[HECnet] SC-40

On 2015-02-12 20:12, Cory Smelosky wrote: Sent from my iPhone On Feb 12, 2015, at 14:09, Peter Lothberg <roll at Stupi.SE> wrote: Depending on config of the system chasseie ground and signal ground might be isolated. The only ground connected is shield ground. ;) That is just plain wrong. If there is a "klinik" (another DB25 port, or if it has DB25's for user terminals (check if there is a board connected on the able) measure from pin 7 to pin 7 in another connector. Pin 7 is NCL on all the serial breakouts I have. Huh? Pin 7 on a DB25 RS-232 is signal ground. It is one of the three pints you actually need. The other two being pin 2&3. No other pin is required, but 2,3,7 are the ones *absolutely* required. And for a null modem cable, you connect: 2-3 3-2 7-7 Johnny