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Vaisala weather station

Description

The Vaisala WXT520 is a multi-sensor weather station with no moving parts.

Measurements of wind speed, direction, humidity, temperature, pressure and

rainfall can be reported and logged. For more information refer to the Vaisala

website and WXT520 documentation.

Electrical connection

• The WXT520 is an RS485 serial communications device

• When supplied buy Observant (VIK) the WXT520 comes pre-wired with

the Observant 4-way device connector

• For an existing WXT520 Table 19 show the required internal wiring

connections

• The standard C3 device cable (DTC) is 6 m in length, this may be

shortened if desired by re-wiring the terminal block end

• If a longer cable run is needed the 10 m device extension cable (DTE) can

be used

• Either RS485 port on the C3 may be used

• Figure 27 shows connection of the WXT520 to a C3 using Observant’s

standard 4-way device cables

WXT520

Label

WXT520

Terminal

Connection

Wire

Colour

VIN+ 20 Red

TX+ AND RX+ 2 AND 4

Blue

TX- AND RX- 1 AND 3

Yellow

VIN- 19

Green

Table 19. Vaisala WXT520 internal electrical connections

4. Appendix

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DAVIS Electronic Rain Counter Betriebsanweisung Seite 57