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.
Dave On 2/8/2016 8:16 AM, andy pugh wrote: > I am tempted to attempt to control the lathe VFD with Modbus. > > I have one of these: > http://www.ebay.com/itm/CH340-USB-to-RS485-485-Converter-Adapter-Module-For-Win7-Linux-XP-Vista-/201258967189?hash=item2edbf82095:g:SDAAAOSw2s1UrPYd > > I need to connect to 8P8C connector on the VFD which has pins > 1 A' > 2 B' > 3 A' > 4 R > 5 D > 6 B' > 7 DP5V > 8 SG(GND) > > Is that ever going to work? The YSB dongle seems deficient in > terminals by at least 1, possibly 4... > > ------------------------------------------------------------------------------ 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
