Wiki source code of Debug NB-IoT Connection
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6.1 | 1 | = **For BC95-G** = |
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1.1 | 2 | |
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6.1 | 3 | **~1. Check the reason why you can't access the network:** |
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1.1 | 4 | |
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1.2 | 5 | 1) AT+CEREG=5 |
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1.1 | 6 | |
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1.2 | 7 | 2) AT+CEREG? ~/~/This process may be longer, please repeat the input |
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1.1 | 8 | |
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1.2 | 9 | 3) Mainly check the two parameters cause_type and reject_case |
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1.1 | 10 | |
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6.1 | 12 | [[image:image-20220530093747-3.png]] |
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1.1 | 13 | |
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6.1 | 14 | |
| 15 | **2. Network access operation:** | ||
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1.2 | 17 | 1) AT+CFUN=0 |
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1.1 | 18 | |
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1.2 | 19 | 2) AT+NBAND=X ~/~/X means the local frequency band number |
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1.1 | 20 | |
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1.2 | 21 | 3) AT+NRB |
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1.1 | 22 | |
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1.2 | 23 | 4) After waiting for a period of time, you can use AT+CSQ to query the network access |
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1.1 | 24 | |
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6.1 | 25 | [[image:image-20220530093821-4.png]] |
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1.1 | 26 | |
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6.1 | 28 | **Remarks:** |
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1.2 | 30 | ~1. The operating voltage of the SIM card used must be less than 3.0V |
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1.1 | 31 | |
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1.2 | 32 | 2. The network access time varies with the signal strength |
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1.1 | 33 | |
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1.2 | 34 | 3. If you have not been able to access the network, please try to access the network manually |