National Instruments AT Instrukcja Użytkownika Strona 135

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Appendix B Serial Port Information
Serial Hardware and Software for Windows B-4 ni.com
Figure B-1. Typical Full-Duplex System
Half Duplex
A typical half-duplex multidrop bus architecture also involves a
master-slave protocol. However, in a half-duplex system, all transmitters
and receivers are connected to the same transmission line. A half-duplex
system is often referred to as a two-wire system. Figure B-2 shows a typical
half-duplex system.
Figure B-2. Typical Half-Duplex System
MASTER
Slave 1 Slave 2 Slave n
Tx
Tx
Rx
Tx
Rx
Tx
Rx
Rx
MASTER
Slave 1 Slave 2 Slave n
Tx
Tx
Rx Rx
Tx
Rx
Tx
Rx
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