EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—130
Each L
ON
W
ORKS
Bus se
ment is set up with two unused
nodes to allow for a CARE/E-Vision operator terminal to be
connected to the L
ON
W
ORKS
Bus. Multiple CARE/E-Vision
terminals can be connected to the L
ON
W
ORKS
Bus at the
same time. Table 7 summarizes the L
ON
W
ORKS
Bus se
ment
confi
uration rules.
Table 7. L
ON
W
ORKS
®
Bus Configuration Rules And Device Node Numbers.
Refer to the L
ON
W
ORKS
Bus Wirin
Guidelines form, 74-2865
for complete description of network topolo
rules and the
maximum wire len
th limitations. If lon
er runs are re
uired, a
Q7740A 2-Wa
or Q7740B 4-Wa
Repeater can be added to
extend the len
th of the L
ON
W
ORKS
Bus. A Q7751A,B Router
can be added to partition the s
stem into two se
ments and
effectivel
double the len
th of the L
ON
W
ORKS
Bus. Onl
one
router is allowed with each Excel 10 Zone Mana
er, and each
network se
ment can have a maximum of one repeater.
In addition, all L
ON
W
ORKS
Bus se
ments re
uire the
installation of a 209541B Termination Module for a sin
l
terminated L
ON
W
ORKS
Bus or two 209541B Termination
Modules for a doubl
terminated L
ON
W
ORKS
Bus. For more
details on L
ON
W
ORKS
Bus termination, refer to the L
ON
W
ORKS
Bus Wirin
Guidelines form, 74-2865, or see Application Step
3. La
Out Communications and Power Wirin
, and the
L
ON
W
ORKS
Bus Termination Module subsection in Application
Step 4.
Step 3. Lay Out Communications and Power
Wiring
L
ON
W
ORKS
®
Bus Layout
The communications bus, L
ON
W
ORKS
Bus, is a 78-kilobits per
second
kbps
serial link that uses transformer isolation and
differential Manchester encodin
. Approved cable t
pes for
L
ON
W
ORKS
Bus communications wirin
is Level IV 22 AWG
0.34 mm
2
plenum or non-plenum rated unshielded, twisted
pair, solid conductor wire. For nonplenum areas, use Level IV
22 AWG
0.325 mm
2
, such as U.S. part AK3781
one pair
or
U.S. part AK3782
two pair
. In plenum areas, use plenum-
rated Level IV, 22 AWG
0.325 mm
2
such as U.S. part
AK3791
one pair
or U.S. part AK3792
two pair
. See Tables
9 and 11 for part numbers. Contact Echelon Corp. Technical
Support for the recommended vendors of Echelon approved
cables. The FTT communications bus, L
ON
W
ORKS
Bus,
supports a polarit
insensitive, free topolo
wirin
scheme
that supports T-tap, star, loop, and mixed bus wirin
.
L
ON
W
ORKS
Bus networks can be confi
ured in a variet
of
wa
s, so refer to the L
ON
W
ORKS
Bus Wirin
Guidelines form,
74-2865 for complete description of network topolo
rules
and Table 7. Fi
. 19 and 20 depict two t
pical L
ON
W
ORKS
Bus
network topolo
ies; One has onl
one doubl
terminated
L
ON
W
ORKS
Bus se
ment that has 60 nodes or less, and one
showin
two sin
l
terminated L
ON
W
ORKS
Bus se
ments that
has 120 nodes or less
60 MAX per each se
ment
. The bus
confi
uration is set up usin
the Network Mana
er tool from
within CARE
see the CARE Excel 10 Zone Mana
er User’s
Guide, form 74-1392
.
NOTE: For wirin
details see the L
ON
W
ORKS
Bus
Termination Module subsection in Step 4. For wall
module wirin
, U.S. part AK3782
non-plenum
or
U.S. part AK3792
plenum
can be used. For a
L
ON
W
ORKS
Bus that is a doubl
terminated dais
-
chain, these cables contain two twisted pairs
one for
the run down to the wall module, and one for the run
back up to the controller
for ease of installation.
One L
ON
W
ORKS
Bus Segment Example Maximum Number of Nodes Equals 62
One Q7750A Excel 10 Zone Mana
er 1 node
Port for operator terminal access
CARE/E-Vision
1 node
Maximum number of Excel 10s 60 nodes
Total
62
nodes
Two L
ON
W
ORKS
Bus Segments Example Maximum Number of Nodes Equals 125
One Q7750A Excel 10 Zone Mana
er 1 node
One Q7751A,B Router 2 nodes
1 in each Bus Se
ment
Ports for operator terminal access
two CARE/E-Vision
terminals
2 nodes
1 in each Bus Se
ment
Maximum number of Excel 10s in se
ment number one 60 nodes
Maximum number of Excel 10s in se
ment number two 60 nodes
Total
125
nodes
