57
9.3.4
Multiple RS-485 devices
As each digital sensor usually has a unique address, multiple sensors can be connected to the RS-485
port of the MRL-7.
!
Attention
If multiple sensors need to be connected, assign a unique address to each de-
vice!
9.3.5
Managing RS-485 devices with Commander
The Commander can be used to connect and manage RS-485 devices connected to the MRL-7 data
logger. Follow the steps below to do this:
1.
Connect your RS-485 devices is illustrated in the examples of Section
sure all devices are powered.
2.
Establish a connection with the MRL-7 as explained in Section
3.
Define a station as describes in Section
4.
In the
Parameters (F2)
tab download the parameters of the MRL-7.
5.
) to
on
.
6.
In the
Stations (F7)
tab click
Scan devices
. The Commander will now search for all RS-485 devices
connected to the data logger and will add them to the station information.
Now, the parameter lists of all devices can be downloaded and the configurations be adapted.
9.3.6
Reading data from an RS-485 device
Many digital sensors push their measurement data in a specified interval to the RS-485 interface, and
the MRL-7 data logger only needs to read these data.
As an example, the SOMMER SQ-X water discharge sensor can be set to measure water discharge at
an appropriate interval. The acquired data can be read with the MRL-7 by wiring the data logger ac-
cording to
Figure 21: Wiring of SQ-X water discharge sensor with RS-485 interface
The SQ-X in this example is configured in
Additionally,
