RS232 errors
------------

Return codes
	Invalid COM port
	COM port is not open
	Invalid option specification or parameter
	No serial port found
	Output queue is full
	COM port already open
	Input queue is empty
	Asynch Manager internal
Input queue access
	Input lost
	Asynch Manager internal
	Parity
	Overrun
	Framing
	Break

Routines used and possible errors
---------------------------------

Open_a1
	Return codes
		Invalid COM port
		Invalid option specification or parameter
		No serial port found
		COM port already open
Close_a1
	Return codes
		Invalid COM port
		COM port is not open
WrtBk_a1
	Return codes
		Invalid COM port
		COM port is not open
		Output queue is full
RdBk_a1
	Return codes
		Invalid COM port
		COM port is not open
		Output queue is full
		Input queue is empty
	Input queue access
		Input lost
		Parity
		Overrun
		Framing
		Break
QSize_a1
	Return codes
		Invalid COM port
		COM port is not open
	Input queue access
		Input lost
		Parity
		Overrun
		Framing
		Break
IFlsh_a1
	Return codes
		Invalid COM port
		COM port is not open
Setop_a1
	Return codes
		Invalid COM port
		COM port is not open
		Invalid option specification or parameter
Time_a1