Sierra Wireless FX30S - Page 28

Sierra Wireless FX30S User Guide
Rev. 7 August 2021 28 41110485
High Side Pull-up / Dry Contact Switch Input
The three external I/O pins on the FX30S 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/O 3 as a high side pull-up/switch input, GPIO56 (that drives I/O 3 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
Two analog inputs are available on the FX30S. External I/O 2 on the power connector
maps to ADC1 on the WP module.
For more information, see Table D-1, FX30S Hardware
Feature to Linux Interface Mapping
on page 78 .
The IoT interface analog pin maps to ADC0 on the WP module. For more information, see
Table 3-15, IoT Connector Interface on page 58.
You can connect either 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 0 V–10 V. 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.
Gateway
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