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AC75 AT Command Set

15.1 AT^SRSA

AC75_ATC_V01.002 Page 420 of 569 10/30/06

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SAP message data format

[0] XSAP ATC/URC format

SAP messages are translated into ASCII coded strings and transmitted as

parameters of the AT^SRSM command and the "^SRSM" URC. When using a

Bluetooth modem with AT command interface for transmitting data, it is recom-

mended to choose the XSAP data format. Note that AT commands not related

to RSA shall not be used after RSA activation on the dedicated serial multi-

plexer channel.

1 SAP transparent binary format

SAP messages are transmitted as coded in the SAP specification. This data

format should be selected for transmitting SIM data to a Bluetooth stack which

is part of the application. The binary data will be exchanged transparently with

the ME. However, the SAP data format does not need ASCII character conver-

sion. As a result less data will be transferred and the SIM communication will

be faster.

Beacon period

0...[6]...100 Specifies the number of seconds the SAP client waits before sending the next

CONNECT_REQ message. A 0 value leads to a one-time connection request.

This parameter is applicable for SAP client activation only.

SAP disconnection type

This parameter is only applicable if <sapRole> equals 0.

Calls or active GPRS contexts via a remote SIM will be lost due to missing SIM access. Use of AT+CLCC is rec-

ommended to query call states before RSA deactivation.

0 Hold SAP role

SAP connection is going to be disabled. The AC75 remains in SAP mode and

is ready to (re)establish an SAP connection. If an SAP connection was ongoing

a URC "^SRSA: <devId>, <sapRole>, <connState>, <linkChange-

Cause>" with <connState>= 0 is issued.

• A server exclusively sends an SAP message DISCONNECT_IND (type

"Graceful") to the client.

• A client saves the SIM data temporarily held in the AC75's memory to the

remote SIM and sends the DISCONNECT_REQ message to the server. If

requested the client restarts sending CONNECTION_REQ messages. If a

local SIM is attached the AC75 will use it to register to the network until a

server offers its SIM again.

[1] Stop SAP operation

SAP connection is disabled and AC75 is forced to local SIM mode. A URC

"^SRSA: <devId>, <sapRole>, <connState>, <linkChangeCause>" with

<sapRole>= 0 and <connState>= 0 is issued.

• A server sends a DISCONNECT_IND message (type "Immediate") to the

client and returns to local SIM mode immediately. SIM data temporarily held

in the client's memory would be lost.

• A client exclusively sends the DISCONNECT_REQ message to the server.

Without saving temporarily held data to a remote SIM or waiting for

DISCONNECT_RESP the client immediately returns to local SIM mode.

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