2.0 Configuration and Modbus map
User’s Manual GW-DLMS-232-ISK
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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