Getting Started with HC15
Confidential / Preliminary
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3 Using the HC15 Module
The following examples show the basic steps required to register to the network, to select UMTS mode or GSM mode and to attach to HSDPA or GPRS.
The examples are based on a UICC card provisioned by the German network operator T- Mobile. The used UICC card is capable of UMTS and GSM and enables the subscriber to switch back and forth between both networks.
3.1AT Command Interpreter
AT commands can be entered on two interfaces of the HC15 module:
•Siemens HSDPA USB Com Port
•Siemens HSDPA USB Modem
Yet, we recommend that the Siemens HSDPA USB Com Port be used for controlling the HC15 module, eg. for entering AT commands and receiving URCs, while the Siemens HSDPA USB Modem is mainly intended for use as a modem. For greater detail refer to [1], especially the chapters “AT Command Interpreter” and “Unsolicited Result Code Presentation”.
As described in Chapter 2.5, each interface is assigned a virtual COM port of its own, which enables accessing the interface from the host application or, accordingly, the
| AT^SQPORT | On the AT command interface, the Siemens |
| Application | HSDPA USB Com Port is referred to as |
| OK | “Application”. |
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| AT^SQPORT | On the AT command interface, the Siemens |
| Modem | HSDPA USB Modem is referred to as |
| OK | “Modem”. |
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If you need to operate the HC15 from both interfaces at a time, bear in mind that both are handled by the same AT command interpreter. As a result, AT commands entered on both interfaces are not executed in parallel but sequentially, one after the other. So, an AT command issued on one interface will be buffered on this interface to be executed after the other interface has completed processing earlier AT command(s). The buffered command string is not echoed, but will be indicated when executed.
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