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6287 ULTRA Users ManualPage 11-4
Trigger 1 + Count Byte PTM
In the one-trigger mode, the user selects the trigger using any single
character that is not commonly found in the printable data stream (see
Section 5 Configuration Options and refer to Options 32 and 34 for
information on restrictions on the selection of triggers). The default trigger
is a cent sign (¢).
The one-trigger mode requires a count byte following the trigger that tells
the ULTRA how many pairs of additional characters will follow the count
byte (the count byte is not included in the count).
To send 1 ASCII escape character requires five input characters the
trigger (¢), the hexadecimal count byte (01h) and the hexadecimal ASCII
escape character (1Bh):
¢011B
To send the Xerox 4045 reset sequence requires nine characters the
trigger (¢), the hexadecimal count byte (03h) and the hexadecimal reset
sequence (1Bh, 2Bh and 58h):
¢031B2B58
MD-Laser Pseudo Transparency
The ULTRA is capable of supporting continuous escape, a form of
pseudo transparency offered in Maersk Data products. It is triggered by
SCS Trigger 1 (see Option #34) followed by C2h. If Option #55 is set to
Yes, when this sequence is detected in the data stream, the ULTRA will
pass the subsequent hexadecimal pairs of data to the printer without
translation until terminated when SCS Trigger 1 is encountered again.
Spaces and control codes in between the Trigger 1 characters are ignored.
When in use, the ULTRA begins checking for valid pairs of hexadecimal
characters. When the ULTRA detects an asterisk, it combines the two bytes
prior to the asterisk to form a count byte, and it combines the two bytes
after the asterisk to form a repeat byte. The ULTRA then sends out the
repeat byte to the printer the number of times indicated by the count byte.
This provides some compression of graphic data.