T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
11
63-4368
Refer to the Light Commercial Building Solution System
Communication Guide form 71-3123 and the E-Bus Wiring
Guidelines, form 74-2865 for a complete description of
network topology rules. Prepare Wiring Diagrams, for wiring
details. Plan to configure each controller. Refer to the Excel
L
ON
S
PEC
™ User Guide, form 74-2937, to configure the
T7350H, XL15 and XL10 Controllers.
Step 1. Plan the System
Plan the use of the T7350H Thermostat according to the job
requirements. Determine the location and functionality of each
device. Verify the sales estimate for the number of other
controllers and devices required. Check the number and type
of other required accessories. When planning the system
layout, consider potential expansion possibilities for future
growth. Planning is very important if HVAC systems and
controllers are to be added in future projects.
Fig. 4. Connecting personal computer to LonWorks
®
bus.
Step 2. Determine Required Network Devices
A maximum of 60 nodes can communicate on a single
L
ON
W
ORKS®
Bus segment. Each L
ON
W
ORKS®
Bus device
comprises one node. If more than 60 nodes are needed, a
Q7751A Router or Q7740 Repeater is necessary. A router or
repeater allows up to 120 controller nodes per network,
divided between two L
ON
W
ORKS®
Bus segments. Please note
that routers are not supported by the LCBS L
ON
S
PEC
™
system configuration tool. Refer to the Light Commercial
Building Solution System Communication Guide form 71-3123
for LCBS details. Refer to the E-Bus Wiring Guidelines, form
74-2865, for a complete description of network topology rules
and maximum wire lengths. A 209541B Termination Module
may be required. Refer to the Excel 10 FTT Termination
Module Installation Instructions form, 95-7554.
Step 3. Layout Communications and Power
Wiring:
L
ON
W
ORKS®
Bus Layout
The communications L
ON
W
ORKS®
Bus, is a 78-kilobit network
that uses transformer isolation and differential Manchester
encoding. The Free Topology Transceiver (FTT) L
ON
W
ORKS®
communications Bus supports a polarity insensitive, free
topology wiring scheme, refer to the E-Bus Wiring Guidelines
form, 74-2865, for a complete description of L
ON
W
ORKS®
network topology rules. Fig. 5 shows T7350H devices
connected in a typical free topology L
ON
W
ORKS®
network.
Fig. 5. Typical topology for T7350 devices in L
ON
W
ORKS®
network.
M22492
NOTEBOOK PC
RS-232
SERIAL
PORT
Q7760
SLTA
CABLE
PART
NO. 205979
SHIELDED
INTERFACE
CABLE
T7350H
LonWorks
BUS PORT
NOTEBOOK PC
RS-232
SLTA
SLTA
SLTA
RS-232
RS-232
T7350H
MODEM
MODEM
MODEM
M22493
LonWorks BUS
LonWorks BUS
LonWorks BUS
T7770
WITH NO
LonWorks
BUS ACCESS
T7770
JACK FOR OPERATOR TERMINAL
LonWorks BUS
I/O CONNECTIONS
T7350H
T7350H
T7350H
T7350H
T7350H
T7350H
T7350H
T7350H
