This 24-page document provides setup and operation instructions
for the three modules that make up the Alpha Discrete Input Interface.
The Alpha Discrete Input Interface allows messages to be
displayed on standard Alpha electronic signs by using simple
on/off contacts to trigger messages that have been stored in a sign.
The Alpha Discrete Input Interface consists of three types
of modules which can be connected in any order:
CPU
Module -- serves as an interface between the Input Modules and
Alpha signs
Input
Module (up to four can be used, depending on the Operating Mode
used) -- the eight, dry contact inputs of each Input Module
can be configured to one of five possible Operating Modes:
Mode 0: Discrete Fixed
Mode 1: Momentary Triggered
Mode 2: Binary Coded Decimal (BCD)
Mode 3: Binary
Mode 4: Counter
Power
Module -- supplies power to the CPU Module and Input Module
