Sierra Wireless FX30S User Guide
Rev 2 Mar.18
28
41110485
High Side Pull-up / Dry Contact Switch Input
The three external I/O pins on the FX30 power connector have a high side pull-up
available. This high side pull-up can be driven low using a dry contact switch or
NPN/PNP transistor.
To use I/O3 as a high side pull-up/switch input, GPIO56 (that drives I/O3 when
used as a digital output) must be low.
Note: For this use case, the pull-up must be enabled.
Figure 2-20: High Side Pull-up / Dry Contact Switch Input
Figure 2-21: High Side Pull-up / Sensor and Transistor Input
Analog Input
Analog input is available on I/O2 on the power connector and on the IoT interface.
You can connect any of these pins to an analog gauge. As an analog input
(voltage sensing pin), the gateway monitors voltage changes in small increments.
This allows you to monitor equipment that reports status as an analog voltage.
The pin detects inputs of 0V–10 V (or 0V–5 V when the lower ADC range is
selected). When used with a sensor to transform values into voltages, the pin can
monitor measurements like temperatures, pressures or the volume of liquid in a
container.
Note: The option to select the ADC voltage range has not been implemented in the current
release.
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