W&T Electronics 13011, Руководство пользователя

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51
W&T
Serial PCI cards
Subject to error and alteration
RS485 4-wire mode / RS485 2-wire mode with echo,
automatic control
One data channel in each direction is available. The RS485 dri-
ver chip is automatically activated for each data transmission
and reset to tristate after data output is finished. The receive
channel is always active in this mode.
RS485 2-wire mode without echo, automatic control
One data channel in each direction is available. The RS485 dri-
ver chip is automatically activated for each data transmission
and reset to tristate after data output is finished. The receive
channel is deactivated when the driver is turned on, and the
channel is on when the driver is in tristate.
The DIL switch mode settings are shown in the following table:
Operating mode SW1 SW2 SW3 SW4 SW5 SW6 SW7 SW8
RS232 OFF OFF OFF OFF OFF
OFF
OFF ON
RS422, RS485, 4-wire bus master
DTR handshake
OFF OFF OFF ON OFF
* *
OFF
RS422, RS485, 4-wire bus master
RTS handshake
OFF OFF OFF OFF ON
* *
OFF
RS485, 4-wire / 2-wire with echo
DTR control
OFF OFF ON ON OFF
* *
OFF
RS485, 2-wire without echo
DTR control
ON OFF ON ON OFF
* *
OFF
RS485, 4-wire / 2-wire with echo
RTS control
OFF OFF ON OFF ON
* *
OFF
RS485, 2-Draht without echo
RTS control
ON OFF ON OFF ON
* *
OFF
RS485, 4-wire / 2-wire with echo
automatic control
OFF ON OFF ON OFF
* *
OFF
RS485, 2-wire without echo
automatic control
ON ON OFF ON OFF
* *
OFF