Writes a character to a serial port.
A serial-port object.
The function write-serial-port-char writes the character
to the serial port associated with
, and returns
A timeout will occur if the character cannot be written before the write timeout (as specified by values given when the serial port was opened by open-serial-port).
When a timeout occurs, if
is non-nil, then an error of type
is signalled, otherwise
is returned. The default value of
LispWorks User Guide and Reference Manual - 22 Dec 2009