IRS31Pro-UMB
Operating Manual V10 / 01.2020
G. Lufft Mess- und Regeltechnik GmbH
37
12 Coupling with ARS31/ARS31Pro-UMB
When the coupling IRS31-ARS31 is active, the IRS31Pro-UMB uses the mixture independent freezing
temperature reported by an ARS31(Pro)-UMB Sensor instead of its own for the calculations of road
condition, ice percentage and friction. When the coupling is active the IRS31Pro-UMB delivers the status
code 0x36h = 54d (channel_off) on every freezing temperature and salt concentration channel.
System requirements:
UMB system with at least one IRS31Pro-UMB and at least one ARS31-UMB or ARS31Pro-UMB.
From ARS31 (Pro)-UMB at least (better: exactly) one of the channels 150, 151, 152, 153, 154,
155, 160, 161, 162 or 1065 must be polled cyclically using the UMB binary protocol. Whether or
not the command for multi-channel query, or the single-channel query is used is not relevant.
The ID of the associated ARS31 (Pro)-UMB must be configured in IRS31Pro-UMB.
12.1 Configuration of coupling within IRS31Pro-UMB:
Figure 23 Configuration of coupling IRS31-ARS31
With the control “freezing temperature mode” Active/Switched off the takeover of the freezing temperature
of an ARS31(Pro)-UMB can be enabled or disabled.
ARS31-UMB ID contains the ID of the ARS31-UMB sensor from which the freezing temperature channels
are monitored. When this is set to 0 (the default) the responses of all ARS31(Pro)-UMB are evaluated.
ARS31-UMB timeout sets the time after which the IRS31Pro-UMB resets a freezing temperature reported
by an ARS31(Pro)-UMB. After this time an IRS31Pro-UMB uses a freezing temperature of -0.1°C for all
model calculations. This usually should be a time 3-5 times the time between 2 measurement queries of
an ARS31(Pro)-UMB.
Example 1: A Lufft LCom queries measured values from a UMB system once in 60 seconds. As
recommended timeout a value of 3-5 times 60 seconds (180-300 seconds) is calculated.
Example 2: A Smartview3 queries measured values from a UMB system once in 10 Minutes. As
recommended timeout a value of 3-5 times 10 times 60 seconds (1800-3000 seconds) is calculated.
With polling of channel 950 "State of coupling" (State of the coupling), the current state of the freezing
temperature acquisition from the ARS31(Pro)-UMB can be determined.
The following code applies:
