iTherm
®
280 Programmer’s Guide ITherm® 280 File System
28-07764 Rev C Page 287
Function Read File command. All
ASCII [ESC] [RS] R <L
L
><L
H
>
Hexadecimal 1BH 1EH 52H
Decimal <27> <30> <82>
Description The [ESC] [RS]R command requests that data be read from the file and returned
to the host.
The <LL><LH> parameters specify the length of data that should be returned where LH * 256 +
LL specifies the number of returned bytes. The data is treated as binary data
with no translations. If there is not enough data in the file to make up the
requested length, only the available data is returned.
Function Generate and return a file directory report. All
ASCII [ESC] [RS] I
Hexadecimal 1BH 1EH 49H
Decimal <27> <30> <73>
Description The [ESC] [RS]I command requests that a formatted text directory be returned
from the printer. Each line is null terminated.
Function Erase all files in a partition All
ASCII [ESC] [RS] X <p>
Hexadecimal 1BH 1EH 58H
Decimal <27> <30> <88>
<p> selects the partition. 0 = System, 1 = User.
Description The [ESC] [RS]X command requests that the selected partition be reformatted.
Reformatting the system partition <0> is not recommended, as it will erase all
fonts and render the printer unusable.
Function De-fragment the file system. All
ASCII [ESC] [RS] F
Hexadecimal 1BH 1EH 46H
Decimal <27> <30> <70>
Description The [ESC] [RS]F command forces the file system to go through the file system
and clean up deleted file sectors. All sectors flagged for deletion are actually
erased and consolidated when this command is issued.
File space is not necessarily freed up by a file delete. Sectors may be marked
for deletion but still be present but inactive in the file system. These sectors take up
flash space. Each cluster has a fixed number of sectors, and if the number of deleted
sectors in a cluster exceed a predefined threshold, the cluster is de-fragmented
automatically. This command forces all clusters to be de-fragmented.
