Lufft WS501-UMB User Manual

Operating Manual Compact Weather Station
92 G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
18.7.2.3 Function 0x04 Read Input Registers
Theinput registersare containing the measurement values of the compact weather station
and the related status information.
The measurement values are mapped to the 16bit registers using scaling factors (0 … max.
65530 for unsignedvalues, -32762 … 32762 for signedvalues).
Values 65535 (0xffff) resp. 32767 are used for the indication of erroneous or not available
measurement values. A more detailed specification of the error can be evaluated from the
status registers.
The assignment of values to the available register addresses (0 … 124) has been arranged
in a way so that the user can read the most frequently used data with few (ideally only one)
register block requests
Following blocks have been defined:
 Statusinformation
 Frequently used values which are independent of the unit system (metric / imperial)
in use
 Frequently used values in metricunits
 Frequently used values in imperial units
 Other measurement values
When using the metric unit system the first three blocks can the supply all data usually
required with one request.
There is no difference in the register assignment between the sub types of the WS family. If,
dependent on the type, some value is not available, this will be indicated by setting the
register to the error value.
For detailed information about measurement ranges, units etc. please refer to the related
description of the UMB channels (Chapter 6 and 18.1)
Reg.
No.
Reg.
Addr
Value (UMB
Channel)
Range
Scaling Factor,
Remarks
Status Information
1
0
Identification
Low Byte: WS-Type (2,3,4,5,6)
High Byte: Software Version
2
1
Device Status
3
2
Sensor Status 1
Air temperature, air temperature
buffer, dew point, dew point buffer
Coding 4 bit per
status, see below
4
3
Sensor Status 2
Rel.humidity, rel.humidity buffer,
abs.humdity, abs.humidity buffer,
Coding 4 bit per
status, see below
5
4
Sensor Status 3
Mixing ratio, mixing ration buffer,
air pressure, air pressure buffer
Coding 4 bit per
status, see below
6
5
Sensor Status 4
Wind, wind buffer, compass,
precipitation
Coding 4 bit per
status, see below
7
6
Reserve
8
7
Reserve
9
8
Reserve
10
9
Diagnostic: run time in 10sec steps

Lufft WS501-UMB Specifications

General

Brand	Lufft
Model	WS501-UMB
Category	Weather Station
Language	English