IRS31Pro-UMB
Operating Manual V10 / 01.2020
G. Lufft Mess- und Regeltechnik GmbH
54
18.5.3 Address Configuration
UMB Device-ID and SDI-12 Address are connected, but the different address ranges and the fact, that
UMB ID’s are integer numbers, while SDI-12 addresses are ASCII characters, have to be considered.
The SDI-12 address is built from the UMB device ID as follows:
UMB Device ID 1 (default) corresponds to SDI-12 Address ‘0’ (SDI-12 default).
Changing the SDI12 address by SDI12 setting command also modifies the UMB device ID accordingly.
Valid Address Ranges:
UMB (dec)
SDI-12 (ASCII)
1
to
10
‘0’
to
‘9’
18
to
43
‘A’
to
‘Z’
50
to
75
‘a’
to
‘z’
18.5.4 Data Messages
In the interest of simplified evaluation the assignment of measurement values to data buffers ‘0’ ... ‘9’ has
been defined unified for all measurement commands. For this reason the responses to C-requests have
been restricted to 35 characters, not using the 75 characters permitted for these requests
Currently buffers ‘0’ to ‘2’ are in use.
As with M-requests max. 9 values may be transmitted; the base data set of 9 values has been assigned
to buffers ‘0’ and ‘1’. Buffer ‘2’ contains further measurement values. This definition guaranties the
compatibility to loggers designed according to older versions of the SDI-12 standard.
If the measurement value is not available for some reason, e.g. sensor failure, this is indicated by a value
of +999.0. or -999.9 The logger can then evaluate the reason of failure by a aV! Verification request. The
following tables show the measurement values in the sequence they are arranged in the telegram (see
example).
Depending on the configuration of the device the values will be transmitted in metric or US units.
Another setting defines if the sensor transmits average or spot values of the measurement data. Default
setting and recommended is the transmission of average values.
Optionally the defrosting agent in use can be selected. (this option is currently not yet available).
Note:
The configured system of units and the average/sot setting is not indicated in the data messages.
The logger may request this setting with the I-command and adjust the evaluation of the data messages
accordingly
Example: M Request
0M!
00009<CR><LF>
9 measurement values are available
0D0!
0+1.5+2.7+3.5-5.5+3.7<CR><LF>
Road temperature 1.5°C, external temperature 1 2.7°C,
external temperature 2 3.5°C, freezing temperature -5.5°C
Salzkonzentration 3,7%
0D1!
0+183+0.0+0.78+15<CR><LF>
Water film height 200um, ice percentage 0.0%
friction 0.78, road condition 15 (moist)
Содержание 8910.U050
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