Signal Strength:99. CSQ:99,99
Version 8.1 by Edwin Chen on 2023/04/23 23:08
1. Issue Output
NB-IoT module can't connect to NB-IoT Network and Keep Showing Signal Strenght:99. Below is an example output:
2. What is Signal Strenght?
Signal Strength is same as AT+CSQ command output. When you run AT+CSQ and NB-IoT module return AT+CSQ=99,99. It means NB-IoT Sensor doesn't attached to the NB-IoT network. If attached to network, the first 99 should be 2~31.
Below is the definition for the AT+CSQ
CSQ Definition
3. What to check?
3.1 Check whether module detect the SIM card?
- Whether the antenna connection is good.
- Whether you use a valid SIM Card
- Whether you the SIM card place correctly.
- Whether the NB-IoT Network you use match the End Device Module support network.
- Whether you have select the correct band for your operator. See Specify_NB-IoT_Band