Specifications

Host Memory Status
Sending the ~HM (Host Memory Status) instruction to the printer
immediately returns a memory status message to the host. Use this
instruction whenever you need to know the status of the memory.
When the Host Memory Status Command, ~HM, is sent to the Zebra
printer, a line of data containing three numbers is sent back to the
Host. The information contained in that line is described here.
Memory Status Line
1024,0780,0780
The first value is the total amount of RAM (Random Access Mem-
ory) installed in the printer. This number is in Kilobytes. In our
example, the Zebra printer has 1024K RAM installed.
The second value is the maximum amount of RAM (Random Access
Memory) available to the user. This number is in Kilobytes. In our
example, the Zebra printer has a Maximum of 780K RAM available.
The third value is the amount of RAM (Random Access Memory)
currently available to the user. This number is in Kilobytes. In our
example, there is 780K of RAM in the Zebra printer currently available
to the user.
NOTE 1: Memory taken up by bitmaps is not excluded from the
memory currently available value. (Due to ^MCN.)
NOTE 2: Downloading a graphic image or saving a bitmap only
affects the 3rd value. The 1st and 2nd values will not change after
the printer is turned on.
ZPL II COMMAND REFERENCE 239
C
O
M
M
A
N
D
R
E
F
E
R
E
N
C
E
~H M