ABB AC 800F

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.