Northern UTA220/UTA220k - Manual (Page 104)

12-28
UTA220/UTA220k
D-Channel X.25
Parameter 15: Editing
Parameter 15 specifies whether editing of the currently stored
PAD data characters is allowed while in the data transfer mode.
Once the PAD data characters are forwarded, they can no
longer be edited. Parameter 15 applies only to the data transfer
mode because editing is always allowed in the PAD command
mode (i.e., the PAD command can be edited before the user
issues the PAD command delimiter carriage return or +
character). Three editing functions are available:
• Character delete
• Line delete
• Line display
*default
Note: The editing characters are specified by parameters 16,
17, and 18. Parameter 19 specifies the response to the editing
character by the PAD.
Parameter 16: Character Delete
Parameter 16 specifies the character delete character. When
the PAD receives the character delete character from the local
DTE device, the PAD deletes the last character contained in
the PAD buffer (the last character received from the DTE). If
service signals can be transmitted by the PAD (parameter 6 is
not set to 0), the PAD transmits a character delete service signal
to the DTE. The purpose of the character delete service signal
is to delete the last character from the DTE device's display
line. The format of the character delete service signal varies
depending on the type of DTE device. Parameter 19 specifies
the format of the character delete service signal for different
DTE devices. If the PAD is in the PAD data transfer mode and
editing (parameter 15) is not enabled, the character delete
character is ignored by the PAD.
The function priority for duplicated characters (because of
duplication of parameter assignments) follows the order of
priority as specified for parameter 3.
Older DTE devices may not issue the character BS (08H) for
character delete as expected. Parameter 16 must be set
according to the character delete character the DTE device is
transmitting to the PAD.
Table 12-21: Editing
0 Editing disabled in data transfer
1 Editing enabled in data transfer *