W&T Electronics 13011, Руководство пользователя

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W&T
Serial PCI cards
RS422, RS485 4-wire-Bus-Master
One data and one handshake channel each in each direction is
available. The RS422/RS485 driver and receiver chips are always
active in this mode.
RS485 4-wire mode / RS485 2-wire mode with echo,
handshake control
One data channel in each direction is available. The RS485 dri-
ver chip is turned „ON“ with RTS or DTR, whereas RTS or DTR =
„OFF“ turns the driver into tristate. The receive channel is al-
ways active in this mode.
RS485 2-wire mode without echo, handshake control
One data channel in each direction is available. The RS485 dri-
ver chip is turned „ON“ with RTS or DTR, whereas RTS or DTR =
„OFF“ turns the driver into tristate. The receive channel is deac-
tivated when the driver is turned on and the channel is on when
the driver is in tristate.
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 turned on when the driver is in tristate.