Honeywell commercial programmable t7350 Manuel D’Utilisation

7

63-4368

The T7350H provides networking capability in a L

ON

W

ORKS®

 

system using a Free Topology Transceiver (FTT) transformer-

coupled communications port running at 78 kilobits per 

second (kbs). The transformer-coupled communications 

interface offers a much higher degree of common-mode noise 

rejection while ensuring dc isolation. L

ON

W

ORKS®

 FTT 

networks are very flexible and convenient to install and 

maintain, but it is imperative that the network layout be 

carefully planned and accurate documentation created and 

maintained. This aids in compliance verification and future 

expansion of the network. It also minimizes unknown or 

inaccurate wire run lengths, node-to-node (device-to-device) 

distances, node counts, total wire length, inaccurate repeater/

router locations, and misplaced or missing terminations. 

L

ON

W

ORKS®

 networks can be configured in a variety of ways; 

refer to the E-Bus FTT Network Wiring Guidelines, form 74-

2865, for a complete description of network topology rules and 

maximum network wire length. If longer runs are required, add 

a Q7740A 2-way or Q7740B 4-way repeater to extend the 

L

ON

W

ORKS®

 Bus length. Q7751A routers are not supported 

on LCBS L

ON

S

PEC

™ configured systems. Approved cable 

types for L

ON

W

ORKS®

 Bus communications wiring are Level 

IV, 22 AWG (0.34 sq mm) plenum or non-plenum rated 

unshielded, twisted pair, solid or stranded conductor wire. 

Refer to Table 2 for a list of Honeywell network cable part 

numbers. Other Echelon® approved cable may also be used. 

Run communications wiring in a conduit, if needed, with non-

switched 24 Vac or sensor wiring. The Free Topology 

Transceiver (FTT) communications L

ON

W

ORKS®

 Bus supports 

a polarity insensitive, free topology wiring scheme that, in turn, 

supports star, loop, and/or bus wiring.

6-3/4 (171)

2-3/16 (56)

1-9/16

(40)

4-1/2
(114)

2-1/32

(52)

2-1/32

(52)

4-1/16

(104)

1-5/8

(42)

2-3/8 (60)

3-1/4 (83)

6-9/16 (166)

M22432

1-5/8

(42)