Vaisala FD12P - Manual (Page 59)

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 59
CHAPTER 4
OPERATION
This chapter contains information needed to operate this product.
Introduction
The FD12P Weather Sensor is a fully automatic instrument for
continuous weather measurement. Normally, the FD12P Weather
Sensor is either set to send a data message automatically or it is polled
by a host computer. In addition, a set of user commands is provided
for configuring and monitoring the system performance. These
commands can be given in the command mode. See section
Entering/Exiting the Command Mode on page 61.
The FD12P Weather Sensor has seven different standard message
formats for data message output. The FD12P presents the weather
type using the World Meteorological Organization (WMO) code table
4680 (W
a
W
a
Present Weather reported from an automatic weather
station). Code numbers 77 (snow grains), 78 (ice crystals), and 89
(hail) are from the code table 4677 because the types are not included
in the code table 4680. In addition, the United States National
Weather Service (NWS) abbreviations are available. The list of NWS
and WMO codes is presented in Appendix A on page 143.
User Commands in Normal Operation
User intervention is not required in the normal operation of the FD12P
Weather Sensor. Operator commands are used only in the initial set-
up and during routine maintenance. Several commands are also
available for troubleshooting.