Operating Manual V8.2/03.2017
Non Invasive Road Sensor
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
49
19.5.3 Address Configuration
UMB Device-ID and SDI-12 Address are related, 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.
UMB Device ID1 (default) corresponds to SDI-
12 Address ‘0’ (SDI-12 default).
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’
19.5.4 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 ‘3’ are in use.
The buffer assignment depends on the device variant (with / without pyrometer).
Buffers ‘1’
to ‘3’ are available only from devices with pyrometer.
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.
Note:
The configured system of units 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+251.4+30.0+2<CR><LF>
Water film 251.4µm, ice percentage 30.0, road condition 2
0D1!
0+12.4-5.1<CR><LF>
Road surface temperature 12.4°C, freezing temperature -5.1°C
0D2!
0+3.4+25.3<CR><LF>
snow height 3.4mm, saline concentration 25.3%
0D3!
0+0.4+1<CR><LF>
friction 0,4, road weather index 1
(values for illustration purposes only)
