The cycle start clicking has no effect about iosender HOT 8 CLOSED

Do you have a GCode program loaded?

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yes，just like this

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and I have tried using other software and there is no problem @phil-barrett

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I tried to directly control with the G0 Z5 command and found that it could be controlled. I wonder if the iosender did not send any commands @phil-barrett

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maybe some details would help - which processor? any plug-ins? How is the controller set up? (external buttons, limit switches, etc...).

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Is there any msg on console ?

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I wonder if the iosender did not send any commands

A star * is shown in front of each gcode block sent, this changes to ok when the controller acknowledges reception.
If you enable Agressive buffering in Settings App the sender will fill the controller buffer before waiting for acknowledge from the controller. A grblHAL controller typically has a 1Kbyte buffer, legacy Grbl only 128 bytes.
Note that Grbl v0.9 or non-Grbl controllers are not supported by the sender.

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I think it's my problem, I'm very sorry. Based on your prompt, I have resolved the problem. Thank you again @phil-barrett @terjeio

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