Linux serial port

[tech at paynesparkman.com]

How do I write to/read from a Linux serial port.  I've discovered that "COM1:" is equivalent to "Linux/dev/cua0" or "/dev/ttyS0" and that "COM2:" is equivalent to 
"Linux/dev/cua1" or "/dev/ttyS1".  The Lindows machine I'm using has its modem associated with "/dev/ttyS0" so I tried using that in place of "COM1:" and kept the other 
script the same but no dice.  Any suggestions?

Rich Mooney
Payne Sparkman Mfg.
http:\\www.paynesparkman.com