User's Guide _______________________________________________________________________
4 ____________________________________________________________________ M211107EN-C
HEAT .......................................................................... 124
Other Commands ........................................................ 124
TIME ........................................................................... 124
DATE .......................................................................... 125
RESET ....................................................................... 125
VER ............................................................................. 125
Operating LM21 through Maintenance Port ........ 126
Serial Communication Settings .......................... 126
Serial Transmission RS-232................................ 126
Entering and Exiting Command Mode................... 127
OPEN Command .................................................... 127
CLOSE Command .................................................. 127
Available Commands .................................................. 128
Parameter Configuration ........................................... 130
Default Settings for FS11P Use ......................... 131
LM21 Standard Initialization ........................... 131
CHAPTER 5
THEORY OF OPERATION ................................................................ 133
Hardware Description ................................................... 135
Measurement Unit FSM102 ...................................... 135
Transmitter Unit FST102 ...................................... 135
Receiver Unit FSR102 .......................................... 137
Controller Board FSC102 ..................................... 139
Precipitation Identifier PWD32 ................................. 140
Optical Arrangement .............................................. 141
Transmitter Unit PWT11 ....................................... 141
Light Receiver .......................................................... 142
Additional Measurements ..................................... 142
Vaisala RAINCAP
®
Rain Sensor .................. 142
Interface Unit FSI102 .................................................. 143
Communication Controller Board FSC202 ..... 143
AC (Mains) Power Supply .................................... 144
Battery Backup ........................................................ 144
Frangible Mast .............................................................. 145
Software Description .................................................... 146
Measuring Sequence .................................................. 146
Visibility Measuring Principle .................................... 146
Calculations ................................................................... 147
Detecting Precipitation ............................................... 147
Precipitation Intensity ................................................. 148
Precipitation Accumulation ........................................ 148
Present Weather .......................................................... 149
Precipitation Types ................................................. 149
Liquid Precipitation ............................................ 149
Frozen Precipitation .......................................... 150
Mixed Precipitation ............................................ 150
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