Honeywell W7750A User Manual
EXCEL 10 W7750A,B,C CONSTANT VOLUME AHU CONTROLLER
74-2958—1
30
Each L
ON
W
ORKS
Bus segment is set up with two unused
nodes to allow for a CARE/E-Vision operator terminal to be
connected to the L
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 segment
configuration rules.
Table 7. L
ON
W
ORKS
® Bus Configuration Rules And Device Node Numbers.
Refer to the L
ON
W
ORKS
Bus Wiring Guidelines form, 74-2865
for complete description of network topology rules and the
maximum wire length limitations. If longer runs are required, a
Q7740A 2-Way or Q7740B 4-Way Repeater can be added to
extend the length of the L
maximum wire length limitations. If longer runs are required, a
Q7740A 2-Way or Q7740B 4-Way Repeater can be added to
extend the length of the L
ON
W
ORKS
Bus. A Q7751A,B Router
can be added to partition the system into two segments and
effectively double the length of the L
effectively double the length of the L
ON
W
ORKS
Bus. Only one
router is allowed with each Excel 10 Zone Manager, and each
network segment can have a maximum of one repeater.
network segment can have a maximum of one repeater.
In addition, all L
ON
W
ORKS
Bus segments require the
installation of a 209541B Termination Module for a singly
terminated L
terminated L
ON
W
ORKS
Bus or two 209541B Termination
Modules for a doubly terminated L
ON
W
ORKS
Bus. For more
details on L
ON
W
ORKS
Bus termination, refer to the L
ON
W
ORKS
Bus Wiring Guidelines form, 74-2865, or see Application Step
3. Lay Out Communications and Power Wiring, and the
L
3. Lay Out Communications and Power Wiring, and the
L
ON
W
ORKS
Bus Termination Module subsection in Application
Step 4.
Step 3. Lay Out Communications and Power
Wiring
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 encoding. Approved cable types for
L
differential Manchester encoding. Approved cable types for
L
ON
W
ORKS
Bus communications wiring 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
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
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
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 polarity insensitive, free topology wiring scheme
that supports T-tap, star, loop, and mixed bus wiring.
that supports T-tap, star, loop, and mixed bus wiring.
L
ON
W
ORKS
Bus networks can be configured in a variety of
ways, so refer to the L
ON
W
ORKS
Bus Wiring Guidelines form,
74-2865 for complete description of network topology rules
and Table 7. Fig. 19 and 20 depict two typical L
and Table 7. Fig. 19 and 20 depict two typical L
ON
W
ORKS
Bus
network topologies; One has only one doubly terminated
L
L
ON
W
ORKS
Bus segment that has 60 nodes or less, and one
showing two singly terminated L
ON
W
ORKS
Bus segments that
has 120 nodes or less (60 MAX per each segment). The bus
configuration is set up using the Network Manager tool from
within CARE (see the CARE Excel 10 Zone Manager User’s
Guide, form 74-1392).
configuration is set up using the Network Manager tool from
within CARE (see the CARE Excel 10 Zone Manager User’s
Guide, form 74-1392).
NOTE:
For wiring details see the L
ON
W
ORKS
Bus
Termination Module subsection in Step 4. For wall
module wiring, U.S. part AK3782 (non-plenum) or
U.S. part AK3792 (plenum) can be used. For a
L
module wiring, 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 doubly terminated daisy-
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.
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 Manager 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 Manager 1 node
One Q7751A,B Router 2 nodes (1 in each Bus Segment)
Ports for operator terminal access (two CARE/E-Vision
terminals)
2 nodes (1 in each Bus Segment)
Maximum number of Excel 10s in segment number one 60 nodes
Maximum number of Excel 10s in segment number two 60 nodes
Total 125 nodes