Specifications

MC55 AT Command Set
7.11 ATS0
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MC55_ATC_V03.03 Page 137 of 459 9/9/05
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7.11 ATS0 Set number of rings before automatically answering a call
This command determines the number of rings before automatic answering a call.
Syntax
Parameter Description
000
(&F)
Automatic answer mode is disabled.
001-255 Enable automatic answering after specified number of rings.
Notes
• This command works for MT data and fax calls.
• Autoanswering of CSD data and fax calls is supported on ASC0/Mux1 only.
• A CSD call will not be answered automatically if the module is in GPRS online mode. However, this is possible
in GPRS command mode. The application can detect a call by evaluating the RING line and distinguish to
change into GPRS command mode or stay in GPRS online mode until GPRS is available again. To answer,
to reject or to wait for automatic answering the incoming call the application has to switch into GPRS com-
mand mode.
• If <n> is set to higher values, the calling party may hang up before the call is automatically answered.
• The correlation between ATS7 and ATS0 is important.
Example: Call setup may fail if ATS7=30 and ATS0=20.
• Setting is local to the interface. It is allowed to have different settings on different interfaces. In such cases
the interface 'wins', which is idle and uses the smallest <n> value.
• The ATS0 write command is PIN protected.
• The command ATS0 is also used as GPRS compatibility command to answer automatically to a network
request for PDP context activation (for details see ATS0 for GPRS). When the write command ATS0 is issued
with <n> greater than 0, the ME will attempt to perform a GPRS attach if not yet attached and if configured to
do so (see AT^SCFG, parameter <gs0aa>). If the ME is not able to attach to the GPRS for more than 5 min-
utes, the write command returns "ERROR" or "+CME ERROR: unknown", although the ME continues trying
to attach.
The GPRS attach will not be performed on recalling a stored user profile with ATZ or on powerup, even though
a value <n> greater than 0 was stored in the user profile with AT&W.
Read Command
ATS0?
Response(s)
<n>
OK
ERROR
Write Command
ATS0=<n>
Response(s)
OK
ERROR
Reference(s) PIN ASC0 ASC1 MUX1 MUX2 MUX3 Charge  Last
V.250 § % % % % % ! ! !
<n>
(num)(&W)(&V)