Thanks. At the moment I'm running it from a small AC to 5V adaptor but that's one more thing plugged into AC power. I do have a 5V output from the BoB that I can use. Just have to wire it into the 7i92H. John
> -----Original Message----- > From: Les Newell [mailto:les.new...@fastmail.co.uk] > Sent: September-09-19 3:52 AM > To: emc-users@lists.sourceforge.net > Subject: Re: [Emc-users] MESA 7i92H Power > > Yes you can run it using a supply derived from 24V. In my opinion it is > better that way as it keeps the computer isolated from the potentially > noisy system ground. > > Les > > On 09/09/2019 04:30, John Dammeyer wrote: > > 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 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
