Honeywell EXCEL 10 W7752D - Manual (Page 20)

EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE
EN2B-0285GE51 R0909 18
Step 3. Lay Out Communications and Power
Wiring
L
ON
W
ORKS
Layout
The communications bus, L ON W ORKS , is a 78-kilobit serial link
that uses transformer isolation and differential Manchester
encoding. Wire the L ON W ORKS using wires with specifications
set forth in Table 10. An FTT L ON W ORKS can be wired in
daisy chain, star, loop or any combination thereof as long as
the max. wire length requirements given in Step 2 are met.
NOTE: Due to the transformer isolation, the bus wiring does
not have a polarity; that is, it is not important which
of the two L ON W ORKS terminals are connected to
each wire of the twisted pair.
L ON W ORKS networks can be configured in a variety of ways,
but the rules listed in Table 9 always apply. Fig. 13 and Fig.
14 depict two typical daisy chain L ON W ORKS network layouts;
one as a single bus segment that has 60 nodes or less, and
one showing two segments. Fig. 15 shows examples of free
topology bus layouts. The bus configuration is set up using
the Network Manager tool.
Excel 10 W7752
FCU Controller
Excel 10 W7754
FCU Controller
Excel 5000
Honeywell
D-71101 Schönaich Made in Germany
12
10 11 12 9
Honeywell
te
rmi
nati
on
module
Fig. 13. L ON W ORKS wiring layout for one daisy-chain network segment
Excel 10 W7752
FCU Controller
Excel 10 W7754
FCU Controller
Excel 5000
Honeywell
D-71101 Schönaich Made in Germany
12
10 11 12 9
Honeywell
Excel 10 W7752
FCU Controller
Excel 10 W7754
FCU Controller
Honeywell
D-71101 Schönaich Made in Germany
12
10 11 12 9
Honeywell
max. 60 nodes
max. 60 nodes
termination
mo
dule
ter
m
ination
module
ter
m
ination
module
LonWorks
router
Fig. 14. L ON W ORKS wiring layout for two daisy-chain network segments