Users Manual

Operating Instructions Smart Weather Sensor
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany 139
19.7.3.4 Function 0x04 Read Input Registers
The input registers are containing the measurement values of the Smart Weather Sensor
and the related status information.
The measurement values are mapped to the 16bit registers using scaling factors (0 … max.
65530 for unsigned values, -32762 … 32762 for signed values).
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:
• Status information
• Frequently used values which are independent of the unit system (met./ imp.) in use
• Frequently used values in metric units
• 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 19.1)
Reg.
No.
Reg.
Addr.
Value (UMB
Channel)
Range
Scaling Factor, Remarks
Status Information
1
0
Identification
High Byte: WS-Type (2,3,4,5,6)
Low Byte: Software Version
Type coding, see below
2
1
Device Status
3
2
Sensor Status 1
Air temperature buffer, air temperature, dew
point buffer, dew point(high byte -> low byte,
see table below)
Coding 4 bit per status, see
below
4
3
Sensor Status 2
Rel. humidity buffer, rel. humidity, abs.
humidity buffer, abs. humidity(high byte -> low
byte, see table below)
Coding 4 bit per status, see
below
5
4
Sensor Status 3
Mixing ratio buffer, mixing ration, air press.
buffer, air press. (high byte -> low byte, see
table below)
Coding 4 bit per status, see
below
6
5
Sensor Status 4
Wind buffer, wind, precipitation, compass(high
byte -> low byte, see table below)
Coding 4 bit per status, see
below
7
6
Sensor Status 5
Global radiation buffer, global radiation,
reserved, reserved (high byte -> low byte, see
table below)
Coding 4 bit per status, see
below
8
7
Sensor Status 6
External temperature / external rain gauge,
lightning sensor, lightning sensor buffer (see
table below)
Coding 4 bit per status, see
below
9
8
Reserve
10
9
Diagnostic: run time in 10sec steps