Technical Documentation
BLR-CM Modbus
Rev. 05
2018-09
4
Important information!
If this sign appears besides a text passage, the reader is strongly advised to read the corresponding information. It
may provide important information about the usage of the device, safety advices or information about the correct
handling of the device. If the information is disregarded, the device may be inoperable or even damaged!
Additional Modbus protocol can be found at www.modbus.org.
The Modbus standards are also available from there.
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Overview
The Modbus communication interface of the reactive power controller CM offers the possibility to read out
measurement values or adjusting settings. This can be done by remote computer systems.
Attention: The BLR-CM can send max. 30 Values per request
The present manual describes the data transmission using the Modbus protocol, which defines methods of data
transport and addressing, but does not generally determined a specific transmission medium (physical transmission
level).
The reactive power controller CM uses the industrial standard RS485 for data transmission. This bus system offers the
possibility to operate several devices at the same bus cable.
A multitude of commercial devices and programmable logic controllers (PLC) are compatible with the Modbus protocol,
which is why a bus system can be set up with little effort.
!