Vaisala AWS330, User Manual

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Chapter 8 ____________________________________________________________ Technical Data
VAISALA ______________________________________________________________________ 243
Digital I/O Module QMI118
1004-041
Figure 130 Digital I/O Module QMI118
The QML logger provides the possibility to extend the I/O capacity with
the optional digital I/O module QMI118 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 four open collector outputs and four outputs with high
side switching capability. This means the module can switch, for
example, +VB directly to the peripheral that needs it without additional
relays. The high side outputs have the same rating as the open collector
outputs, 30 VDC / 1 A, and 40 ms (typical) contact debouncing circuitry.
They have a common positive terminal lVB. The voltage does
not have to be system battery voltage but can vary from 3.3 V to 30 V.
Note that the GND pin associated with the output block of O4 ... O7
should always be wired to the system GND if any of the outputs are used
to switch currents that exceed 10 mA.
Table 73 QMI118 Technical Data
Property Description/Value
Max. voltage all outputs, +VB 30 VDC
Max. current all outputs 1 A
Max. voltage all inputs ±25 V
Input default state ON (max. 100 k weak pull up to 3.3 V
built in)
Input debounce duration 40 ms typ., 60 ms max.
Input threshold 2 V
Input hysteresis 300 mV