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W&T
Pin configuration
The Profibus connection for the modules is configured as a
9-pin female SUB-D connector, with the TTL interface formatted
as 12-pin male post connector. Refer to the following
table for connector pin assignments:
TTL interface
pin#
signal
1
5V ±5%
2
RI
3
RxD
4
TxD
5
n.c.
6
CTS
7
DTR
8
DSR
9
RTS
10
DCD
11
12V ±10%
12
GND
Pin 1 of the TTL interface is indicated by a rectangular soldering pad.
Operating modes
The RS485 interface module basically operates in RS485
2-wire mode with automatic control.
One data channel in each direction is available. The RS485
output driver is activated automatically with each transmission
of data, and goes to the high impedance state again
after the end of transmission. The RS485 receiving channel is
deactivated when the driver is on, but is switched on when the
driver is in the high impedance state.
78
function
Vcc
"low" level
output
input
n.c.
"low" level
n.c.
"low" level
n.c.
"low" level
n.c.
signal GND
Interface modules
Profibus interface
pin#
signal
1
Shield
2
n.c.
3
RxD/TxD-P
4
CNTR-P
5
DGND
6
VP
7
n.c.
8
RxD/TxD-N
9
CNTR-N
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