Device Drawings and Connections
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netTAP NT 50 | Gateway Devices
DOC091202UM09EN | Revision 9 | English | 2013-02 | Released | Public
© Hilscher, 2010-2013
RS-232 and Ethernet on RJ45 Pin Assignment
Ethernet
Pin
Signal
Description
1
Ethernet
TX+
Transmit data positive *
2
Ethernet
TX–
Transmit data negative *
3
Ethernet
RX+
Receive data positive *
4
RS232
3,3 V
Data potential 'High', not usable as power
supply. Ri appr. 300
Ω
.
5
RS232
GND
Data reference potential, ground of power
supply
6
Ethernet
RX–
Receive data negative *
7
RS232
TxD
Transmit data
8
RS232
RxD
Receive data
PE
Metal case on PE
RJ45 socket, fe-
male
* Bob Smith Termination
Table 27: RJ45 Ethernet / RS-232 Pin Assignment
The figure on the right shows a Y
cable adapter for the separation of
the RS-232 and the Ethernet signal
lines.
Make sure that there is no interrup-
tion of the shield connection when
preparing the cable.
Make sure that the TxD signal of
one device is connected to the RxD
signal of the other device for a RS-
232 connection.
An Ethernet connection is neces-
sary for configuration and diagnos-
tic.
You can use a direct cable con-
nection to the RS-232 remote
device as shown on the right.
An Ethernet cable is required for
configuration of the device as
shown on the left, which has to be
plugged into the X3 RJ45 socket
instead of the RS-232 cable dur-
ing configuration of the NT 50
device.
Diagnostic is not possible while
the RS-232 interface is used with
the cable shown at the right.
