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Chapter 15: User Commands
This chapter concentrates on the AT commands and S-Register settings that
affect the dialing characteristics of your ISDN TA/V, as they are effected from
your computer or terminal. The existing setting for an S-Register can be
displayed using the
ATS
n
?<CR>
command (where
n
is the S-Register number
you are interested in).
The factory configurations have been designed so that appropriate settings
for these commands are determined for you; however, if you need to alter any
of them simply reference the appropriate command within this chapter and
alter the ISDN TA/V’s configuration accordingly. The settings of Factory 0
are shown in bold type with all other variants being shown in plain text. The
AT
prefix and
<CR>
suffix required when commanding the ISDN TA/V to
alter a setting are omitted.
15.1 Selecting AT or V.25bis Dialing Commands
Whether your ISDN TA/V will accept AT or V.25bis dialing commands is
dependent on the setting of the
&M
or
&Q
command (see
Section 14.1
).
Factory configurations 0 and 2 are configured to accept AT commands, while
Factory 1 and 3 are configured to accept V.25bis dialing commands.
15.2 Defining the AT Escape Sequence Character Key and Response Timeout
The AT escape sequence characters are used to interrupt data flow and force
the DTE interface into command mode, as described in
Section 11.5
. The
ASCII value of the character is held within S-Register S2 and can be altered
using the command
S2=n
where
n
is a value from 0 to 127.
Entering a value greater than 127 will disable the escape sequence, in which
case your ISDN TA/V cannot be instructed to return from data mode to
command mode until the call is disconnected.
The default setting for the escape character is
S2=43
, 43 being the ASCII
value of the + character.
15. User Commands
