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5.3 | 1 | = **Introduction** = |
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5.2 | 2 | |
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5.3 | 3 | ---- |
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5.4 | 5 | When you use NB-IoT module and run the command **AT+CSG=99,99**. It means the device doesn't attached to the NB-IoT network. If attached to network, the first 99 should be 2~~31. |
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1.3 | 6 | |
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1.4 | 7 | ((( |
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5.2 | 8 | Below is the definition for the (% style="color:blue" %)**AT+CSQ** |
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1.4 | 9 | ))) |
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1.3 | 10 | |
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4.1 | 11 | [[image:image-20220530094441-1.png]] |
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1.3 | 12 | |
| 13 | CSQ Definition | ||
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4.1 | 15 | |
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5.1 | 16 | |
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5.2 | 17 | (% style="color:red" %)**In this case, you can check:** |
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1.3 | 18 | |
| 19 | * Whether the antenna connection is good. | ||
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5.4 | 20 | |
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1.3 | 21 | * Whether you use a valid SIM Card |
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5.4 | 22 | |
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1.3 | 23 | * Whether you the SIM card place correctly. |
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5.4 | 24 | |
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1.3 | 25 | * Whether the NB-IoT Network you use match the End Device Module support network. |
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5.4 | 26 | |
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4.1 | 27 | * Whether you have select the correct band for your operator. See [[Specify_NB-IoT_Band>>doc:Main.Specify NB-IoT Band.WebHome]] |
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5.2 | 28 | |
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