Installation OZD Profi 12M ...
Release
01
07/2017
47
4.6 Connecting the electric bus cables
Figure 7: Assignment of D-Sub socket
Depending on the device variant, the repeaters are fitted with one or two
RS 485 electrical ports. This is a 9-pin D-Sub socket with a screw lock
(inside thread UNC 4-40).
The pin assignment complies with the PROFIBUS standard. At Pin 6
there is a short circuit-proof 5 V output for supplying external pull-up/pull-
down resistors.
As opposed to the 24V power supply, the RS 485 bus lines RxD/TxD–N
and RxD/TxD–P are indirect-coupled (functional separation) within SELV
restrictions.
The RS 485 interface is electrically connected to the front panel/function
ground.
Only use shielded and twisted-pair wiring as a RS 485 bus line.
Use a PROFIBUS bus connector plug to connect the RS 485 bus
segment.
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