devc-ser8250 initial CTS, DSR line status error! QNX v6.0B

I have terminal connected to the host computer via serial port. If
terminal is turned on before QNX serial driver is loaded on the host
computer I experience problem reading status of CTS and DSR lines (they are
always LOW). Loading QNX driver before terminal is turned on gets status
line correct. Are there any software possibility to command serial driver to
refresh line status. I access port by open() and checking line status by