Honeywell LONWORKS BUS 3252 user manual

Summary of the content on the page No. 1

LONWORKS® Bus
Wiring Guidelines
HONEYWELL CABLE 3252, 3253, 1061,
AK3797, AK3798, AK3799
USER’S GUIDE
INTRODUCTION
DEVICE DEVICE
The Free Topology Transceiver (FTT) supports polarity
insensitive, free topology wiring. This frees the system
TERMINATION DEVICE DEVICE DEVICE DEVICE
installer from wiring using a specific bus topology. T-tap, star, MODULE
SINGLY TERMINATED
loop, and mixed wiring topologies are all supported by this
architecture. Free topology wiring reduces the time and
expense

Summary of the content on the page No. 2

LONWORKS® BUS WIRING GUIDELINES System expansion is simplified by the use of physical layer NOTES: repeaters and routers. The Q7740A 2-Way or Q7740B 4-Way — There can be no more than one repeater on either devices perform a repeater function, and the Q7751A side of a Q7751A router. operates as a router. See Fig. 2. If a LONWORKS Bus segment — An FTT network can have no more than one router grows beyond the maximum number of devices or total wire per Zone Manager. Systems requiring high levels

Summary of the content on the page No. 3

LONWORKS® BUS WIRING GUIDELINES Table 1. Daisy-chain FTT Network Bus Topology Transmission Specifications (Doubly Terminated). Cable Parameters Maximum FTT Network Bus Wire/Cable Type (Unshielded) C nF/km Vprop% of c AWG/Dia. RloopW/km Length for Segment(s) 2 Honeywell Cable 1125 (stranded non-plenum) 79 67 17.9 4600 feet (1400 m) 16/1.5 mm 2 Belden 85102 (stranded non-plenum) 56 62 28 8900 feet (2700 m) 16/1.5 mm Belden 8471 (stranded non-plenum) 72 55 2 Level IV Cable Specifications, 22AWG (s

Summary of the content on the page No. 4

LONWORKS® BUS WIRING GUIDELINES 2 Table 5. Echelon Generic Cable Specification For Belden 85102 Equivalent, Stranded Twisted Pair 16 AWG (1.5 mm ). Minimum Typical Maximum Units Condition DC Resistance, each conductor 14.0 14.7 15.5 Ohms/km 20°C per ASTM D 4566 DC Resistance Unbalance 20°C per ASTM D 4566 Mutual Capacitance per ASTM D 4566 Characteristic Impedance 92 100 108 Ohms 64 khz to 1 Mhz, per ASTM D 4566 Attenuation 20 khz 1.3 Db/km 20°C per ASTM D 4566 64 khz 1.9 78 khz 2.2 156 khz 3.0