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Page 3-23CONFIGURATION
Note: In either trigger method, the only valid characters following the
trigger sequence are the numerals 0 through 9 and the letters A through F.
In the one-trigger method, all invalid characters are translated and printed
after exiting transparency mode. In the two-trigger method, any invalid
character acts as a terminator unless a terminator has been defined with
Option 68 or 69.
In the one-trigger method, the user selects the trigger, using any single
character that is not commonly found in the printable data stream (see
Options 63 and 65). The one-trigger mode requires a count byte following
the trigger that tells the ALLY PLUS how many pairs of additional
characters will follow the count byte (the count byte is not included in the
count). In the following examples, we use the cent sign (¢) as the trigger
character:
To send 1 ASCII escape character requires 5 input characters the trigger
(¢), the hexadecimal count byte (01) and the hexadecimal ASCII escape
character (1B):
¢011B
To send the Xerox 4045 reset sequence requires 13 characters the trigger
(¢), the hexadecimal count byte (05) and the hexadecimal reset sequence
(1B2B580D0A):
¢051B2B580D0A
In the two-trigger method, the user selects the trigger using any two
characters that are not commonly found together in the printable data
stream (see Options 63-66). In this method, no count byte is required.
Rather, all pairs of bytes following the triggers are combined until
terminated with an invalid character (valid characters are 0-9 and A-F).
Note: The system may insert an NL command (an invalid character) in the
data stream. This will terminate two-trigger transparency unless the
terminator is restricted to a specific invalid character with Option 68 or 69.
Option #67 gives the user the choice of printing or discarding the
terminator.
In the following examples, we use a cent sign (¢) and a dollar sign ($) as the
trigger sequence. Note that in the examples, a cent sign (an invalid
character) is also used as the terminator.
To send 1 ASCII escape character requires 5 input characters the first
trigger (¢), the second trigger ($), the hexadecimal ASCII escape character
(1B) and an invalid character/terminator (¢):
¢$1B¢