MARCOM GW-DLMS-232-LG User manual

U SER’S M ANUAL
Gateway DLMS-MODBUS for ISKRA
with RS232
P/N: GW-DLMS-232-LG
Edition 2.0
MARCOM SRL
Phone [phone]
Email: [e-mail]
Via Mezzacampagna 52 (int. 29)
www.marcomweb.it

Revision Sheet
User’s Manual GW-DLMS-232-ISK Page i
Revision Sheet
Release
No.
Date
Revision Description
Rev. 0 10/05/14 User’s Manual Template and Checklist
Rev. 1 10/06/16 Conversion to new format
Rev. 2 31/01/17 New HomeDLMS page
Rev. 3 20/05/18 New hardware configuration pages
Rev. 4 08/11/18 MT880 meter

User’s Manual GW-DLMS-232-ISK Page ii
USER'S MANUAL
TABLE OF CONTENTS
Page #
1.0 GENERAL INFORMATION ..................................................................................................... 3
1.1 System Overview...................................................................................................................3
1.1.1 ISKRA MT880 compatibility......................................................................................................................3
1.2 Features.................................................................................................................................4
1.2.1 Connections ...........................................................................................................................................4
1.2.2 Digital Input connection ........................................................................................................................4
1.2.3 Serial port connections...........................................................................................................................5
2.0 CONFIGURATION AND MODBUS MAP................................................................................ 6
2.1 Web Visualization .................................................................................................................6
2.2 Communication with energy meter ......................................................................................7
2.3 Gateway Settings...................................................................................................................7
2.4 Modbus Mapping Area.........................................................................................................9
3.0 COMMUNICATION ERRORS................................................................................................ 13
3.1 Type of error ....................................................................................................................... 13
4.0 MECHANICAL FEATURES................................................................................................... 14

2.0 Configuration and Modbus map
User’s Manual GW-DLMS-232-ISK Page 3
1.0 GENERAL INFORMATION
1.1 System Overview
DLMS (Device Language Message Specification) Protocol is used in meters field and specifically in
electric Energy meter to readout consumption and other values. The reference standard is EC 62056.
This standard defines services which permit to read objects, OBIS defined. Inside these objects are
mapped running meter values using standard profiles.
By Gateway DLMS-MODBUS is possible to read DLMS energy meter’s data using MODBUS RTU or
MODBUS TCP protocol. The gateway is completely transparent to DLMS protocol, so user must know
only Modbus protocol.
This Gateway version reads data from up to two counters through the RS232 ports and provides value
to RS485 port MODBUS RTU slave and on an Ethernet port Modbus TCP Server (up to 3 client
connections).
1.1.1 ISKRA MT880 compatibility
The MT880 counter is not compatible with the gateway by default.
It is therefore recommended to ask the installer / seller of the counter to change the
counter configuration like this:
activate the IEC62056-21 protocol on the serial port to be connected to the gateway
reduce to a maximum 2 the number of previous values of the obis in the readout message of
the counter

2.0 Configuration and Modbus map
User’s Manual GW-DLMS-232-ISK Page 4
1.2 Features
1.2.1 Connections
Gateway has following communication ports:
•2 x Serial RS232 port to connect up to two energy meter
•1 x Serial RS485 port to read energy meter’s data by master Modbus RTU
•1 x Ethernet port to read Energy meter’s data by client Modbus TCP
•1 screw connector to supply gateway 10-30 VDC (min. 2 W)
•Front Signal LED for communication diagnostic
•2 x Digital Input (*)
•2 x Digital Output (*)
(*) Their status is mapped in Modbus registers.
1.2.2 Digital Input connection
The schema of two digital input/output connection is:

2.0 Configuration and Modbus map
User’s Manual GW-DLMS-232-ISK Page 5
1.2.3 Serial port connections
The schema of serial ports RS232 and RS485:

2.0 Configuration and Modbus map
User’s Manual GW-DLMS-232-ISK Page 6
2.0 CONFIGURATION AND MODBUS MAP
2.1 Web Visualization
To view the web pages containing the data read from the counter you need to connect to the network
using the Ethernet RJ45 port available on the gateway. By a web browser, just type the default
address 192.168.0.122.
In case of connection failure ensure that you have on your network card address on a subnet
192.168.0.X.
This brings us to the main screen of the Gateway with the values common to all Meter

2.0 Configuration and Modbus map
User’s Manual GW-DLMS-232-ISK Page 7
From this page, through the links at the top of the page, you can browse web pages that contain the
data for the single Meter or go on the configuration pages of the Gateway (Home PLC).
2.2 Communication with energy meter
In order to activate communication with energy meter user must insert in proper field Serial coder
Meter x the serial numbers of connected meters.
It’s possible to change baudrate of the port connected to meter from Serial port baudrate selection
in case meter works with speed different from 9600 that usually is standard.
Time between readouts can be set from 10 to 3600 seconds.
String debug is useful to understand the communication with meters.
With GATEWAY REBOOT button you can force the gateway to reboot.
The confirmation of the changes is recorded using the Submit button.
2.3 Gateway Settings
To change the gateway settings, such as IP address, you need access to the configuration pages
through the link HomePLC in the header of web pages that contain the data read from the counters.
The Home page summarizes the main information concerning the gateway as the serial and with the
navigation bar on the left you can move between the pages.
Credentials to login and modify parameters are: Username = Admin, Password = Admin.
Changes in gateway settings are applied to the gateway after a power reboot.

2.0 Configuration and Modbus map
User’s Manual GW-DLMS-232-ISK Page 8
To change the parameters of the serial connections (baudrate, parity) and ethernet, such as the IP
address, just go to the Devices page and, by clicking on the gear icon for the selected port, a popup
will open with the settings.
The two RS232 ports are COM0 and COM1 while the RS485 port is COM2.
Modifications to the COM0 and COM1 ports are not necessary as the parameters are forced by the
software.

2.0 Configuration and Modbus map
User’s Manual GW-DLMS-232-ISK Page 9
To change the modbus node of the RTU or TCP server, open the Protocols page and modify the
parameters of the desired interface.
2.4 Modbus Mapping Area
The data read from the meters are placed in the Holding Register area.
A copy of the values is also present in the 4x20000 holding register area.
In case of obis not found in the message from meter you will find -1 value.
Refresh time of the values is approximately: Time between readouts * N, where N is the number of
energy meters connected to gateway and configured with a serial number different from zero in
HomeDLMS.
Modbus addresses in the table are base 1; depending on used Modbus master, sometimes is required
to swap words to read data correctly.
OBIS
INDEX
OBIS
CODE METER COM0
METER COM1
DATA
TYPE NOTE
- - 4x40000 UINT DI 00
- - 4x40001 UINT DI 01
- - 4x40002 UINT DO 00
- - 4x40003 UINT DO 01
- - 4x40004 4x40006 ULONG Energy meter’s serial code to start communication
- - 4x40012 FLOAT Index reading meter
- - 4x40014 FLOAT Error number
0 F.F 4x40016 4x40216 LONG Error Code