This article may be too technical for most readers to understand.(March 2013)
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.
- 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)