User`s manual

THEORY OF OPERATION
AXIS AX-3 Cobra+ Technical Reference 32
EBCDIC
National
Coded-To-EBCDI
C International
Set 5
SCS characters are coded in EBCDIC (Extended Binary-Coded Decimal Interchange
Code) of which a number of national dependent versions exist. The protocol converter
internally works with EBCDIC International Set 5 (see section 11, page 132) and of
this reason, all printable characters ($40 - $FF) coming from the IBM system are
translated to International Set 5.
EBCDIC
International Set
5-To-ASCII
After a printable character has been translated to International Set 5, it is normally
translated to the equivalent ASCII character.
Extended
Emulation
Some predefined printable characters (see Section 4, page 35) can be used to process
non-IBM functions. These characters are not translated to ASCII, but used to control
Extended Emulation Mode.
SCS Emulation During normal operation the protocol converter emulates an IBM printer, i.e. it not
only translates EBCDIC characters to ASCII, but it also translates SCS control codes to
ASCII data sequences.
Printer Driver The Printer Driver is a subset of the parameter list (see Section 8, page 77 and Section
9, page 79) which contains all ASCII sequences that are used by the SCS emulation to
translate SCS control codes to ASCII data.
Output Driver The output driver transfers the ASCII character codes and control commands to an
attached printer using either the parallel (centronics) or serial (RS-232)* interface. The
interface type is automatically determined by the type of printer cable installed. The
output driver also controls the PC-host sharing feature*.
* Does not apply to the AXIS 330 Cobra.