On 11/30/2014 11:15 PM, Mark Johnsen wrote: > Sebastian (and others) - thanks for the reply. I have a little voice in my > head since the Houston LinuxCNC Fest, "Update manuals where you can..." > :-) > > I'll make sure I get the cable pinout included in the manuals as I googled > a 9-pin dsub serial port to determine if pin 2 or 3 is the Tx or Rx, only > to find out after the fact that guessing would have been just as good as > the google images of 9-pin dsubs have no consistency. Some images show pin > 2 as Tx, some show pin 2 as Rx. That's no help...
For an RS-232 connection (with software handshake selected), there are only three wires used; Rx, Tx, and ground. The VFD manual shows the pin-out on the VFD side. There are plenty of sources for PC serial port pin-outs. You can unplug the VFD side and jumper the Rx and Tx pins to loop the signal back. Minicom can be used to send data and check for its echo.RS-485 gets more complecated, but can also be on a 9-pin D-sub. Modbus gets more complicated because you won't get a response until the link is working (there is a broadcast packet that can be handy). There are sniffers you can use to help troubleshoot, maybe WireShark? It has been a while since I have played with this, so I'm a bit rusty. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=157005751&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
