AppendixB SerialPort Information
SerialHardware and Software for Windows B-4 ni.com
FigureB-1. TypicalFull-Duplex System
Half Duplex
A typical half-duplex multidrop bus architecture also involvesa
master-slaveprotocol. However, in a half-duplex system, all transmitters
and receiversare connected to the same transmission line. A half-duplex
systemis often referred to as a two-wire system. Figure B-2showsa typical
half-duplexsy stem.
FigureB-2. TypicalHalf-Duplex System
MASTER
Slave1 Slave2 Slaven
Tx
Tx Rx Tx Rx Tx Rx
Rx
MASTER
Slave1 Slave2 Slaven
Tx
Tx Rx Rx
Tx Rx
Tx
Rx