Echelon LonWorks Router - Manual (Page 70)

initial testing, a manufacturing network for configuration during
manufacture, or a production network for field installation.
The following sections describe how to connect the Router 5000 to various
transceiver types. After these descriptions is a set of example schematics for a
simple TP/XF-1250 to EIA-485 twisted pair router.
Using an External Transceiver with the Router 5000
You can develop a Router 5000 half-router using any of the following transceiver
types:
• Echelon TPT Twisted Pair Transceiver Module for a TP/XF-1250 channel
• EIA-485 transceiver for various channel types
• Echelon FTT-10A Free Topology Twisted Pair Transceiver for a TP/FT-10
channel
• Echelon L ON W ORKS LPT-11 Link Power Twisted Pair Transceiver for a
78 kbps link-power channel
The following sections describe the basic electrical connections for each of these
transceiver types.
You can also connect a Router 5000 half-router to a Series 3100 half-router for
other transceiver and channel types, for example, a PL-20 channel. See
Connecting Half-Routers: Series 5000 and Series 3100 for more information.
Using a TP/XF-1250 Transceiver
You can use a Router 5000 with an Echelon TPT Twisted Pair Transceiver
Module for a TP/XF-1250 channel. However, because the Router 5000 does not
include an on-chip differential transceiver, you must:
• Select “TP/XF-1250” as the transceiver type within the Hardware
Template Editor of the NodeBuilder FX Development Tool or the Mini FX
Evaluation Kit. Within this template, select “Neuron 5000” as the
Neuron Chip Model. Using the TP/XF-1250 template causes the Neuron
firmware to configure the Neuron 5000 Processor’s communications port
to operate in 3.3 V single-ended mode.
Important: Select a clock multiplier of at least 2 (to use a 20 or 40 MHz
system clock). However, if the other router-half uses a Series 3100 chip,
do not specify a value higher clock multiplier value than 2. You can
specify a value of 4 if both sides are Router 5000 chips. Do not specify a
value of 8.
• Add a single-ended mode to differential mode converter circuit, as
described in Differential Driver Circuit, and a differential comparator
circuit as described in Comparator Circuit. These circuits convert the
Router 5000’s 3.3 V single-ended mode signals to the 5 V differential
mode signals required for the TPT/XF-1250 transceiver.
Figure 30 shows the basic configuration for connecting a Router 5000 to a
TPT/XF-1250 transceiver.
60 Developing a LONWORKS Router