Technical data

Chapter 3: Overview

3.5.1 Basic Operation of User Interface

When a Message button is pressed, the user interface microcontroller processes the signal and outputs it to the

Digital Voice microcontroller which plays the corresponding message. The user interface illuminates the

corresponding message LED when a button is pressed or a message activation contact closure is received. The LED

blinks if the activation was a button press and the LED remains ON constantly when a contact closure is present. If

a button is pressed, the message LED remains blinking and the message remains active until the button is pressed

again.

SP40S Multi-Function Facility Communication System Manual, Revision D