Vaisala Hydromet Data Collection Platform - Manual (Page 28)

User's Guide ______________________________________________________________________
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Digital I/O Module
1004-041 Figure 6 Digital I/O Module QMI118
The QML logger provides the possibility to extend the I/O capacity with
the optional digital I/O module (QMI) equipped with eight inputs and
eight outputs. The digital I/O module interfaces to the logger via the SPI
connector. The module is located inside the enclosure beside the logger
and it conforms to the same environmental immunity and emission
standards as the logger.
The module has eight open collector outputs with 30 VDC/1 A
continuous drive capability and LED indicators. The eight inputs of the
module tolerate voltages from 0 to 25 VDC (the absolute maximum
30 VDC) and they have 40 ms (typical) contact debouncing circuitry.
The module allows connection of slow pulse inputs, for example, with
tipping bucket rain gauges.
NOTE The digital I/O module can only be connected to the QML201 logger
or newer. The type of the logger can be checked with the VER
command.