Schneider Electric PWRSRV750 Communications Wiring, 3 Daisy Chain Maximum Distances 4-Wire

63230-216-207/A3			Chapter 4—Connections
9/2002			Communications Wiring
COMMUNICATIONS WIRING	The maximum number of devices supported on a single daisy chain is
	determined based on baud rate, the length of the daisy chain, and the types
	of RS-485 devices (2-wire/4-wire) on the daisy chain. The RS-485 interface
	supports daisy chains as specified in Table 4–3and Table 4–4.
	Table 4–3: Daisy Chain Maximum Distances 4-Wire
	Baud Rate	Maximum Distances*
		1–16 Devices	17–32 Devices
	1200	10,000 ft (3,048 m)	10,000 ft (3,048 m)
	2400	10,000 ft (3,048 m)	5,000 ft (1,524 m)
	4800	10,000 ft (3,048 m)	5,000 ft (1,524 m)
	9600	10,000 ft (3,048 m)	4,000 ft (1,219 m)
	19200	5,000 ft (1,524 m)	2,500 ft (762 m)
	38400	4,000 ft (1,219 m)	1,500 ft (457 m)

*Due to the volume of RS-485 devices in the field, this table is only to be used as a guide and was tabulated based on POWERLOGIC 4-wire devices and POWERLOGIC 4-wire devices that support 2-wire connections.

Table 4–4: Daisy Chain Maximum Distances 2-Wire

Baud Rate	Maximum Distances*
	1–8 Devices	9–16 Devices
1200	10,000 ft (3,048 m)	10,000 ft (3,048 m)
2400	10,000 ft (3,048 m)	5,000 ft (1,524 m)
4800	9,000 ft (2,743 m)	5,000 ft (1,524 m)
9600	6,000 ft (1,829 m)	4,000 ft (1,219 m)
19200	3,000 ft (915 m)	2,500 ft (762 m)
38400	2,000 ft (610 m)	1,500 ft (457 m)

*Due to the volume of RS-485 devices in the field, this table is only to be used as a guide and was tabulated based on POWERLOGIC 4-wire devices and POWERLOGIC 4-wire devices that support 2-wire connections.

© 2002 Schneider Electric All Rights Reserved 15