AS-i/PROFIBUS Gateway
Connections, Displays and Operating Keys
Subject to reasonable modifications due to technical advances.
Copyright Fuchs, Printed in Germany
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ue dat
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12.
8.
2007
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5.1.1.1
Function ground
5.1.2
PROFIBUS interface
The PROFIBUS interface is realized as a 9-pin SUB-D connector, in accordance
to the standard for PROFIBUS DIN 19245.It is placed at the top left-hand side of
the master.The AS-i/PROFIBUS gateway sends and receives on pins 3 and 8 of
the SUB-D socket. The PROFIBUS signal “RxD/TxD-N (data line A)
1
” is located
on pin 8, the signal “RxD/TxD-P (data line B)
1
” is located on pin 3.
The pins 5 (0 V) and 6 (5 V) supply 5 V DC for the bus termination.
• The function ground can be connected either at the ground screw or at the
terminal.
• The function ground should be connected with a cable as short as possible to
guarantee a good EMC property.
• Therefore is to prefer to connect the ground via the ground screw.
1. If you measure the DC voltage between RxD/TxD-P (data line B) and RxD/TxD-N (data line A), RxD/TxD-P (data line B) is the positive pole
when the bus is silent.
5
4
3
2
1
9
8
7
6
R x D /T x D -P
(d a ta lin e B )
R x D /T x D -N
(d a ta lin e A )
P R O F IB U S
V P / + 5 V o lt)
D G N D (0 V o lt)
