9711-0701A
2/3/2000
Alpha Discrete Input Interface Operating Instructions
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