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-485 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
RS485
RxD/TxD -
Receive data / Transmit data negative
5
RS485
RxD/TxD +
Receive data / Transmit data positive
6
Ethernet
RX–
Receive data negative *
7
not
used
8
not
used
PE
metal housing on PE
RJ45 socket, fe-
male
* Bob Smith Abschluss
Table 29: RJ45 Ethernet / RS-485 Pin Assignment
The figure on the right shows a Y
cable adapter for the separation of
the RS-485 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 RxD/TxD+ sig-
nal of one device is connected to
the RxD/TxD+ signal of the other
device for a RS-485 connection.
Make sure that the RxD/TxD- signal
of one device is connected to the
RxD/TxD- signal of the other device
for a RS-485 connection.
You can use a direct cable con-
nection to the RS-485 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-485 cable dur-
ing configuration of the NT 50
device.
Diagnostic is not possible while
the RS-485 interface is used with
the cable shown at the right.
