Sierra Wireless AirLink ES Series Hardware User's Manual page 34

AirLink ES Series Hardware User Guide
34
It has a maximum rating of 30 V and 50 mA sink current. The pin is user
programmed. For information on configuring Pin 4 (Digital Input/Relay Output 1 in
ACEmanager) refer to the ALEOS Software Configuration User Guide.
One way to use pin 4 is with events reporting. In ACEmanager you:
1. Create an Event.
This triggers the device to act when it sees a specific input. For example, you
can tell the device to do something when the Pin 4 state (Digital Input/Relay
Output 1 in ACEmanager) changes. This could be when a door is opened,
activating a switch attached to it.
2. Specify an Action.
These are instructions the device performs when it sees an event. For exam-
ple, an email could be sent to security, saying the door is open, giving the
time, location and other information.
3. Link the event to the action.
For more information on configuring event reporting, refer to the ALEOS Software
Configuration User Guide.
There are several typical uses for Pin 4:
• As a digital input, it monitors a switch, using its opening or closing to record
events or monitoring external voltages of up to 30 VDC. For example, you
could use it to measure the voltage on a 24 VDC light bulb and have the
device react when it turns
When the switch, or input voltage is:
· Open (2.2 VDC to 30 VDC) – It is read as a digital input=1
· Closed (0 to 1.2 VDC) – It is read as a digital input=0
AirLink ES device
I/O Circuit
Examples: Door opening/closing, valve opening/closing, ignition on/off, tow bar up/down,
empty/full container.
Figure 3-4: Digital Input Operation
• As a digital output, it can trigger an alarm, a siren, or a door lock, or open a
valve or switch. Pin 4 is an open collector transistor output normally at
3.3 VDC. When triggered, it is pulled to low.
on.
3.3 V
51 k
internal
pull up
Contact closed
Digital 0
0 VDC to 1.2 VDC
Contact
Contact open
Digital 1
3.3 VDC to 30 VDC
Ground
4116746