10
W&T
RS232(/RS422/RS485) Multi Computer Adapter
master on an additional common conductor pair. The RS485
transceivers are always active in this mode, whereby the master
can always send and is constantly listening for the slaves.
RS485 4-wire mode with handshake control
The RS485 driver chip is turned on with a TTL Low level on the
„DTR“ or „RTS“ line, whereas a TTL High level on this line puts
the driver in a high-impedance state. The receiving channel in
this mode is always active.
RS485 2-wire mode with handshake control
The RS485 driver chip is turned on with a TTL Low level on the
„DTR“ or „RTS“ line, whereas a TTL High level on this line puts
the driver in a high-impedance state. The receiving channel is
deactivated when the driver is on, and enabled when the driver
is in the high-impedance state.
RS485 4-wire mode with automatic control
The RS485 driver chip is automatically activated whenever data
are output and brought to the high-impedance state when data
output is finished. The receiving channel in this mode is always
active.
RS485 2-wire mode with automatic control
The RS485 driver chip is automatically activated when data are
output and brought to the high-impedance state when data
output is finished. The receiving channel is deactivated when
the driver is turned on, and enabled when the driver is in the
high-impedance state.
