Engenuity Systems EXM-LTNI EXM to LonTalk Network Interface Module

The Engenuity Systems EXM-LTNI is a network interface module that bridges EXM systems with LonTalk networks, enabling bidirectional communication and device interoperability in building automation and control applications. Built around the Neuron® 3150® Chip, the module facilitates seamless data exchange between diverse control platforms operating on the LonTalk protocol. ## Technical Specifications • Processor Core: Neuron® 3150® Chip • Memory: 32 KB re-programmable flash memory; 32 KB RAM • Clock Speed: 10 MHz crystal oscillator • Firmware: Standard Neuron Chip firmware with extensions for automatic transceiver parameter configuration, packet transmission signal output, and manual device recovery • Microprocessor Interface (MIP): Supports memory-mapped I/O or 8-bit parallel data bus with three control lines and optional up-link interrupt; enables asynchronous updates from up to 4,096 network variable connections • Transceiver Support: Compatible with standard LONWORKS transceivers; transceiver type selection via five ID pins • Network Activity Output: Packet send output pin asserts low for approximately 40 ms when a packet is transmitted from network to MAC processor • Additional Outputs: Two supplementary bit outputs - one dedicated to packet send indication, one configurable as general-purpose output or up-link data interrupt request ## Key Features • Miniature circuit card form factor for compact integration • Manual device recovery capability via service and reset input sequencing for reloading defective application software • LNS (LONWORKS Network Services) architecture compatibility for integration with compliant management tools • Flexible host processor interface supporting legacy and memory-mapped architectures ## Typical Applications Building automation systems requiring interoperability between EXM control platforms and LonTalk-based field devices and sensors. ## Compatibility & Integration The module connects directly to EXM systems and LonTalk networks via dedicated connectors for host interface, network interface, power input, application I/O, and transceiver connection. MIP functionality enables operation as either a standalone applications processor or as a network interface for external host processors.