Hi,
do you have the right settings in ProTool and on the OP170B?
OP170B:
You should look into the Transfer Settings of the OP170B. Is the serial port enabled?
Link for the manual of the OP170B:
(page 3-9) http://support.automation.siemens.com/WW/view/en/1838350
ProTool:
Transfer Settings of ProTool: "Datei > Download > Preferences...". Is the serial port selected?
Cable:
Works yourserial cablecorrect? Maybe you should change your cable.
Bye
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