Echelon LonWorks Router - Manual (Page 84)

Developing a Router with the FT Router 5000 Chip
To create a L ON W ORKS router with the FT Router 5000, perform the following
steps:
1. Build a router motherboard according to the specifications described in
Chapter 2, LONWORKS Router Electrical Interfaces, and the guidelines
described in Chapter 5, LONWORKS Router Design Issues. The
motherboard can be part of custom application hardware, or can be a
standalone board.
2. Program the serial EEPROM for each router half. The serial EEPROM
holds the router configuration and communications parameters for the
transceiver. See Configuring a Series 5000 Half-Router for more
information about router configuration. You can program the EEPROMs
either before assembly or in-circuit after assembly.
3. Assemble the router, including the two FT Router 5000 half-routers, two
FT-X3 Communications Transformers, and a motherboard.
4. Install the router on a network as described in Chapter 6, Installing a
LONWORKS Router. The network could be a development network for
initial testing, a manufacturing network for configuration during
manufacture, or a production network for field installation.
Figure 38 shows the preferred interconnection between the FT Router 5000 and
the FT-X3 Communications Transformer; the figure also shows the associated
transient protection circuitry. Connect pins 1 and 6 of the FT-X3 transformer to
the FT Router 5000, as shown in the figure.
D5
C3
C6
NETP
NETN
CP4
RXON
TXON
NETB
NETA NETP
NETN
CTS2
CTS1
CTP2
CTP1
C4
Optional RXACTIVE
and TXACTIVE LEDs
D3
D6
D4
C5
NET1
NET2
1
6
2
5
4
7
8
3
34
32
39
38
37
+
+
VR1
FT Router 5000
FT-X3
Communications
Transformer +3.3 V
R1
C1 C2 D1B D2B
D1A D2A
+3.3 V
Figure 38. FT Router 5000 and FT-X3 Interconnections for the TP/FT-10 Network
74 Developing a LONWORKS Router