I have been at this fingerprint reader on and off for months now and I cant get it to open using sfgDemo2.1 or EM01test windows programs.
I have the fingerprint reader buffered by a max233, and can see both rs232 data in and out and ttl levels in and out of the fingerprint reader.
I have used both a verified HL-340 usb to serial cable on com 2 and a verified 9 pin serial cable on com 3.
I have tried varying the supply voltage to only the reader from 3.3 to 5.9 volts as allowed by the datasheet. I have tried inverting the data in all combinations.
At one point I was able to make the reader leds light up steady while trying to read a fingerprint, before timing out, but I had not successfully opened the reader first.
No, i'm not using an arduino between the pc and the max233, as there should be no reason to. (i do not own an arduino)
What I would like is send the fingerprint reader to an experienced United States user to verify good or bad. (You should have one working)
If it is good, of course I will pay for return shipping and incidentals.
If interested please contact me at firstname.lastname@example.org