# 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) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.monogoto.io/getting-started/sim-cards/isim/quectel-bg770a-sn.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.