Siemens SIMATIC NET IE/WSN-PA Link, Compact Operating Instructions

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Installation and connecting up
3.4 Connector
IE/WSN-PA Link
Compact Operating Instructions, 12/2012, A5E02509264-AD
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Figure 3-6 Typical 2-wire multipoint network
The figure shows a typical 2-wire multipoint network as operated with the IE/WSN-PA Link.
According to the RS-485 specifications, the transmission cable must be terminated at both
ends of the network. The termination is, however, only intended for high transmission speeds
above 115 kbps and over long cable lengths. For the transmission speeds implemented with
the IE/WSN-PA Link, it is normally not necessary.
Serial connection
Note
With the normal systems, this is as follows:
A = Tx+ and
B = Rx-
Remember that this is sometimes reversed.
Connect 4-wire systems according to the following figure:
Tx +
Tx + = (A)
Rx +
Tx -
Rx -
Rx - = (B)
Note

Use shielded twisted pair cable for the serial connection.

Contact the shield on the serial host and leave it free on the IE/WSN-PA Link.
Make sure that the shielding of the IE/WSN-PA Link is insulated to avoid problems with
grounding.