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SARA-R4/N4 series - AT Commands Manual
UBX-17003787 - R09
10 V24 control and V25ter
Page 102 of 307
10.10 Return to on-line data state O
O
SARA-R404M SARA-R410M-01B SARA-R410M-02B SARA-R410M-52B SARA-R412M
Modules
SARA-N4
Syntax
PIN required
Settings saved Can be aborted
Response time Error reference
Attributes
full
Yes
No
No
-
10.10.1 Description
Causes the DCE to return to online data state and issue a CONNECT or CONNECT <text> (based on
command) intermediate result code on DTE. It is the complementary command to the escape sequence, or to
the other actions (DTR ON to OFF transition, see table in
) that cause the DCE to switch from
online data state to online command state.
ATO command is used to resume both circuit-switched and packet-switched data call. The resume is only
possible if the PPP L2 protocol is used.
10.10.2 Syntax
Type
Syntax
Response
Example
Action
ATO
<response>
ATO
CONNECT
10.10.3 Defined values
Parameter
Type
Description
<response>
String
•
CONNECT
•
NO CARRIER: the online data state cannot be resumed
10.10.4 Notes
• The command provides an error result code ("+CME ERROR: operation not allowed" if
is set to 2)
in the following cases:
o The DCE is not in online command state
o It is issued on a DCE different from the one in online command state
• In case of PSD call, any data from the network (downlink data) received by the DCE during the on-line
command state is discarded. This means that after the O command and on-line data state resume, any
possible data loss has to be recovered by upper layer protocols (e.g. TCP).
10.11 Escape character S2
S2
SARA-R404M SARA-R410M-01B SARA-R410M-02B SARA-R410M-52B SARA-R412M
Modules
SARA-N4
Syntax
PIN required
Settings saved Can be aborted
Response time Error reference
Attributes
partial
No
No
-
10.11.1 Description
Controls the decimal value of the ASCII character used as the escape character. A value greater than 127
disables the escape process, i.e. no escape character will be recognized. The escape sequence contains three
escape characters e.g. "+++".
10.11.2 Syntax
Type
Syntax
Response
Example
Set
ATS2=<value>
OK
ATS2=43
OK
Read
ATS2?
<value>
043