SDS Protocol

Smart Distributed System (SDS) protocol was developed by Honeywell and is supported by Holjeron. SDS is an open event-driven protocol used over Controller area network based industrial networks. It is used for a highly reliable Smart device-level network. The SDS Application Layer Protocol is optimized for smart sensors and actuators, where configuration, diagnostic, and process information can be embedded cost-effectively in a very small footprint.

Key features
  • Supports communication rates up to 1 Mbit/s.
  • 1500 ft maximum distance at 125 kbit/s (longer with Bridge).
  • Can support 64 maximum electrical loads (Nodes) per network without repeater & 126 with repeater.
  • Uses 12-24VDC, 2 power wires + 2 communication wires + shield
  • Multiple physical layer topologies
  • Can have 126 logical addresses (logical devices) - not related to physical location on the network
  • Each logical device can have 32 objects containing attributes, actions and events
  • Proven event driven architecture for maximum throughput (<1ms)
  • Event-Driven, Master-Slave, Multicast and Peer-to-peer Services
  • Network heartbeat to ensure device health every 2.5 seconds
  • Have Robust Network Management capabilities (Microsoft architecture)
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