Audio International, Inc. MSM2921-0x-x Installation
Document #540186, Rev. IR, 2/2000
Page 5 of 11
2.0 Application
2.1 Introduction
The MSM2921-0x is utilized in applications where momentary switch
contacts are required to interface with AI’s proprietary RS485 serial data
bus devices. The unit will allow for up to twelve (12) independent discrete
switch inputs and up to twelve (12) discrete status outputs for
communication on the data bus.
The strapping options allow the unit to address internal firmware to allow
the operator and/or installation agency to use multiple MSM2921-0x-x
controlled units on the same AI proprietary RS485 data bus.
2.2 Block
Diagram
– Typical Application
3.0
Installation
3.1
Prior to Installation
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
