Protech 697B User Manual
PROTECH
MODELS COVERED
697B
®
1/02
INTEGRA III SYSTEM
INSTALLATION & OPERATION MANUAL
PRIORITY SWITCHING CARD
Model 697B Shown
www.protechaudio.com
The Model 697B Priority Switcher card is designed for use
in professional audio applications. The card has 5 inputs, and
a single output. Each input may be turned on, via an external
ground closure, until an input with a higher priority number
comes on. At that point the input with a lower priority level
will be shut off until the higher level priority channel releases
control. Then the lower priority channel will again be turned
on. There are 5 levels of priority on each card. The cards may
be linked together to create additional levels of priority.
The application of the card is found in public address
systems, emergency communication systems, or training
systems. The actual application of the priority switcher is
found in buildings such as airports, factories, office buildings, mass transit systems, operator training systems. and
convention centers.
Each input, and the output, are double-pole. This allows the
priority switcher to handle balanced lines. All five sets of
closures are solid-state CMOS switches. When activated, the
switch closure set goes to a low-on resistance. This action
allows the unit to switch even microphone level signals,
without introducing objectionable pops and clicks. When
deactivated, or over-ridden by a higher priority level closure,
the CMOS switch goes to a high resistance state.
In addition to the five sets of solid-state closures, the Model
697B has a built-in double-pole, double-throw relay, capable
of switching loads up to 5 amps. The relay may be used to
control by-pass relays mounted in various remote speaker
attenuators. When used in this manner, the relay will automatically switch the remote relays over to a "Full Volume"
setting, for emergency announcements. This relay circuit is
controlled by strapping the relay ground leg (via on-board
push-on jumpers) to the control port for each solid-state
closure set. This arrangement allows the user to strap the relay
to any or all CMOS ground closures, to create the volume
override condition.
The Model 697B Priority Switcher card is linkable. By
strapping two cards together, the user can effectively create 10
levels of priority. Switch #1 on card #1 would have the highest
level of priority. Switch #5 on card #2 would have the lowest
level. Cards may be linked in any number within a card frame
to create additional levels of priority.
The Model 697B Priority Switcher card may used in
conjunction with Model 590 Programmable Switcher card to
create switching systems incorporating features such as lockout, last-on, and all-call.
The Model 697B has been designed to provide the user with
years of reliable, uninterrupted service.
Protech Audio Corporation, PO Box 597, 192 Cedar River Road, Indian Lake, New York, 12842, Voice 518-648-6410 Fax 518-648-6395
INSTALLATION
The Model 697BB Priority Switching Card is designed to
be mounted in either the Model 857B or 858B Card Frame
Package.
Model 857B - is designed for use with 10 audio cards and
external power supply (Model 66708).
Model 858B - is designed for use with 9 audio cards, and one
plug-in power supply card (Provided).
The determination as to which backplane assembly to use
in your project, was made prior to our factory receiving the
order. The backplane assembly you have received will
accommodate the group of cards you or your designer have
specified.
The actual steps necessary for installation of the 697B Priority
switching card, are comparable to those necessary for any of
the INTEGRA III SYSTEM cards. They are as follows:
1- Mount the card frame in an appropriate EIA 19" width rack,
using 4 screws of sufficient tensile strength to provide secure
mounting.
4- Unpack each individual card, inspect for shipping
damage, and assuming none is found, slide the card
half-way into the appropriate slot. After all cards have been
installed half-way into the card frame, plug in one card at a time
and turn on the power supply. Make sure no unusual loading is
noticed at the power supply. If loading is no ticed, turn off the
power supply, unplug the card and recheck terminations. If no
loading is noticed, continue inserting each card in the card
frame, checking power supply loading as each card is plugged
in. When all the cards have been plugged in, the installation is
complete, and all that remains is the alignment.
ALIGNMENT
The Model 697 does not require alignment. Operation of the
unit may be checked in the following manner.
1- Apply a signal representative of the actual signal level to
be used, to contacts 1 HI & 1 LO inputs.
2- While monitoring the output, ground switch #1. Check
for proper signal level at the output pins.
3- Repeat steps 2 & 3 for each switch channel on the
Model 697.
This completes the installation and alignment of your Model
697 Priority switching Card. The card(s) may be expected to
deliver years of uninterrupted service.
PROTECH
To Lower
Priority Level
cards.
From Higher
Priority Level
Cards.
Link Out
K1B N/O
K1B N/C
K1B Arm
Input 4 HI
Input 4 LO
Switvh 4
Input 2 HI
Input 2 LO
Switch 2
Input 3 HI
Input 3 LO
Switch 3
Link In
®
INTEGRA III SYSTEM
CONNECTOR DRAWING
857B & 858B Backplane Connections
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
MODEL 697B
Output LO
Output HI
GROUND
K1A N/O
K1A N/C
K1A Arm
Input 1 HI
GROUND
Input 1 LO
SWITCH 1
Input 5 HI
Input 5 LO
GROUND
SWITCH 5
2- A determination has been made as to which type of power
supply will be used on your system. Follow the instructions for
the type of power supply you will be installing.
EXTERNAL POWER SUPPLY. If an external power supply
is to be used, terminate the proper supply connections
to pins 1, 2, & 3 of the DC connector, as shown in the card frame
layout drawing Turn on the power supply, and using a DC
voltmeter, check for correct voltage and polarity at pins 1, 2, &
3 of of the DC cpnnector.
INTERNAL POWER SUPPLY. If a plug-in power supply card
is to be used, plug in the supply card, and check for proper
illumination of both plus and minus DC green LED's.
3- Terminate all audio input and output connections, using the
card connection drawing on the facing page. Shielded cable is
recommended for all audio connections.
INPUT #1 IS HIGHEST LEVEL PRIORITY
NOTES:
Note 1The alignment procedures for INTEGRA III SYSTEM cards,
differ from card type to card type. Therefore it is necessary
to consult the alignment procedure for each type of card being
installed, to properly align a card frame using different card
types.
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