User guide

AirLink GX440 for Verizon LTE User Guide
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Examples of using the input with a switch to ground:
• 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.
Digital Output
Digital Output of open collector design is capable of driving an external device
such as a pull-up resistor or relay. (For example, a relay could be connected
between the output pin and an external voltage.) The voltage on the relay cannot
exceed 30V. The digital output pin can handle up to 150mA.
Examples of using the digital output with an external relay or pull-up resistor:
• 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. Inputs,
• Turning a light on or off.
• Opening the vehicle's trunk or doors.
Figure 5-2: Digital Output Example Relay Drive Circuit