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The error can be the cable and it has to do with the DTR / DSR that cross on the cable. With new PC's that are more energy efficient only put out 3.3 volts on the DSR and it needs 5 vdc. To fix the issue tie the DTR / DSR pins 4 and 6 together on both side and not cross them. This will set the DSR high and will now be able to transmit and communicate.