LKM LKM75X, Руководство по компонентам системы

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3. Receiver LKM751
3.1 General
The receiver is mounted in a standard rail housing and supplied with 24 V. It is
provided with several serial interfaces. The LKM751 device is able to communicate
with other components via a bus system which is integrated in the rail. At present,
this is the analogue unit. No external connections are required any more.
Furthermore, the receiver is equipped with an illuminated LCD which allows the
values of 2 or 4 channels to be displayed. The display mode is configured via the
software. Figure 3.1 shows the position of the various function elements.
If the
jumper for the write protection of the EEPROM is removed, the existing
configuration cannot be overwritten any more!
3.2 USB interface
The receiver is provided with a mini-USB interface by means of which it can be
configured, and the data can be read out. A corresponding program developed for
these tasks, as well as a suitable cable are supplied with each receiver. These
programs are described separately. The structure of the data sets is shown in the
Appendix. The USB interface enables the receiver to be supplied with voltage, too.
However, the analogue unit cannot be operated with it.
3.3 RS485 interface
This interface allows the data to be transmitted over longer distances. In addition,
also other evaluation units (PLC etc.) can be connected. This interface is also
designed as Modbus interface (switchable via software). Some more detailed
information can be found in the Modbus manual.
3.4 LCD
The LCD is backlit. Up to 4 measuring values can be displayed. The first four
registered transmitters are automatically displayed. Via the WPAN686 program, the
user may fix whether 2 or 4 values are displayed.