MC55 AT Command Set
10.18 ATS0 s
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MC55_ATC_V01.05 Page 277 of 469 2/10/04
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• If a network request for PDP context activation is answered automatically and another AT command is issued
at the same time on the same interface then this AT command will not be executed. Any response belongs
to the automatic context activation procedure. If the AT command which caused the collision was a CS data
call, the CONNECT response does not belong to this data call but to the GPRS. This can be detected if ATX
is not set to 0. CS data call will issue CONNECT <text>, GPRS will issue CONNECT only.
• A network request for PDP context activation has a maximu m duration of approximately 40 seconds (for
details see GSM 04.08). A RING/CRING URC is issued every 5 seconds, so setting parameter <n> to values
greater than 7 will not allow a successful context activation and is not recommended.
• The automatic GPRS attach will not be performed on recalling a stored user profile with ATZ or on p owerup,
if a n > 0 setting was stored in the user profile with AT&W.
• If the automatic GPRS attach fails (e.g. the network rejects the attach request), the w rite command returns
with error, but the value of <n> is changed anyway. This is necessary because ATS0 is used for circuit
switched calls too (see ATS0).
• ATS0 write command is PIN protected.