Vaisala WAC155, User Manual

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4. Operation
4.1 User Interface
There is a 2-color status LED on the Vaisala Serial Transmitter WAC155 component board. The
LED flashes green when the operational status is OK, and red when there is an error condition.
The LED is activated for 5 minutes after the transmitter is switched on. The LED is also
activated when the service connection is open.
The red LED does not indicate the error type. You must establish a service connection to find
the cause.
Data and service connections are provided over an RS-485 serial bus or service connector X5.
More information
‣ Error Messages (page 49)
4.2 Communication Interfaces
Vaisala Serial Wind Transmitter WAC155 communicates through a half-duplex RS-485 interface
accessible through terminals X2/7-8.
You can configure the transmitter to send wind data messages at regular intervals (auto-
transmit mode) or you can get the data as a response to an MWV query. The data is provided
in standard NMEA/MWV wind speed and angle messages. A service interface is available at
pin header X5 of the board.
You can connect more than one transmitter to a single RS-485 bus. In case of a single
transmitter, you can set the device to transmit data messages at a preconfigured interval. If
there are several transmitters in the bus, you can only poll data with the MWV query.
Each device in the same bus has a unique configurable ID, containing 1 … 5 characters.
Alphabetical characters a-z, A-Z (case-sensitive), and numbers 0-9 are accepted.
Table 6 WAC155 Default Serial Communication Settings
Property Description/Value
Baud rate 9600
Data bits 8
Parity None
Stop bits 1
The service interface at pin header X5 provides the same functionality as the RS-485 interface
at X2. Using the service interface affects the RS-485 interface since they share the same data
communication port on the WAC155 circuit board.
WAC155 User Guide M210822EN-E
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