Operating Manual Smart Weather Sensor
104 G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
19.6.5 Additional Measurement Commands
With the additional measurement commands
aM1! … aM8!
aMC1! … aMC8! (M-Command, data transmission with CRC)
aC1! … aC8!
aCC1! … aCC8! (C- Command, data transmission with CRC)
The complete data sets of the Smart Weather Sensor, as defined for the UMB protocol are
available in a SDI-12 environment as well.
The measurement values are ordered according to sensor types.
Equally to the base data sets max. 9 values can be requested with an additional M
command, while an additional C request allows for up to 20 values.
The buffer assignment as documented in the following paragraphs has consequently been
structured in a way that with each M command the buffers D0 and D1 are used. If the
respective sensor type has more values available the buffers D2 up to D4 will be occupied if
required.
M1 / C1 Temperature M: 9 Values C: 9 Values
M2 / C2 Humidity M: 9 Values C: 13 Values
M3 / C3 Air Pressure M: 9 Values C: 9 Values
M4 / C4 Wind M: 9 Values C: 14 Values
M5 / C5 Compass M: 1 Values C: 1 Values
M6 / C6
WS401/601: Precipitation,
Leaf Wetness M: 9 Values C: 9 Values
Others: Precipitation M: 4 Values C: 4 Values
M7 / C7
WS800-UMB: Global Radiation,
Lightning Sensor M: 9 Values C: 10 Values
Others: Global Radiation M: 4 Values C: 4 Values
M8 / C8 Ext. Temperature M: 1 Value C: 1 Value
If the sensor type requested with the measurement command is not available with the actual
variant of the Smart Weather Sensor (WS200-UMB ... WS700-UMB) the device will respond
with
a0000<CR><LF> resp.
a00000<CR><LF>
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