Chapter 2 __________________________________________________________ Product Overview
VAISALA _______________________________________________________________________ 17
PWD22/52 Output
The PWD22/52 output is either:
- Digital serial interface
The digital serial interface can be configured in two different
operating modes: the sensor can be set to send a data message
automatically at selected intervals, or PWD22/52 can be polled
by the host computer. The same serial line also acts as an
operator interface.
- Analog current signal
The analog current signal can be used to report the prevailing
visibility. Three relay controls can be used, driven by visibility
limits.
The operator controls PWD22/52 using a maintenance terminal. Built-in
commands and test routines are provided for configuring and monitoring.
The standard data messages contain a status character indicating faults
detected by internal diagnostics. If the error status is set, the operator can
view a status message containing the detailed diagnostics results and a
description of the fault. The operator and maintenance personnel use this
information to take corrective action.
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