National Instruments ENET-232 Series User Manual page 80

Appendix D Serial Port Information
Tx
Rx
Tx
Rx
ENET-232 and ENET-485 Series User Manual
Figure D-1 shows a typical full-duplex system.
Slave 1
Tx
Rx
Figure D-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.
Figure D-2 shows a typical half-duplex system.
Slave 1
Tx
Rx
Figure D-2. Typical Half-Duplex System
Slave 2
Tx
Rx
Slave 2
Tx
Rx
D-4
Slave n
Tx
Rx
Slave n
Tx
Rx
ni.com