Siemens MC55 manual Parameter Description

MC55 AT Command Set

10.5 AT+CGDATA

s

mobile

Parameter Description

<L2P>(str)

Layer 2 protocol to be used between the TE and MT.

[“PPP“]	layer 2 protocol PPP
“1“	layer 2 protocol PPP

<cid>(num)

Parameter specifies a particular PDP context definition. The parameter is local to the TE-MT interface and is used in other PDP context-related commands.

1...2

Notes

•If the MT is in dedicated mode, write command returns with "+CME ERROR: operation temporary not allowed".

•It is possible to leave the GPRS data mode and enter the command mode by using the V.25ter command

+++. By using the command AT+CGDATA again, the data mode is reentered. Which context is used to return to data mode, depends on the supplied parameter <cid>.

If no <cid> is specified, this is equivalent to using the V.25ter command ATO, which is usable for GPRS con- nections too. In this case the first context is used, which is active and which was already in data mode since it was activated (the internal context, which is used for GPRS connection without explicitely specifiying a con- text identifier, has the highest priority).

It ist possible, to use AT+CGDATA to enter the data mode for a context, which was not in data mode since it was activated. With ATO this is not possible.

MC55_ATC_V01.05	Page 252 of 469	2/10/04
Confidential / Released