>On Nov 20, 2015, at 12:17 PM, Róbert SZAKSZ <rob...@szaksz.eu> wrote: >> >> No progress has been made: >> >> cable is UPS - PC >> 6 - 3 >> 7 - 5 >> 9 - 2 >> > >Maybe pins 4 and 7 (ground) both need to be connected on the UPS side? I connected both to pin 5
>Unfortunately, I don't think there is a safe way (in software) to determine >whether the UPS is not receiving the signal, or whether the PC is not >receiving the reply. > >If you have a multimeter, you could check pin 9 on the UPS relative to pin 4/7 >to see if it is being driven negative. I mesured it and on DC and it shows 0 V (zero V). May be the information (pls. see attachment) that UPS PIN1 should bee keept HI is mandatory. Should I connect it to PC PIN4 DTR? OR I need to follow with contact closure cable? Best regards, Robert SZAKSZ.
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