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7 Functional Description of the Fieldbus Modules

7-34

Connector pin assignment

RJ45 socket

Fig. 7-15 FI 840F connector pin assignment

Pin: Signal Description

1 TD+ Transmit signal +

2 TD- Transmit signal -

3 RD+ Receive signal +

4 n. c. Not used

5 n. c. Not used

6 RD- Receive signal -

7 n. c. Not used

8 n. c. Not used

Two different cable types are available for connecting an FF/HSE module:

• Use a cable with the transmit branch (TD+/TD-) of one module crossed over the

receive branch (RD+/RD-) of the other module (cross cable) for a direct link

between two FF/HSE nodes.

• When connecting other components, e.g. a hub, this cross-over is done in the

connector. As a result, a 1:1 cable has to be used.

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