As the communication module chooses the right mode automatically, it is not necessary to change the modus over the communication protocol. The switching process is managed by the interface between Gas meter and communication module (ACM Interface). Switching between MBus and SCR/SCR+ Mode The external communication module, which is mounted to the Gas Meter, can switch between MBus and SCR/SCR+ Mode every time. With the help of the Elster Multiprotocol the Gas Meter becomes flexible, because all Elster Communication Modules can be directly connected to the meter or changed in field without adjusting the settings of the meter (Smart Ready).

Which modus is activated, is decided automatically in the field by assembly of the suitable communication module. Introduction Switching between MBus and SCR/SCR+ Mode Modus MBus according to OMS Data Link Layer SND_NKE REQ_UD REQ_UD SND_UD RSP_UD Application Layer Supported CI Fields Short Data Header Long Data Header Fixed Data Header Error Status Codes Version field Variable Data Blocks Ownership Number Volume, converted Volume, unconverted Actuality Duration Procedures SND_UD Set Baud Rate SND_UD Application Reset SND_UD Slave Select RSP_UD Standard Data Record Modus SCR/ SCR+ with OBIS numbers according to OMS Reading the meter Answer of the meter DC Meter Interface with synchronous transmission Power Clock Echo Burst Example Synchronous Link Interface Short protocol for Synchronous Link Annex A Examples (Mode MBus according to OMS) Author / Herausgeber: Mod.Report / Änd.Nr.: ZSD C Page / Seite: 2 / 26ģ Elster Multiprotocol AE03:05.01: Introduction The Elster Multiprotocol unites two communication protocols (MBus according to OMS and SCR/SCR+ in accordance with IEC, formerly IEC 1107) to one protocol. 1 Elster Multiprotocol AE03:05.01:01.01 Elster Multiprotocol AE03:05.01:01.01 Author / Herausgeber: Mod.Report / Änd.Nr.: ZSD C Page / Seite: 1 / 26Ģ Elster Multiprotocol AE03:05.01:01.01 Contents 1.

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