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S768DAV – S7768DAV
p
Fiber O
tic Transmission System
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© 2003 GE Interlogix, Video Systems Group
All Rights Reserved.
Any GE Interlogix, Video Systems Group, software
supplied with GE Interlogix, Video Systems Group,
products is proprietary and furnished under license
and can be used or copied only in accordance with
the terms of such license.
This document contains proprietary information that is
protected by copyright. No part of this document may
be reproduced or transmitted in any form or by any
means without the prior written permission of
GE Interlogix, Video Systems Group.
The information contained in this document is subject
to change without notice. GE Interlogix, Video
Systems Group, in keeping pace with technological
advances, is a company of product innovation.
Therefore, it is difficult to ensure that all information
provided is entirely accurate and up-to-date.
GE Interlogix, Video Systems Group, accepts no
responsibility for inaccuracies or omissions and
specifically disclaims any liabilities, losses, or risks,
personal or otherwise, incurred as a consequence,
directly or indirectly, of the use or application of any of
the contents of this document.
For the latest product specifications, visit
GE Interlogix, Video Systems Group, online at
www.GE-Interlogix.com or contact your GE Interlogix,
Video Systems Group, sales representative.
This equipment has been tested and
found to comply with the limits for a
Class A digital device, pursuant to part
15 of the FCC Rules. These limits are
designed to provide reasonable
protection against harmful interference
when the equipment is operated in a
commercial environment. This
equipment generates, uses, and can
radiate radio frequency energy and, if
not installed and used in accordance
with the instruction manual, may cause
harmful interference to radio
communications.
You are cautioned that any changes or
modifications not expressly approved by
the party responsible for compliance
could void the user's authority to
operate the equipment.
For technical support before and after installation, call 800-469-1676.
Technical support is available 24 hours a day, 7 days a week.
Call: Tech Support 800-469-1676 (6 A.M. – 5 P.M. PST Monday through Friday)
Tech Support 541-740-3589 (all other times)
Main 800-343-3358 or 541-754-9133
Fax: Tech Support 541-752-9096 (available 24 hours a day)
Main 541-754-7162
Web: www.GE-Interlogix.com
11-0768DAV-B / December 2003
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S768DAV – S7768DAV User Manual Table of Contents
TABLE OF CONTENTS
BEFORE YOU BEGIN ..........................................................................................................5
1 INTRODUCTION ............................................................................................................ 7
2 MODULE SETUP ..........................................................................................................8
2.1 U
2.2 D
2.3 I
NPACKING THE UNIT .......................................................................................... 8
ATA TRANSLATION ............................................................................................ 8
NPUT/OUTPUT DATA FORMAT.............................................................................. 8
2.3.1 MANUAL DATA SELECTION ......................................................................... 9
2.3.2 AUTO DATA CONFIGURATION.................................................................... 10
2.4 OPTICAL/VIDEO ALARMS.................................................................................... 10
2.5 V
2.6 A
2.7 I
IDEO FORMAT/TEST PATTERN GENERATOR....................................................... 11
UDIO LEVEL .................................................................................................... 11
NPUT IMPEDANCE ............................................................................................. 12
3 INSTALLATION ...........................................................................................................13
3.1 RACK CARDS.................................................................................................... 13
3.2 502R R
3.3 C
ONNECTIONS .................................................................................................. 14
3.3.1 BACK PANEL CONNECTIONS ..................................................................... 15
3.3.2 INTERFACE BOARD CONNECTIONS ............................................................ 16
ACK CARD ENCLOSURES ....................................................................... 13
3.3.3 BUILT-IN TERMINATION ............................................................................ 19
3.3.4 VIDEO CABLE CONNECTIONS.................................................................... 20
3.3.5 AUDIO CONNECTIONS .............................................................................. 20
3.3.6 FIBER OPTIC CABLE CONNECTIONS .......................................................... 20
3.3.7 STANDALONE MODULE POWER CONNECTIONS........................................... 21
3.3.8 RACK MODULE POWER CONNECTIONS ...................................................... 21
4 OPERATION...............................................................................................................22
4.1 N
4.2 LED O
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ORMAL OPERATION ......................................................................................... 22
PERATION .............................................................................................. 22
4.2.1 LASER INDICATOR ................................................................................. 22
4.2.2 LEVEL/LOSS INDICATOR ....................................................................... 23
4.2.3 VIDEO IN/OUT INDICATORS ................................................................... 23
4.2.4 AUDIO 1, 2 IN/OUT INDICATORS ............................................................ 23
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Table of Contents S768DAV – S7768DAV User Manual
4.2.5 DATA 1, 2 IN/OUT INDICATORS.............................................................. 23
4.2.6 CONTACT 1, 2 IN/OUT INDICATORS ...................................................... 24
4.2.7 ENABLED 1, 2 INDICATORS.................................................................... 24
4.3 V
4.4 T
IDEO TEST PATTERNS ..................................................................................... 24
EST MODE ...................................................................................................... 24
5 TROUBLESHOOTING...................................................................................................26
A
PPENDIX A: RS485 APPLICATION NOTES....................................................................... 27
A.1 INTRODUCTION ................................................................................................. 27
A.2 C
A.3 CONFIGURATION ............................................................................................... 27
A.4 T
ONNECTION .................................................................................................... 27
ERMINATION.................................................................................................... 27
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S768DAV – S7768DAV User Manual Before You Begin
BEFORE YOU BEGIN
Read these instructions before installing or operating this product.
Note: This installation should be made by a qualified service person and should conform to local codes.
This manual provides installation and operation information. To use this document, you must have the
following minimum qualifications:
! A basic knowledge of CCTV systems and components
! A basic knowledge of electrical wiring and low-voltage electrical hookups
Intended use
Use this product only for the purpose for which it was designed; refer to the product specification and user
documentation.
Customer Support
For assistance in installing, operating, maintaining, and troubleshooting this product, refer to this
document and any other documentation provided. If you still have questions, please contact
Technical Support and Sales:
GE Interlogix, Video Systems Group
Call: 800-469-1676
Fax: 541-752-9096
Note: You should be at the equipment and ready with details before calling Technical Support.
Conventions Used in this Manual
Boldface or button icons highlight command entries. The following WARNING, CAUTION, and Note
statements identify potential hazards that can occur if the equipment is handled improperly:
* WARNING:
Improper use of this equipment can cause severe bodily injury or equipment damage.
** CAUTION:
Improper use of this equipment can cause equipment damage.
Note: Notes contain important information about a product or procedure.
* This symbol indicates electrical warnings and cautions.
** This symbol indicates general warnings and cautions.
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Before You Begin S768DAV – S7768DAV User Manual
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S768DAV – S7768DAV User Manual Introduction
1 INTRODUCTION
This is a guide to the installation and operation of the S768DAV and S7768DAV series fiber optic video,
audio, data, and contact closure transmission system. Please read the entire manual before installing the
equipment.
NOTE: The series numbers S768DAVT and S768DAVR are used to describe all models of transmitters and receivers unless noted
otherwise.
The Series S768DAV and S7768DAV transmission systems offer simultaneous real-time transmission of:
! One channel of two-way 9-bit digital video
! Two channels of two-way high quality audio (HQA)
! Two channels of two-way multi-protocol data (MPD)
! Two channels of two-way relay/contact closures
The S768DAV system operates over one or two multimode fibers and the S7768DAV uses one or two
single-mode fibers. A complete system consists of an S768DAVT transmitter and an S768DAVR receiver.
Units are designed for installation in the 515R1 or 517R1 Card Cages or in the 502R rack card enclosure.
Figure 1 shows a basic system diagram.
Figure 1. S768DAV System Diagram
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Module Setup S768DAV – S7768DAV User Manual
2 MODULE SETUP
2.1 UNPACKING THE UNIT
In the event that anything is missing from the following list, contact your authorized dealer or
representative.
! S768DAVT (S7768DAVT) Transmitter or S7768DAVR (S7768DAVR) Receiver
! User Manual
Save the original packing materials in case it becomes necessary to return the unit.
CAUTION:
Take all necessary precautions to protect the unit from static electricity during the following procedures.
Equipment damage may result.
2.2 DATA TRANSLATION
The data translation capability of the S768DAV series is unique in the industry. It enables translation from
one data format to another and eliminates the need for external translation devices.
The translation is in the physical layer only; it cannot interpret specific protocols or translate commands.
Due to the encoding schemes utilized in Manchester and Biphase, these formats are exempt from
translation. Data translation examples are shown in Table 1.
Table 1. Data Translations
Translation TX Switch
Setting
TTL to RS232 three-wire 3 1 Signal level conversion
RS232, three-wire to TTL 1 3 Signal level conversion
TTL to RS422 3 4 Single ended to differential conversion
RS422 to TTL 4 3 Differential to single ended conversion
RS232, three-wire to RS422 1 4 Single ended to differential conversion
RS422 to RS232, three -wire 4 1 Differential to single ended conversion
RS232, five-wire to RS485 2 7 - A RS232 handshaking bit is used to indicate tri-state
RX Switch
Setting
Comments
RS485 to RS232, five-wire 7 – A 2 Tri-State detection circuitry activates handshaking bit
2.3 INPUT/OUTPUT DATA FORMAT
Determine the data formats required for input and output for both data channels. The data formats may
be the same or different for each channel. The data format can also differ from input to output on the
same data channel.
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S768DAV – S7768DAV User Manual Module Setup
2.3.1 MANUAL DATA SELECTION
To set the data format for channels 1 and 2, see Figure 2, Figure 3, Table 2 and perform the following.
1) Select a data format for each Data channel on the transmitter using DATA SELECT switch SW1
(channel 1) and SW2 (channel 2).
2) Select a data format for each Data channel on the receiver using DATA SELECT switch SW1
(channel 1) and SW2 (channel 2).
NOTE: The DATA SELECT switches, SW1 and SW2 on the audio/data card, are shipped in the Auto Configure setting (position 0).
SW1 SW7 SW5 SW4 SW6
SW3 SW8 SW2
Figure 2. S768DAV Location of Switches
Figure 3. DATA SELECT Switches SW1 and SW2
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Module Setup S768DAV – S7768DAV User Manual
Table 2. DATA SELECT SW1/SW2 Settings
Setting Data Mode Setting Data Mode
0 Not Configured or Auto Configuration 8 RS485 two -wire, 2V offset
1 RS232 9 RS485 four-wire standard
2 RS232 with handshake A RS485 four-wire, 1V offset
3 TTL B RS485 four-wire, 2V offset
4 RS422 two-wire C Not used
5 Manchester/Biphase D Not used
6 RS485 two-wire Standard or SensorNet E Receiver Test mode
7 RS485 two -wire, 1V offset F Transmitter Test mode
2.3.2 AUTO DATA CONFIGURATION
The S768DAV modules can be set for Auto Data Configuration, where the format of the data on channel
1 or channel 2 is controlled from one unit, either the transmitter or the receiver. To use the Auto Data
Configuration feature, perform the following.
1) Set the DATA SELECT switches SW1 or SW2 on one unit to position 0 (default setting).
2) Set the DATA SELECT switches SW1 or SW2 on the other unit to the desired format.
3) If the data format needs to be changed for a particular channel, only the DATA SELECT switches
on one unit need to be changed. The other unit remains in position 0 and will auto-configure
according to the selected data format.
2.4 OPTICAL/VIDEO ALARMS
Rack cards are supplied with alarm functions that activate if the optical or video signal input to the module
fails. These alarms can be output to the rack power supply, where an audible alarm and alarm output
contact closure can be activated. The optical and video alarms are controlled using DIP switch SW3 on
the audio/data card. To set the optical and video alarms, see Figure 2 and Figure 4 and perform the
following.
Figure 4. ALARM Switch SW3
1) Set switch SW3-1 to ON to enable the FIBER (optical) alarm.
2) Set SW3-2 to ON to enable the VIDEO alarm.
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S768DAV – S7768DAV User Manual Module Setup
3) If the optical or video alarm output is not desired, set the corresponding DIP switch (SW3-1 or
SW3-2) to OFF.
NOTE: Setting ALARM switches SW3-1 and SW3-2 to OFF does not affect the operation of the LEVEL/LOSS or VIDEO LEDs. A
red LED always indicates signal loss.
2.5 VIDEO FORMAT/TEST PATTERN GENERATOR
The S768DAV links support both NTSC and PAL video standards without adjustment. DIP switch SW8 on
the S768DAVT transmitter and S768DAVR receiver audio/data cards enable the test pattern generator
and select the video format. To enable the test pattern generator and set the video format, see Figure 2
and Figure 5 and perform the following.
Figure 5. VIDEO FORMAT/TEST PATTERN GENERATOR Switch SW8
1) Set DIP switch SW8 on the transmitter and receiver to the desired position.
2) Ensure the switches on the transmitter and receiver are set to the same video format.
NOTE: In order for the test pattern generator to operate properly, both the transmitter and receiver must be set to the same format.
2.6 AUDIO LEVEL
The S768DAV system features dual audio level operation to meet the system requirements of -10 dBu
audio reference and 0 dBu/+4 dBu audio reference level. All units are shipped with the audio level
switches set to 18 dBu (0 dBu audio reference level). At this setting, the 18 dB of operating range will
support maximum audio levels of +18 dBu. Switches SW4, SW5, and SW7 on the audio/data card select
the input and output audio levels. To set the audio levels, see Figure 2 and Figure 6 and perform the
following.
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Module Setup S768DAV – S7768DAV User Manual
Figure 6. AUDIO LEVEL Switches SW4, SW5, and SW7
1) If a low audio input level causes the output audio signal to degrade, the input sensitivity of the
S768DAV can be increased by switching to the 8 dBu maximum scale.
2) For systems running at -10 dBu, typical for VCRs and DVD players, switches SW4, SW5, and SW7
should be set to 8 dB.
3) You can set the transmitter input to 8 dBu and the receiver output to 18 dBu to add 10 dB of gain to
the system, however, this also increases system signal-to-noise ratio (S/N).
2.7 INPUT IMPEDANCE
The S768DAV units are shipped with the input impedance set at high impedance (high-Z). To select a
600Ω input impedance in place of the high-Z input, set switch SW6 on the audio/data card to 600. See
Figure 2 and Figure 7.
Figure 7. IMPEDANCE Switch SW6
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S768DAV – S7768DAV User Manual Installation
3 INSTALLATION
This fiber-optic link is supplied as a rack card. The rack cards can also be used in a standalone
configuration if placed in a 502R rack card enclosure.
Units should be installed in dry locations protected from extremes of temperature and humidity.
3.1 RACK CARDS
Rack cards are installed in a 19-inch (483-mm), EIA standard card-cage rack, either the 515R1 or the
517R1. Follow these guidelines to install rack cards.
CAUTION:
Although rack cards are hot-swappable and can be installed without turning off power to the rack, the
power switch on the rack power supply should be turned off and the rack power supply disconnected
from any power source before installing rack cards.
1) Make sure that the card is oriented right-side up, and slide it into the card guides in the rack until the
edge connector at the back of the card seats in the corresponding slot in the rack’s connector panel.
Seating may require thumb pressure on the top and bottom of the card’s front panel.
CAUTION:
Do not press on any of the LEDs when installing cards into the rack. Equipment damage may result.
2) Tighten the two thumbscrews on the card until the front panel of the card is seated against the front
of the rack.
3.2 502R RACK CARD ENCLOSURES
To install rack cards in the 502R rack card enclosure, see Figure 8 and perform the following.
CAUTION:
The rack card module can be powered only by 13.5 - 16 VDC. AC power must not be used. It is
recommended that the 613P power adapter be used to supply power to the module. Damage to the
equipment may result if AC power is used.
CAUTION:
Complete all instruction steps before supplying power to the unit.
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1) Look inside the enclosure to determine the location of the socket for the edge connector on the
card. Orient the card so that it will seat in the socket, and slide it into the card guides in the
enclosure until the edge connector at the back of the card seats in the socket. Seating may require
thumb pressure on the top and bottom of the card’s front panel.
CAUTION:
Do not to press on any of the LEDs when installing cards into the enclosure. Equipment damage may
result.
2) Tighten the two thumbscrews on the card until the front panel of the card is seated against the front
of the enclosure.
3) Determine where the module will be installed, and ensure that there is adequate space for making
the various cable connections and for reading the diagnostic LEDs.
NOTE: The type of screws chosen must be suitable for the surface on which the module is to be mounted.
4) Standalone modules can be attached to suitable flat surfaces with four No. 6 (3 mm) screws. After
the enclosure is securely attached to a flat surface, the cable connections can be made.
Figure 8. 502R Rack Card Enclosure Mounting Data
3.3 CONNECTIONS
All video, audio, data, contact, and fiber connections are made to the back panel of the S768DAV
module. When connecting audio, data, or contact signals, always wire the signal OUT pins on the
audio/data equipment to the signal IN pins on the fiber links, and the signal IN pins on the audio/data
equipment to the signal OUT pins on the fiber links. See Figure 9.
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S768DAV – S7768DAV User Manual Installation
Audio/Data Equipment S768DAV Link
Figure 9. S768DAV Fiber Link Audio – Data – Contact Connections
3.3.1 BACK PANEL CONNECTIONS
Audio, data, and contact signals can be connected directly to the unit by wiring a 26-pin male D-connector
(AMP plug part number 748474-1, pin part number 748333-4) and attaching it to audio/data connector J4
on the back panel of the unit. See Figure 10. Table 3 lists the signal and pin information.
Audio/Data
Video Out
Optical In
Optical Out
Video In
Note: Optical In connector is not present on 1-Fiber models.
Figure 10. S768DAV 2-Fiber Module Back Panel Connections
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Table 3. J4 Audio/Data Connections
Pin Signal Pin Signal
1 AUDIO CHANNEL 1 OUT + 14 AUDIO CHANNEL 1 IN -
2 GROUND 15 AUDIO CHANNEL 2 IN +
3 AUDIO CHANNEL 2 OUT - 16 GROUND
4 CONTACT CHANNEL 1 IN + 17 DATA CHANNEL 1 OUT -
5 AUDIO CHANNEL 1 IN + 18 DATA CHANNEL 1 IN -
6 AUDIO CHANNEL 2 IN - 19 CONTACT CHANNEL 2 OUT -
7 DATA CHANNEL 1 OUT + 20 CONTACT CHANNEL 1 OUT +
8 DATA CHANNEL 1 IN + 21 CONTACT CHANNEL 1 OUT -
9 DATA CHANNEL 2 IN - 22 +5 VDC BIAS
10 CONTACT CHANNEL 2 OUT + 23 GROUND
11 AUDIO CHANNEL 1 OUT - 24 DATA CHANNEL 2 OUT +
12 AUDIO CHANNEL 2 OUT + 25 DATA CHANNEL 2 OUT -
13 CONTACT CHANNEL 2 IN + 26 DATA CHANNEL 2 IN +
3.3.2 INTERFACE BOARD CONNECTIONS
The S768DAV units are also supplied with an interface board that attaches directly to the back of the
module. The interface board contains screw terminal connectors for the audio, data, and contact inputs
and outputs. Refer to Figure 11 and Table 4 through Table 14 for interface board wiring information.
J2 J4 J6
J1
Mates with J4
on S768DAV
Back Panel
J3 J5 J7
Figure 11. S768DAV Interface Board
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Table 4. Interface Board Connections
Pin Signal Pin Signal
Connector J2 Connector J3
1 GROUND 1 GROUND
2 DATA CHANNEL 1 OUT + 2 DATA CHANNEL 2 OUT +
3 DATA CHANNEL 1 OUT - 3 DATA CHANNEL 2 OUT -
4 +5 VDC BIAS 4 +5 VDC BIAS
5 DATA CHANNEL 1 IN + 5 DATA CHANNEL 2 IN +
6 DATA CHANNEL 1 IN - 6 DATA CHANNEL 2 IN -
7 TERMINATION 7 TERMINATION
8 GROUND 8 GROUND
Connector J4 Connector J5
1 AUDIO CHANNEL 1 IN + 1 AUDIO CHANNEL 2 IN +
2 AUDIO CHANNEL 1 IN - 2 AUDIO CHANNEL 2 IN -
3 GROUND 3 GROUND
4 AUDIO CHANNEL 1 OUT + 4 AUDIO CHANNEL 2 OUT +
5 AUDIO CHANNEL 1 OUT - 5 AUDIO CHANNEL 2 OUT -
6 GROUND 6 GROUND
Connector J6 Connector J7
1 CONTACT CHANNEL 1 IN + 1 CONTACT CHANNEL 2 IN +
2 CONTACT CHANNEL 1 IN - 2 CONTACT CHANNEL 2 IN -
3 CONTACT CHANNEL 1 OUT + 3 CONTACT CHANNEL 2 OUT +
4 CONTACT CHANNEL 1 OUT - 4 CONTACT CHANNEL 2 OUT -
Table 5. J2/J3 Connections for RS232 Data
SW1 / SW2 – Position 1
Pin Signal
1 GROUND/SHIELD
2 RS232 OUT
3 NO CONNECTION
4 NO CONNECTION
5 RS232 IN
6 NO CONNECTION
7 NO CONNECTION
8 GROUND
Table 6. J2/J3 Connections for RS232 Data with
Handshaking
SW1 / SW2 – Position 2
Pin Signal
1 GROUND/SHIELD
2 RS232 OUT
3 RTS/CTS OUT
4 NO CONNECTION
5 RS232 IN
6 RTS/CTS IN
7 NO CONNECTION
8 GROUND
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Table 7. J2/J3 Connections for TTL Data
SW1 / SW2 – Position 3
Pin Signal
1 GROUND/SHIELD
2 NO CONNECTION
3 TTL OUT
4 NO CONNECTION
5 TIE TO PIN 1
6 TTL IN
7 NO CONNECTION
8 GROUND
Table 9. J2/J3 Connections for Manchester/Biphase Data
SW1 / SW2 – Position 5
Pin Signal
1 MANCHESTER/BIPHASE OUT -
2 MANCHESTER/BIPHASE OUT +
3 NO CONNECTION
4 NO CONNECTION
5 MANCHESTER/BIPHASE IN -
6 MANCHESTER/BIPHASE IN +
7 NO CONNECTION
8 GROUND
Table 8. J2/J3 Connections for RS422 Data
SW1 / SW2 – Position 4
Pin Signal
1 GROUND/SHIELD
2 RS422 OUT -
3 RS422 OUT +
4 NO CONNECTION
5 RS422 IN -
6 RS422 IN +
7 NO CONNECTION
8 GROUND
Table 10. J2/J3 Connections for Manchester/Biphase
Termination Unit Data
SW1 / SW2 – Position 5
Pin Signal
1 MANCHESTER/BIPHASE OUT -
2 MANCHESTER/BIPHASE OUT +
3 NO CONNECTION
4 NO CONNECTION
5 MANCHESTER/BIPHASE IN -
6 MANCHESTER/BIPHASE IN +
7 TERMINIATION - TIE TO PIN 5
8 GROUND
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Manual title Table of Contents
Table 11. J2/J3 Connections for RS485 2-Wire Data
SW1 / SW2 – Position 6 (standard offset)
Position 7 (1V offset)
Position 8 (2V offset)
Pin Signal
1 GROUND/SHIELD
2 NO CONNECTION
3 NO CONNECTION
4 +5 VDC BIAS OUT
5 RS485 -
6 RS485 +
7 TERMINATION – TIE TO PIN 5
8 GROUND
Table 13. J2/J3 Connections for SensorNet Data
SW1 / SW2 – Position 6
Table 12. J2/J3 Connections for RS485 4-Wire Data
SW1 / SW2 – Position 9 (standard offset)
Position A (1V offset)
Position B (2V offset)
Pin Signal
1 GROUND/SHIELD
2 RS485 OUT -
3 RS485 OUT +
4 +5 VDC BIAS OUT
5 RS485 IN -
6 RS485 IN +
7 TERMINATION – TIE TO PIN 5
8 GROUND
Table 14. J2/J3 Connections for Test Mode Loopback
SW1 / SW2 – Position F
Pin Signal
1 GROUND/SHIELD
2 NO CONNECTION
3 NO CONNECTION
4 +5 VDC BIAS OUT
5 SENSORNET -
6 SENSORNET +
7 TERMINATION – TIE TO PIN 5
8 GROUND
Pin Signal
1 NO CONNECTION
2 TIE TO PIN 5
3 TIE TO PIN 6
4 NO CONNECTION
5 TIE TO PIN 2
6 TIE TO PIN 3
7 NO CONNECTION
8 GROUND
3.3.3 BUILT-IN TERMINATION
The S768DAV features a built-in termination on the Interface Board for RS485, Manchester, Biphase, and
SensorNet installations. Refer to Table 4, and Table 10 through Table 13.
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Installation S768DAV – S7768DAV User Manual
3.3.4 VIDEO CABLE CONNECTIONS
CAUTION:
Make sure all peripheral equipment that will be connected to the fiber unit is turned OFF during
installation. Damage to equipment may result.
NOTE: Belden number 9259 or equivalent RG59/U coaxial cable should be used between the video equipment and the fiber units.
Do not exceed the maximum distance recommended by the manufacturer of the video equipment.
Coaxial cable must be terminated with female BNC connectors to properly connect with the fiber links.
NOTE:
Connect the video equipment, such as a camera and monitor, to the input and output BNC jacks on the
S768DAV transmitter and receiver using terminated coaxial cable. See Figure 10.
3.3.5
AUDIO CONNECTIONS
Audio input and output signals are connected to the 26-pin connector located on the back of the module,
or to the screw terminal connectors on the Interface board supplied with the unit. See Figure 10 and
Figure 11. Refer to Table 3 and Table 4 for wiring information.
NOTE: Signal strength remains the same regardless of type of connection.
Audio connection options include:
! Balanced transmitter input to balanced receiver output
! Balanced transmitter input to unbalanced receiver output
! Unbalanced transmitter input to unbalanced receiver output
! Unbalanced transmitter input to balanced receiver output
1) For a balanced connection, connect the external equipment to the (+) and (-) pins of the desired
channel.
2) For an unbalanced connection, add a short jumper between the (-) pin and the ground pin.
3.3.6
FIBER OPTIC CABLE CONNECTIONS
Most cable manufacturers identify the individual fibers in the cable. Select appropriately terminated fiber
and mark both ends with a unique identification label (e.g. for cable no. 03, fiber no. 08) to ensure that the
fiber connected to the near end is the same as the one connected to the far end.
The proper optical connection will link the transmitter's TRANSMIT (OUT) port to the receiver's RECEIVE
(IN) port. See Figure 10.
1) Wipe the inside of the port’s sleeve with a lint-free pipe cleaner moistened with reagent-grade
isopropyl alcohol. Blow dry with dry air.
2) Clean the connector using a lint-free cloth dampened with reagent-grade isopropyl alcohol.
Thoroughly wipe the side and end of the ferrule. Blow the ferrule dry with dry air. Visually inspect
the ferrule for lint.
3) Fasten the fiber optic cable to the port.
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3.3.7 STANDALONE MODULE POWER CONNECTIONS
CAUTION:
Standalone modules can be powered only by 13.5 - 16 VDC. AC power must not be used. Damage to
the equipment will result.
The 502R rack card enclosure has a removable screw terminal connector for the electrical input
connection. Pin 1 of this connector is the GROUND terminal, pin 2 is not used, and pin 3 is the +DC
terminal as marked on the enclosure. Connect the input power as follows.
1) Identify the power connector and remove it from the module.
2) Make sure the power supply is not connected to any power source, and strip approximately 0.25
inches (6 mm) of insulation from the ends of the cable.
3) Taking care to observe the correct polarization of the cable, insert one lead into one of the screw
sockets and tighten the screw. Confirm the security of the connection with a light pull on the cable.
4) Repeat step 3 for the other conductor.
5) Seat the connector in its position in the fiber unit.
6) Plug the power supply into a suitable outlet.
7) Power up the peripheral equipment and verify system operation by observing video on the monitor
at the receiver end.
3.3.8
RACK MODULE POWER CONNECTIONS
Power connections are made automatically when the card is installed. To supply power to the rack,
connect the rack power supply to an AC outlet and set the power switch to ON.
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Operation S768DAV – S7768DAV User Manual
4 OPERATION
4.1 NORMAL OPERATION
S768DAV fiber links operate automatically after installation. Refer to paragraph 4.4 for details on how to
execute the test mode. For description of LED color codes and an explanation of how to diagnose system
faults using the LEDs built into the units, refer to section 5, Troubleshooting.
4.2 LED OPERATION
The S768DAV modules have built-in Status Monitoring And Reliability Test System (SMARTS)
diagnostic capabilities that include LED indicators for monitoring data and optical status. The S768DAV
fiber units have nine pairs of LED indicators that describe the current state of operation; the current status
of video, audio, and data signals; and fiber optic signal strength.
These indicator pairs are LASER and LEVEL/LOSS, VIDEO IN/OUT, AUDIO 1 IN/OUT, AUDIO 2
IN/OUT, DATA 1 IN/OUT, DATA 2 IN/OUT, CONTACT 1 IN/OUT, CONTACT 2 IN/OUT, ENABLED 1,
and ENABLED 2. See Figure 12. The operation of the front panel LEDs is described in the following
paragraphs.
Figure 12. Front Panel LEDs
4.2.1 LASER INDICATOR
A green LASER LED indicates the laser is operating normally. A red LASER LED indicates the laser is
malfunctioning.
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S768DAV – S7768DAV User Manual Operation
4.2.2 LEVEL/LOSS INDICATOR
This LED indicates the relative optical signal strength received at the module. When sufficient optical
power is being received, the LED is green. As the optical power decreases, as happens through long fiber
runs, splices or connections, the LEVEL/LOSS LED stays green until the optical power drops below the
minimum level.
The LEVEL/LOSS LED will turn bright red to indicate an insufficient amount of optical power is being
received. All data will default to its failure state level to eliminate bus contention.
4.2.3
VIDEO IN/OUT INDICATORS
The VIDEO IN (or OUT) LED indicates the strength of the video signal. The VIDEO IN LED on the module
remains green as long as an adequate video signal is being input to the unit. If the video input becomes
too weak, the LED will turn red. The VIDEO OUT LED on the module performs a similar function, except
that it refers to the video output from the unit.
Note: The S768DAV monitors the video sync signals to determine the strength of the signal. It does not monitor the brightness
signal. Thus, if the scene in front of a camera is totally dark, producing a blank monitor screen, the VIDEO IN and OUT LEDs can
still be green.
4.2.4 AUDIO 1, 2 IN/OUT INDICATORS
The AUDIO IN (or OUT) LED indicates the strength of the audio signal by varying in intensity. The AUDIO
IN LED remains green as long as an adequate audio signal level is being input to the module.
If the audio input becomes too weak, the LED will turn off. The LED will be red when the audio level is
clipped.
The AUDIO OUT LED performs a similar function, except that it refers to the audio output from the
module.
4.2.5
DATA 1, 2 IN/OUT INDICATORS
The DATA IN LED indicates the level of the data signal being input to the S768DAV over copper. A green
DATA IN LED indicates a logic HIGH is present on the data inputs.
An amber DATA IN LED indicates a logic LOW is present on the copper. No color (OFF) indicates a tristate or high impedance input.
This LED can be used to determine the resting state of your equipment and, in the RS485 states, verify
that a tri-state is being detected properly.
The S768DAV has special circuitry to capture data transitions and make them visible on the LEDs. Highspeed bursts of activity, previously undetectable by standard LED circuits, are easily seen by this special
circuitry.
The DATA OUT LED functions identically to the DATA IN LED except that the LED represents data that is
being output from the unit. This LED has the same high-speed capture circuitry as the DATA IN LED.
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Operation S768DAV – S7768DAV User Manual
4.2.6 CONTACT 1, 2 IN/OUT INDICATORS
The CONTACT IN/OUT LEDs indicate the presence of relay/contact closure signals. A green CONTACT
IN/OUT LED indicates a closed relay contact, and a red LED indicates an open relay contact.
4.2.7
ENABLED 1, 2 INDICATORS
The ENABLED 1 (left) and ENABLED 2 (right) LEDs monitor the selected mode of Data channels 1 and
2. They have five states as follows:
! Green indicates a valid mode has been selected.
! Red indicates an invalid mode (spare or TEST mode) has been selected.
! Flashing red/green indicates that no mode has been selected.
! Flashing green/off indicates a valid mode is configured remotely.
! Flashing red/off indicates either an invalid mode or the Test mode is configured remotely.
4.3 VIDEO TEST PATTERNS
The S768DAV includes an internal video test pattern generator that can ease installation and
troubleshooting. The test patterns generated can notify the user of a fiber or video source failure by
outputting specific test patterns on the user’s monitor. This mode verifies proper functionality of the digital
decoding process and the fiber-optic interconnections.
Follow the procedures described in paragraph 2.5 to enable the test pattern generator. Figure 13 shows
the test patterns displayed on the monitor.
Disabling the test pattern generator causes no on-screen display during failure conditions.
Single White Bar Double White Bar Ramp Test Pattern
No Video Input No Optical Input Test Mode Selected
to Transmitter to Receiver at Transmitter
Figure 13. On-Screen Monitor Displays
4.4 TEST MODE
The Test mode enables you to verify the operation of the video, audio, and data circuits in the S768DAV
units, as well as the fiber connection from the S768DAV transmitter to the S768DAV receiver. To execute
the test mode, perform the following.
Note: Either DATA SELECT switch (SW-1 or SW-2) can be set to position F to enable the video ramp test pattern and the 1 kHz
test tone generator to verify video and audio operation.
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S768DAV – S7768DAV User Manual Operation
1) Set the DATA SELECT switch on the S768DAV you are testing to F (TX Test Mode). At this end
only, wire the data connections as follows (refer to Table 14):
• Connect the DATA IN+ pin to the DATA OUT+ pin.
• Connect the DATA IN- pin to the DATA OUT- pin.
2) At the opposite end, set the DATA SELECT switch on the S768DAV to E (RX Test Mode).
3) The transmitting unit should operate as follows:
• ENABLED LED is RED, indicating that a valid data format has not been selected.
• DATA OUT LED is slowly flashing between amber, green, and off. This indicates that the test
mode is generating an output pattern and sending it out on copper.
• DATA IN LED should mimic the DATA OUT LED. This indicates a good, proper loopback
connection, and proves that the data transmit/receive circuitry is working properly.
• LEVEL/LOSSTM might be red or green indicating received fiber signal strength.
4) The receiving unit should operate as follows:
• ENABLED LED is GREEN indicating a valid data format is selected.
• DATA OUT LED should slowly flash amber, green, off. This indicates that the fiber path from the
unit set for Test mode is reliable.
• DATA IN LED should be OFF indicating there is no input copper connection made.
• LEVEL/LOSS LED should be green to off (but not red), indicating that sufficient optical power is
being received.
• The AUDIO OUT LEDs should be green indicating sufficient audio output signal level.
5) In addition to the LED operation described above, verify the following:
• The monitor displays a ramp test pattern as shown in Figure 13.
• A 1 kHz test tone is emitted on the audio system connected to the receiving unit.
After the test has been performed at one end, swap switch positions and connectors to perform the test
on the other end. If the test is successful, the copper-in-to-fiber-to-copper-out conversion is working in
both directions.
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Troubleshooting S768DAV – S7768DAV User Manual
5 TROUBLESHOOTING
Table 15 contains troubleshooting information for the S768DAV units.
Table 15. Troubleshooting
Problem Probable Cause Solution
Red LASER LED Laser is malfunctioning Replace module
Fiber not connected Connect fiber to receiver and transmitter Red LEVEL/LOSS LED
Transmitter/Receiver not powered up Connect and apply power to module
VIDEO IN/OUT LED is OFF
AUDIO IN/OUT LED is OFF
DATA IN LED is OFF
Video input not connected to module Connect video input to module
Video source not powered up Apply power to video source
Video source not transmitting Check video source and cabling
Audio input not connected to module Connect audio input to module
Audio source not powered up Apply power to audio source
Audio source not transmitting Check audio source and cabling
Tri-state condition No action required
Data input not connected to module Connect data input to module
Data source not powered up Apply power to data source
Data source not transmitting Check data source and cabling
Red ENABLED 1 and/or 2 LED Test or invalid mode selected Set DATA SELECT switch to valid format
ENABLED 1 and/or 2 LED
flashing red/green
ENABLED 1 and/or 2 LED
flashing red/off
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Both Transmitter and Receiver set to
Auto Configure mode
Invalid or Test mode configured
remotely
Set Transmitter or Receiver DATA
SELECT switch to valid format
Set DATA SELECT switch to valid format
if not in Test mode
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S768DAV – S7768DAV User Manual RS485 Application Notes
APPENDIX A: RS485 APPLICATION NOTES
A.1 INTRODUCTION
The S768DAV is configurable for both full-duplex (four-wire) and half-duplex (two-wire) operation. It can
be used for interfacing to systems adhering strictly to the RS-485 specification and for use with systems
that use a modified, "fail-safe biased" RS-485 bus.
A.2 CONNECTION
Use high-quality twisted-pair wiring, and make sure all connection points are clean and tight. A loose
connection on one of the wires can appear to function, yet cause intermittent errors: DATA LEDs may be
flashing as signals pass through the system, but those signals will be corrupt.
A.3 CONFIGURATION
The S768DAV multi-protocol data (MPD) units are designed to work with virtually any RS485 system.
Unfortunately, some systems operate on a "modified" version of RS485 that use a fail-safe biasing to pull
up/down their bus during a tri-state condition. In a standard RS485 system, when a driver on a properly
terminated bus goes into tri-state, the voltage between the differential outputs should be less than
200 mv.
(This is considered "standard offset" in the product instruction manuals.) A differential output tri-state
voltage this small can cause some non-standard systems to latch up, because they are designed for
much larger, "fail-safe," offsets.
To be able to interface to such equipment, the S768DAV MPD units offer two more "offset" level modes.
In most cases, the S768DAV unit should be configured for "standard offset" operation.
When the system is operating properly, the DATA IN and DATA OUT LEDs are off when there is no
communication (tri-state) and flash when data is being sent or received. If the link is not functioning
properly (LEDs will most likely not turn off), change the DATA SELECT switch on the unit to a higher
offset mode.
First try 1 V, then 2 V. If switching the mode switch does not prove effective, the offset level may have to
be emulated at one end of the system by using pull-up/down resistors on the data connector. The
S768DAV has a +5 V bias pin and ground pins on the connector for this purpose. Contact the equipment
manufacturer's technical support for recommended resistor values and configuration.
A.4 TERMINATION
RS485 systems need to be properly terminated in order to work reliably. Two terminating resistors are
used on each RS485 bus, at the farthest ends of the link.
These resistors should be attached to the data/audio connector on the back of the unit if the S768DAV
link is at one end of the bus. If the terminating resistors are left out, the tri-state condition will not be
detected, and the bus might lock up. If there are too many terminations on the bus, signal levels might
drop too low, or driver circuitry might fail. The standard value of terminating resistors for RS485 is 120Ω.
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RS485 Application Notes S768DAV – S7768DAV User Manual
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