Step 1. Plan the System. Honeywell T7350

T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT

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.

NOTEBOOK PC

RS-232

SERIAL

PORT

Q7760

SLTA

SHIELDED

INTERFACE

CABLE

CABLE

PART

NO. 205979

T7350H

LonWorks

BUS PORT

M22492

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.

NOTEBOOK PC

T7350H T7350H T7350H T7350H T7770

WITH NO

LonWorks

BUS ACCESS

RS-232

SLTA

MODEM

T7350H

LonWorks BUS

T7350H

MODEM

T7350H

RS-232

SLTA

T7350H

LonWorks BUS

T7350H

MODEM

RS-232

SLTA

LonWorks BUS

T7770

LonWorks BUS

I/O CONNECTIONS JACK FOR OPERATOR TERMINAL

Fig. 5. Typical topology for T7350 devices in L

ON

W

ORKS®

network.

11

M22493

63-4368