Technical data

Chapter 3: Overview
SP40S Multi-Function Facility Communication System Manual, Revision L
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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.
3.5.2 Overview
This section describes the behavior differences of digital voice messages between SP40S firmware and
SP40S-D firmware. The SP40S-D firmware changes are limited to the user interface section of the SP40S
panel (refer to Figure 1). All other behaviors of the SP40S, such as strobe activation, message
prioritization, and AUX input functionality have not changed.
3.5.2.1 Operation of Digital Voice Messages with SP40S firmware
Digital voice (DV) messages on the SP40S are activated locally via the front panel interface pushbuttons
(PB) or remotely using contact closures (CC) with the SP40S firmware. An activated DV message will
remain active indefinitely until you clear the source of activation. Activation of a particular DV message
appears locally at the front panel interface by LEDs located on each DV message PB. For the SP40S
firmware, a flashing LED indicates that the PB activated a message, and a solid LED indicates that a CC
activated a message.
3.5.2.3 Operation of the Digital Voice Messages with the SP40S-D firmware
Each PB and CC for DV messages 1 through 6 are individual inputs each having their own 10-minute
timer. If one of the inputs goes active its associated timer starts, the associated message starts playing,
and if the input does not restore, the input’s timer will time out and the message will stop playing. The
input must restore before it can go active again, triggering the message to play.
Example 1: CC1 goes active, its timer starts and message1 starts playing. If CC1 does not restore, the
timer will expire and the message will stop playing in 10 minutes. Once CC1 times out, CC1 cannot
trigger message1 to play again until CC1 restores. You can, however, press PB1 and message1 will start
playing again and will continue for 10 minutes if PB1 remains active. If PB1’s timer is allowed to time
out also, message one cannot be triggered by anything now since both of its associated inputs are still in
“Timeout” mode. One or both must restore and re-activate for message1 to start playing again.
Example 2: CC1 goes active, its timer starts and message1 starts playing. 8 minutes into the timer PB1
goes active which start PB1’s timer and message1 continues to play for another 10 minutes. This makes
the total play time 18 minutes in this example if neither CC1 nor PB1 restores and re-activates. It is
possible that lower priority messages may not be heard at all because of a higher priority message’s inputs
being restored and re-activated while the lower priority input times out.
DV message 7 and 8’s inputs (PB & CC) do not have a timer associated with them and will continue to
play message 7 or 8 until the input restores or a higher priority input goes active.