TV to VGA Converter/Line Doubler
With Audio and Output VGA Switch
January 2002
AC135A
Order toll-free in the U.S. 24 hours, 7 A.M. Monday to midnight Friday: 877-877-BBOX
FREE technical support, 24 hours a day, 7 days a week: Call 724-746-5500 or fax 724-746-0746
Mail order: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: info@blackbox.com
CUSTOMER
SUPPORT
INFORMATION
TV to VGA Converter/Line Doubler
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TRADEMARKS USED IN THIS MANUAL
BLACK BOX and its logo are registered trademarks of Black Box
Corporation.
Apple and Macintosh are registered trademarks of Apple Computer, Inc.
IBM is a registered trademark of International Business Machines
Corporation.
SGI is a registered trademark of Silicon Graphics, Inc.
Sun and Sun Microsystems are registered trademarks of Sun Microsystems,
Inc. in the United States and other countries.
Any other trademarks mentioned in this manual are acknowledged to be
the property of the trademark owners.
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FEDERAL COMMUNICATIONS COMMISSION
AND CANADIAN DEPARTMENT OF COMMUNICATIONS
RADIO FREQUENCY INTERFERENCE STATEMENTS
This equipment generates, uses, and can radiate radio frequency energy
and if not installed and used properly, that is, in strict accordance with
the manufacturer’s instructions, may cause interference to radio
communication. It has been tested and found to comply with the limits
for a Class A computing device in accordance with the specifications in
Subpart B of Part 15 of FCC rules, which are designed to provide
reasonable protection against such interference when the equipment is
operated in a commercial environment. Operation of this equipment in
a residential area is likely to cause interference, in which case the user
at his own expense will be required to take whatever measures may be
necessary to correct the interference.
Changes or modifications not expressly approved by the party
responsible for compliance could void the user’s authority to operate
the equipment.
This digital apparatus does not exceed the Class A limits for radio
noise emission from digital apparatus set out in the Radio Interference
Regulation of the Canadian Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques
dépassant les limites applicables aux appareils numériques de la classe
A prescrites dans le Règlement sur le brouillage radioélectrique publié
par le ministère des Communications du Canada.
EUROPEAN UNION DECLARATION OF CONFORMITY
This product complies with the requirements of the European EMC
directive 89/336/EEC
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Normas Oficiales Mexicanas (NOM)
Electrical Safety Statement
INSTRUCCIONES DE SEGURIDAD
1. Todas las instrucciones de seguridad y operación deberán ser leídas
antes de que el aparato eléctrico sea operado.
2. Las instrucciones de seguridad y operación deberán ser guardadas para
referencia futura.
3. Todas las advertencias en el aparato eléctrico y en sus instrucciones de
operación deben ser respetadas.
4. Todas las instrucciones de operación y uso deben ser seguidas.
5. El aparato eléctrico no deberá ser usado cerca del agua—por ejemplo,
cerca de la tina de baño, lavabo, sótano mojado o cerca de una alberca,
etc.
6. El aparato eléctrico debe ser usado únicamente con carritos o pedestales
que sean recomendados por el fabricante.
7. El aparato eléctrico debe ser montado a la pared o al techo sólo como
sea recomendado por el fabricante.
8. Servicio—El usuario no debe intentar dar servicio al equipo eléctrico
más allá a lo descrito en las instrucciones de operación. Todo otro
servicio deberá ser referido a personal de servicio calificado.
9. El aparato eléctrico debe ser situado de tal manera que su posición no
interfiera su uso. La colocación del aparato eléctrico sobre una cama,
sofá, alfombra o superficie similar puede bloquea la ventilación, no se
debe colocar en libreros o gabinetes que impidan el flujo de aire por los
orificios de ventilación.
10. El equipo eléctrico deber ser situado fuera del alcance de fuentes de
calor como radiadores, registros de calor, estufas u otros aparatos
(incluyendo amplificadores) que producen calor.
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11. El aparato eléctrico deberá ser connectado a una fuente de poder sólo
del tipo descrito en el instructivo de operación, o como se indique en el
aparato.
12. Precaución debe ser tomada de tal manera que la tierra fisica y la
polarización del equipo no sea eliminada.
13. Los cables de la fuente de poder deben ser guiados de tal manera que no
sean pisados ni pellizcados por objetos colocados sobre o contra ellos,
poniendo particular atención a los contactos y receptáculos donde salen
del aparato.
14. El equipo eléctrico debe ser limpiado únicamente de acuerdo a las
recomendaciones del fabricante.
15. En caso de existir, una antena externa deberá ser localizada lejos de las
lineas de energia.
16. El cable de corriente deberá ser desconectado del cuando el equipo no
sea usado por un largo periodo de tiempo.
17. Cuidado debe ser tomado de tal manera que objectos liquidos no sean
derramados sobre la cubierta u orificios de ventilación.
18. Servicio por personal calificado deberá ser provisto cuando:
A: El cable de poder o el contacto ha sido dañado; u
B: Objectos han caído o líquido ha sido derramado dentro del aparato;
o
C: El aparato ha sido expuesto a la lluvia; o
D: El aparato parece no operar normalmente o muestra un cambio en su
desempeño; o
E: El aparato ha sido tirado o su cubierta ha sido dañada.
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Contents
1. Introduction ...............................................................................page 6
1.1 General ................................................................................page 6
1.2 Features ...............................................................................page 7
2. Installation .................................................................................page 8
3. Operation .................................................................................page 11
4. Configuration...........................................................................page 13
4.1 RS-232 Control and Configuration.....................................page 13
4.2 Control Panel Software for Windows.................................page 14
5. Troubleshooting.......................................................................page 15
6. Specifications...........................................................................page 16
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1. Introduction
1.1 General
The Model AC135A converts an NTSC or PAL video signal to VGA
for display on PC monitors, projectors, or HDTV (in 480p or 600p
modes). The converter doubles the frame rate by turning the interlaced
TV signal into a "progressive scan" (non-interlaced) signal suitable for
high resolution display devices.
The AC135A provides multiple TV video inputs: two (2 ea.) RCA
composite video and one (1 ea.) S-Video - all with their own
corresponding stereo audio inputs.
Additionally, the AC135A provides a separate VGA and audio input
from a PC that can be switched to the output. This makes the AC135A a
4 multi-standard input to 1 VGA output device.
The user can select any of the inputs using a single push-button switch
on the front panel. An RS232 serial port is available for external control
and/or changing the internal configuration of the unit.
Selection of the input channel for display is made by a simple onebutton operation. The audio selection follows the selected input channel
(switched on or off), or can be mixed continuously to the output.
The unit features non-volatile memory to store the selected channel and
performance characteristics.
The AC135A's VGA output can drive VGA extension cables to 200
feet. It is recommended that when video extension cables are used, only
high quality multi-coaxial VGA or RGBHV (such as Black Box
EVNPS05-0050-MF) be used.
The Model AC135A is housed in a compact shielded enclosure and
includes a small power adapter and 6 ft video and audio cables for
connection to the PC’s VGA and sound outputs.
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1.2 Features
• 3 NTSC/PAL and 1 PC input to one VGA output
• Full screen 24-bit true color broadcast-quality video
• Eliminates interlace flicker from video presentations
• Significantly improves appearance of projected video images
• Reduces visible line structure on large video images
• VGA input for full screen TV or PC Video display
• RS-232 control input port
• No software required
• 4 Stereo audio inputs
• User programmable brightness and contrast for TV input
• Low cost, high reliability
• Packaged in portable EMI shielded enclosure
• VGA input resolutions to 1600 x 1200
Figure 1.1
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2. Installation
1. Connect one or more of the video and audio input signals to the
input connectors on the AC135A. Figure 2.1 shows a typical setup.
Figure 2.1
Video Conferencing
Document Camera
Notebook PC
VCR or DVD
VGA Projector
VGA
LCD / Monitor
- or -
AC135A
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Figure 2.2
2. The following table summarizes the available inputs:
Connector
Name
Connector
Type
Signal Type Comments
VGA IN HD15, Female VGA, SVGA,
XGA
From any PC, MAC, or
Notebook. A 6 ft highresolution VGA cable is
supplied with unit
AUDIO IN 3.5mm (1/8”)
Mini-Stereo
Line-level
stereo Audio
One 6 ft m/m input cable is
provided for connection to
a PC sound output
CV IN 1 RCA, Female Composite
NTSC or PAL
From any video source
AUDIO IN 3.5mm (1/8”)
Mini-Stereo
Line-level
stereo Audio
CV IN 2 RCA, Female Composite
NTSC or PAL
From any video source
AUDIO IN 3.5mm (1/8”)
Mini-Stereo
Line-level
stereo Audio
S-VID IN MiniDin 4,
Female
Y/C (S-Video,
S-VHS)
AUDIO IN 3.5mm (1/8”)
Mini-Stereo
Line-level
stereo Audio
The output connectors are a HD15-F (VGA), and a 3.5mm (1/8”) MiniStereo audio. Plug your VGA monitor and speakers (must be powered)
to these connectors.
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3. Plug the supplied AC adapter to the Power input connector. Use
the supplied adapter or a 100% equivalent only.
NOTE
Do not connect a supply with an output voltage of greater
than 7.5 V DC to the unit. The power connector is centerpositive.
NOTE
The VGA input connector has standard Pin-out. The VGA output
connector is also standard with the exception that the left and
right audio output are available on two normally undedicated pins
(see table 2.1). These audio outputs are available in addition to
the separate standard audio output connector on the box, and are
normally used in special applications only.
High-Density 15-
pin VGA Output Connector
PIN Function
1 Red
2 Green
3 Blue
4 Right Audio
5 Left Audio
6 Red Return (Gnd)
7 Green Return (Gnd)
8 Blue Return (Gnd)
9 Key (Not Used)
10 Gnd
11 Gnd
12 SDA (plug-n-play)
13 Horizontal Sync
14 Vertical Sync
15 SCL (plug-n-play)
Table 2.1
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3. Operation
Upon plugging in the power, the unit performs a self-test and selects the
video input that was previously selected. To select a different signal,
simply press the push-button on the front of the unit and it will "walk"
the selection to the next inputs (see figure 3.1). You can cycle through
all inputs and select one in this manner.
Alternatively, the AC135A can be controlled by the serial RS232 port
from any computer or RS-232 device (see details in following section).
Front panel LED's indicate the current selection.
If the VGA input is selected, then the unit buffers the signal and passes
it to the output without modification. If the input is from one of the 3
NTSC or PAL channels, the unit automatically converts the signal to
VGA. Line doubling and image processing via digital filtering do the
conversion. The output signal preserves the entire information
contained in the TV input signal, and also improves the way it appears
on the screen by line doubling (de-interlaced). The output resolution
during conversion is 640x480 for NTSC Systems and 768x576 for
PAL. Almost all VGA monitors and LCD's today should automatically
size the image to perfectly fit the screen.
Some VCR's (particularly lower cost ones with no time-base
correction), may not output accurate and clean video signal timing
(especially in FF, REV, or PAUSE modes); however, the AC135A
Figure 2.2
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performs the conversion to VGA regardless. Some VGA monitors or
LCD's may not be able to handle the instability in refresh rate and may
lose the image lock periodically. If this occurs, the solution is to use a
different VCR with time base correction (TBC), change the monitor to
a different brand/model, or use a time-base corrector (or sync stabilizer)
on the input signal from the VCR. DVD players and video cameras do
not exhibit this characteristic, as their signal timing is always very
accurate.
The audio selection switch to the output normally follows the video
input signal. However, you can mix any or all of the audio input signals
to the output (contact factory for details). An example of this can be a
situation in which a line-level microphone feed is connected to one of
the audio inputs and you don't want it to ever be switched off, so when
you switch the input between a PC and a DVD, the MIC. input is
always mixed in with the output.
Inputs
VGA & Audio
From PC
CV #1 & Audio
From A/V source
CV #2 & Audio
From A/V source
S-Video & Audio
From A/V source
Pushbutton Switch to
Select Input
AC135A
Multi-Input Video
Converter
VGA & Audio
LED Indicators
Show Selected Input
RS-232 Control Port
To configure device
characteristics and to allow
selection of input via RS-232
serial commands
Output
Figure 2.3
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4. Configuration
4.1 RS-232 Control and configuration
The AC135A is ready and fully operational right out of the box and no
customer configuration is normally needed.
However, the RS-232 port provided on the box can be used not only to
make input channel selection, but to adjust a few of the internal settings
of the AC135A such as default contrast, brightness, and audio
switching/mixing parameters.
You can use any ASCII terminal emulation software (such as Windows
Hyper Terminal), or contact Black Box to obtain a Windows-based
control and setup program for the AC135A. You would need a straight
through DB9 Male-to-Female cable for connection to a PC.
For example, when using Windows Hyper-Terminal, do the following:
Use Comm. port 1 or 2 of the PC. Configure for 1200 baud, 8 bits, no
parity, one stop bit. Set for ANSI emulation, ASCII with no Local
Echo.
Upon power-up the AC135A restores its previous settings and lists the
ASCII commands on the screen as shown below.
AC135A Rev 2.1 Black Box Corp
-------------------1 = Composite Vid #1
2 = Composite Vid #2
3 = S-Vid
4 = VGA
r = Read Register
w = Write Register
M = More Contrast
L = Less Contrast
--------------------
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The commands for the PC are very simple. Numbers 1 through 4 select
the 4 inputs. In addition two commands are used to write and read from
internal registers and should only be used with caution since some
registers are non-volatile and will not revert back even after powerdown.
To Configure Audio Channels to be mixed or switched:
1. Choose w for write
2. Put in an address of A001, A002, A003, or A004 for CV1,
CV2, SVID, or VGA respectively
3. Put in a data value of 255, if you want that input to always mix
in with the output, or put in 0, to make it switched.
4. Turn device off and then back on.
4.2 Control Panel Software for Windows
Optional Windows-based "Control Panel" software is available for the
AC135A. The software includes options for changing the default
brightness, contrast, audio switching/mixing setup, selecting input
channels, getting a status report, and restoring factory default settings.
If you are interested, please contact the Black Box ftp site or Tech
Support to obtain a copy. You would need a straight-through DB9
Male-to-Female cable for connection to a PC.
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5. Troubleshooting
If your monitor goes blank periodically …
Some VCR's (particularly lower cost ones with no time-base
correction), output jittery and unstable video signal timing (especially
in FF or PAUSE modes); however, the AC135A performs the
conversion to VGA regardless. Some VGA monitors or LCD's may not
be able to handle the instability in refresh rate and may lose the image
lock periodically. If this occurs, the solution is to: use a different VCR
with time base correction (TBC), change the monitor to a different
brand/model, or use a time-base corrector (or sync stabilizer).
If you want to substitute power supplies …
The converter relies on the AC power adapter that is supplied with it.
The adapter generates a floating 6 or 7.5v DC output
Calling Black Box
If you determine that your converter is malfunctioning, do not attempt
to repair the unit. Contact Black Box Tech. Support at 724-746-5500.
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, including:
• The nature and duration of the problem;
• The components involved in the problem—that is, what type of
cable, makes and models of computers and monitors, etc.
Shipping and Packaging
If you need to transport or ship your converter:
• Package it carefully. We recommend that you use the original
container.
• Before you ship the unit back to Black Box for repair or return,
contact us to get a Return Authorization (RA) number.
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6. Specifications
Compliance CE; FCC Part 15 Subpart B Class A, IC Class
Standards VGA, SVGA, or XGA video. RGBHV
Interfaces
Supported Video: VGA, Composite, and S-Video,
Audio: Stereo line-level analog
Serial: RS-232, pinned according to TIA-574, DCE
Video Types VGA Input: to 1600 x 1200 up to 100 Hz
TV Inputs: NTSC or PAL (auto detect)
VGA Output: Same as VGA input, or 640x480 /
800x600 for conversion (NTSC / PAL respectively)
Bandwidth Video: DC to 200 MHz
Video Level 0.7 volts peak-to-peak, on RGB, TTL on H & V
Connectors HD15 for VGA, RCA for CV, MD4 for S-VHS
Temperature
Tolerance Operating: 32 to 122°F (0 to 50°C);
Storage: –40 to +185°F (–40 to +85°C)
Enclosure Steel
MTBF 200,000 hours (calculated estimate)
Power From utility-power (mains) outlet, through included
external power adapters. Output Voltage: 6v DC to 7.5
v DC Center-Positive 750 ma, minimum
Size 6.9" W x 3.3" D x 1.8" H
Weight 1.2. lb box only; 2.7 lb shipping
© Copyright 2001. Black Box Corporation. All rights reserved.
1000 Park Drive Lawrence, PA 15055-1018 724-746-5500 Fax 724-746-0746
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