6530 Programmer's Guide

Block Mode Operation
6530 Programmer’s Guide 3-47
For example, the following sequence reads an area starting at row 5,
column 5 and ending at row 10, column 10:
1BH ]$ $ ) )
In nonprotect submode, the Esc ] sequence functions exactly like the
Esc = sequence.
In protect submode, the Esc ] sequence reads all fields in the specified
area, regardless of whether their MDTs are set. This includes both
protected and unprotected fields.
Note In EM3270 mode, this sequence:
Stores nulls rather than spaces in the screen buffer.
A screen with no fields is treated as a single unformatted field. Data
may be keyed at any character position. This escape sequence
handles such a screen by transmitting any character position not
containing a null. These data are not preceded by a DC1 row column
sequence.
If there is no attribute at row 1, column 1, the last field on the screen
wraps around to include any characters preceding the first attribute
location on the screen. This command sequence handles such a field
by sending a DC1 command, followed first by a two byte address, then
the data at the bottom of the screen, and the data at the top of the
screen.
The video and data attributes of the last field on the screen are also
enforced for the positions at the top of the screen. This effectively
overrides the Set Video Prior (Esc 7) setting.
Read with Address All Extended (Esc - K)
The Esc - K sequence reads a specified area of the selected page with
extended addressing format as described in “Cursor and Buffer
Addressing” on page 3-13. The format for the escape sequence is as
follows:
Esc - start-row ; start-column ; end-row ; end-column K
where:
start-row and start-column are decimal numbers that
specify the beginning location for the area to be read (read start
address).