<![CDATA[DLMS / COSEM Communication Profile Architecture: 3-Layer vs 7-Layer OSI Model]]>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:

  1. Application Layer (COSEM - IEC 62056-53/62):
    • Object Model (OBIS)
    • Association Control Service Element (ACSE - AARQ/AARE)
    • xDLMS Messaging (GET, SET, ACTION, Notification)
  2. 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
  3. 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!

]]>https://dlms.sharur.org/topic/21/dlms-cosem-communication-profile-architecture-3-layer-vs-7-layer-osi-modelRSS for NodeFri, 16 Oct 2026 19:49:50 GMTSat, 22 Aug 2026 12:33:31 GMT60<![CDATA[Reply to DLMS / COSEM Communication Profile Architecture: 3-Layer vs 7-Layer OSI Model on Sat, 22 Aug 2026 12:33:33 GMT]]>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.

]]>https://dlms.sharur.org/post/42https://dlms.sharur.org/post/42Sat, 22 Aug 2026 12:33:33 GMT