Set parameter of the open serial port
serialset(handle,name,value)
number, handle to open serial port
string, name of parameter
Values are 'baud', 'data_bits', 'stop_bits', 'parity', 'break', 'flow_control', 'dtr', 'dsr', 'rts', 'cts', 'dcd', 'ri', 'timeout'
number, value of parameter.
timeout is measured in milliseconds.
Low level procedure.
Set parameter of the open serial port.