Vaisala WAC155 Guide de l'utilisateur télécharger pdf (Page 13)

Chapter 2 __________________________________________________________ Product Overview

VAISALA_______________________________________________________________________ 11

CHAPTER 2

PRODUCT OVERVIEW

This chapter introduces the features of the Vaisala Serial Wind

Transmitter WAC155.

Introduction to Vaisala Serial Wind Transmitter

WAC155

The Vaisala Serial Wind Transmitter WAC155 converts the digital data

supplied by the Vaisala 151 and 252 Series wind sensors for use in the

RS-485 bus. The WAC155 transmitter consists of a component board in

a junction box and a cross arm for mounting the wind sensors; see

Figure 1 on page 12.

The WAC155 unit is installed underneath the cross arm, and it

communicates with the controlling system via a twisted pair RS-485

cable. The electrical connections to the sensors are 6-bit parallel gray-

code for the direction measurement and up to 750Hz digital pulse for the

wind speed measurement (anemometer).

The power to the sensors is supplied through the WAC155 transmitter.

The transmitter accepts 9 ... 15.5 VDC as input power. The WAC155

transmitter also provides the sensors with a throughput for optional

heating power. The unit automatically connects the heating power in

temperatures below +3 °C (default setting).

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Vaisala WAC155 Guide de l'utilisateur Page 13