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Data Dump Mode
The EX has a special feature that makes it easy for experienced
printer users to find the causes of problems. The hexadecimal (hex) or
data dump mode gives a printout of exactly what codes reach the
printer.
Enter this mode by turning on the printer while holding down the
FORM FEED and LINE FEED buttons
at the same time. Then, when you
run a program, either an application program or one you have written
in any programming language, the EX prints all the codes being sent to
the printer in hexadecimal format.
If the characters are printable, they appear in the column on the right
as their true ASCII characters, as shown below. Non-printable codes,
such as control codes, are shown in this column as a dot. The far left
column of the table contains four-digit line numbers.
The data dump above was made while writing this appendix. By
comparing the column of characters at the right with the printout of hex
codes, you can see that the capital A (for Appendix) in the third row,
was printed as 41. You can use the table of character codes (Appendix
B) to find out what character corresponds to each code.
If you look at the first character of the dump, you can see that the
ESC character appears in hex as 1B, and in the character column as a
dot. To find the command, look at the next character, 40 hex (@), and
refer to the numerical list of commands in Appendix B.
D-4
Problem Solving and Maintenance