Vaisala WMT700 - Manual (Page 45)

Chapter 3 _______________________________________________________ Functional Description
Host System Connections and Interfaces
WMT700 always needs a host device for measurement data
collection and presentation. The host device is usually an
automatic weather station, but other host devices such as data
loggers or personal computers can also be used.
WMT700 performs calculation, quality control, and data format
procedures on the measurement data. The processed data is sent to
weather stations using serial ports and/or analog output channels.
The most commonly used communications interface is RS-485,
but WMT700 has a flexible set of interfaces ranging from RS-232
to voltage and current mode analog signals.
You can set WMT700 to send measurement data as either analog
output or data messages via a serial port, or you can use both
outputs simultaneously. Operating and configuring commands are
sent to WMT700 through the serial interface.
Operation and heating power is usually provided from one power
supply. You can also use separate power supplies for the heating
and operation to prevent the heating function from consuming the
operation power. In a split-supply system there can be a separate
backup power supply for the operating power supply.
Figure 15 on page 44 shows the main software components and
external interfaces of WMT700.
VAISALA ________________________________________________________________________ 43