Nv Memory - Epson TM-L90 Developer's Manual

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NV Memory

The flash ROM of the printer can be roughly divided into 3 parts.
• Firmware program area
• NV memory area for product information. User cannot edit.
• NV memory area that user can access.
The following items are in the NV memory that the user can access.
a) Memory switches
(Msw1, Msw2, Msw8, Customize value such as the paper width, Serial communication
conditions.) : using command GS ( E
b) User NV memory : using command GS ( C
c) NV graphics memory : using command GS ( L, GS 8L
d) User defined code page (Page 255 (space page)) : using command GS ( E
e) Area of command default values specified by users : using command GS ( M
Changing those values, you can customize your printer.
Note the following when writing to and erasing to NV memory.
J The following restrictions apply when performing nonvolatile memory operations
(including data store and delete).
• The paper feed switch must not be used to feed paper.
• The real time command must not be executed.
• The ASB status will not be sent, even when the ASB function is set to enable.
J The printer will sometimes enter the Busy state when data is being written to nonvolatile
memory. It is important not to send data from the host computer while the printer is in the
Busy state as it will be incapable of processing any received data.
J Frequent use of the functions for defining data to and deleting data from nonvolatile
memory can damage the memory. As a rule, in using the various commands (certain
functions of the GS ( C, GS ( E, GS ( L, GS ( M and the GS g 0 commands), avoid writing to
nonvolatile memory more than a 10 times per day.
Rev. A
TM-L90 Developer's Guide
Application Development Information 4-7