On 02/08/2016 07:01 PM, Dave Cole 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. >> >> Also, I can't find any documentation of the Lovato VE1 modbus >> interface. No register numbers, and only the pinout info above. > Unless you need to change drive parameters it might be a waste of time. > > Analog is easy.
Analog is hard, very hard, if you want the same quality as the digital equivalent. There is a reason why there is a strong trend for going digital, which is primarily rooted in noise-immunity and signal recovery. An analog signal is, just like digital, bound by impedance of the transmission line. However, a slight imbalance in digital is recoverable, whereas an analog version will skew the result without possibility of (correct) recovery. Noise in analog will reduce the effective resolution, whereas noise in digital can be easily filtered and the resolution stays constant. Analog signals cannot be isolated easily and trying so results in awkward non-linearities that need to be compensated. A digital signal is easily isolated and does not require complex compensation. -- Greetings Bertho (disclaimers are disclaimed) ------------------------------------------------------------------------------ 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
