Epson SQ-2550 User Manual page 115

Data Dump Mode
Look at the data dump printout shown in Step 2. By comparing
the characters printed in the right column with the printout of
hexadecimal codes, you can check what codes are being sent to
the printer. If characters are printable, they appear as their true
ASCII characters. Nonprintable codes, such as control codes,
are represented by dots.
As an example of how to interpret a data dump printout, look
at the first three hexadecimal codes on the third line of the
printout sample (20 20 54). Each hexadecimal code (20)
represents a space, while the hexadecimal code (54) represents
the letter T. Check the third line of the right column and you
will find the letter T preceded by two spaces.
The chart below interprets part of the first line of codes:
Hex codes Command
1B 40 ESC @
1B 5200 ESC R0
1B 7401 ESC t 1
ESC 6
1B 36
12 DC2
lB 50 ESC P
ESC p 0
1B 7000
3-40 Using the Printer
Function
Initialize printer
Select USA character set
Select EPSON Extended Graphics character
Enable printable characters
Cancel condensed mode
Select 1O cpi
Cancel proportional mode