Attempts to open the named serial port and return a serial-port object.
open-serial-port name &rest args &key baud-rate data-bits stop-bits parity cts-flow-p dsr-flow-p dtr rts read-interval-timeout read-total-base-timeout read-total-byte-timeout write-total-base-timeout write-total-byte-timeout => serial-port
A string naming a serial port.
See in the Description below for details of the remaining arguments.
A serial-port object.
open-serial-port attempts to open the serial port name and return a serial-port object.
On Windows, name is passed directly to
CreateFile(). For ports COMn where n > 9, you must take care to pass the real port name expected by Windows. At the time of writing this issue is documented at
If any of baud-rate, data-bits, stop-bits and parity are supplied then the corresponding serial port settings are changed. The values of baud-rate and data-bits should each be an appropriate integer. The value of stop-bits should be 1, 1.5 (Windows only) or 2. The value of parity should be one of the keywords
:odd, or on Windows,
The arguments cts-flow-p and dsr-flow-p control whether write operations respond to CTS and DSR flow control. A non-nil value means that the corresponding flow control is used. Note that dsr-flow-p is only supported on Windows.
The arguments dtr and rts control whether read operations generate DTR or RTS flow control. If the value is
:handshake then the corresponding flow control signal is generated automatically. If the value is
t then the initial state of the flow control signal is set and automatic flow control is not used. See set-serial-port-state for manual flow control. Note: the value
:handshake for dtr is only supported on Windows.
The argument read-interval-timeout can be used to control the maximum time to wait between each input character. The value
:none means that reading will not wait for characters at all, only returning whatever is already in the input buffer
The arguments read-total-base-timeout and read-total-byte-timeout can be used to control the maximum time to wait for a sequence of characters. The arguments write-total-base-timeout and write-total-byte-timeout can be used to control the maximum time to wait when transmitting a sequence of characters. For both reading and writing the timeout is given by the expression:
base_timeout + nchars * byte_timeout
The default value of each of read-total-base-timeout, read-total-byte-timeout, write-total-base-timeout and write-total-byte-timeout is
nil and this means that the corresponding parameter in the OS is left unchanged and there is zero timeout. Otherwise the value should be a non-negative real number specifying a timeout in seconds.
LispWorks User Guide and Reference Manual - 20 Sep 2017