Wait…. http://tandy.wiki/TPDD
Cable The "RS-232C" interface to the TPDD is actually 5v TTL (0v to +5v), while RS-232 serial ports use -12v to +12v. So the cable isn't just a cable, it has electronics inside the DB25 plug to convert the signal levels between TTL and RS-232. According to that, the TPDD is 5V TTL level serial. Were you aware of that already? From: Stephen Adolph Sent: Saturday, January 9, 2021 9:25 AM To: m...@bitchin100.com Subject: [M100] connect TPDD to standard PC COM port Question for the crowd, Is there any issue with the signal levels on the TPDD not being truly RS-232, and so it isn't able to signal on the line to the right levels and hence cannot connect to a PC properly? What I am trying to do, since VirtualT seems to be unable to receive any data (still can't get that to work), I've reverted to this M100 <------> PC COM1 (sniffer program) PC COM2 <------> TPDD I have the M100 <---> COM1 working I have COM2 <-----> NADSbox working But I cannot get COM2 <-----> TPDD working! I have a feeling it is the non-RS-232 signal levels of the TPDD. thx Steve
