# SIMCom SIM7600 Series AT Command
## 連線步驟
1. 安裝minicom

sudo apt-get install minicom

2. 開啟4G模組通訊埠

sudo minicom -D /dev/ttyUSB2

3. 輸入at，若連接成功會答覆ok

at

## AT command
- AT+CNMP 選擇連線模式

|Mode|Description|
|:-------- |:--------:|
|0|Automatic|
|38|LTEOnly|

- AT+CNBP 指定啟用頻段

|Mode|Description|
|:-------- |:--------:|
|NCC (B1/B3/B7/B8/B28)|0x0000000000000000,0x00000000000000000000000000000000000000000000000000000000080000C5,0x0000000000000000|
|FCC (B2/B4/B5/B12/B66)|0x0000000000000000,0x000000000000000000000000000000000000000000000002000000000000081A,0x0000000000000000|
|Default|0x100200000EE80380,0x480000000000000000000000000000000000000000000042000007FFFFDF3FFF,0x000000000000003F|
- AT+CSQ 檢查網絡信號強度

|rssi|dBm|
|:-------- |:--------:|
|0|<= -113|
|1|-111|
|2~30|-109~-53|
|31|>= -51|
|99|not known or not detectable|
|100|<= -116|
|101|-115|
|102~191|-114~-26|
|191|>= -25|
|199|not known or not detectable|
|100~199|expand to TDSCDMA, indicate RSCP received|