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5.3 NV memory
This printer has NV memory (Non-volatile). The data of NV memory remains after you turn off the
power. The NV memory is available in two ways.
1. NV Bit-image
Please refer "NV Bit-image Printing" (page 5-7) for detail of the function.
2. User NV memory
There is free area in the NV memory that the user can use. You can use this free area for notations, to
write other character information, or for many other purposes. The data remains after you turn off the
power. Use ESC/POS commands to read and write this data. The following are examples of purposes.
•
Date of the printer for maintenance
•
ID definition for developer or POS system
Note
When you use User NV memory area by using OPOS or APD, you have to use "Direct I/O method" or
"Control A font." Please contact EPSON or your dealer for details.
Note the following when writing to and erasing NV memory.
❏ The following restrictions apply when performing NV memory operations (including data storage
and deletion).
•
The paper FEED button 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 enabled.
❏ The printer sometimes enters the Busy state while data is written to NV 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.
❏ Frequent use of the functions for defining data to and deleting data from NV memory can damage the
memory. As a rule in using the various commands, avoid writing to NV memory more than a 10 times
per day.
TM-U330 Technical Reference Guide
Application Development Information 5-6
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