Schneider Electric POWERLOGIC PWRSRV750 User Manual
63230-216-207/A3
Chapter 4—Connections
9/2002
Communications Wiring
15
© 2002 Schneider Electric All Rights Reserved
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 4–3 and Table 4–4.
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 4–3 and 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.
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.
that support 2-wire connections.