What is the multipler at the end of a G-code command?

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1

In Repetier, you manually move the spindle head and it issues the command:

G1 X-100 F2100*16

I understand all of that except the totally random last number. Its a different multiplier almost every time I press a manual move button.
What is this final multiplier number?

2

That is a checksum. I think Marlin just ignores it.

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3

Thanks Jeff. I couldn’t see that it actually did anything

4

My wireless controller is coming along well. Only just got back to it after the break.

However… when I send a command to the Rambo, it ignores that command until the next one arrives?

For instance:

“M117 This is my CNC machine” This would print that on the LCD display
But, that doesn’t happen until either I send it a second time, or a different command.

Doesn’t appear to be the checksum (no error generated), so hmm?

5

How are you sending it? Is it still in the outgoing buffer, or do you need to add a newline, maybe?

6

Exactly the issue…
I was sending it without a newline command, so it only got actioned when the next line arrived.

The checksum doesn’t ‘check’ unless you supply a line number first… just as a side note

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