Getting Started with HC15
Confidential / Preliminary
s
3.5Selecting UMTS or GSM
The GSM 07.07 operator selection command AT+COPS has been enhanced to enable the subscriber to select whether to use UMTS or GSM. You can quickly switch back and forth between both network types while the ME remains registered.
Write command: AT+COPS=<mode>[, <format>[, <oper>[, <act>]]]
The parameter <act> (access technology) can take the values listed below. The parameter is stored
0GSM network
2UMTS network
Note: By factory default, an automatic network selection mode is set which enables the ME to select either UMTS or GSM, depending on the network coverage. This automatic mode remains enabled until you explicitly set either UMTS or GSM using the <act> parameter of AT+COPS. Setting the <act> parameter forces the ME to select either UMTS only or accordingly, GSM only. If the specified network is not available, the network registration will be disabled.
| at+cops? |
| Querying the current network mode. |
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| +COPS: | The ME is registered to the German |
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| OK |
| operator |
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| Selecting the GSM network. |
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| at+cops=0,,,0 | #(or at+cops=,,,0) |
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| OK |
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| at+cops? |
| Query the current network type. |
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| +COPS: | The response confirms that the ME has |
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| OK |
| changed to the GSM network. |
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| at+cops=0,,,2 | #(or at+cops=,,,2) | Selecting the UMTS network. |
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| OK |
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| at+cops? |
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| +COPS: |
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| OK |
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| at+cpin? |
| There is no need to enter the SIM PIN again. |
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| +CPIN: READY |
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OK
Furthermore, the command AT+COPS serves to query or specify several modes of selecting the GSM network operator. These functions are not discussed in this document.
HC15_startup_v01 | Page 17 of 31 |
