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RS485 documentation: add 16C950 UART description

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Add a notion about 16C950 UART, that is using DTR signal for RS485 mode.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Yegor Yefremov 2010-11-22 11:06:32 +01:00 • committed by Greg Kroah-Hartman
parent a4fb0b228e
commit de6f86ce51
1 changed files with 5 additions and 4 deletions
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9
Documentation/serial/serial-rs485.txt
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@ -11,10 +11,11 @@
2. HARDWARE-RELATED CONSIDERATIONS 2. HARDWARE-RELATED CONSIDERATIONS
Some CPUs (e.g., Atmel AT91) contain a built-in half-duplex mode capable of Some CPUs/UARTs (e.g., Atmel AT91 or 16C950 UART) contain a built-in
automatically controlling line direction by toggling RTS. That can used to half-duplex mode capable of automatically controlling line direction by
control external half-duplex hardware like an RS485 transceiver or any toggling RTS or DTR signals. That can be used to control external
RS232-connected half-duplex device like some modems. half-duplex hardware like an RS485 transceiver or any RS232-connected
half-duplex devices like some modems.
For these microcontrollers, the Linux driver should be made capable of For these microcontrollers, the Linux driver should be made capable of
working in both modes, and proper ioctls (see later) should be made working in both modes, and proper ioctls (see later) should be made