DLMS / COSEM Communication Profile Architecture: 3-Layer vs 7-Layer OSI Model
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How DLMS/COSEM Maps onto Communication Stacks
Unlike traditional 7-layer OSI protocols, DLMS/COSEM employs a streamlined Collapsed 3-Layer Architecture for resource-constrained smart meters:
- Application Layer (COSEM - IEC 62056-53/62):
- Object Model (OBIS)
- Association Control Service Element (ACSE - AARQ/AARE)
- xDLMS Messaging (GET, SET, ACTION, Notification)
- Transport / Data Link Layer:
- HDLC (IEC 62056-46) for RS-485 / Optical / Serial
- TCP/UDP Wrapper (IEC 62056-47) for Ethernet / Cellular / Wi-Fi
- 6LoWPAN / IPv6 for G3-PLC / Wi-SUN Mesh
- Physical Layer:
- RS-485, Optical (IEC 62056-21), FSK, OFDM, RF 868/915 MHz
This separation guarantees that COSEM application objects remain 100% identical regardless of whether communication occurs over an optical probe or high-speed fiber!
- Application Layer (COSEM - IEC 62056-53/62):
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From a firmware architecture standpoint, decoupling the COSEM Object Dictionary from the underlying MAC/PHY driver enables 90% code reuse across our entire product line.
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