defo a null modem cable that your using? and not a straight through one is it? have you used that com port before....it's not been set to shut down or any thing for power saving etc...(com port that is)
going back to your 1st post, who gave you it and why was it for free, any history on it from the person that you got it from....a free box seems strange if you get me.
going back to your 1st post, who gave you it and why was it for free, any history on it from the person that you got it from....a free box seems strange if you get me.