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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.
The DIL switch settings can be found in the following table:
Operating mode
RS232
RS422, RS485, 4-wire bus master
DTR handshake
RS422, RS485, 4-wire bus master
RTS handshake
RS485, 4-wire / 2-wire with echo
DTR control
RS485, 2-wire without echo
DTR control
RS485, 4-wire / 2-wire with echo
RTS control
RS485, 2-Draht without echo
RTS control
RS485, 4-wire / 2-wire with echo
automatic control
RS485, 2-wire without echo
automatic control
*) Terminating the bus system when required.
10
RS232(/422/485) Universal Serial T-Switch
SW1
SW2
SW3
SW4
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
ON
ON
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
ON
OFF
ON
ON
ON
OFF
ON
SW5
SW6
SW7
SW8
OFF
OFF
ON
OFF
*
*
OFF
OFF
*
*
ON
OFF
*
*
OFF
OFF
*
*
OFF
OFF
*
*
ON
OFF
*
*
ON
OFF
*
*
OFF
OFF
*
*
OFF
OFF
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