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INSTALLATION
PROFIBUS CONNECTOR
2–2
The Profibus connector is indicated as A in the figure above. This connector is used to
connect the P485 to the Profibus network.
The pin assignments for the Profibus connector are shown below.
Table 2–1: Profibus connector pin assignments
Pin
Signal
Description
1
-
-
2
-
-
3
B-Line
Positive RxD/TxD (RS485)
4
RTS *
Request To Send
5
GNDBUS **
Isolated ground from the RS485 side
6
+5 V BUS **
Isolated +5V output from the RS485 side (80 mA maximum)
7
-
-
8
A-Line
Negative RxD/TxD (RS485)
9
-
-
*
Used in some equipment to determine the direction of transmission. However, in normal
applications only A-Line, B-Line and Shield are used.
** Used for bus termination. Some devices such as optical transceivers (RS485 to fibre optics) may
require power from these pins.
The following Profibus connectors are recommended:
•
Profibus Max standard, part number 134928 and Profibus reversed, part number
104577, from
http://www.erni.com
•
Fast connect bus connector, part number 6GK1500-0FC00 or 6ES7 972-0BA50-0XA0,
from
http://www.siemens.com
A
B
C
D
Figure 2-1: P485 electrical connections
5
1
9
6
(female)
Figure 2-2: Profibus connector
P485 MODBUS TO PROFIBUS CONVERTER – USER GUIDE
E
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