Changes various aspects of the state of a serial port.
set-serial-port-state serial-port &key dtr rts break
A serial-port object.
set-serial-port-state changes various aspects of the state of the serial port associated with serial-port.
The argument dtr, if supplied, controls the DTR line. A true value means set and
nil means clear. If dtr is not supplied, the state is unchanged.
The argument rts controls the RTS line in the same way.
The argument break controls the break state of the data line in the same way.
LispWorks User Guide and Reference Manual - 20 Sep 2017