6530 Programmer's Guide

Block Mode Operation
6530 Programmer’s Guide 3-41
EM3270 Submode The Esc - m command is used to switch in and out of EM3270 submode.
This command exits EM3270 without invoking any reinitialization
procedure. Re-initialization must be specifically invoked through a mode
switch, or by an Esc q sequence.
The 6530 can be switched from EM3270 submode to either block or
conversational mode. For more details on switching to conversational
mode, see “Switch from block to conversational mode” on page 1-14.
Note Several escape sequences and cursor motion keys operate
differently in EM3270 mode than in other modes. See “EM3270
Support” on page 3-67.
Read Page This group of escape sequences causes the 6530 to transmit all or portions
of the selected page. These operations do not affect the current buffer
address. The actual data transmitted and the format of the data depends on
the submode in effect.
In nonprotect submode, the text transmitted consists of displayable data,
along with any video attributes specified by Esc 6 sequences (the attribute
character transmitted is 40H-based). Trailing spaces on a line are not
transmitted; a CR character is used to delimit lines. Each line on the page
is transmitted; if the entire line is blank, only a CR is sent. The following
example shows the general format of transmitted data:
displayable data (text for line 1)
.
.
.
Esc 6
attribute character (define video attributes)
displayable data (more text for line 1)
.
.
.
CR (end of nonblank data for line 1)
displayable data (text for line 2)
.
.
.
etc.