Shure AMS880 Datasheet

2 2 2 HARTREY AVE., EVANSTON, IL, 60204
u
S.A
DATA SHEET
AREA CODE 3 1 21866-2200 CABLE: SHUREMICRO
TWX. 91 0-231 -0048 TELEX: 72-4381
MODEL A M S 8 8 0
PONENTS
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VIDEO SWITCHER INTERFACE
The Shure Model AMS880 is a Video Switcher Interface
which expands the Shure Automatic Microphone System
[AMS] for use in video teleconferencing applications. The
heart of the AMS880 is an 8 7 4 8 microcomputer which ac-
tuates the remote-control input of a commercially available
video switcher in response t o the action of an automatic
microphone mixer such as the Shure AMS4000 or
AMS8000. Video cameras covering individual microphones
are thereby activated when their microphones are ac-
tivated, causing the video presentation t o smoothly follow
the flow of the audio discourse. Three additional options are
also available. First, the AMS880 can select a particular
vidoo channel [such as a wide-angle camera] after a
predetermined period of audio inactivity. Second, the
AMS880 contains an "override" option that suspends
automatic action and permits external manual switch selec-
tion of a particular video channel, such as a graphics
camera. Third, a "disable" input is available t o suspend all
automatic action and allow manual camera selection via
switches externally connected in parallel to the AMS880
outputs.
The AMS880 is designed for mounting in a standard 1 9 "
equipment rack, or, using supplied feet, on any horizontal
surface. The unit is powered by an external power
transformer which is Listed by Underwriters Laboratories,
Inc.
SPECIFICATIONS
Inputs
Logic Gate Inputs: 8 plus logic ground
Open Circuit Voltage:
+
5V
Resistance: 1 kilohm
Logic Status: Low
=
channel gated on
lnput Protection: To 1 2V
Outputs [FET optically isolated; not connected to input
ground]
Off Resistance: Greater than 3 0 0 megohms
On Resistance: Less than 2 0 0 ohms
Switching Time: Less than 1 msec
Output Closure: Selected output will pulse closed for
2 5 0 msec; may [optionally] provide
maintained closure
Power
External power transformer: 1 2 0 Vac
+
l o % , 6 0 Hz,
6 W
Temperature Range
Operating: -7O to 57OC [20° to 135OFI
Storage: -1 8 " t o 7 1 O C
[0° t o 1 60°F]
Dimensions
4 4 . 5 m m H x 4 8 3 m m W x 1 2 7 m m D [ 1 3 h i n . x 1 9 i n . x
5 in.]
Weight
1 . I kilograms [ 2 . 5 Ib], including transformer
Supplied Accessories
Adhesive feet for surface mounting; screws and washers
for rack mounting; mating output connector [25-pin
DB25P type with separate solderable contacts, locking
screws and back shell with cable clamp]
INSTALLATION AND OPERATION
Controls, Indicators and Connectors
The front panel of the AMS880 contains a push-button
power-on switch and a green power-on indicator. The
rear panel contains a 1 . 2 m [4 ft] multiconductor ribbon
input cable which consists of eight channel Gate Out logic
inputs and a logic ground. Color coding of the ribbon cable
is shown in Table 1 .
TABLE 1 . INPUT CABLE CONNECTIONS
Color
Brown
Red
Orange
Yellow
Green
Function
Gate 1
Gate 2
Gate 3
Gate 4
Gate 5
Color Function
Gate
6
Purple Gate
7
Gate
8
White Ground
The rear panel also contains a connector for the external
power transformer, and a 25-socket subminiature D-type
output connector [ D B 2 5 S type] with locking screw studs
for connection t o the remote-control input of a video switch-
er such as the 3 M Video Bridging Switcher Model 1 0 1 . The
AMS880 is supplied with a matching 25-pin connector for
connection t o the video switcher cable. Pinlsocket connec-
tions for the 25-socket connector are given in Table 2.
TABLE 2. OUTPUT CONNECTOR TERMINALS
Output 3
Output 4
Output 5
9 N.C.
1 1 Output Cornrnol
Ground
Ground
N.C.
1 7 N.C.
N.C.
2 2 N.C.
The printed circuit board contains two eight-station DIP
switches which provide option selection as follows. Factory
preset positions are given in boldface type.
Copyright 1982, Shure Brothers
Inc
27A8044 [El]