Northern UTA220/UTA220k - Manual (Page 105)

UTA220/UTA220k
12-29
D-Channel X.25
default = ASCII decimal value 8 character BS
Note: Do not substitute a displayable ASCII character to
initiate character delete. When used, a displayable character
delete will delete both the initiating character and the object
character. However, the monitor will continue to display the
object character.
Parameter 17: Line Delete
Parameter 17 specifies the line delete character. When the PAD
receives the line delete character from the local DTE device,
the PAD deletes the entire last line of characters contained in
the PAD buffer that were transmitted to the PAD by the local
DTE device. If service signals can be transmitted by the PAD
(parameter 6 is not set to 0), the PAD transmits a line delete
service signal to the local DTE device. This deletes the entire
last line of characters from the DTE device’s display. The
format of the line delete service signal varies depending on the
type of DTE device. Parameter 19 specifies the format of the
line delete service signal for different DTE devices. Receipt of
the line delete character is valid when the PAD is in the PAD
data transfer mode and editing (parameter 15) is enabled, or
the PAD is in the PAD command mode.
The function priority for duplicated characters (because of
duplication of parameter assignments) follows the order of
priority listed in the priority table provided for parameter 3.
Older DTE devices may not issue the character CAN (18H) for
line delete as expected. Parameter 17 must be set according to
the line delete character the DTE device is transmitting to the
PAD.
Table 12-22: Character Delete
Value Description
0 to 126 One decimal character from the ASCII Character Table is used as
the delete character (refer to Appendix F). If parameter 16 is set to
8, the character backspace (BS) can be used by the user to delete
the last character stored in the PAD (i.e., the last character the PAD
received from the local DTE).
127 Character DEL is used as the character delete character