The DVS-2A unit provides all the A/V and control connections on the
rear panel; the front panel has a push-button switch with corresponding
LED indicator for the selection of video source. The front panel also
features mode selection buttons to allow the unit to operate automatically
(based on video sync signal detection).
This unit can be controlled by either manually
switch, automatically
RS232 serial port.
The unit can be configured to operate in two different modes: Auto and
Manual.
There is a priority selection that can be set for the ‘Input 1’ DVI
connector. The switched output can be blanked and un-blanked either
from the front panel button or from a command sent from a PC to the
serial port.
The unit also has EEPROM (internal non-volatile flash memory) to store
the last operating mode when power is off.
based on video detection, or remotely through an
using the front panel
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2-Port DVI Switch with Audio & Serial Control
2.0 Features
9 Clear and sharp images at resolutions up to 1920x1200 including
HDTV up to 1080p
9 Hot pluggable
9 Supports the DDC2 standard for all input ports
9 HDCP & HDMI 1.3 Compatible
9 Allows one video with stereo audio to be switched between two
video and audio sources
9 Can be manually controlled by push-button switches, remotely by a
RS232 communication port
9 Provides an Auto mode to automatically select input source
9 Auto Mode priority can be set for input #1 or no-priority
9 Switched output can be blanked and un-blanked
9 Video Cable Equalization available for long cabling
9 Stores the last selection and mode in EEPROM
9 Compatible with the Universal Mounting Bracket
9 Ships with universal (100~240 VAC) power supply
9 Compact, Rugged, Reliable, and Economical
9 Made in USA
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2-Port DVI Switch with Audio & Serial Control
3.0 Installation
. Required Cables
The video input cables are generally DVI male to male (customer
furnished). The Audio inputs are 3.5 mm mini-stereo (customer
furnished). To connect to the unit to a Serial port (such as PC’s COM1)
you would need a Male/Female DB9 Serial Cable (customer furnished).
All of these items are available for purchase upon request.
. Inputs & Outputs
The DVS-2A has 2 video and audio inputs labeled ‘Input 1’ and ‘Input 2’.
The unit has 1 video and audio output labeled ‘Output’.
. Connecting the DVS-2A
Connect your video and audio sources such as computer or notebook PC
to ‘Input 1’ and ‘Input 2’.
Connect the display device such as a monitor (or a video projector) to the
switched video and audio outputs (SW Output).
Connect the included power supply to the DVS-2A.
Select the desired mode of operation including the priority 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
DVS-2A.
The device can be mounted via a Universal Mounting Bracket (sold
separately) if desired.
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2-Port DVI Switch with Audio & Serial Control
. Connection Diagram
MODEL DVS-2A REAR PANEL
Universal Mounting Bracket
6
2-Port DVI Switch with Audio & Serial Control
4.0 Operation
. Switched Output
The switched output SELECT button is used to select between video &
audio input sources of PC 1 and PC 2. A solid-on LED is used to indicate
which input is selected.
Holding down the switched output SELECT button for 3 seconds will
blank the current selected input source (and mute the audio output). The
LED for the current selected input will start blinking to indicate the
blanking mode. Pressing the switched output SELECT button again will
un-blank the output and un-mute the audio on the switched out rear
connector.
MODEL DVS-2A FRONT PANEL
. Modes of Operation
The unit can operate in either Auto or Manual mode by pressing the mode
button.
In Auto
video and audio. The presence of video is determined by examining the
V. Sync signal or optionally the +5 VDC signal from DVI input
connectors. The front panel switched output SELECT button cannot be
used to switch between ‘Input 1’ and ‘Input 2’ sources in this mode.
However, the switched output SELECT button can be used to blank the
output by holding it down for 3 seconds or to un-blank the output by
pressing it once.
In Manual mode, the output of the DVS-2A will depend on the selection
of the ‘Switched Output’ SELECT button.
mode, the DVS-2A will automatically select the input with active
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2-Port DVI Switch with Audio & Serial Control
. Priority Selection in Auto Mode
The priority button is used to select the priority as NONE or as INPUT 1.
This priority selection only applies to Auto
selected, the DVS-2A will automatically select ‘Input 1' whenever it
detects the presence of video at ‘Input 1’ connector, regardless of what is
happening at the ‘Input 2’ connector.
For example, if the ‘Output’ is playing the video & audio from ‘Input 2’
and video from ‘Input 1’ is detected, the output of the DVS-2A will
change to select ‘Input 1’ video immediately. With priority set to none,
the unit stays selected to the current input as long as it is detecting video
there.
mode. If INP 1 priority is
. Long Cable Equalization
The use of long DVI cables can cause the ‘Video’ image to degrade to
unacceptable levels.
By pressing and holding BOTH
SELECT’ buttons for 3 seconds, the video boost circuit will be enabled
and the LED’s will flash momentarily acknowledging the selection was
changed. Both of the GREEN LED’s flash when the BOOST is enabled
and the RED LED’s flash when the BOOST is disabled.
the ‘Mode SELECT’ and ‘Priority
. RS-232 Control Port Usage
The DVS-2A 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, and priority buttons.
Note on the 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. These are available from Hall
Research Technologies (Model USBRS232-1).
8
The DVS-2A will output a menu to the serial port on power-up. This
menu can also be displayed when the appropriate command is sent to the
DVS-2A via the serial port. To view the menu, an ASCII serial terminal
or terminal emulator software is needed. An example is Microsoft
Windows HyperTerminal (generally found in the Accessories ->
Communication folder)
2-Port DVI Switch with Audio & Serial Control
. To configure HyperTerminal
- Connect direct to any available COM port
- 4800 Baud, 8 bits, No Parity, 1 Stop bit, No flow control
- Settings per following figures:
After power-up the unit will output the following menu in ASCII through
its serial port:
MENU - Version 1.0
---------------------------------------- 1 = PC 1 Input | B = Blank
2 = PC 2 Input | U = Un-blank
A = Auto mode | E = Enable boost
M = Manual mode | D = Disable boost
P = PC 1 priority | R = Report
N = No priority | F = Factory Defaults
| C = Command menu
-----------------------------------------
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2-Port DVI Switch with Audio & Serial Control
. Serial Port Control Codes
Control codes are 1 byte commands from an external device to the Serial
Port on the DVS-2A.
ASCII ‘1’ (Hex 31 or Decimal 49)
Selects input #1 (immediately and unconditionally). The
device will respond with: PC 1 Input selected
If the device is in AUTO mode, the device will respond
with: Error: The unit is in auto mode
ASCII ‘2’ (Hex 32 or Decimal 50)
Selects input #2 (immediately and unconditionally). The
device will respond with: PC 2 Input selected
If the device is in AUTO mode, the device will respond
with: Error: The unit is in auto mode
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2-Port DVI Switch with Audio & Serial Control
ASCII ‘A’ or ‘a’ (Hex 41/61 or Decimal 65/97 )
Enters Auto mode. The user must select the desired
detection method by entering a number from 1 to 3 within
20 seconds. Values outside this range or delaying entry
longer than 20 seconds will result in an error message:
Invalid entry! Current detection stays the same.
The device will respond with:
Auto mode selected
Detection Method
---------------------------- 1 = Vertical sync
2 = 5V Power
3 = Vertical sync & 5V power
---------------------------- Current detection is [3](1-3)?
In Auto mode, the device automatically switches to the video
& audio input source that is active.
“Active” means that video signal has sync signal, it does not
mean there is a non-static screen!
ASCII ‘M’ or ‘m’ (Hex 4D/6D or Decimal 77/109)
Enters Manual mode.
The device will respond with: Manual mode
In Manual mode, the device stays on the currently selected
video & audio, regardless of the presence of video signal.
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2-Port DVI Switch with Audio & Serial Control
ASCII ‘P’ or ‘p’ (Hex 50/70 or Decimal 80/112)
Selects Input #1 priority.
The device will respond with: PC 1 priority selected
If ‘Input #1’ priority is selected, the unit will select input #1
automatically whenever the presence of the video at the
‘Input 1’ DVI connector is detected even if the output from
‘Input 2’ is currently playing.
ASCII ‘N’ or ‘n’ (Hex 4E/6E or Decimal 78/110)
Selects no priority for Input #1.
The device will respond with: No priority selected
ASCII ‘B’ or ‘b’ (Hex 42/62 or Decimal 66/98)
Blanks the output.
The device will respond with: Blank mode selected
When the output is blanked, only the color intensities of the
output are reduced to zero. The unit still operates in a normal
fashion and sync signals are still routed to the output. The
audio output is muted.
ASCII ‘U’ or ‘u’ (Hex 55/75 or Decimal 85/117)
Un-blanks the output.
The device will respond with: Unblank mode selected
ASCII ‘E’ or ‘e’ (Hex 45/65 or Decimal 69/101)
Causes the output signal equalization for long cabling to be
enabled.
The device will respond with: Boost enabled
ASCII ‘D’ or‘d’ (Hex 44/64 or Decimal 68/100)
Causes the output signal equalization for long cabling to be
disabled.
The device will respond with: Boost disabled
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2-Port DVI Switch with Audio & Serial Control
ASCII ‘R’ or ‘r’ (Hex 52/72 or Decimal 82/114)
Request the status report. The device will respond with a
display similar to below:
Report
-------------------- Input = 1
Mode = Auto
Priority = None
Blank = Off
Boost = Disabled
Detection method = Vertical sync
This report displays the current selection of the switched
output, mode, and priority buttons.
ASCII ‘C’ or ‘c’ (Hex 43/63 or Decimal 67/99)
Displays the menu. The device will respond with:
MENU - Version 1.0
---------------------------------------- 1 = PC 1 Input | B = Blank
2 = PC 2 Input | U = Un-blank
A = Auto mode | E = Enable boost
M = Manual mode | D = Disable boost
P = PC 1 priority | R = Report
N = No priority | F = Factory Defaults
| C = Command menu
-----------------------------------------
ASCII ‘F’ or ‘f’ (Hex 46/66 or Decimal 70/102)
Causes the system to be reset to its DEFAULT factory
settings.
The device will respond with: Factory default restored
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ASCII ‘v’ (Hex 76 or Decimal 118)
2-Port DVI Switch with Audio & Serial Control
Causes the system to display the firmware version number.
The device will respond with:
Firmware Version: X.Y where ‘X.Y’ is the numeric
version level of the firmware software.
5.0 Troubleshooting
Make sure that all your connections are solid, and check the state of the
LED’s on the front of the unit.
Do not open or try to repair the unit yourself. There is no customer
repairable item in the unit and you will void your warranty. Contact HRT
Support at 714-641-6607 or via email or web. If you need to ship your
switch for repair, make sure to get a Return Material Authorization
(RMA) number first.
Cable Length Limitations
The switcher cannot be used as an extender. Therefore it is best to plug
the output of the switch directly to the display device and use input cables
that are 5 meters (16 ft) maximum. In other words, try to keep the total
length of cables from the video source to the box and from the box to the
monitor should not exceed 16 feet. At longer distances you may
experience video degradation. If you cannot use shorter cables, try to set
the refresh rate and/or resolution of the video signal to a lower level.
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2-Port DVI Switch with Audio & Serial Control
6.0 Specifications
Video Inputs DVI-D Single Link, HDCP & HDMI 1.3 Compliant
Resolutions PC resolutions up to 1920x1200 @ 60 Hz and HDTV to
1080p
Audio Inputs PC audio outputs
Temperature Operating: 32 to 122°F (0 to 50°C);
Storage: –40 to +185°F (–40 to +85°C)
Enclosure Steel
MTBF 90,000 hours (calculated estimate)
Power 6V center positive via supplied Universal power supply
Size 1.3" High x 8.5" Wide x 2.6” Deep
Weight 1.1 pounds
DVI Connector pin out N/U = Not Used
Pin Signal name Pin Signal name
1 TMDS Data2– 13 TMDS Data3+ (N/U)
2 TMDS Data2+ 14 +5V Power
3 TMDS Data2/4 Shield 15 Ground for +5V Power
4 TMDS Data4– (N/U) 16 Hot Plug Detect
5 TMDS Data4+ (N/U) 17 TMDS Data0–
6 DDC Clock 18 TMDS Data0+
7 DDC Data 19 TMDS Data0/5 Shield
8 Analog vertical sync 20 TMDS Data5– (N/U)
9 TMDS Data1– 21 TMDS Data5+ (N/U)
10 TMDS Data1+ 22 TMDS Clock Shield
11 TMDS Data1/3 Shield 23 TMDS Clock+
12 TMDS Data3– (N/U) 24 TMDS Clock–
C1 Analog red C4 Analog horizontal sync
C2 Analog green C5 Analog ground
C3 Analog blue
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2-Port DVI Switch with Audio & Serial Control
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Product Designed and Made in the USA
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