IRS31Pro-UMB
Operating Manual V10 / 01.2020
G. Lufft Mess- und Regeltechnik GmbH
46
70
1070
Result message
Road surface condition
FBZ
8 bit
0 … 255
0
Road is completely
dry and free of snow and ice.
1
Road is moist or wet,
or covered with ice or snow
32
Road is wet with
liquid
water
/
aqueous
solution.
64
Road is fully or
partially covered with frozen
water / solid aqueous solution.
65
Road is covered with
snow or slush.
66
Road is covered with
ice (solid, frozen water and
frozen aqueous solution).
67
Frost.
255
Sensor is unable to
determine the road surface
condition due to the prevailing
conditions.
72
1072
Result message
Water film height
WFD
16 bit
0.00…10.00
mm
0.01 mm
0
= 0d
=
0000h
10.00 = 1000d =
03E8h
Error ( 65535d
= FFFFh=
73
1073
Result message
Thawing material
concentration
TSK
8 bit
0…100
1%
0
= 0d
=
00h
100
= 100d
=
64h
Error (255d = FFh)
74
1074
Result message
Thawing material per square
meter
TSQ
8 bit
0…100
1g/m
2
0
= 0d
=
00h
100
= 100d
=
64h
Error (255d = FFh)
75
1075
Result message
Snow film height
SFD
8 bit
0 … 50 mm
1 mm
0
= 0d
=
00h
50
= 50d
=
32h
Error (255d = FFh)
76
1076
Result message
Ice film height
EFD
16 bit
0.00…2.00
mm
0.01 mm
0
= 0d
=
0000h
2.00
= 200d
=
00C8h
Error (255d = FFh)
77
1077
Result message
Road grip
GR
8 bit
0.00…1.00
0.01
0.00
= 0d
=
00h
1.00
= 100d
= 64h
Error (255d = FFh)
79
1079
Result message
Road surface condition for
winter services
FZW
8 bit
0 … 255
0
Dry
16
Moist
32
Wet
48
Extremely wet
64
Icy
129
1129
Result message
Ice percentage
EP
8 bit
0…100 %
1%
0
= 0d
=
00h
100
= 100d
=
64h
Error (255d = FFh)
18.3 Communication in Binary Protocol
Only one example of an online data request is described in this operating manual. Please refer to the
current version of the UMB Protocol for all commands and the exact mode of operation of the protocol
(available for download at
www.lufft.de
).
Note:
Communication with the sensor takes place in accordance with the master-slave principle, i.e.
there may only be ONE requesting unit on a network.
18.3.1 Framing
The data frame is constructed as follows:
SOH
Control character for the start of a frame (01h); 1 byte
<ver>
Header version number, e.g.: V 1.0
<ver> = 10h = 16d; 1 byte
1
2
3 – 4
5 – 6
7
8
9
10
11 … (8 + len)
optional
9 + len
10 + len
11 + len
12 + len
SOH <ver> <to> <from> <len> STX <cmd> <verc>
<payload>
ETX
<cs>
EOT
