Vaisala HydroMet User's Guide download pdf (Page 28)

User's Guide ______________________________________________________________________

26 ___________________________________________________________________M210784EN-E

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.

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Vaisala HydroMet User's Guide Page 28