Northern UTA220/UTA220k - Manual (Page 107)

UTA220/UTA220k
12-31
D-Channel X.25
Parameter 19: Editing PAD Service Signals
Parameter 19 specifies whether editing service signals for the
character delete (parameter 16) and line delete (parameter 17)
are transmitted to the local DTE, and also specifies their
formats. The line display (parameter 18) service signal is
transmitted to the local DTE device, regardless of the
parameter 19 setting.
For different local DTE devices, different editing service
signals must be transmitted to the local DTE device. For
example, a display terminal can display the character delete
service signal as BS SP BS, which backspaces the cursor over
the character to be deleted, inserts a space, and then moves the
cursor back to the deleted character position. Because a
printing terminal is not capable of physically removing the
character to be deleted, the character delete service signal
displays as a slash (/) on the printing terminal device. If
parameter 6 (control of PAD service signals) is disabled, the
value of parameter 19 is ignored.
Note: None of the service signals are transmitted to the local
DTE display device if there are no characters stored by the
PAD or parameter 6 is set to 0.
*default
Table 12-25: Editing PAD Service Signals
Value Description
0 No editing PAD service signals. Line display service signals are
transmitted to the DTE
1 For edit character, the corresponding service signal is transmitted to
the DTE printing device:
Edit Character Service Signal
Character Delete /
Line Delete XXX CR LF
2 For edit character, the corresponding service signal is transmitted to
the DTE display device: *
Edit Character Service Signal
Character Delete BS SP BS
Line Delete Transmit total character number
of BS SP BS
Line Display Display of last line of characters