Instructions; Definition And Abbreviation; References - Beko METPOINT BDL Compact Installation And Operating

METPOINT ® BDL Compact

2. Instructions

This manual is intended to provide instructions for the installation and use of the BDL Compact MODBUS
function. The BDL Compact MODBUS function can let the MODBUS client device to read out the online
measurement values. This manual is not intended to be a complete tutorial on the MODBUS RTU protocol,
and it is assumed the end user already has a general working knowledge of MODBUS RTU Communications,
especially in respect of client station configuration and operation. However an overview is included in the
following section to explain some of the fundamental aspects of the protocol.
2.1 Definition and abbreviation
CRC Cyclic Redundancy Check
Used for error—checking in MODBUS RTU. See appendix
Modbus client A MODBUS device, which is able to access data in one or more connected MODBUS
servers
Modbus server A MODBUS device, which is able to respond to requests from a single MODBUS client
Modbus Address Throughout this document the following notation is used to address
MODBUS RTU registers see chapter 8
Addressing: Holding Register 1009 is addressed in messages by 1008
PDU MODBUS protocol data unit
ADU MODBUS application data unit
MBAP MODBUS application protocol
RS485 Refers to the 2—wire communication standard defined by EIA/TIA-485. (Physical layer)
Ethernet

2.2 References

1. MODBUS over Serial Line Specification and Implementation Guide V1.02 modbus.org 2006 Dec 20
2. MODBUS APPLICATION PROTOCOL SPECIFICATION V1.1b modbus.org 2006 Dec 28
3. MODBUS Messaging on TCP/IP implementation Guide V1.0b 2006 Oct 34
4. BDL Compact operation manual
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Daisychain setup