# Quectel BG770A-SN Satellite NTN Network
The Quectel BG770A-SN series supports IoT-NTN (satellite), LTE Cat M1/Cat NB2, and EGPRS, offering ultra-low power consumption. It complies with 3GPP Release 17 standards, ensuring optimal performance for advanced IoT applications
### Prerequisites
* Monogoto SIM
* [BG770A-SN](https://www.quectel.com/product/bg770a-sn-satellite-communication-module/)
### Quick Navigation
* [Set up EVB Kit ](#set-up-umts-and-lte-evb-kit)
* [Useful Links](#useful-links)
## Set up EVB Kit
#### Set up the EVB Kit
* **Connect the LTE antenna** and **GPS antenna**
* Insert the **Monogoto SIM**
#### **Connect your PC to the EVB Kit**
Use the USB to UART converter cable to connect your computer to the **COM1 MAIN** port of the EVB Kit
{% hint style="info" %}
When using Windows, [install the driver](https://files.gitbook.com/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M0mPxGpottOEfcucXOR%2Fuploads%2FDiNf9oe2RoYtpFrVIA8L%2FUSBMSER.zip?alt=media\&token=18d8a2f5-8e8e-47d2-a553-ddc9fe7653cd) using the disk or USB stick provided by Quectel.
{% endhint %}
Connect to the EVB kit (WCH USB-Serial **Ch** **A**) using a **terminal program**. You can use PuTTY for Windows, or screen, minicom, or miniterm for Mac or Linux.
Once the modem has started, it will report:
```
RDY
APP RDY
```
Enter `AT`, if the connection with the BG770A-SN modem has been established, the board will answer with `OK`.
## Connect the BG770A-SN to Monogoto
{% hint style="info" %}
Keep the **AT Commands manual** next to you for more details about the commands. [**Click** ](https://www.quectel.com/wp-content/uploads/2021/03/Quectel_BG95BG77BG600L_Series_QCFG_AT_Commands_Manual_V2.0-1.pdf)**here** to download the latest version.
{% endhint %}
#### **Reset the modem** to its default configuration:
Restore factory settings:
```
AT&F1
```
**Set the error reporting to** **verbose**, resulting in more descriptive error messages (optional):
```bash
AT+CEREG=2
```
Check the **status of the SIM card**. The correct response should be: `+CPIN: READY`
```
AT+CPIN?
```
{% hint style="warning" %}
If you receive an error, the SIM may not be inserted properly or the SIM is protected with a PIN. By default, Monogoto SIMs are not PIN protected.
{% endhint %}
### Query device information
Request the **product type, hardware,** and **firmware** **version**:
AT+QGMR
Example response: BG770ASNAAR02A01\_01.202.01.202
Request the **IMSI** (International Mobile Subscriber Identity):
```
AT+CIMI
```
Request the **ICCID** (Integrated Circuit Card ID), which is the identification number of the SIM card
```bash
AT%CCID
```
### Network Configuration
It is possible to let the modem select the network automatically.
**Set the APN to** `data.mono`:
```json
AT+CGDCONT=1,"IP","data.mono"
```
**automatically select modem**
The modem can be configured to automatically select the most appropriate band or region without manual intervention.
```
at+qcfg="band",0x0,0x0,0x0,0x7
```
{% hint style="info" %}
Although the modem may support many different NTN bands,
Band 23 = Canada
band 255 = L band Global (Taiwan, Australia, New Zealand, Japan)
band 256 = S band Europe
{% endhint %}
**Enable GNSS**
```
AT+QCFG="ntn/pos","ignss",1
```
**Reboot module**
```bash
AT+CFUN=1,1
```
**Disable** **radio**
```
AT+CFUN=0
```
#### Configure Radio Access Technology (RAT)
Configure the modem to only use NB-IoT NTN not LTE Cat-M1:
```
AT+QCFG="iotopmode",3,1
```
**Enable TA and SIB notifications**
```
AT+QCFG="ntn/ev","ta",1
AT+QCFG="ntn/ev","sib",1
```
**Send registration status**
```
AT+CEREG=2
```
**Enable** **radio**
```
AT+CFUN=1
```
Wait for a response::
```
+QCFG="ntn/ev","SIB31"
+QCFG="ntn/ev","TA","RACH",495,4982,190181
+QCFG="ntn/ev","TA","TAC",1,148,190360
+CEREG: 5,"07ED","002C480D",9
```
**Check the current network registration status**
```
AT+CEREG?
```
#### Query the signal measurement
request a specific network measurement, such as signal strength, noise levels, or other metrics:
```
AT%MEAS="8"
```
Example response: `%MEAS:Signal Quality:RSRP= -115,RSRQ= -15,SINR= -3,RSSI= -120.`
**Reports the information of serving cells**
```bash
AT+QENG="servingcell"
```
Example response:
+QENG: "servingcell","NOCONN","eMTC","FDD",901,98,2C480D,29,7699,255,1,1,7ED,-122,-8,-114,5,0
**Check the radio signal strength and signal quality:**
```bash
AT+CSQ
```
{% hint style="info" %}
`+CSQ` returns 2 values separated by a comma. The first value represents the **signal strength** and provides a value between 0 and 31; higher numbers indicate better signal strength. The second value represents the **signal quality** indicated by a value between 0 and 7. If `AT+CSQ` returns `99,99`, the signal is undetectable or unknown.
{% endhint %}
#### Validate if your device received an **IP address**:
```bash
AT+CGPADDR
```
Expected response: `+CGPADDR: 1,XX.XXX.XX.XXX`
{% hint style="success" %}
Do you see an IP address? **Congratulations! You’ve successfully connected the Quectel modem to Monogoto 🎉**
{% endhint %}
## Test the connection by sending a UDP payload
A UDP payload test when the modem has an active data connection with a Satellite.
**Send UDP Payload** to the IP address `34.192.142.126`:
```
AT%SOCKETCMD="ALLOCATE",1,"UDP","OPEN","34.192.142.126",7,12345
```
response:
```
%SOCKETCMD:1
OK
```
**Set and Active UDP Socket**
```
AT%SOCKETCMD="SETOPT",1,36000,1
AT%SOCKETCMD="ACTIVATE",1
```
response:
```
OK
```
**Send UDP Socket**
```
AT%SOCKETDATA="SEND",1,13,"48656C6C6F2C20776F726C6421"
```
response:
```
%SOCKETDATA:1,13
OK
%SOCKETEV:1,1
```
**info UDP Socket**
```
AT%SOCKETCMD="INFO",1
```
response:
```
%SOCKETCMD:"ACTIVATED","UDP","10.22.243.30","34.192.142.126",12345,7
OK
```
**Close UDP Socket**
```
AT%SOCKETCMD="DELETE",1
```
response:
```
OK
```
## Transition Between Satellite Network and Public Network
When transitioning between satellite and public networks using the Murata Kit use the following commands:
**Command for Switching to Public Network:**
```
AT+QCFG="iotopmode",0
```
This command activates the CAT-M mode for public networks, allowing the device to switch from satellite connectivity to a cellular public network.
**Command for Switching Back to Satellite Network**
```
AT+QCFG="iotopmode",3
```
This command activates the NBNTN mode, returning the device to satellite network connectivity.
## Useful Links
* [Quectel BG770A-SN product page](https://www.quectel.com/product/bg770a-sn-satellite-communication-module/#summary)
* [BG77xA-GL\_TE-B\_User\_Guide\_V1.1](https://files.gitbook.com/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M0mPxGpottOEfcucXOR%2Fuploads%2FKe7pzn2wZo0pf0wfsUzy%2FQuectel_BG77xA-GL_TE-B_User_Guide_V1.1.pdf?alt=media\&token=5c2ff9fe-c133-4568-9773-e805ee7e346c)