potman100:
Hi PaulThanks for the reply, sorry don't have access to a oscilloscope, but do have a DVM, having taken a few measurement, the voltage reading don't go over 3.2v on 3 of the pins and 0 on the fourth which I take it is ground, so I think the arduino would be ok.
Then it is not RS-232. And an Arduino would be ok if the voltage never goes negative. Only a 'scope will tell you that while a data stream is being sent.
Can you determine what else, electronics, IC's, etc are in the dongle? 3.2 volts is not TTL, either. Could your reading of 3.2 volts be an average of the varying data signal.
Paul