Quectel BG770A-SN
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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.
Monogoto iSIM profile
Connect the LTE antenna and GPS antenna
Use the USB to UART converter cable to connect your computer to the COM1 MAIN port of the EVB Kit
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:
Enter AT, if the connection with the BG770A-SN modem has been established, the board will answer with OK.
Restore factory settings:
Set the error reporting to verbose, resulting in more descriptive error messages (optional):
Request the product type, hardware, and firmware version:
Example response: BG770ASNAAR02A01_01.202.01.202
Request the IMSI (International Mobile Subscriber Identity):
Request the ICCID (Integrated Circuit Card ID), which is the identification number of the iSIM
Check the SIM initialization selection policy is currently using:
Expected response: SIM_INIT_SELECT_POLICY:5. The last digit indicates the Active SIM:
0 indicates External (SIM card)
5 indicates Internal (iSIM)
It is possible to let the modem select the network automatically.
Set the APN to data.mono:
automatically select modem
The modem can be configured to automatically select the most appropriate band or region without manual intervention.
Enable GNSS
Reboot module
Disable radio
Configure the modem to only use NB-IoT NTN not LTE Cat-M1:
Enable TA and SIB notifications
Send registration status
Enable radio
Wait for a response::
Check the current network registration status
request a specific network measurement, such as signal strength, noise levels, or other metrics:
Example response: %MEAS:Signal Quality:RSRP= -115,RSRQ= -15,SINR= -3,RSSI= -120.
Reports the information of serving cells
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:
Expected response: +CGPADDR: 1,XX.XXX.XX.XXX
Do you see an IP address? Congratulations! You’ve successfully connected the Quectel modem to Monogoto 🎉
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:
response:
Set and Active UDP Socket
response:
Send UDP Socket
response:
info UDP Socket
response:
Close UDP Socket
response:
A PING test can be performed to test if the modem has an active data connection with a mobile network.
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.
Send 5 PINGs to IP address 8.8.8.8:
Example response:
When transitioning between satellite and public networks using the Murata Kit use the following commands:
Command for Switching to Public Network:
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
This command activates the NBNTN mode, returning the device to satellite network connectivity.
When using Windows, using the disk or USB stick provided by Quectel.
Keep the AT Commands manual next to you for more details about the commands. here to download the latest version.
