text: <s>[INST] Host Index instruction Ultra 3000 (Host Command) Hello.I am using a MicroLogix1200 to send commands to an Ultra3000, When I tried to change the Host index data the Ultra does not change it and it does not answer the serial command (the buffer is empty). I checked the send data by using the hyper terminal and it is right. When use the Ultra HostCommand Ultraware this instruction only works when I have open the Indexing control Panel, if this control panel is closed the instruction does not works neither.The instructions that the Ultra is responding are: enable drive, disable drive and start index (send from PLC and Ultraware).Is there anything else I can check??? Why the Ultra is not developing the instructions I sent?The command I am using to change the Host index is::000B810164<cr>Also, I tried to read the actual index without success.Thanks !!! :smileywink: [/INST] Hi Queen, unfortunately I'm not an expert on that... just trying to give helps... :smileytongue: The command syntax and checksum seems correct... just did you set the drive for Host Control Mode - Host Indexing (0x061) before trying the Host Index command ? Page C-7 of the Host Commands Reference Manual reports the correct sequence... - fuzzy logic \\n </s>