H 7505 (0630)
508
Figure 6: Use of optical fibres
The 4-wire-connections can also be designed as optical fibres.
– Range: 2000 m max.
– With using in bus systems with several bus levels coupled with repeaters the optical con-
ductors may only be used in the highest bus level (no transmission of the status signal)!
The coupling of a device with RS 232C interface is only possible with the correct operating of
the status signal.
RS 485
highest bus level
lower bus level
white switch
Legend:
* = Protective earth terminal USLKG4 ge-gn
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