FTT-10A Free Topology Twisted Pair Transceiver
Model 50051 and 50051R
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Complete L
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transformer-isolated, free
topology communication transceiver
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Replacement for the FTT-10 transceiver
1
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Compatible with the FTT-10 Free Topology Transceiver
and LPT-10 Link Power Transceiver;
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Differential Manchester coded signaling for polarity
insensitive network wiring
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78 kilobits per second bit rate up to distances of 500
meters (free topology), or 2700 meters (doubly terminat-
ed bus) worst case
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Supports free topology star, bus, and loop wiring
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Automatic clock detection at 5, 10, or 20MHz
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Designed to comply with FCC and EN55022 Level B
EMI requirements
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UL, CSA, TÜV Recognized component
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certifiable for interoperability
Description
The FTT-10A Free Topology Twisted Pair Transceiver
provides a simple, cost-effective method of adding a
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transceiver to any Neuron
®
Chip-based control
system. A replacement for the popular FTT-10 transceiver
1
,
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 trans-
former that is integrated with a 78kbps differential Manchester
coded communication transceiver. Pins are provided for con-
nection 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 electron-
ics. 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.
The FTT-10A transceiver is compatible with Echelon's
LPT-10 Link Power Transceiver, and these transceivers can
communicate with each other on a single twisted pair cable.
This capability provides an inexpensive means of interfacing to
nodes whose current or voltage requirements 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 addi-
tional electrical isolation from the link power network.
Model 50051R complies with the European Directive
2002/95/EC on the restriction of the use of certain hazardous
substances (RoHS) in electrical and electronic equipment.
Model 50051 is the old leaded version of FTT-10A Free
Topology Twisted Pair Transceivers.
Typical Free Topologies Supported by the FTT-10A Free Topology Transceiver
Free Topology Channel Illustrating FTT-10A and LPT-10 Transceiver Compatibility & Network Expansion
Using Physical Layer Repeaters
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 impair-
ing communications.
A twisted pair channel may be comprised of multiple seg-
ments 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 intercon-
necting two or more FTT-10A transceivers; FTT-10A-to-LPT-
10 physical layer repeaters require the addition of an external
logic circuit. If the repeater includes an LPT-10 transceiver,
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 trans-
ceiver. The transceiver is designed to comply with both FCC
and EN55022 EMI requirements, minimizing time consuming
and expensive testing. As a UL, CSA, and TÜV 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.
Echelon offers a comprehensive range of development
tools, network interfaces, routers, and network services tools to
simplify the task of designing products using the FTT-10A
transceiver. Technical support for the transceiver is available
through Echelon's LonSupport™ Premier technical assistance
program.
Specifications
Function
Data Communications Type
Network Polarity
Isolation Between Network and
0-60Hz, 60 seconds
0-60Hz, continuous
Input Supply Voltage
Supply Current:
Transmit mode
EMI
ESD
Radiated Electromagnetic Susceptibility
Fast Transient/Burst Immunity
Surge Immunity
Listings
Clock Rates
Transmission Speed
Number of Transceivers Per Segment
number of LPT-10 transceivers
Network Wiring
Network Length in Free Topology
3
Free topology, transformer-isolated twisted pair transceiver
Differential Manchester codin
Polarity insensitive
1000Vrms
277Vrms
2
+5VDC ±5%
Receive mode
5mA maximum
20mA maximum
Designed to comply with FCC Part 15 Level B and EN55022 Level B
Designed to comply with IEC1000-4-2, Level 4
Designed to comply with IEC1000-4-3, Level 3
Designed to comply with IEC1000-4-4, Level 4
Designed to comply with IEC1000-4-5, Level 3
UL 1950, CSA C22.2 No. 950, TÜV EN60950
Automatically detects 5, 10, or 20MHz input clock supplied by Neuron Chip
78 kilobits per second
Up to 64
22 to 16AWG twisted pair; see User's Guide for qualified cable types
1000m (3,280 feet) maximum total wire with one repeater
500m (1,640 feet) maximum total wire with no repeaters
500m (1,640 feet) maximum node-to-node distance
Network Length in Doubly-Terminated
Bus Topology
3
5400m (17,710 feet) with one repeater
2700m (8,850 feet) with no repeaters
Maximum Stub Length in Doubly-Terminated
Bus Topology
3m (9.8 feet)
Network Termination
One terminator in free topology; two terminators in bus topology (see User's Guide)
Power-down Network Protection
High impedance when unpowered
Physical Layer Repeater
Two-way repeater requires two FTT-10A transceivers and clock oscillator plus external power source
OR one
FTT-10A transceiver, one LPT-10 transceiver, control circuitry, and clock oscillator.
Operating Temperature
-40 to +85°C
Operating Humidity
25-90% RH @ 50°C, non-condensing
Non-operating Humidity
95% RH @ 50°C, non-condensing
Approximate Dimensions
17.8mm L x 7.2mm H x 13.7mm W
(0.70" x 0.28" x 0.54")
Packaging
Encapsulated plastic shell
Ordering Information
Product
FTT-10A Free Topology Transceiver
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FTT-10A Free Topology Transceiver User‘s Guide
(order separately–not shipped with product)
Notes:
Echelon Model Number
50051 (non RoHS compliant), 50051R (RoHS compliant)
078-0156-01
1
The FTT-10A transceiver is a replacement for the FTT-10 transceiver for all published applications except repeaters - see the L
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FTT-10A Free Topology Transceiver User's Guide for details. The FTT-10A transceiver does not
2
Safety agency hazardous voltage barrier requirements are not supported.
support 1.25MHz or 2.5MHz Neuron Chip clock operation. Some PC board modification may be required due to mechanical differences between the FTT-10 and FTT-10A transceivers. See the individual user’s guides for details.
3
Network segment length varies depending on wire type. See the L
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FTT-10A Free Topology Transceiver User's Guide for detailed specifications.
Copyright © 2001-2005, Echelon Corporation. Echelon, LON, L
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, L
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M
ARK
, LonBuilder, NodeBuilder, LonManager, LonTalk, LonUsers, LonPoint, Digital Home, Neuron, 3120, 3150, LNS,
i.LON,
L
ON
W
ORLD
, ShortStack,
Panoramix, LonMaker, the Echelon logo, and the LonUsers logo are trademarks of Echelon Corporation registered in the United States and other countries. Pyxos, LonLink, LonResponse, LonSupport, LONews, Open Systems Alliance,
OpenLDV, Powered by Echelon, LNS Powered by Echelon, Panoramix Powered by Echelon, L
ON
W
ORKS
Powered by Echelon, Networked Energy Services Powered by Echelon, NES Powered by Echelon, and Thinking Inside the Box are
trademarks of Echelon Corporation. Other trademarks belong to their respective holders.
Disclaimer
Free Topology Twisted Pair Transceiver Modules and other OEM Products were not designed for use in equipment or systems which involve danger to human health or safety or a risk of property damage and Echelon assumes no
responsibility or liability for use of the Neuron Chips or Free Topology Twisted Pair Transceiver Modules in such applications. ECHELON MAKES AND YOU RECEIVE NO WARRANTIES OR CONDITIONS, EXPRESS, IMPLIED, STATU-
TORY OR IN ANY COMMUNICATION WITH YOU, AND ECHELON SPECIFICALLY DISCLAIMS ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
003-0312-01B
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