Honeywell W7752D specifications Lay Out Communications and Power Wiring, Lonworks Layout

EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

Step 3. Lay Out Communications and Power Wiring

LONWORKS Layout

The communications bus, LONWORKS, is a 78-kilobit serial link that uses transformer isolation and differential Manchester encoding. Wire the LONWORKS using wires with specifications set forth in Table 10. An FTT LONWORKS 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 LONWORKS terminals are connected to each wire of the twisted pair.

LONWORKS 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 LONWORKS 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 5000	Excel 10 W7754
	FCU Controller

Honeywell

D-71101 Schönaich

Made in Germany

12

Excel 10 W7752

FCU Controller

	Honeywell
9	10 11 12

termination module

Fig. 13. LONWORKS wiring layout for one daisy-chain network segment

Excel 5000	Excel 10 W7754	Excel 10 W7752
	FCU Controller	FCU Controller

		Honeywell		Honeywell
		D-71101 Schönaich
		Made in Germany
	12		9	10 11 12
		max. 60 nodes
	Excel 10 W7754	Excel 10 W7752
	FCU Controller	FCU Controller
			Honeywell	LonWorks
	Made in Germany			router
	Honeywell
termination module	D-71101 Schönaich
	12	9	10 11 12
	max. 60 nodes

Fig. 14. LONWORKS wiring layout for two daisy-chain network segments

termination module

termination module

EN2B-0285GE51 R0909 18