Scanlab RTC 5 PC Interface Board - set_char_pointer

RTC
®
5 PC Interface Board
Rev. 1.9 e
10 Commands And Functions
410
innovators for industry
Ctrl Command set_char_pointer
Function stores the absolute start address of a command list in the internal management table for
indexed characters.
Call
set_char_pointer( Char, Pos )
Parameters Char Index of the indexed character whose starting address Pos should be entered
in the management table (as an unsigned 32-bit value, allowed range:
[0 … 1023]). The same applies as for the load_char command:
Char = character set number * 256 + ASCII number of the character
(character sets are numbered 0 to 3).
Pos Absolute start address as an unsigned 32-bit value;
allowed range: [0 … (2
20
–1)]
Comments • If
Char > 1023 and/or Pos > (2
20
–1), then the command will not be executed
(get_last_error return code
RTC5_PARAM_ERROR ).
•The set_char_pointer command can be used for referencing an indexed character. It
thereby becomes an indexed character that is protectable via save_disk/load_disk
and/or callable via the index.
• set_char_pointer can also be used to reference anew an indexed subroutine, character
or text string so that it can also be called via a second index. Here, it is preferable to use
the copy_dst_src command for index management.
• The start addresses of command lists that are to be referenced with set_char_pointer
can be queried via get_input_pointer before loading the command lists.
• set_char_pointer only stores starting addresses in the internal management table. An
indexed character only gains protection via a subsequent save_disk/load_disk
command.
•
Pos should not be an arbitrary address within a list. Instead, it should be the starting
address of an actually existing subroutine that was finalized via list_return and does
not contain set_end_of_list.
RTC
®
4  RTC
®
5new command
References load_char