Template: SIM820X-M2-5G-FAQ
FAQ
{{{5}}}
AT+CNBP? //(you can copy the band to notepad) backup band AT+CNBP=0x100600000FC00000,0x00000000000000460000A7E2BB0F38DF,0x0000000000000000,0x00000000003FFE63000681E2090828D7. 0x00000000003FFE63000681E2090828D7 //assign the band to SIM820X or AT+CNBP=0x100600000FC00000,0x0000000000000046000001E2000908DD,0x00000000000000000000,0x00000000000000007042000081A0080808D7. 0x00000000000070000000010000000000 //give the frequency band to SIM820X AT+CNMP=71 // Fixed 5G
{{{5}}}
It may be that the APN is not acquired, generally, the APN is able to be acquired automatically, some areas (IoT cards) need to be acquired manually, for example, can be set by the following instructions:
AT+CGDCONT=1, "IP", "APN" // different operators APN is different, here the APN is changed to the corresponding operator
You can check the APNs of major carriers at the following websites: APN Search Website
{{{5}}}
- The default is to use SIM card 1, it may be switched to SIM card 2, please use the following command to switch to SIM card 1:
AT+SMSIMCFG=1,1
- Or directly switch to SIM card 2:
AT+SMSIMCFG=1,2
- If it still doesn't work, consider that the airplane mode is turned on, and use the following command to turn off the airplane mode:
AT+CFUN=1
Question: What should I do if the SIM820X module NDIS dial fails and the driver cannot be installed?
- You can program the newest Raspbian system and reconfigure NDIS dial-up.
- Also, you can use the pre-configured image.
{{{5}}}
In this case, the network connection may not be successful. Follow the steps below to troubleshoot:
1. First confirm the hardware problem:
- Check whether the connected SIM card can communicate and surf the Internet normally on mobile phones and other devices:
- Check whether the antenna is connected properly;
- Check that the NET light is flashing, and it is always on, indicating that it is not registered to the network
2. After confirming that the hardware is OK, you can use the following command (AT LOG) to further confirm the network situation:
*Check the firmware version information: AT+SIMCOMATI *Check if the sim card is in good contact: AT+CPIN? *Turn the radio on (turn off airplane mode): AT+CFUN=1 *Check that the network mode is set to auto-seek: AT+CNMP=2 *Check the signal quality of the current environment: AT+CSQ *Check if the registration to the network is successful: AT+CGREG? *Check internet connection: AT+CPSI? *Check if the APN corresponds to the operator of the SIM card: AT+CGDCONT? *Check operator access: AT+COPS?
{{{5}}}
- After confirming that the SIM card is normal and the local 5G network is covered, follow the steps below to fix 5G (to increase the network speed).
AT+CNBP? //(Can copy the frequency band to Notepad) Backup frequency band AT+CNBP = 0x100600000FC00000, 0x000000000000000046004600001e2000908dd, 0x00000000000000000000000000000070420081a00808d7, 0x0000000000000000000000 // AT+CNMP=71 // Fixed 5G
- The 5G operator's SIM card frequency band should cover the SIM820X frequency band; sometimes the 4G network is queried, and the speed has reached 5G. You can directly measure the speed to confirm that the 5G network speed is available.
- To confirm whether the test environment has 5G network coverage, you can install Cellular-Z on a 5G mobile phone (all major app stores can download it) to view the detailed network information:
- Apple phones can follow the following steps to obtain band information:
- Open the phone dialer, enter *3001#12345#*, then click the dialer button.
- In the pop-up page, first, find and click "Serving Cell Info", then find and click "Freg Band Indicator.
- Check according to the table issued by the operator, and you will know.
{{{5}}}
- It is recommended to use the more convenient RNDIS dial-up.
- You can burn the latest Raspberry Pi Raspbian system and reconfigure the NDIS dial-up.
- Or you can use the image of the RNDIS dial-up with drivers already configured and boot the Raspbian system image (with drivers installed).
{{{5}}}
AT+CSYSSEL="nr5g_band",41:78
{{{5}}}
{{{5}}}
{{{5}}}
{{{5}}}
{{{5}}}
The following commands can be used to save the SMS to the module memory:
AT+CPMS="MT"
{{{5}}}
at+voltesetting=1 at+cnv=/nv/item_files/modem/mmode/ue_usage_setting,1,01,1
The VOLTE function can be turned off with the following command:
at+voltesetting=0 at+cnv=/nv/item_files/modem/mmode/ue_usage_setting,0,01,1
{{{5}}}
- Insert the GPS antenna into the GNSS antenna holder (SIM8200EA is ANT5; SIM8202G is ANT2), and place the receiver in the open outdoors (note that the test cannot be done in rainy weather), the power needs to wait for about 1 minute before the positioning signal is received;
- M2 module needs a passive antenna to obtain positioning information, if you do not have a passive positioning antenna, the matching 5G antenna is also available, replace the 5G antenna and put the module into outdoor positioning (the 5G antenna does not come with an extension cable)::
{{{5}}}
USB, Raspberry Pi runs "sudo. /install" will load the USB driver, and we connect communication with a 3B/4B USB connector. According to the tutorial, you can load the USB driver on Windows, and it will display as an unknown device when there is no driver.
{{{5}}}
{{{5}}}
{{{5}}}
After prolonged operation, the lubricating oil in the rolling bearing fan may evaporate, leading to increased noise. This is a common phenomenon with rolling bearing fans and does not indicate a malfunction of the fan.
{{{5}}}
We use the RTL8125 network port solution.
Theoretically, RTL8125 supports 2.5G, but it depends on the 5G module and the network condition of the test environment.
{{{5}}}