# Quectel BG770A-SN 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 iSIM profile * [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 ![Quectel BG770A-SN modem](https://3922449203-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-M0mPxGpottOEfcucXOR%2Fuploads%2F8SpyJdJ5i021KPGJ074o%2FBG770kit.jpg?alt=media\&token=8edbe4da-747a-4219-b46b-9a88c0bc918f) #### Set up the EVB Kit * **Connect the LTE antenna** and **GPS antenna** #### **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 ``` ### 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 iSIM ```bash AT%CCID ``` Check the **SIM initialization selection policy** is currently using: ``` AT%GETCFG="SIM_INIT_SELECT_POLICY" ``` Expected response: `SIM_INIT_SELECT_POLICY:5`. The last digit indicates the Active SIM:\ 0 indicates **External (SIM card)**\ 5 indicates **Internal (iSIM)** ### Network Configuration It is possible to let the modem select the network automatically. **Set the APN to** `go.mono`: ```json AT+CGDCONT=1,"IP","go.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 ``` ## Test the connection by sending a PING A PING test can be performed to test if the modem has an active data connection with a mobile network. {% hint style="warning" %} When cellular modems are idle for a long period of time, cell towers might drop the data connection to save resources. Sending regular PINGs is a good method for testing the data connection, as well as for keeping the connection alive because the operator registers your device as being actively used. {% endhint %} **Send 5 PINGs** to IP address `8.8.8.8`: ``` AT+QPING=1,"8.8.8.8",5 ``` Example response: ``` +QPING: 0,"8.8.8.8",32,543,255 +QPING: 0,"8.8.8.8",32,396,255 +QPING: 0,"8.8.8.8",32,262,255 +QPING: 0,"8.8.8.8",32,299,255 +QPING: 0,4,4,0,262,543,375 ``` ## 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)