KNX Interface

Additional communication modules for energy-meter

The KNX interface (1 module wide, DIN rail mount) is intended for connecting the energy meter to KNX bus. KNX bus is widely used for home and building control applications. The interface receives the measurement data from the energy meter by means of the infrared port available on the side of the energy meter itself, and gets the power supply from the bus. Only the bus wiring (twisted pair) must be connected, no additional wiring is required. The interface is suitable for both single-phase () and three-phase energy-meter (DRB-80-3P).

Configuration

The interface is provided with an application program to be imported in ETS3, in order to allow the configuration of the communication. ETS3 is the standard software for KNX systems configuration.

Measurements

All the active and reactive energy, voltage, current, active, reactive, apparent power, power factor, frequency registers available on the measuring instrument can be transmitted over the bus. Transmission modes are available: transmission on request, automatic transmission based on adjustable energy account increment (for instance a message every 10 KWh). Status bytes are available as well, containing information about the status of the energy meter and the load (load type, running Tariff, energy import or export and so on). (Some measurements and status information are available only on selected models).

Voltage limits

Upper and lower voltage limits can be set via ETS3. A warning message will be sent over the bus by the interface, in case the voltage value goes beyond the limits.

Energy reset

Commands can be sent via bus to the interface for resetting the energy accounts (enabled only on selected measuring instruments models).

KNX Interface (DRM-KNX) Data Sheet

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Modbus interface RTU and Ascii DRM-MOD

The product is intended to be placed side by side to an energy meter, equipped with an infra-red port on the side, to collect the measurements data from the instrument and to transmit them via an RS-485 serial line to a remote collection station using Modbus protocol.

The communication module automatically recognizes the instrument connected to its infra-red port and is in the position to transmit all the data provided by the instrument itself.

Configuration

The interface is provided with a software tool for Windows software, for configuring installation parameters (such as Modbus address and baudrate) and general settings.

Plug and play

The interface is enabled to recognize automatically the instrument connected to its infra-red port. This is an advantage in terms of flexibility, because the same interface can be connected, to single-phase or three-phase energy meters.

Measurements

The interface acts as a Modbus slave, so that the transmitted measurements can be collected and displayed using one of the software tools available on the market enabled to act as a Modbus master.

Baudrate

The interface is enabled to operate with a number of baudrates, up to 115200 baud. The pure speed of transmission is limited by the band capacity which is 9600 baud on the IR interface:

1 standard module housing (18mm wide), suitable for DIN-rail mounting 35mm

MODBUS INTERFACE RTU AND ASCII DRM-MOD FEATURES

  • Interface available:
    – type BIG ENDIAN: for energy, power, voltage, current, cos and frequency, etc.

  • Modbus Ascii and Modbus, RTU protocols
  • Suitable for both single-phase and three-phase energy-meter
  • 1 DIN module wide (18mm)

M-Bus Interface DRM-M Data Sheet

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M-Bus Interface DRM-M

Additional communication modules for energy-meters (DRB-80-3P)

The M-Bus interface (1 module wide, DIN rail mount) is intended for connecting the energy meter to M-Bus. M-Bus is a standard widely used for remote reading of various types of consumption meters and sensors. The interface receives the measurement data from the energy meter by means of the infrared port available on the side of the meter itself, and gets the power supply from the bus, so that only the bus wiring (a two-wire standard telephone cable) must be connected, no additional wiring is required. The interface is suitable for both single-phase and three-phase energy-meter.

Measurements

M-bus interface is for remote reading of all of the energy, power, voltage, current, frequency, power factor registers. Status byte are available as well, containing information about the status of the energy-meter (running tariff nominal, voltage and current range overflow).

Commands

Commands can be sent via M-Bus to the interface for resetting the energy accounts. Commands are enabled only on relevant measuring instruments models.

Cable length M-Bus according to EN13757-2 Annex E

Cable type:

  • Shielded telephone cable 0.5mm2 (0.8mm) (typ. 4×0.8mm)
  • NYM-cable (1.5mm2 standard cable)

M-Bus Interface DRM-M Features

  • Interface for energy, power, voltage, current, cos and frequency, etc.
  • M-Bus according to EN1434
  • Suitable for both single-phase and three-phase energy-meter, network analyser and power-meters
  • 1 DIN module wide (18mm)

M-Bus Interface DRM-M Data Sheet

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DRB Energy-Meters Three-Phase 80-3P

Digital active energy-meter for imported and exported energy – 2 tariffs – 2 SO.

DRB-80-3P is a digital kWh meter to register active energy, both imported and exported, with 2 So pulsed outputs for remote monitoring of active and reactive energies on both tariffs. This series of Digital energy meters with LCD display measure active energy in three phase systems in residential, utility and industrial applications.

4 standard module housing, suitable for DIN-rail mounting Connection through CT …/5A up to 10.000/5A or direct connection up to 80A

DRB ENERGY-METER THREE-PHASE 80-3P FEATURES

  • For transformer primary current of 5A to 10.000/5A. Input is in 5A increments
  • 9 digits – 4 display for energy values indication
  • Detection of connection errors (phase transposition and phase missing)
  • Accuracy class 1 for active energy according to EN 50470-3 (B)
  • Operating range current (Ist … Imax) for direct connection 80A = 0.015 … 80A for connection by CT …/5A = 0.003 … 5A
  • Energy register for import and export
  • Sealable terminal covers
  • 4 DIN modules wide (72mm)

DRM Energy-Meters Three-Phase 80-3P Data Sheet

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DRM Energy-Meters Single-Phase 32 -1P

The energy-meters use an LCD display to give a clear reading and are used to measure single-phase systems in residential, utility and industrial applications. Monitoring of the energy-consumption is via two SO pulse outputs. The products can be set up to communicate with Modbus RTU, M-Bus, KNX and SD card datalogger interfaces, and thus can be used to analyse energy-consumption in order to reduce to a minimum the running cost for industrial plants and buildings.

Active energy-meters for single-phase alternating current with a, 7 digits counter. These meters have 1 S0 output generating pulses for remote processing of the active energy measurements for 1 tariff.

DRM ENERGY-METERS SINGLE-PHASE 32-1P FEATURES

  • Display LCD
  • For direct connection 32A and 40A
  • 7 digits for energy and other values indication
  • Accuracy class 1 for active energy and power according to EN 50470-3 (B)
  • Operating range current (Ist … Imax) for direct connection 32A and 40A = 0.020 … 32A or 40A
  • Seal-able terminal covers
  • The standard versions are designed to be combined with the communication module
  • 1 DIN modules wide (18mm)

DRM Energy-Meters Single-Phase 32 -1P Data Sheet

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