Sierra Wireless AirLink LX40 Hardware User's Manual page 25

You can use the I/O pin in conjunction with events reporting to configure the LX40 to send
a report when the state of the monitored router changes, for example when a switch is
opened or closed. For more information, refer to the ALEOS Software Configuration User
Guide (Events Reporting chapter).
Pulse Counter
You can use the green wire to connect Pin 4 to a pulse counter. The digital pulse counter
is not available in Standby mode.
Figure 2-12: Digital Input / Pulse Counter
Maximum frequency: 140 Hz
Duty cycle: 20%–80%
Note: Values may vary, depending on signal noise.
Table 2-3: Pulse Counter
Pull-up
Off
Rev. 2 January 2021
Pin 4 (power connector)
Digital Pulse
Generator
V
Low
V
High
State Minimum
Low —
High 2.7 V
LX40
V
in
Protection
Circuitry
* Configurable on the ACEmanager I/O tab
Typical Maximum
— 1.0 V
— V
in
25
Installation and Startup
Internal pull-up
resistor
Off (default)*
Z
in
41112510