On Mon, 2012-03-19 at 16:15 -0700, Peter C. Wallace wrote: ... snip Thanks Matt and Peter. I thought Smart Serial might be a marketing spin for Modbus, but it sounds like a different animal altogether.
> No, its been designed to be real time from the beginning. Something else I'll need to learn about. > This is not to say the the firmware in the FPGA module could not be taught to > speak MODBUS Right now I'm interested in talking to VFD's and other userlandish devices. Most newer VFD's seem to have Modbus and could make more features available without adding more hardware or cabling. I haven't seen much Smart Serial milling around the Hobby CNC area, but maybe soon? > but its really been designed as a synchronous (the comms are > standard 8 bit async) realtime master slave interface where we always expect > a > reply or fault info in a very short time period I think Modbus expects a timely response too, but it seems mostly up to the programmer on what to do with it. Maybe more like "if your are going to respond, you better do it within 3.5 character spaces". > It also supports discovery which I dont think is possible with MODBUS but Im > not sure of this Modbus has a Report Slave ID query which should return more than just an ID. I thought there was a broadcast query, but now that I'm looking for it I can't seem to find it. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ This SF email is sponsosred by: Try Windows Azure free for 90 days Click Here http://p.sf.net/sfu/sfd2d-msazure _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
