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ZPL Commands
~HM
170
45541L-004 Rev. A ZPL II Programming Guide 9/15/06
~HM
Host RAM Status
Description Sending ~HM to the printer immediately returns a memory status message to
the host. Use this command whenever you need to know the printer’s RAM status.
When
~HM is sent to the Zebra printer, a line of data containing information on the total
amount, maximum amount, and available amount of memory is sent back to the host.
Format ~HM
Comments Memory taken up by bitmaps is included in the currently available memory
value (due to
^MCN).
Downloading a graphic image, fonts, or saving a bitmap affects only the amount of RAM. The
total amount of RAM and maximum amount of RAM does not change after the printer is
turned on.
Example • This example shows when the ~HM is sent to the printer, a line of data containing
three numbers are sent back to the host. Each set of numbers is identified and explained in the
table that follows:
3584,3586,3586
2
1
3
1
The total amount of RAM (in kilobytes) installed in the printer. In
this example, the printer has 1024K RAM installed.
2
The maximum amount of RAM (in kilobytes) available to the
user. In this example, the printer has a maximum of 780K RAM
available.
3
The amount of RAM (in kilobytes) currently available to the user.
In this example, there is 780K of RAM in the printer currently
available to the user.
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