thank you all for your answers.
In the meantime I used your tips, esp. waits between openPort, send, read, closePort.
For testing I used a bridge from pin 2 to pin 3 (DB9 or DB25) to send _and_ receive with my serial device and had success.
So I think, the main problem was using a serial RS232-Port on the windows terminal-side with a serial RS 485-port on the Mac-side, which resulted in not well defined voltages.
Finally I tested on Mac OSX 10.2.6, Rev 2.1 using Griffin Technologies gPort and alternatively the Keyspan USB2Serial, both with success.
Very happy
Richard Hillen.
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