J.P. SELECTA ST DRY PV 12 Manual De Instrucciones página 42

yL, yH, the printer processes xL, xH, yL, yH out of the defined range.
The d indicates the definition data. In data (d) a 1 bit specifies a dot to be printed
and a 0 bit specifies a dot not to be printed.
The definition data for an NV bit image consists of [xL xH yL yH d1...dk].
Therefore, when only one NV bit image is defined n=1, the printer processes a data
group [xL xH yL yH d1...dk] once. The printer uses ([data: (xL
8 [header :4]) bytes of NV memory.
256)  ] 
Once an NV bit image is defined, it is not erased by performing ESC @, reset, and
power off.
This command performs only definition of an NV bit image and does not perform
printing. Printing of the NV bit image is performed by the FS p command.
[Notes] Frequent write command executions by a NV memory write command
may damage the NV memory. Therefore, it is recommended to write the NV
memory 10 times or less a day.
3.28【Print NV bit image】
[Format] ASCII
Hex
Decimal
[Range] n
0 
[Description] Prints NV bit image n using the mode specified by m.
m Mode
0 Normal
3 Quadruple
n is the number of the NV bit image (defined using the FS q command).
m specifies the bit image mode.
FS p
1C 70
28 112
255；

Vertical Dot Density
203.2 dpi
101.6 dpi
n m
n m
n m
dpi: dots per 25.4 mm {1"}
Horizontal Dot Density
xH
  256) (y  y
L H
203.2 dpi
101.6 dpi
42
