I'm trying to get my SJ200 VFD connected with Modbus. In preparation for this I ported a MVX9000 which I had on the shelf. It turned out to be a slam dunk, almost. http://www.wallacecompany.com/machine_shop/EMC2/mvx9000/
The SJ200 is a different story. It turns out Hitachi made a rev. 1 and 2 of the hardware, and the register addresses are different. I only found the rev. 1 manuals on-line, but fortunately had a paper manual, that I finally found, which indicated what the problem was. Plus, there is conflicting information in the application notes about the resister addresses being offsets from the register type base address. For holding registers, it appears to be 40001. In practice thogh, the Modbus query uses only the offset and the query type, read holding register in this case, and the absolute address is handled inside the VFD. I am able to modpoll the proper registers now, but I have a problem with reading more than two holding registers in my component. It looks like I'll need to get into the bowels of libmodbus, unless someone here has dealt with this problem and can provide some advise. Thanks. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
