FTT-10A Free Topology Twisted Pair Transceiver Model 50051 Features Complete LonWorks transformer-isolated , free topology communication transceiver Re place m e nt for th e F T T-1 0 tra nsceive r1 Compatible with th e F T T-1 0 Fre e Topology Tra nsceive r a n d LPT-1 0 Link Powe r Transceiver Diffe re ntial M a nch este r co de d signaling for pola rit y inse nsitive n et work wiring 78 kilobit s pe r se con d bit rate up to dista nces of 5 0 0 m ete rs (f re e topology), or 270 0 m ete rs (do ubly te rminate d bus) worst c ase Suppor t s f re e topology sta r, bus , a n d loop wiring Automatic clock d ete c tion at 5 , 1 0, or 20 M Hz D esign e d to com ply with FCC a n d EN 5 5 02 2 Level B EM I re quire m e nt s U L , C SA , T V Re cognize d com pon e nt Lon M ark ce r tifia ble for inte rope ra bilit y Description The FTT-10A Free Topology Twisted Pair Transceiver provides a simple, cost-effective method of adding a LonWorks transceiver to any Neuron Chip-based control system. A replacement for the popular FTT-10 transceiver1, the FTT-10A transceiver supports polarity insensitive, free topology wiring, freeing the system installer from the need to wire using a bus topology. Star, bus, and loop wiring are all supported by this architecture. Free topology wiring reduces the time and expense of system installation by allowing the wiring to be installed in the most expeditious manner. It also simplifies network expansion by eliminating restrictions on wire routing, splicing, and node placement. The FTT-10A transceiver consists of an isolation transformer that is integrated with a 78kbps differential Manchester coded communication transceiver. Pins are provided for connection to the Neuron Chip Communications Port (CP) and clock lines, +5V power, and the twisted pair network. The pins are keyed to prevent accidental reversal during mounting. The FTT- 10A transceiver provides automatic detection of the input clock frequency at 5, 10, and 20MHz. The transceiver is housed in an encapsulated plastic shell which contains the transformer and signal processing electronics. The compact package is only 7.2mm (0.28 inches) high and is ideal for use in very low profile applications such as DIN packs. The sealed housing protects the transceiver should conformal coating or other forms of environmental sealing be required on the printed circuit assembly. www.echelon.com The FTT-10A transceiver is compatible with Echelon offers a comprehensive range of using the FTT-10A transceiver. Technical Echelons LPT-10 Link Power Transceiver, development tools, network interfaces, support for the transceiver is available and these transceivers can communicate routers, and network services tools to through Echelons LonSupport Premier with each other on a single twisted simplify the task of designing products technical assistance program. pair cable. This capability provides an inexpensive means of interfacing to nodes Typical Free Topologies Supported by the whose current or voltage requirements FTT-10A Free Topology Transceiver would otherwise exceed the capacity of the link power segment. When equipped with an FTT-10A transceiver, these nodes can be operated from a local power supply without the need for additional electrical isolation from the link power network. The FTT-10A transceiver also provides electrical isolation for I/O devices that are grounded, allowing such devices to be used on a link power network segment. Each segment of a link power network utilizes a non-isolated design with a single ground point at the LPI-10 Link Power Interface. Proper operation requires that the integrity of a single point ground be maintained throughout the segment, including I/O devices that are connected to a Neuron Chip. In many applications, I/O devices are grounded to meet either functional requirements or safety regulations. The transformer of the FTT-10A transceiver electrically isolates the node from the segment, allowing devices connected to the node to be grounded without impairing communications. A twisted pair channel may be comprised of multiple segments separated by physical layer repeaters. A physical layer repeater permits a twisted pair network to grow inexpensively to encompass many more nodes or longer wire distances than would otherwise be possible. The FTT-10A transceiver includes a physical layer repeater feature that allows LonTalk data to be exchanged between network segments by interconnecting two or more FTT-10A transceivers FTT-10A-to- LPT-10 physical layer repeaters require the addition of an external logic circuit. If the Free Topology Channel Illustrating FTT-10A and LPT-10 Transceiver repeater includes an LPT-10 transceiver, Compatibility & Network ExpansionUsing Physical Layer Repeaters then the internal power supply of the LPT-10 transceiver can power the FTT-10A transceiver. Using the FTT-10A transceiver can save thousands of hours of development time compared with a custom-designed transceiver. The transceiver is designed to comply with both FCC and EN55022 EMI requirements, minimizing time consuming and expensive testing. As a UL, CSA, and TV Recognized component, the FTT-10A transceiver can be integrated into a product with minimal additional safety testing. The transceiver is small enough to fit into virtually any application, and is economically priced for OEM applications of any volume.