Siemens RS-485 Wartungshandbuch Seite 143

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Bus connectors and preassembled cables
6.3 FastConnect D-sub bus connector
PROFIBUS Network Manual
System Manual, Edition 04/2009, C79000-G8976-C124-03
143
Disconnecting a station
The bus connector allows you to disconnect a node from the bus without interrupting the
data traffic on the bus.
Removing the bus connector when the terminating resistor is activated at the ends of the
cable causes disruptions on the bus and is not permitted.
Bus connector with a programming device socket
We recommend that you include at least one bus connector with a PG socket in each bus
segment. This makes it easier to commission using a programming device or PC.
In the bus connectors with a PG socket, all the contacts are connected 1:1 with the
connector pins; in other words, the pinout is the same as the pinout of the attached device.
Pinout of the D-sub male connector
The following table shows the pinout of the 9pin D-sub male connector.
Table 6- 3 Pinout of the 9-pin D-sub male connector
Pin no. Signal name Description
1 - -
2 - -
3 RxD/TxD-P Data line B
4 - -
5 M5V2 Data reference potential (from node)
6 P5V2 Power supply plus (from node)
7 - -
8 RxD/TxD-N Data line A
9 - -
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