Vaisala HydroMet Service Manual download pdf (Page 17)

Chapter 2 __________________________________________________________ Main Components

VAISALA________________________________________________________________________ 15

The main characteristics of the QMI108 module are:

• The module interfaces to the logger via the SPI connector, therefore

it does not use any RS- channels.

• The module has eight (8) open collector outputs with 30 VDC / 1 A

continuous drive capability and LED indicators.

• The eight (8) 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 conforms to the same environmental immunity and

emission standards than the logger.

• The module also allows connection of slow pulse inputs, e.g. tipping

bucket rain gauges.

• The module is located inside the enclosure beside the logger.

Display and Keyboard Units

The MAWS301 HydroMet systems can be equipped with optional

display and keyboard units at installation sites where an operator

needs to see data locally and/or insert some own observations or

reference data into the system. There are three different models of

QMD - display and keyboard units utilizing the same hardware and

software technology.

The QMD displays are programmable LCD displays with back light..

They can show several lines of alphanumeric data. The full display

size expressed in characters is 20*6 (width * height). The QMD

displays include keypad with user-friendly menu, whose content is

also configurable by the user. The displayed data is sent as reports to

the display. The contents, format and updating intervals of these

reports are user configurable. The update interval can be anything

between 1 second and 24 hours. The QMD displays are for:

• Viewing data messages whose contents are freely configurable by

the user using the MAWS Lizard Setup software.

• Setting up of an extended set of system parameters

• Performing one-point calibration in the field (gain & offset)

• Entering data and/or text messages via the keyboard.

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Vaisala HydroMet Service Manual Page 17