Intelligent solutions for IoT, utilities and streetlight professionals

AmsRS485 (DLMS/COSEM+Modbus)

  • RS485 Smart Meter Interface Module for DLMS/COSEM and Modbus

    The AmsRS485 module is a client interface module in the Amplex Module System. It is designed for two-way communication with RS485 compatible equipment from various manufacturers.

    The AmsRS485 module can be used for establishing communication with RS485 compatible utility meters like DLMS meters or industrial monitoring devices running, for example, Modbus. The AmsRS485 module can easily be connected with up to ten child devices. The AmsRS485 module collects readings and other data from the devices and subsequently transfers these data to an AmsCPU/AmsCPU-IO module that acts as a data concentrator and WAN module. The AmsCPU/AmsCPU-IO module delivers the data to the central server when required. Direct communication and power supply between the AmsRS485 module and the AmsCPU/AmsCPU-IO module are handled by an incorporated A-Bus interface, which is based on the industrially proven RS-485 technology.


    • A-Bus two-way communication with A-Bus masters, e.g. AmsCPU, AmsCPU-IO
    • According to ANSI TIA/EIA-485-A, half duplex
      The module supports the following protocols: General purpose serial communication, dlms mode C, dlms/COSEM (HDLC), Modbus
    • The module is automatically discovered by the AmsCPU module. In case a module is disconnected from the AmsCPU module, this is reported to the server application and the module is listed as missing. If the module is reconnected to the AmsCPU module or another AmsCPU module, it will be rediscovered by the system.
    • The real-time clock is automatically synchronized with the AmsCPU module which in turn is synchronized with the Network Time Protocol (NTP).
    • AMS Status LED (green): indicates whether the A-Bus is up and running.
    • The software on the AmsRS485 module can be updated remotely from the central server.
    • New software is transferred without interrupting the normal functionality of the AmsRS485 module. When the software has been transferred, the integrity of the software is checked and the software is installed.
    • A built-in self-test (BIST) is performed after power-up.
    • Watchdog and brown-out reset ensure that the system is up and running at all times.

    • A-Bus client module
    • RS485 A and RS485 B connect to one meter or a collection of meters. A = inverting pin and B = non-inverting pin.
      The AmsRS485 module can be connected to a maximum of 10 meters.


Supported Meters


Manufacturer Model Protocol Interface
Elster Germany AS253 DLMS/COSEM AMS RS485
Elster Germany AS1253 DLMS/COSEM AMS RS485
Elster Germany AS1440 DLMS/COSEM AMS RS485
Elster US A1800 DLMS/COSEM AMS RS485
Actaris ACE6000 DLMS/COSEM AMS RS485
Actaris ACE7000 DLMS/COSEM AMS RS485
Iskraemeco MT831 IEC62056-21 AMS RS485
Kamstrup 162J DLMS/Cosem AMS RS485
Kamstrup 351B/C Kamstrup Meter Protocol, DLMS/COSEM Optical, AMS RS485
Kamstrup 382J Kamstrup Meter Protocol, DLMS/COSEM Optical, AMS RS485
Larsen & Toubro ER300P Modbus AMS RS485, AMS CPU-IO
Larsen & Toubro Nova Modbus AMS RS485, AMS CPU-IO
Larsen & Toubro Quasar Modbus AMS RS485, AMS CPU-IO
Landis+Gyr E650 DLMS/COSEM AMS RS485
Carlo Gavazzi EM24DIN Modbus AMS RS485, AMS Sense, AMS wMBus, AMS CPU-IO
Carlo Gavazzi EM21 Modbus AMS RS485, AMS Sense, AMS wMBus, AMS CPU-IO
Carlo Gavazzi EM21-72R Modbus AMS RS485, AMS Sense, AMS wMBus, AMS CPU-IO
Carlo Gavazzi EM21-72D Modbus AMS RS485, AMS Sense, AMS wMBus, AMS CPU-IO
Circutor CVM-NET Modbus AMS RS485, AMS CPU-IO
DEIF AGC3 Modbus AMS RS485, AMS CPU-IO
DEIF MIB7000 Modbus AMS RS485, AMS CPU-IO
DEIF MIC2 Modbus AMS RS485, AMS CPU-IO
DEIF AMP380 Modbus (via ext interface) AMS RS485, AMS CPU-IO
ZheLiang Yongtailong Electric DDS-1Y Modbus AMS RS485, AMS CPU-IO
Manufacturer Model Protocol Interface
Manufacturer Model Protocol Interface
Manufacturer Model Protocol Interface
Manufacturer Model Protocol Interface
Danfoss ECL 210/310 Modbus AMS RS485, AMS CPU-IO
Grundfos Magna 3 Modbus AMS RS485, AMS CPU-IO

More meters can be supported using add-on AMS modules – see full list of supported meters, interfaces and protocols here.

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