AC75 AT Command Set

s

 

SAP client

After RSA activation, the SAP client starts sending SAP CONNECTION_REQ messages (see Figure 15.4, SIM usage states of SAP client). The SAP client still uses its local SIM until an SAP server responds and the param- eter negotiation has been accomplished successfully. When the SAP client recognizes from the received ATR data that the SIM of the SAP server is appropriate and uses the the correct transmission protocols, it switches over to the server's SIM. Now, both sides start to exchange APDU data. If the APDU transfer was successful the SAP client is required to enter the SIM PIN. Finally, when the SIM PIN authentication has been completed, the SAP client can register to the cellular network - via the SIM inserted in the SAP server instead of its own local SIM.

Figure 15.4: SIM usage states of SAP client

AC75_ATC_V01.002

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Siemens AC75 manual SAP client