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ISDN TA/V
14. DTE Interface Commands
and S-Register Settings
This chapter concentrates on the AT commands and S-Register settings that
affect the link between the ISDN TA/V and your DTE. The existing setting
for an S-Register can be displayed using the
ATS
n
?<CR>
command (where
n
is the S-Register number you’re interested in).
The factory configurations have been designed so that appropriate command
settings 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.
14.1 Data Transmission Mode
Your ISDN TA/V can be used in a variety of transmission modes, enabling you
to connect to a range of operating environments. The required mode is
dependent on the computer or terminal to which the ISDN TA/V is attached,
as well as the system to which you want to establish a communica-tion link.
The command language used to instruct your ISDN TA/V is also governed by
the setting of this AT command.
Note that the
&M
and
&Q
commands have the same effect, and either can be
used.
&M0
or
&Q0
Asynchronous mode using the AT command
language.
&M1 or &Q1
Synchronous mode using the AT command
language. This mode requires a synchronous
interface card to be installed in your PC, supporting
both asynchronous and synchronous operation
through the same port. Commands are sent to the
ISDN TA/V asynchronously via the AT command
language. The ISDN TA/V automatically switches to
the synchronous state when a connection to a
remote device is established.
