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9.1
Pin Assignment
The data transmission is performed in RS485 operating mode (i.e., physical
RS485). The VPC3+S is connected via the following signals to the
galvanically isolated interface drivers.
Signal Name
RTS
TXD
RXD
Figure 9-1: PROFIBUS Signals
The PROFIBUS interface is a 9-way, sub D, plug connector with the
following pin assignment.
Pin 1 - Free
Pin 2 - Free
Pin 3 - B line
Pin 4 - Request to send (RTS)
Pin 5 - Ground 5V (M 5 )
Pin 6 - Potential 5V (floating P5 )
Pin 7 - Free
Pin 8 - A line
Pin 9 - Free
The cable shield must be connected to the plug connector housing.
The free pins are described as optional in IEC 61158-2.
CAUTION:
The pin names A and B on the plug connector refer to the signal names in
the RS485 standard and not the pin names of driver ICs.
Keep the wires from driver to connector as short as possible.
VPC3+S User Manual
Copyright © profichip GmbH, 2012
PROFIBUS Interface
Input/Output
Function
Output
Request to send
Output
Sending data
Input
Receiving data
Revision 1.04
9
9
PROFIBUS Interface
109
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