Vaisala WAC155 - Manual (Page 33)

Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 31
CHAPTER 4
OPERATION
This chapter contains information that is needed to operate the Vaisala
Serial Wind Transmitter WAC155.
User Interface
The WAC155 does not provide a direct user interface, except for a
status indicator LED on the component board. The LED will flash green
when the operational status is OK, and red when there is an error
condition. The LED is activated for five minutes after the transmitter is
powered up. The LED is also activated when the service connection is
open.
The red LED does not indicate the type of the error. Service personnel
must connect to the service connection to resolve the problem.
Data and service connections are provided over the RS-485 interface.
These connections are described in the next section.
Communication Interfaces
The WAC155 transmitter communicates over a half-duplex RS-485
interface. The WAC155 can be configured to send wind data messages
at regular intervals (auto-transmit mode), and it can provide the data as
a response to an MWV query. The data is provided in standard NMEA
wind speed and angle messages. In addition, a service interface is
available for configuration and status information.