National Instruments PCI-8430 - Transceiver Control

RS-485TransceiverControl
TheRS-485hardwaresupportsfourmodesofhardwaretransceiver
control.Youcanusehardwaretransceivercontroltoenableanddisable
yourtransmittersandreceiverssothattheyfunctionondifferentbus
topologies.Thefollowingtableliststhestatusofthetransmittersand
receiversundereachtransceivercontrolmode.
RS-485TransceiverControlModes
Mode Transmitter Receiver
Four-wiremode Alwaysenabled Alwaysenabled
Two-wiremode:DTR
controlledwithecho
EnabledwhenDTR
asserted
Alwaysenabled
Two-wiremode:DTR
controlled
EnabledwhenDTR
asserted
EnabledwhenDTR
unasserted
Two-wiremode:Auto
Control
Enabledwhen
transmittingdata
Enabledwhennot
transmittingdata