CalAmp Fusion LTE User Manual - page 65
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3.10.6
I/O CONTROL
Relay Output Select
Select the initial state of the relays i.e. the state when the system boots up. Note that the “Active” state is delayed from
power-up up to when the firmware has completed its boot process – this is approximately 30-40 seconds.
Digital I/O Select
The Digital I/O is configurable as input or output signals. The following picture presents a simplified model of the circuitry:
When in Output Mode, the Output State signal serves to control the Open Collector transistor output. When in Input Mode
the Input Sense signal is fed into the Fusion and reported.