Lines Matching +full:rs485 +full:- +full:rts +full:- +full:delay

2 RS485 Serial Communications
8    EIA-485, also known as TIA/EIA-485 or RS-485, is a standard defining the
15 2. Hardware-related Considerations
18    Some CPUs/UARTs (e.g., Atmel AT91 or 16C950 UART) contain a built-in
19    half-duplex mode capable of automatically controlling line direction by
20    toggling RTS or DTR signals. That can be used to control external
21    half-duplex hardware like an RS485 transceiver or any RS232-connected
22    half-duplex devices like some modems.
26    available at user-level to allow switching from one mode to the other, and
32    The Linux kernel provides the struct serial_rs485 to handle RS485
33    communications. This data structure is used to set and configure RS485
36    The device tree can also provide RS485 boot time parameters
37    [#DT-bindings]_. The serial core fills the struct serial_rs485 from the
41    Any driver for devices capable of working both as RS232 and RS485 should
48    what RS485 features the driver supports for the ``struct uart_port``.
52 .. kernel-doc:: include/uapi/linux/serial.h
55 4. Usage from user-level
58    From user-level, RS485 configuration can be get/set using the previous
59    ioctls. For instance, to set RS485 you can use the following code::
63 	/* Include definition for RS485 ioctls: TIOCGRS485 and TIOCSRS485 */
74 	/* Enable RS485 mode: */
77 	/* Set logical level for RTS pin equal to 1 when sending: */
79 	/* or, set logical level for RTS pin equal to 0 when sending: */
82 	/* Set logical level for RTS pin equal to 1 after sending: */
84 	/* or, set logical level for RTS pin equal to 0 after sending: */
87 	/* Set rts delay before send, if needed: */
90 	/* Set rts delay after send, if needed: */
110    The Linux kernel provides addressing mode for multipoint RS-485 serial
117 	- ``SER_RS485_ADDRB``: Enabled addressing mode (sets also ADDRB in termios).
118 	- ``SER_RS485_ADDR_RECV``: Receive (filter) address enabled.
119 	- ``SER_RS485_ADDR_DEST``: Set destination address.
122 	- ``addr_recv``: Receive address.
123 	- ``addr_dest``: Destination address.
130    Note: not all devices supporting RS485 support multipoint addressing.
135 .. [#DT-bindings]	Documentation/devicetree/bindings/serial/rs485.txt