Access 902 User Manual - System
5
980
987
902
Connecting the 902 or 903 to the Access
™
System
Control panels connect to the Access System via the Model 980 System Module (See Hookup Diagram below).
They also have terminals for the connection of an auxiliary ceiling-mounted Omnidirectional Infrared Re-
ceiver, which extends the range of the remote control’s operation.
Definitions of Special Terms
To best understand and use this powerful merchandising tool, it will be helpful to clarify a few terms used
throughout this manual.
COMPONENT
The merchandise or products connected to the switching system.
SWITCH MODULE
Small, intelligent, circuit board assembly that provides the actual switching for 4
to 8 components in the system. All components are connected to switch modules,
which in turn selectively interconnect products for demonstration. Your system
may contain several types of switch modules – Low-Level modules for sources or
amplifier inputs, High-Level modules for amplifier outputs, Speaker modules,
Video modules, and so forth. The quantities and types of modules contained in
your system depend on the number and types of components in your display.
SYSTEM BUS
A set of wires which interconnect all switch modules allowing control signals
(instructions) to flow between them. The system bus is color-coded, using red/
yellow/black/blue wires and operates as an RS-485 serial interface.
ADDRESS
Like your street address, a unique logical numeric code assigned to each module
to differentiate it from all others and enable reliable delivery of instructions via
the System Bus. Each module in the display can “talk” to and receive instructions
from the Control Panel, Product Select Buttons, the 905 IR Remote, a local PC, or a
PC via modem.
Product Group
A group of functionally similar components within the display, such as
or GROUP
CD players, amplifiers, front speakers, subwoofers, VCRs, etc. The 902 Control
Panel has provisions for 8 Product Groups and has capacity for 99 components in
each Product Group. The number of Product Groups can be expanded by adding
a 904 Product Group Expander. Each 904 Expander adds 8 more Product Groups
to the system, each capable of 99 components. You can add three 904s making the
Access System’s total capacity 16 electronic Product Groups and 16 speaker
Product Groups, each capable of handling 99 products, for a total of 3,168 prod-
ucts in a system.
Model 902 Hookup Diagram
Mic Input
(902 only)
Model 990 Ceiling
Mount Infrared
Receiver
To Amps/Receivers
Input to 987
EVC Audio
Level Module
(902 only)
Output of Source Bus
Auxilliary Infrared
Receiver Input
10-conductor Cable to
987 Module (902 only)
6-conductor Cable to
980 System Module