Wiki source code of Debug NB-IoT Connection
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| author | version | line-number | content |
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6.1 | 1 | = **For BC95-G** = |
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1.1 | 2 | |
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7.4 | 3 | ---- |
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7.1 | 4 | |
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7.4 | 5 | |
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7.2 | 6 | (% style="color:blue" %)**1. Check the reason why you can't access the network:** |
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1.1 | 7 | |
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7.6 | 8 | (% style="color:#037691" %)**1) AT+CEREG=5** |
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1.1 | 9 | |
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7.6 | 10 | (% style="color:#037691" %)**2) AT+CEREG?** (%%) ~/~/ This process may be longer, please repeat the input |
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1.1 | 11 | |
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7.7 | 12 | (% style="color:#037691" %)**3) Mainly check the two parameters **(% style="color:red" %)**cause_type and reject_case** |
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1.1 | 13 | |
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6.1 | 15 | [[image:image-20220530093747-3.png]] |
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1.1 | 16 | |
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6.1 | 17 | |
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7.2 | 18 | (% style="color:blue" %)**2. Network access operation:** |
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6.1 | 19 | |
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7.7 | 20 | (% style="color:#037691" %)**1) AT+CFUN=0** |
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1.1 | 21 | |
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7.7 | 22 | (% style="color:#037691" %)**2) AT+NBAND=X** (%%) ~/~/ X means the local frequency band number |
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1.1 | 23 | |
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7.7 | 24 | (% style="color:#037691" %)**3) AT+NRB** |
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1.1 | 25 | |
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7.7 | 26 | (% style="color:#037691" %)**4) After waiting for a period of time, you can use **(% style="color:red" %)**AT+CSQ **(%%)**to query the network access** |
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1.1 | 27 | |
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7.3 | 28 | |
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6.1 | 29 | [[image:image-20220530093821-4.png]] |
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1.1 | 30 | |
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7.2 | 32 | (% style="color:blue" %)**Remarks:** |
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6.1 | 33 | |
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7.7 | 34 | ~1. The operating voltage of the SIM card used must be less than 3.0V. |
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1.1 | 35 | |
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7.7 | 36 | 2. The network access time varies with the signal strength. |
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1.1 | 37 | |
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7.7 | 38 | 3. If you have not been able to access the network, please try to access the network manually. |