Black Box USB Single-Port Hub IC266A Spécifications télécharger pdf (Page 22)

APPENDIX B: Electrical Interfaces

allow the electrical presence of the driver to be removed

from the line. Only one driver may be active at a time

and the other driver(s) must be tri-stated. RS-485 can be

cabled in two ways: two-wire and four-wire mode. Two-

wire mode does not allow for full-duplex

communication and requires that data be transferred in

only one direction at a time. For half-duplex operation,

the two transmit pins should be connected to the two

receive pins (TX+ to RX+ and TX- to RX-). Four-wire

mode allows full-duplex data transfers. RS-485 does not

define a connector pinout or a set of modem control

signals. RS-485 does not define a physical connector.

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Black Box USB Single-Port Hub IC266A Spécifications Page 22