Quick question. Running signals from the parallel port to the BoB definitely couples the PC Ground into the Bob. Generally then the BoB optically isolates the PC signals from the rest of the system Or expects the motor driver to do it. And for the rest the BoB is supplied with an isolated supply that is not connected to the PC side.
Since Ethernet runs the 7i92H and it comes from the PC does the 5V power into the 7i92H have to have the 5V DC Ground common with the PC DC ground? Or can the 5V be derived from a 24V power supply whose ground is not common with the PC ground because there's no direct connection. I recall something about PCs using transformers inside the RJ-45 Ethernet connector but I don't remember for sure. John _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users