Kippzonen COMBILOG Data Logger Manuel d'utilisateur télécharger pdf (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

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Kippzonen COMBILOG Data Logger Manuel d'utilisateur Page 88