Electrical installation
31
PROFIBUS connection
The bus cable is connected to connector X1 on the RPBA-01.
The connector pin allocation described below follows the
PROFIBUS standard.
X1 Description
1 Not used
2 Not used
3 B Data positive (Conductor 1 in twisted pair).
4 RTS Request To Send
5GND
BUS
Isolated ground
6 +5V Isolated 5V DC voltage supply
7 Not used
8 A Data negative (Conductor 2 in twisted pair).
9 Not used
Housing SHLD PROFIBUS cable shield. Internally connected
to GND BUS via an RC filter and directly to
CHGND.
+5V and GND BUS are used for bus termination. Some devices,
like optical transceivers (RS485 to fibre optics) might require
external power supply from these pins.
RTS is used in some equipment to determine the direction of
transmission. In normal applications only the line A, line B and
shield are used.
X1
1
69
5
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