Datakom DKM-411 Applications Manual
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Datakom DKM-411 Applications Manual

Modbus
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DKM-411 Modbus Application Manual
V3.0
(15.01.2017)
MODBUS APPLICATION MANUAL
DKM-411
- 1 -

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Summary of Contents for Datakom DKM-411

  • Page 1 DKM-411 Modbus Application Manual V3.0 (15.01.2017) MODBUS APPLICATION MANUAL DKM-411 - 1 -...
  • Page 2 This applies in particular to trademarks, model denominations, part numbers and drawings. ABOUT THIS DOCUMENT This document describes minimum required details for the successfull interfacing of the DKM-411 family units to 3rd party Modbus and Modbus-TCP/IP based applications. Follow carefully advices given in the document. These are often good practices for the installation of genset control units which reduce future issues.

  • Page 3: Modbus Configuration

    DKM-411 Modbus Application Manual V3.0 (15.01.2017) MODBUS COMMUNICATION BASICS The Modbus communication is widely used in the connection of industrial control units to various management systems for remote monitoring and control. It has begun the basic industry standard in the last decades.
  • Page 4 Ethernet Subnet Mask: Should be set in accordance with your local switch configuration. The complete Ethernet port specifications are found in the DKM-411 User Manual. Please rewiev the document Ethernet Configuration Guide for DKM-411 for more details about the ethernet port setup.
  • Page 5 DKM-411 Modbus Application Manual V3.0 (15.01.2017) Modbus Modbus-TCP/IP address port Modem Modem Selection Baud Rate RS-485 port enable RS-485 Baud Rate - 5 -...
  • Page 6 DKM-411 Modbus Application Manual V3.0 (15.01.2017) User IP Masks Ethernet port enable Ethernet IP address Ethernet gateway IP Ethernet subnet mask GPRS enable - 6 -...

  • Page 7: Data Reading

    DKM-411 Modbus Application Manual V3.0 (15.01.2017) DATA READING The function 03 (read multiple registers) will be used for data reading. The MODBUS master will send a query. The answer will be one of the below: -A response containing the requested data -An exceptional response indicating a read error.
  • Page 8 DKM-411 Modbus Application Manual V3.0 (15.01.2017) DATA WRITING (SINGLE REGISTER) The function 06 (write single register) and the function 16 (write multiple registers) are used for data writing. The MODBUS master will send a query containing data to be written. The answer will be one of the below: -A normal response confirming successful write, -An exceptional response indicating a write error.
  • Page 9 DKM-411 Modbus Application Manual V3.0 (15.01.2017) DATA WRITING (MULTIPLE REGISTERS) The function 06 (write single register) and the function 16 (write multiple registers) are used for data writing. The MODBUS master will send a query containing data to be written. The answer will be one of the below: -A normal response confirming successful write, -An exceptional response indicating a write error.

  • Page 10: Crc Calculation

    DKM-411 Modbus Application Manual V3.0 (15.01.2017) CRC CALCULATION Here is a procedure for generating a CRC: 1) Load a 16–bit register with FFFF hex (all 1’s). Call this the CRC register. 2) Exclusive OR the first 8–bit byte of the message (the function code byte) with the low–order byte of the 16–bit CRC register, putting the result in the CRC register.

  • Page 11: Register Definitions

    DKM-411 Modbus Application Manual V3.0 (15.01.2017) REGISTER DEFINITIONS ADDRESS R / W DATA COEFF. DESCRIPTION (decimal) SIZE 8192 R / W 16bit Year (0-4095) 8193 R / W 16bit Month (1-12) 8194 R / W 16bit Date (1-31) 8195 16bit...
  • Page 12 DKM-411 Modbus Application Manual V3.0 (15.01.2017) ADDRESS R / W DATA COEFF. DESCRIPTION (decimal) SIZE 12460 32bit Demand I1 12462 32bit Demand I2 12464 32bit Demand I3 12466 32bit Demand In 12468 32bit x100 Demand kW 12470 32bit x100 Demand kVAr...
  • Page 13 DKM-411 Modbus Application Manual V3.0 (15.01.2017) ADDRESS R / W DATA COEFF. DESCRIPTION (decimal) SIZE 20480 32bit Phase L1 voltage 20482 32bit Phase L2 voltage 20484 32bit Phase L3voltage 20486 32bit Phase L1-L2 voltage 20488 32bit Phase L2-L3 voltage 20490...
  • Page 14 DKM-411 Modbus Application Manual V3.0 (15.01.2017) HARMONICS AND WAVEFORM INFORMATION ADDRESS R / W DATA COEFF. DESCRIPTION (decimal) SIZE 20548 ... 4624bit Phase L1 voltage, harmonics and waveform buffer 289x16 20837 ... 4624bit Phase L2 voltage, harmonics and waveform buffer 289x16 21126 ...
  • Page 15 DKM-411 Modbus Application Manual V3.0 (15.01.2017) ADDRESS R / W DATA COEFF. DESCRIPTION (decimal) SIZE 23440 64bit Alarm bits. Bit definitions are given at the end of the document. 23444 64bit Warning bits. Bit definitions are given at the end of the document.
  • Page 16 DKM-411 Modbus Application Manual V3.0 (15.01.2017) LIST OF ALARM BITS 00: High Voltage 01: Low Voltage 02: High Frequency 03: Low Frequency 04: High kW 05: Low kW 06: High kVAr 07: Low kVAr 08: High power factor 09: Low power factor...

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