User guide

PinPoint X 1x/EV-DO
42 20070914
Digital Inputs
Figure 6-2: Digital Input Contact Closure
By measuring contact closures on switches, the digital inputs can report a simple
open or closed state. Each of the four digital inputs can be wired to the two
ground signals via a switch. When the switch is open, the input will read “OPEN”.
When the switch is closed and the input is connected to ground, the input will
read “CLOSED”.
• When a door or other latch is opened or closed.
• Counting pulses or other electronic events.
• When a gauge reaches a certain point.
• When a container fills or empties.
• When a switch or valve is opened or closed.
• When the tow bar is raised or lowered.
• Connected to a sensor, the level of fuel in a vehicle.
• When the trunk of a vehicle is opened or closed.
• When the ignition is turned on or off.
Relay Outputs
As an electronic switch which can be opened or closed (Normally Open relay), a
relay can be used to transmit an action to another device by signalling to that
other device an “on” or “off”. As a Normally Open relay, the circuit of the relay is
disconnected (open) unless it is active. When the relay is active, the circuit is
connected (closed).
• Setting off an alarm or siren.
• Triggering a process to start on another device.
• Opening or closing a valve or switch.
• Locking or unlocking a door.
• Turning a light on or off.
• Opening the vehicle’s trunk or doors.