Sierra Wireless AceView User's Guide download pdf (Page 41)

Rev 2.0 Feb.12 41

5: Inputs, Relay Outputs, and Power Status

• Capturing External

Events

• Power Modes and

Information

The AirLink GX400 can be configured to monitor the input, respond

to specific types of events, and trigger digital output. The device can

also be configured to change its power mode in order to conserve

power. These features can be configured to your needs.

Capturing External Events

The AirLink GX400 is equipped with an I/O port interface which

includes one low power timer enable input and one digital I/O. These

may be connected to sensors and switches to monitor status and

remotely control equipment.

AirLink GX400 board supports a low power timer enable input pin

and a digital I/O pin which are connected to the CPU processor. The

I/O signal comes in from the power connector, through a PolySwitch

resettable fuse, and ties into the CPU pins with protection circuitry.

Digital Input

Digital Input can be used in two different modes: the switch mode or

the voltage sensing mode.

Figure 5-1: Digital Input Contact Closure

The switch mode senses contact closures. The digital input can

report either an open or closed state, and can be wired to a ground

signal via a switch. When the switch is open, the input reads “3.3V”.

When the switch is closed, the input reads “OV”.

Digital I/O

Ground

Contact

Digital Input

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Sierra Wireless AceView User's Guide Page 41