> On 8 February 2016 at 17:40, Dave Cole <linuxcncro...@gmail.com> wrote: > > RS485 is two wire, half duplex. > > I think you have a RS422 connection that can run full duplex. > > I don't recognize the D and R pins?? Perhaps Data Ready and Request > > to Send ?? > > Those aren't normally required for RS422. > > I am becoming increasingly tempted to forget the Modbus idea. > Analogue control is realtime, for one thing.
Quite a lot of digital bits per second is required to replace the bandwidth in an analog signal even for slow operational amplifiers. RS-485 require termination and driver may need supply voltage both side of the isolation barrier if there is one. Figure of the termination of way down this link https://en.wikipedia.org/wiki/RS-485 Nicklas Karlsson ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=272487151&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
