Checks whether a character is available on a serial port.
serial-port
serial-port-input-available-p serial-port => result
A serial-port object.
result
A boolean.
The function serial-port-input-available-p checks the serial port associated with serial-port to see if a character is available. result is t if input is available, and nil otherwise.
serial-port-input-available-p
t
nil
LispWorks User Guide and Reference Manual - 20 Sep 2017