Emerson E2 - Maximum Number of Echelon Devices; Device Termination

Figure 8-1 - Echelon Wiring - Subnets
E2
E2
E226513125rev
RECOMMENDED
UNBROKEN
CHAIN
Figure 8-2 - Echelon Wiring, pt. 2
E2s
E226513131rev
8-2 • E2 RX/BX/CX I&O Manual 026-1614 Rev 4 5-JAN-2013
8.3.1 Maximum Number of
Echelon Devices
A daisy-chained segment may contain no more than 63
total Echelon devices (also called "nodes"). If there are 64
or more Echelon devices at your site, an Echelon-compati-
ble router (P/N 572
-4200) will be required. A router
placed on the Echelon Network allows you to add another
63-node daisy-chain network. For larger installations,
multiple routers can be used to extend the network indefi-
nitely.
More information about routers and how they are used
in
a daisy-chain Echelon Network can be found in the
Router and Repeater Installation Guide (P/N 026-1605).
8.4 Device Termination
In a daisy-chain configuration, both ends of the net-
work segment must be terminated. T
erminate the E2 by
setting jumper J2 to the UP position, as shown in Figure
8-3. Other devices on the Echelon Network are terminated
either by jumpers on the control board or by connecting a
10
2-ohm “terminator block” at the end of the network seg-
ment (see Section 8.4.1, Usin
g a Termination Block (P/N
535-2715) to Terminate a Daisy Chain). Refer to the
installation guide references at the end of this section for
specific devi
ce termination instructions.
All other E2s and Echelon device
s that aren’t at the
end of a daisy-chained network segment must be untermi-
nated.
If a router or repeater is being
used in a network, termi-
nation becomes more complicated, becaus
e routers and
repeaters join multiple daisy-chain segments together.
Refer to the Router and Repeater Installation Guide (P/N
026-1605), for specific termination instructions.
Figure 8-3 - E2 Termination - Daisy Chain
J2
J2
E2
Termination