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Block Data Transfer
For example, a command status request for the integral printer followed by one for the
external printer, when the terminal handshaking is configured without DCI's to trigger the
status response. Only the most-recently received request will be responded to, because it will
overwrite any previous ones pending in the prioritized queue.
DC1 Trigger Reset
Receipt of a status request or an cCEc
d"
escape sequence resets the terminals cCDCl Received"
flag. As a result, when handshaking is selected, a DCl must be received before the response is
sent to the host computer, even if a DCl was sent before the request or escape sequence.
DC2 Transfer
When the DCl/DC2/DCl handshake is used, the DC2 character may be followed by cCending
characters". These characters are determined by the Li ne/Page(D) selection, on the Terminal
Configuration menu. When the Line/PageCD) field is set to «Line", the ending is CR (LF);
when set to CCPage", there are no ending characters sent with the DC2.
ENTER KEY DATA TRANSFERS
Data can be sent to the computer in multiple-character blocks by using the. key. The
1:1
key
can be used as a substitute for the. key by entering cCYes" in the RETURN= EHTER field of the
Terminal Configuration menu.
When the terminal is in Remote mode, pressing the. key sets pending a block transfer ofdata
from the workspace to the host computer. The keyboard is locked until the data transfer is
completed.
The data transmitted depends on the combination of terminal modes. The modes significant to
•
key data transfer are shown in figure 9-1.
In studying the following paragraphs, you should keep the following facts in mind:
• The data transfer is always terminated if a block terminator or a non-displaying terminator
is encountered.
• If the data transfer is terminated by encountering a non-displaying terminator, that ter-
minatormay or may not be cleared, depending upon the setting of the Cl earTerm field in the
Terminal Configuration menu, as follows:
ClearTermCK)
=
NO:
Do not clear the terminator.
ClearTermCK)
=
YES: Clear the terminator.
• Both the field separator and the block terminator are ASCII control codes and are selectable
on the Terminal Configuration menu.
9-6
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