![]() ![]() Select "Holding Register(s)" radio button and click on "Write". You must set "Slave Addr" to 1, "Start" to 3, "Num Regs" to 1 and Data to BB8 (replace my 81 with BB8), which is the frequency according to my example and is corresponds to 30.00Hz. I don't know if it is working, but the way I see it, it should. Use the above example from the HY manual. When you have managed to open the port you can test sending message. "Status" field must say "No error" otherwise you have a problem which you must fix before continuing. The way to do it in Mach3 Modbus serial control monitor window is that you must set the port number for your RS485 port (4 in my picture), the bps (38400 for me) and click on "Open". Use this example to see if you can set the spindle speed. Have a look at that, as well as you must make sure that you select Modbus RTU, not ASCII, in PD165, and the settings match the Mach3 communication parameters. I made the above post just the other day regarding the HY and Modbus.
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