Kipp&Zonen COMBILOG Data Logger - Manual (Page 88)

 Line length:
depends on the transmission speed, max. 1.2 km (0.75
miles) per bus segment, max. 4.8 km (3 miles) via a phys-
ical bus string with 3 repeaters.
 Number of bus users:
max. 32 bus users per bus segment, max. 127 bus users
via a physical bus string.
10.1 Bus Interface
The bus interface in the data logger is an RS485 interface. Its
advantages compared with RS232 connections are a larger
number of users, its higher transmission speed, its higher im-
munity from interferences and the extended line length.
transmission speed
1 K 10 K 100 K
187,5 K
1 M 10 M
[bps]
10 m (32.5 ft)
100 m (325 ft)
1000 m (3.250 ft)
1200 m (3.900 ft)
transmission
600 m (1.950 ft)
RS 232
RS 422
RS 485
route
Figure 10.1 Interrelation between transmission speed and line length
Hardware Manual COMBILOG 1022 88