MV-32/64 Multiviewer www.snellgroup.com Operation
Issue 1 Rev 11 Page 80 © 2014 Snell Limited
Example 2:
Trigger the timer by a GPI and allow it to be paused and resumed by using individual GPIs.
Initially it is to countdown from 00:00:30.
• First, three GPIs have to be assigned as timer triggers; one trigger to Reset
(Start) the timer, one to Pause it and one to Resume the timer. Timer Triggers are
set in the Module Menu | Setup Module | GPIs tab | GPI Inputs sub-tab.
For each Global GPI In that is to be used click on the drop-down list and select
the Timer Trigger to be assigned to it, in this example Timer Trigger 1, 2 and 3
will be assigned to the three physical GPIs.
• Open the Object Properties of the Timer tile, and in the Properties tab:
Select Control with GPIs
Tick Countdown first
Tick Enable Pause and Resume GPIs using:
Select Two GPIs
Set Reset GPI to use Timer Trigger 1
Set Pause/Resume GPI to use Timer Trigger 2
Set Resume GPIs to use Timer Trigger 3
Set the Reset to time to 00:00:30.
• When the reset (or resume) GPI is operated the timer will start counting down
from 00:00:30, and be colored white.
• When it reaches 00:00:10 it will change to orange. 10 seconds later it will reach
00:00:00, change to red, and start counting up.
• The timer continues to count up indefinitely, wrapping back to 00:00:00 after 24
hours.
• The pause and resume GPIs can be operated at anytime in the countdown or
subsequent count up to pause and resume the count.
• If the reset GPI is operated while the timer is running the timer will be reset back
to 00:00:30 and start counting down.
If the reset GPI is operated while the timer is paused it will reset to 00:00:30 and
remain there until the resume GPI is operated.
There are 10 timer trigger items available here - if multiple timers require triggering from
different GPIs then up to 10 can be set up.
The GPI triggering of the timer is only sensitive to positive edges. In other words, a
transition from 0V to 3V or greater on the relevant GPI pin will trigger the timer. It does not
have to be held above this threshold indefinitely to remain counting. It must remain
asserted for at least 200ms though to trigger the timer. Any further transitions from 0V to
3V or above will re-trigger it.
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