Command Interpreter and Character Sets 7-1
Command Interpreter and Character Sets
Emulations
Printers interpret the data they receive from the line in the form of special code sequences. If any of
these sequences are sent, the printer performs the function that it represents. There is no common
method of controlling data. The leading printer manufacturers have created their own control
"standards" according to the printing technology, applications to be used, etc. Other manufacturers
have adapted to these standards, by making printers that behave exactly like ("emulate") the original
printers; hence the concept of emulation.
To be compatible with various standards, a printer must be flexible and versatile. Your printer is
particularly so, as it can operate in several different emulations.
The printer with serial interface operates with a set of codes divided into separate areas:
• Epson TM-U950 emulation environment
• Epson TM-950 emulation environment
The printer with parallel interface operates with the set of codes Epson TM-U950P.
The Epson TM-U950 command set is the most complete and comprises all the commands of the
printer in its full configuration.
The Epson TM-950 (and TM-U950P) emulation ensure continuity with the past, for users replacing
their old Epson TM 950 with the new TM-U950.
Character Sets
In the character set, the firmware assigns a specific printable character to each byte of data. A
character set may contain up to 255 different characters. The first 128 characters (from code 0 to
127) are standardized and represent the USA ASCII character set, which excludes all the European
national characters and semigraphic symbols as well.
The assignment of codes 128 to 255 varies from one country to another, from one type of hardware
to another, from one operating system to another and often according to the application program
used. Before selecting a character set, read the documentation provided with your operating system
and application carefully.
The section "Printable character set tables" indicates the codes that correspond to the characters in
the resident character sets.
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