Matrix Orbital GLK24064-16-1U - Manual (Page 34)

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8.7 Set and Save
Contrast Dec
Hex 254 145
FE 91
Contrast
Contrast
Immediately sets and saves the contrast between background and text. Although contrast can be changed using
the set command, it is reset to this saved value on start up. Default is 128.
Contrast 1 byte, contrast level from 0(Light) to 255(Dark)
5.9 Filesystem
9.1 Wipe
Filesystem Dec
Hex
ASCII 254 33 89 33
FE 21 59 21
■ ! Y !
Completely erase all fonts and bitmaps from a graphic display. Extended length of the command is intended to
prevent accidental execution. To ensure filesystem integrity, cycle power to the display after erasure.
9.2 Delete a File Dec
Hex 254 173
FE AD
Type ID
Type ID
Removes a single font or bitmap file given the type and unique identification number. Cycle power after deletion.
Type 1 byte, 0 for font or 1 for bitmap
ID 1 byte, unique identification number of font or bitmap to be deleted
9.3 Get Filesystem
Space Dec
Hex 254 175
FE AF
Returns the amount of space remaining in the display for font or bitmap uploads.
Response 4 bytes, number of bytes remaining in 32KB memory, LSB to MSB
9.4 Get Filesystem
Directory Dec
Hex 254 179
FE B3
Returns a directory to the contents of the filesystem. The total number and type of each entry will be provided.
Response variable length, 1 byte representing number of entries followed by 4 identification bytes for each entry
Table 27: Filesystem Identification Bytes
Byte 3 2 1 0
Description Size MSB Size LSB Type/ID Flag
Table 28: Extended Byte Descriptions
Size MSB most significant byte of the file size
Size LSB least significant byte of the file size
Type/ID MSB designates file type, 0 for font or 1 for bitmap, remaining bits indicate ID number
Flag a value of 0 indicates entry is not in use