Audio international VSS-401-x User manual
Audio International, Inc. VSS-401-x Installation and Operation Manual
Document # 540335, Rev IR, 10/2006 Page 1 of 21
Document Revision History
Rev. Level Date Description
IR 10/2006 Initial Release
Reference Documents
Document # Description
525735 VSS-401-x Outline Drawing
Service Bulletin List
Service
Bulletin # Subject Manual
Revision
Revision
Date
Table of Illustrations
Section # Description Page #
2.2.1 Random Select Mode 5
2.2.2 Sequence Select Mode 6
4.8 Cover Plate Removed 16
7.0 Reference Drawings 20-21
PROPRIETARY NOTICE: Despite any other copyright notice, this document and information
disclosed herein contains confidential, proprietary designs owned by Audio International, Inc.
Neither this document nor the data contained herein shall be reproduced, used, or disclosed to
anyone without the written authorization of Audio International, Inc.
Audio International, Inc. VSS-401-x Installation and Operation Manual
Document # 540335, Rev IR, 10/2006 Page 2 of 21
Table of Contents
Section Description Page
1.0 General Information ……………………………………………. 3
1.1 Introduction ……………………………………………………….. 3
1.2 Purpose of the Equipment ………………………………………. 3
1.3 Operational Features…………………………………………….. 3
1.3 Optional Equipment ……………. .………………………………. 4
2.0 Application ……………………………………………………….. 4
3.0 Installation ……………………………………………………….. 8
3.1 Prior to Installation ……………………………………………….. 8
3.2 Unpacking and Inspection ………………………………………. 9
3.3
Cautions & Warnings …………………………………………….. 9
3.4 Wiring Requirements …………………………………………….. 10
3.5 Electrical Characteristics…………………………………………. 11
3.6 Mating Connector Information ……………..……………………. 11
3.7 Pinout Assignment Descriptions ………………………………... 12
3.8 Built-In Test (BIT) Capabilities…………………………………… 13
3.9 Discrete Interfaces………………………………………………... 13
3.10 Return to Last State/Power Up Default…………………………. 13
3.11 Video Interfaces…………………………………………………… 13
4.0 VSS-401-x Operation…………………………………………… 14
5.0 Instructions for Continued Airworthiness ……..………….. 19
5.1 Airworthiness Limitations………………..……………………..… 19
5.2 General Troubleshooting Procedures ………………………….. 19
6.0 Specifications …………………………………………………… 19
7.0 Reference Drawings ……………………………………………. 20
Audio International, Inc. VSS-401-x Installation and Operation Manual
Document # 540335, Rev IR, 10/2006 Page 3 of 21
VSS-401-x
Video Multiplexer
1.0 General Information
1.1 Introduction
This manual contains information for the proper installation of the Audio
International, Inc. (AI) Video Multiplexer, Model No: VSS-401-x. The “-x”
suffix designates the type of connector utilized; “-1” = Positronic and “-2” =
D-Subminiature. Also included are physical and electrical characteristics
of the unit.
1.2 Purpose of the Equipment
Audio International’s VSS-401-x Video Multiplexer provides for the
selection of one to four multi-standard video source inputs to one output.
VSS-401-x also allows customer configuration via DIP switches to select
termination on each input.
1.3 Operational Features
Lightweight, compact size
Solid state circuitry
+28 VDC powered
Optically-isolated discrete inputs.
Status LEDs for channel select status, sequence select input status,
briefer input status, and ±5V power status.
Improved case design to reduce EMI.
Video input signal protection diodes.
Updated multiplexer and video cable driver circuitry.
Improved power input filtering, designed to pass stringent radiated and
conducted EMI testing.
Microprocessor control of mux circuit.
“Return to last state” input, which can be strapped for power-up to last
state.
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1.4 Optional Equipment
Audio International, Inc. offers a comprehensive family of Cabin Control
Modules and Source Equipment, such as DVD players and Videocassette
Players. These modules provide convenient solutions for a variety of
frequently encountered interfacing needs or special requirements and are
an important part of AI’s “building block” system for configuring total cabin
management.
2.0 Application
2.1 Introduction
2.1.1 VSS-401-x allows users to multiplex composite analog video
signals (one to four) inputs to one output while DIP switches allow
for customer configuration. VSS-401-x shall allow customer
configuration via DIP switches to select termination on each input.
Other DIP switches:
Allow the customer to select any one of the four inputs to be
briefer input; and
Allow the customer to select the number of active inputs
(one, two, three or four).
2.1.2 Using two (2) methods, VSS-401-x combines input select
functionality:
Sequential select – one connector pin selects the next-in-
sequence input upon activation
Random select – four connector pins selects the input
designated to that pin.
2.1.3 A single briefer activation pin routes the designated briefer input to
the output upon activation.
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2.2 Typical Application
2.2.1 Random Select Mode
Using up to four (4) momentary switches, each video source may be
selected randomly and routed to the monitor, up to the number of video
sources as configured by DIP switches 3 and 4. When a random select
switch is activated and released, the corresponding video source is
selected. Optionally, a briefer activate toggle switch may be installed.
Upon activation, the video source configured by DIP switches 1 and 2 is
routed to the monitor. Deactivation of the briefer activate switch causes
the previous source to be routed to the monitor. Optional status LEDs
provide a visual indication of the currently selected source. The status pin
will sink sufficient current to drive a standard LED.
Audio International, Inc. VSS-401-x Installation and Operation Manual
Document # 540335, Rev IR, 10/2006 Page 6 of 21
2.2.2 Sequence Select Mode
Using a single momentary switch, each of the video sources is routed to
the monitor, up to the number of video sources as configured by DIP
switches 3 and 4. Each time the sequence select switch is activated and
released, the next highest video source is selected. Upon reaching the
highest-numbered source, the next selection “wraps around” to the lowest.
Optionally, a briefer activate switch causes the previous source to the
routed to the monitor. Optional status LEDs provide a visual indication of
the currently selected source. The status pin will sink sufficient current to
drive a standard LED.
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2.3 Typical Interfaces
2.3.1 Video Input (Analog)
Typical interfaces include various types of video source equipment.
This unit is capable of interfacing and accepting input from all Audio
International and standard Commercial-Off-The-Shelf video source
equipment including but not limited to: Camcorder, Live-Feed
Camera, DVD, VCP and VCR players as well as Moving Map
Systems (i.e., Airshow, JetMAP, etc), and Personal Game
Systems. All video inputs have configurable 75Ωinput termination.
All common video standards (i.e. NTSC, PAL, SECAM) are
supported. Video signal is composite (CVBS).
2.3.2 Video Output (Analog)
Typical interfaces include various video distribution and/or signal
manipulation devices. This unit is capable of interfacing and
providing output to all Audio International and standard
Commercial-Off-The-Shelf video devices and/or equipment
including but not limited to: Video Crosspoint Distribution Modules
(i.e., A/V-9691, AV-3232), LCD display monitors, Plasma display
monitors, Projectors, Personal Display Devices (i.e., Sony
Glasstron) and Touch Screen ECU Modules. The video output is a
series 75Ωback-termination. Unit has a fixed video signal gain of
two, and is intended to drive a 75Ωcable into a 75Ωinput.
2.3.3 Discrete Interface(s)
Typical interfaces include existing aircraft and Commercial-Off-The-
Shelf control and/or indication devices and systems. This unit can
interface, accept, and provide input to and from all such devices
and systems incorporating similar interfaces for communication,
control, and/or status indication. All discrete inputs are ground-
active and optically isolated. Approximately 5mA of current activate
the input. Sufficient input ground potential is up to about +3V
relative to module’s power ground pin.
Status outputs are open-drain type, with customer-supplied current
limiting. Sink current of 10-20mA is recommended and should
never exceed 50mA.
Audio International, Inc. VSS-401-x Installation and Operation Manual
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3.0 Installation
3.1 Prior to installation, the following items should be considered:
3.1.1 During the design and layout of the aircraft cabin, careful
consideration of the location of this module is necessary. Some of
the items to be considered include:
•Space
•Available power supply
•Environmental conditions (temperature, humidity, etc.)
•Length of cable runs
3.1.2 The VSS-401-x shall be installed to conform to the standards
designated by the customer, installing agency, and existing
conditions as to the unit location and type of installation.
3.1.3 Mounting provisions are provided via four (4) 0.16-inch diameter
half-circle cutouts – two (2) on each the left and right sides of unit
on provided mounting flanges. Refer to Section 6.0, Reference
Drawings, for mounting hole diameters and configuration.
3.1.4 This unit is capable of installation/mounting in any orientation
whether horizontal, vertical, inverted, or at an angle.
3.1.5 Installation recommendation requires 1" spacing from other
equipment, modules, and structures except the mounting surface
for which the unit should be in direct contact.
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3.2 Unpacking and Inspection
3.2.1 Carefully open the packaging and remove the VSS-401-x. Verify
that all components have been included in the package per the
packing list. Inspect the unit for damage. Retain the packing
materials and packing list.
3.2.2 If damage has occurred during shipping, a claim should be filed
with Audio International WITHIN 24 hours and a Return Request
Authorization Number shall be obtained from AI by contacting the
Repair Department at 501.801.0640. Repackage the unit in its
original packaging materials and return it to AI following instructions
given by the AI representative. Refer to the front cover of this
manual for address. If no return is necessary, retain the packing
list and the packing materials for storage.
3.3 Cautions and Warnings
3.3.1 It is important to do a pin-to-pin power and ground check on all
connectors. Ensure that power and ground are applied only where
specified. Damage to the unit may result if power or ground is
applied to the wrong points.
3.3.2 DO NOT connect or disconnect the monitor while power is applied.
3.3.3 DO NOT remove any factory-installed screws. Damage to the unit
may result and void any warranties.
3.3.4 DO NOT expose to moisture.
3.3.5 ESD (Electro Static Discharge) guidelines shall be followed.
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3.4 Wiring Requirements
3.4.1 Introduction
The installing agency shall supply and fabricate all external cables
and mating connectors. The length and routing of external cables
should be carefully studied and planned before attempting
installation of the equipment. Allow adequate space for installation
of cable and connectors. Avoid sharp bends and placing cables
near aircraft control cables. Maintain a minimum clearance of three
(3) inches from any control cable. If wiring is run parallel to
combustible fluid or oxygen lines, maintain a separation of six (6)
inches between the lines.
3.4.2 Grounding and Bonding
This unit provides for common circuit ground and chassis ground
connections. Both circuit and chassis grounds are referenced to
pin two (2) of connector P1. Circuit/chassis ground connection
shall be bonded to an electrically conductive chassis mounting
point or frame ground with less than 0.100 Ωresistance using less
than 50 Ωimpedance cable.
3.4.3 Product Wire Bundle and Supply Harness Wire Type / Gauge
Power and ground connections are recommended to use 22 AWG,
minimum, wiring in accordance with MIL-W-22759 or equivalent.
All analog composite video connections are recommended to use
shielded coaxial cable in accordance with M17/94-RG179 or
equivalent.
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3.5 Electrical Characteristics
3.5.1 Electrical Specifications for VSS-401-x:
Electrical Nominal Power 50 mA @ +28 VDC
Maximum Power 200 mA @ +28 VDC
Operating Voltage
Range +18 to +32 VDC
Video Interfaces
Various analog video
standards (NTSC, PAL,
SECAM, etc.)
Input Impedance 75 Ω(configurable)
Output Impedance 75 Ω
3.5.3 The VSS-401-x utilizes 6 connectors. P1 is a 9-pin connector
providing power, ground, sequence switch input, status, return to
last state input, and briefer active.
3.5.4 BNC1 through BNC4 provide video input.
3.5.5 BNC1 provides video output.
3.6 Mating Connector Information
All wiring harnesses to the unit shall be supplied and fabricated by the
installing agency.
P1 CONNECTOR
PART NUMBER MATING CONNECTOR
VSS-401-1 RD9F10JVL0 or equivalent
(Positronic Industries)
VSS-401-2 DBMA-9 w/ Male Screwlocks or equivalent
(ITT Cannon)
BNC1 through BNC5
PART NUMBER MATING CONNECTOR
VSS-401-x (all versions) 31-70008 (Amphenol) or equivalent
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3.7 Pinout Assignment Descriptions
P1
Pin # Description
1 +28VDC Power
2 Power Ground
3 Sequence Switch Input (GND active)
4 Status #1 output/Random select #1 input (GND Active)
5 Status #2 output/Random select #2 input (GND Active)
6 Status #3 output/Random select #3 input (GND Active)
7 Status #4 output/Random select #4 input (GND Active)
8 Return To Last State Input (GND Active)
9 Briefer Activate Input (GND Active)
BNC1 Through BNC4
Pin # Description
1 (Center) Video (+) INPUT
2 (Shield) Video (-) INPUT
BNC5
Pin # Description
1 (Center) Video (+) OUTPUT
2 (Shield) Video (-) OUTPUT
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3.8 Built-In-Test (BIT) Capabilities
External status LEDs aid in determination of state of ±5V power supplies,
sequence select input, briefer activation input, and currently selected
input. These LEDs provide simple diagnostics to test for shorted inputs to
the VSS-401.
When powering up, if any of the input select pushbuttons or sequence
button inputs are active, this is considered a fault condition. The status
LEDs will blink on and off until the fault condition is cleared. The status
LED associated with the input with the fault condition, will not blink, but will
remain in the ON state. When the fault condition is cleared, only the status
LED associated with the active input will remain lit.
3.9 Discrete Interfaces
Active and inactive states for each input are defined below as follows:
PIN NUMBER ACTIVE STATE INACTIVE STATE
P1-3 through
P1-7
Momentary Ground
(< +3.0VDC for >50msec) Open (pulled up to apx +28V)
P1-8 Mom or Const GND (<+3VDC ) Open (pulled up to apx +28V)
P1-9 Constant Ground (<+3VDC ) Open (pulled up to apx +28V)
Active and inactive states for each output are defined below as follows:
PIN NUMBER ACTIVE STATE INACTIVE STATE
P1-4 through P1-7 Constant Ground (< +0.1VDC) Open (pulled up to apx +28V)
Pins P1-4 through P1-7 serve as both active inputs and outputs.
3.10 Return To Last State / Power Up Default
Upon power-up, processor determines state of pin P1-8. If grounded, unit
sets the input channel selection to the last state prior to previous power-
down. If pin P1-8 is not grounded, unit selects Input #0 as the power-up
default.
During operation, if pin P1-8 is set to ground, unit shall select the previous
input channel (last state).
3.11 Video Interfaces
All video interfaces are consistent with standard composite analog video
signals, 1 V(p-p) nominal. Unit is capable of handling various analog video
standards (NTSC, PAL, SECAM, etc.)
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4.0 VSS-401-x Operation
VSS-401-x may be operated in two modes: SEQUENCE SELECT and
RANDOM SELECT.
4.1 Sequence Select Mode
A momentary switch connected to the SEQUENCE SELECT PIN, when
activated and released, causes the next video source to be routed to the
video output. If the video source is at the highest-numbered input,
pressing and releasing the SEQUENCE SELECT PIN causes the router to
“wrap-around” to the first video source. The highest-numbered input is
determined from the configuration DIP switches #3 and #4.
4.2 Random Select Mode
Momentary switches connected to each of the four OUTPUT STATUS /
RANDOM SELECT PINs, when activated and released, routes the
corresponding video source to the video output. Selecting the same
source as the current selection has no effect. If a source is selected that
is higher than the number of sources configured by DIP switches #3 and
#4, it will not be selected. The OUTPUT STATUS / RANDOM SELECT
PINs share the same physical connector pin.
4.3 Output Status
In both SEQUENCE SELECT and RANDOM SELECT modes, the
OUTPUT STATUS / RANDOM SELECT PINs can be used as external
status indicators. The currently selected source’s corresponding OUTPUT
STATUS pin will be actively driven to ground. This pin is capable of
sinking sufficient current to drive an LED. Ensure the LED has a current-
limiting resistor of sufficient power rating. Sink current of 10-20mA is
recommended and should never exceed 50mA.
4.4 Briefer Activate Pin
Optionally, a toggle switch to the BRIEFER ACTIVATE PIN may be
connected. DIP switches #1 and #2 are used to configure the designated
briefer input. The toggle switch should connect the BRIEFER ACTIVATE
PIN to ground. Upon de-activation of the the BRIEFER ACTIVATE PIN
(open switch), the previously selected input is routed to the video output.
Note: the designated briefer input may be any of the four available inputs
and is completely independent of the number of inputs (configured with
DIP switches #3 and #4). If briefer functions are not required, leave the
BRIEFER ACTIVATE PIN unconnected (open).
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4.5 Power Up Defaults And Last State Pin
Video source #1 is the power up default. Power up default cannot be
configured to any other input.
Upon power-up, the VSS-401-x checks the state of the LAST STATE PIN.
If this pin is grounded, the VSS-401-x retrieves the input that was active
when it was powered down and routes that input to the output. To always
select video source #1 at power up, leave the LAST STATE PIN
unconnected (open).
4.6 Internal Status Leds
Eight LEDs, located next to connector P1, provide status indication of
various internal functions and may be useful for configuration and
troubleshooting. Power supply status LEDs indicate internal +5V and -5V
supply operation. Sequence Sel and Briefer Active LEDs indicate the
status of the SEQUENCE SELECT PIN and BRIEFER ACTIVATE PIN,
respectively. Grounding either of these pins will cause their corresponding
LED to illuminate. The four Status LEDs will illuminate when the
corresponding OUTPUT STATUS / RANDOM SELECT pin is activated
(grounded) or to indicate which input channel is currently selected. Note
these four Status LEDs provide the same status information as the
OUTPUT STATUS / RANDOM SELECT PINs.
4.7 Power Up Switch Input Tests
Upon power up, the VSS-401 checks the state of the SEQUENCE
SELECT PIN, all four STATUS OUTPUT / RANDOM SELECT PINs, and
the BRIEFER ACTIVATE PIN. If any of these inputs are grounded at
power up, the VSS-401-x assumes a fault condition. No input selection
can be made until the fault condition is cleared. That is, normal operation
will not begin until the VSS-401-x detects all these inputs are open (NOT
grounded). A fault condition is indicated by the simultaneous blinking of
the Status LEDs (and STATUS OUTPUT / RANDOM SELECT PINs). Tthe
LED associated with the input with the detected fault will remain in the ON
state and will not blink. If this occurs, ensure that all these inputs are open
(NOT grounded). The VSS-401-x will begin normal operation. If normal
operation does not begin even after all inputs are opened, an internal
malfunction may be present.
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4.8 Configuration Dip Switches
Eight DIP switches allow the VSS-401-x to be configured as needed. Use
a standard Phillips head screwdriver to remove the cover plate on the front
of the unit:
Cover Plate
Cover Plate removed
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Table #1 lists the possible DIP Switch configurations.
DIP switches #1 and #2 select the briefer video input source. This input is
routed to the output upon activation of the BRIEFER SELECT PIN.
DIP switches #3 and #4 select the number of available input sources –
one to four. Note: when configured for only one video source, the
SEQUENCE SELECT PIN and OUTPUT STATUS / RANDOM SELECT
PINs have no functionality. However, a different briefer video input may
be chosen using DIP switches #1 and #2. Configured this way, activation
of the BRIEFER SELECT PIN routes the designated briefer video source
to the output. Deactivation of the BRIEFER SELECT PIN returns the input
video source to Input #1.
DIP switches #5 through #8 select 75Ωtermination for each input.
Normally, video sources are back-terminated with 75 Ω to match
interconnecting cabling impedance. If termination is no concern, these
input terminations may be turned off. When un-terminated, the input
impedance is high (>10K Ω).
Table 1: Configuration DIP Switch Table
Switch # Description Function
1 Briefer Channel Select 1 1 OFF/2 OFF = Input #1; 1 ON/2 OFF = Input #2
2 Briefer Channel Select 2 1 OFF/2 ON = Input #3; 1 ON/2 ON = Input #4
3 Number of inputs 1 3 OFF/4 OFF = Inputs 1,2,3,4. 3 ON/4 OFF = Inputs 1,2,3
4 Number of inputs 2 3 OFF/4 ON = Inputs 1,2. 3 ON/4 ON = Input 1.
5 Input #4 Termination ON = input is terminated (75Ω)
6 Input #3 Termination ON = input is terminated (75Ω)
7 Input #2 Termination ON = input is terminated (75Ω)
8 Input #1 Termination ON = input is terminated (75Ω)
As shipped from factory, configuration DIP switches are set to mimic
operation of most-often ordered model(s).
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Table 2: VSS-401 Configuration Settings to Replicate Existing Models
To emulate other Audio International Video Selectors, simply arrange DIP
Switches as shown:
Old Model 1 2 3 4 5 6 7 8
VSS-02-NT OFF OFF OFF ON OFF OFF OFF OFF
VSS-02(-T) OFF OFF OFF ON ON ON ON ON
VSS-02-03 ON OFF OFF ON ON ON ON ON
VSS-02-03-NT ON OFF OFF ON OFF OFF OFF OFF
VSS-02-04-NT OFF OFF OFF ON OFF OFF OFF OFF
VSS-02-04-T OFF OFF OFF ON ON ON ON ON
VSS-03 OFF OFF ON OFF ON ON ON ON
VSS-03-NT OFF OFF ON OFF OFF OFF OFF OFF
VSS-03-T OFF OFF ON OFF ON ON ON ON
VSS-03-06-T OFF OFF ON OFF ON ON ON ON
VSS-04 OFF OFF OFF OFF ON ON ON ON
VSS-04-T OFF OFF OFF OFF ON ON ON ON
VSS-04-NT OFF OFF OFF OFF OFF OFF OFF OFF
VSS-04-02-NT OFF OFF OFF OFF OFF OFF OFF OFF
VSS-04-02-T OFF OFF OFF OFF ON ON ON ON
VSS-04-08-NT OFF OFF OFF OFF OFF OFF OFF OFF
VSS-04-08-T OFF OFF OFF OFF ON ON ON ON
VSS-02-01 OFF OFF OFF ON ON ON ON ON
VSS-02-02 ON OFF OFF ON ON ON ON ON
VSS-03-05 OFF OFF ON OFF ON ON ON ON
VSS-03-05-T OFF OFF ON OFF ON ON ON ON
VSS-03-06-NT OFF OFF ON OFF OFF OFF OFF OFF
VSS-04-02 OFF OFF OFF OFF ON ON ON ON
VSS-04-06 OFF OFF OFF OFF ON ON ON ON
VSS-04-07 OFF OFF OFF OFF OFF OFF OFF OFF
Notes: Switch # 1 2 DIP SWITCHES 1 and 2 select VIDEO BRIEFER:
OFF OFF First video input is briefer
ON OFF Second video input is briefer
OFF ON Third video input is briefer
ON ON Fourth video input is briefer
Models that do not use briefer - do not connect to briefer pin.
Switch # 3 4 DIP SWITCHES 3 and 4 select number of input channels:
OFF OFF Four inputs (VSS-04)
ON OFF Three inputs (VSS-03)
OFF ON Two inputs (VSS-02)
ON ON One input
DIP SWITCHES 5-8 select input termination:
ON Input is terminated (75 ohm)
OFF Input is not terminated (high impedance)
For no dash and -T models, inputs are terminated.
For -NT models, inputs are not terminated.
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5.0 Instructions for Continued Airworthiness
5.1 Airworthiness Limitations
No periodic scheduled maintenance or calibration is required for continued
airworthiness of the VSS-401-x. If the unit fails to perform to
specifications, it must be removed and serviced by a qualified service
facility.
5.2 General Troubleshooting Procedures
•Verify power to the unit by rechecking +28 VDC power is applied to the
proper pins on the unit. Use a voltmeter to verify correct level.
•Remove power from the unit for at least one (1) minute and reapply
power.
•Recheck all connections to the unit for security. Check all harness
runs for possible pinching. Recheck all pinouts for application
accuracy.
6.0 Specifications
Physical Specifications – VSS-401-x
Weight Approx. 0.6 lb / 0.27 kg
Dimensions
(l x w x h)
5.0" x 3.08" x 1.05"
12.7 cm x 7.82 cm x 2.67 cm
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