Section 2 System Description
17
2.4.3 Two-Detector Operation
Two detectors have to be used on wide troughed chain conveyor
systems, e.g. for measurements on recycling paper. The second
detector has to be connected to a special slave evaluation unit. The
evaluation unit of the first detector works as a master. The count
rate and error messages of the slave system are transmitted to the
master via the RS 485 interface. See also the wiring diagrams on
pages 145 and 146.
Besides transmitting the count rates and possible error messages,
the slave has no further function. The master takes over control ofr
the entire measurement. Since both detectors are fully compatible,
it is irrelevant which of the detectors is connected to the slave or
to the master.
Figure 8: Master-slave wiring
With a 2-detector system, only the detector code has to be entered
at the slave.
See also Detector list on page 52 and Slave Menu on page 149.
Parameter setting and calibration are carried out on the Master. In
addition, the following parameter has to be set in the Master
menu, item Interface:
RS485: Slave
Number of detectors: 2
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