• Execute autoreconf -vfi, and then recompile, see the figure below:

Please confirm that there is a sim7600_4G_hat_init file in the current path The general operation is: download the sample program, after decompression, rename the c folder under the Raspberry folder to SIM7600X, and then copy the entire SIM7600X folder to the Raspberry Pi /home/pi directory, Enter the command line into the /home/pi/SIM7600X directory, and then execute the chmod 777 sim7600_4G_hat_init command.

1. Pay attention to check the device manager, the upgrade process will prompt the new device inserted, and the first upgrade will not have a device driver; 2. Pay attention to the USB cable, the USB cable rate is high during the upgrade process, so you need to choose a better quality USB cable to avoid poor contact. 3. Need to run the upgrade tool with administrator privilege (SIM7500_SIM7600_QDL V1.41 only for Update). 4. Uninstall and reinstall the update tool (SIM7500_SIM7600_QDL V1.41 only for Update).

You can refer to two ways, the detailed steps refer to the following:

• How to turn a Raspberry Pi Zero W into a 3G 4G router

The new driver may not be compatible with some WIN7 systems, you can try the old driver:

• SIM7600 old driver

• SIM7600 new driver

• 1. Download the driver.

• 2. Connect the 4G HAT to a Windows computer as shown in the hardware connection diagram above (Windows 10 OS is used as an example below)

• 3. Make sure the module has been powered on properly: refer to the previous section "Switching on and off the module"

• 4. Open Device Manager->Other Devices->"SimTech, Incorporated "-> Update Driver -> Browse My Computer to find the driver file -> According to the system, select the path where the driver file is stored -> Installation is complete.

• 5. Install all the recognized devices and drivers:

• Make sure your system kernel is above 5.4. Do not use sudo update to upgrade the Raspberry Pi to the latest version, otherwise, the kernel version will be upgraded to a version higher than the current firmware and will not be recognized.

• It is recommended to use the more convenient RNDIS dial

• You can burn the latest Raspberry Pi Raspbian system and reconfigure the NDIS dial-up

• Or use the image that has been configured with the driver NDIS dial-up self-starting Raspbian system image (driver installed)

Generally, it is the problem of baud rate, TTL level, and wiring, the details are as follows: 7600X_connect_Arduino

Use the following commands:

echo "4" > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio4/direction
echo "0" > /sys/class/gpio/gpio4/value
echo "6" > /sys/class/gpio/export
echo "out" > /sys/class/gpio/gpio6/direction
echo "0" > /sys/class/gpio/gpio6/value

Answer:As shown below:

1) /dev/ttyUSB0-diag port for output developing messages
2) /dev/ttyUSB1- NMEA port for GPS NMEA data output
3) /dev/ttyUSB2-AT port for AT commands
4) /dev/ttyUSB3-Modem port for ppp-dial
5) /dev/ttyUSB4-Audio port

The following command can be used to detect the presence of Qualcomm Qualcomm devices, and if a COM driver has been loaded (the Raspberry Pi system generally comes with it), a series of ttyUSB* will also appear:

lsusb
ls /dev/ttyUSB*

1. The AUX auxiliary antenna is a diversity antenna, the main antenna signal is not good enough to receive the signal with the receiving antenna, and the physical location is not the same, there is always a better, diversity antenna connected to the bandwidth and rate sensitivity will be increased by about 20%.

2. No diversity antenna can make the receiver obtain a maximum of not more than 3db diversity gain, but the diversity does not line any transmitting function, so to connect to the main antenna, transmit the signal to the base station registered to the network, the auxiliary antenna will only work.

Please put the jumper cap on C and connect the USB TO UART interface of SIM7600X to the USB port of a computer or Linux board such as Raspberry Pi through USB type to micro USB to send commands to debug:

• Frequency: 700m 800m 900m 1710-1920M 2010-2100M 2300-2400M 2500-2690M-5800MHZ

• Gain: 9dbi ± 0.7db

Open at the same time, average: 110~170mA

Using a USB 5V power supply, after successful networking, the current is generally in the range of 50~300mA, and the average is about 150mA (for reference only, depending on the network environment and networking status.

• Confirm whether the frequency band supported by the IoT card covers the frequency band supported by the module.

• APN is not set, please use the following command to configure APN.

• Note: Different operators' APNs is different, here the APN is changed to the corresponding operator.

• It may be blocked, high traffic (real-name IoT) cards are going to be machine card binding, and can only be used on a device (the State Ministry of Industry and Information Technology, Ministry of Public Security, issued to the operator must be so); you can let the IoT card operator check the status of the card and unlock the next.

This problem is generally caused by poor contact between the SIM card and the SIM card holder of the module.

Support SIM standard (Standard) card, as shown in the figure below, if it is a Micro or Nano card, you need to add a card sleeve.

• Confirming that the SIM7600X is registered to the network and that the SIM card can send and receive SMS messages properly on devices such as cell phones;

• Setting the correct SMS center number;

• Initialize the SMS settings with the following command:

AT+CSCS="IRA"
AT+CSMP=17,167,

AT+CSCA="+8613800755500"

The command should be added + enter to return OK.

If the short message is stored in the SIM card, the limit is generally 50. You can use the command: AT+CPMS? make an inquiry.

The VOLTE function can be enabled with the following command:

at+voltesetting=1
at+cnv=/nv/item_files/modem/mmode/ue_usage_setting,1,01,1

The VOLTE function can be disabled with the following command:

at+voltesetting=0
at+cnv=/nv/item_files/modem/mmode/ue_usage_setting,0,01,1

Note: The difference between Volte calls and regular phone calls: The network of Microsoft calls goes on a packet-switched Internet network. And ordinary phone calls take the circuit-switched (PSTN network) communication network. There is a fundamental difference between the two. By the time of 4G LTE, the packet network can control the delay to low enough, and ordinary phones can make calls directly through VOLTE with the packet network. However, in places where the network is poor, circuit-switched networks are still inseparable.

Common commands for the LBS base station positioning function of SIM7600X are as follows:

AT+CLBS=? //View the range of parameters that can be set
AT+CNETSTART//Open the network; if it fails to open the network, you can use the command AT+CNETSTOP to close and then open
AT+CLBS=1 //Get the current latitude and longitude
AT+CLBS=2 //Get the detailed address

After turning on the GPS in the AT debug serial port, turn on the NMEA port to get the dynamic information.

For more detailed steps, please refer to the following link. SIM7600X gets the latitude and longitude in units, we commonly use degrees as the unit, please see below for more details.

• SIM7600X Positioning_via_uSTAR

• SIM7600G-H_4G_for_Jetson_Nano_Precisely_Locates_in_Gaode_Map_API

• SIMXXX_Locates_My_Location_on_Gaode_Map

GNSS parameter problem, after restarting the module, initialize the GNSS parameters with the following command can be;

AT+CGPSNMEA=197119

Or you can use the following commands to obtain the position information.

AT+CGPSINFOCFG=10,31

Insert the GPS antenna into the GNSS antenna holder and place the receiver label side down in the open outdoors (note that the rainy weather test can not), the power needs to wait about 1 minute to receive the positioning signal;

From left to right, they are (1) dimension, (2) longitude, (3) date, (4) time, (5) altitude, (6) speed, and (7) heading angle.

• Generally, the default configuration of SIM7600 is to automatically select the network standard, and it is likely to choose 2G Internet access; if you need to force the use of 4G mode, you need to enter the following AT command configuration:

AT+CNMP=38    //Fixed 4G LTE, if there is no local 4G coverage, you may not be able to register to the network

• If 4G has been fixed and the speed is still not ideal, it may be a frequency band problem;

AT+CNBP?  //Backup the current band (the returned band information can be copied to Notepad, etc.)

AT+CNBP=0x0002000000400183,0x000001E000000000,0x0000000000000021    //After returning to OK, measure the speed

AT+CNBP=0x0002000004400180,0x000001E000000000,0x000000000000003F   //If the speed doesn't improve, try this

AT$QCRMCALL=1,1

Answer:

• Under normal circumstances, SIM7600X has already dialed automatically when it is connected to the Windows system, no need to repeat the dialing, the repeated dialing will return NO CARRIER

• If you still cannot dial up, please use the following command to change to the Windows default dial-up mode

  Copy

  AT+CUSBPIDSWITCH=9001,1,1 

• The display is turned off and the mobile network is not enabled, you can ignore it and go online directly;

• You can also install the driver SIM7600X dial-up Driver to update the network card

• After installing the driver, the network card shows that it is enabled

Set up as below:

AT+CGDCONT=1, "IPV6", "APN" //Switch to IPV6, different operators APN is different, pay attention to distinguish the settings
AT+CGDCONT=1, "IP", "APN" //Switch back to IPV4

• Open the Raspberry Pi terminal and input the following commands:

sudo raspi-config
Select Interfacing Options -> Serial to turn off shell access and turn on the hardware serial port

Raspberry Pi 2B/zero, the user serial device number is ttyAMA0; you can use the following command line to confirm that serial0 is the selected serial device number, as follows:

ls -l /dev/serial*

The SIM7600X can send the following command plus carriage return, and successfully turn on the display after displaying OK.

ATE1

Differences as shown below:

• Linux dial-up:

  • Raspberry_Pi_networked_via_RNDIS

  • A7600X_RNDIS_Dail-up_Networking

  • SIM7600X_ECM_Dail-up

  • SIM820X_RNDIS_Dial-Up

  • NDIS_Dial-Up

• Windows dial-up:

  • Windows_NDIS_Dail-Up

  • Windows RNDIS_Dial-Up

In this case, it may be that you have not successfully connected to the network, you can follow the steps below to troubleshoot： 1. First check the hardware connection:

• Check if the MAIN antenna is connected properly；

• Whether the connected SIM card can communicate and surf the Internet normally on mobile phones and other devices：

• If the Raspberry Pi is connected, whether the module enters airplane mode;

2. After confirming that there is no problem with the hardware, the software can use these instructions：

• Check if the sim card is in good contact: AT+CPIN?

• Check if the network mode setting is correct: AT+CNMP?

• Check the signal quality of the current environment: AT+CSQ

• Check carrier access：AT+COPS?

• Check internet connection：AT+CPSI?

• Check for successful registration to the network: AT+CGREG?