Display Data Stream—Chapter 6
267TE 2000
5250 Terminal Emulation Programmer’s Guide
Read Screen (Immediate)
Function
The Read Screen command sends the contents of the display to the host in
the same order information appears on the screen. For example, row 1
goes first.
Restrictions
This command must be the last command in the SNA chain, and CD
must be on. The terminal re jects the command when it is in the prehelp
error, posthelp error, system request, or SS message state. During transmis-
sion the keyboard is locked, but pending AID requests or Read commands
are retained.
Note: If the display supports a separate message line, and the message line
is selected, the command is rejected only f or the system request and SS
message states. The command is processed with the display in error state.
Format
The command takes the following f orm:
ESC Read Screen Command
Hex 04 Hex 62
Results
The contents of the entire display, including the attributes, is sent to the
host system just as it appears in the regeneration buffer (no formatting or
conversion is done). Cursor address and AID are not returned. This com-
mand does not clear either pending Read commands or AID requests. The
keyboard is temporarily locked. The following are unaltered:
S Annunciators
S Cursor location
S Modes
S Keying history
S Display contents
S Format table
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