SIM7600G-H-M2 4G HAT

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SIM7600G-H-M2 4G HAT
SIM7600G-H-M2 4G HAT






  • Supports dial-up, phone call, SMS, TCP, UDP, MQTT, HTTP(S), FTP(S), and so on.
  • GNSS positioning: GPS, Beidou, Glonass, Galileo, QZSS, LBS base station.
  • USB 3.1 port (USB 2.0 compatible) for connecting to PC, Raspberry Pi, or Jetson Nano host board to enable high speed 4G communication.
  • Onboard UART, PWR, and RST control pin, built-in voltage level translator, enabled via DIP switch, for use with hosts like Raspberry Pi or Arduino.
  • Onboard USB-C connector, enabled via switch, for connecting standalone power supply for the module, allows more loads, stable amd flexible power supply.
  • Onboard power supply on/off switch, reset button and LED indicator, easy to turn on/off the module or monitor the operating status.
  • Reserved 4x SMA to IPEX antenna interfaces, with pre-soldered 2x connectors for easily using antennas, allows changing the SMA antenna position.
  • Onboard audio jack and audio decoder, allows audio operation like making phone call.
  • High efficiency power supply circuit, up to 3A output current.


  • In addition to the MICRO USB cable LTE antenna GPS antenna, the user needs to prepare the following things before using the module:
1 x 4G SIM card (4G-enabled and GPRS mobile phone card);
1 x earphone with microphone (optional);
1 x USB TO UART module (optional);
  • In the case of power off, insert the activated 4G SIM card, the headphone cable with microphone (optional), and then connect the USB cable to the computer.
  • Connect one end of the micro USB cable to the USB interface of the PC, and the other end to the USB interface of the SIM7600G-H-M2 4G HAT, the PWR light is on, and the NET light is off.
  • When you see the NET light starts flashing every second, the module starts to work.
  • Turn the TX and RX of the DIP switch to the ON side, connect to the computer and other equipment through the USB TO UART module, and perform AT command to debug on the corresponding COM port. (optional)

SIM7600G-H -M2-TOP.png

  • Open the device manager and you can see that there are COM ports as shown in the figure below.


  • If the COM port is recognized in the above picture, but an exclamation mark appears, it means that the driver has not been installed, and can be manually loaded as follows:
  • Download drive: SIM7600X drive document.
  • Insert the USB port of the 4G HAT into a Windows computer (the Windows 10 operating system is used as an example below)
  • Unzip the driver file --> Double-click the exe driver file with the left mouse button --> Select the installation path --> NEXT --> Wait for the installation to complete --> Restart the computer --> Complete the driver installation.
  • After installation, all the devices should be recognized normally as below:

SIM7600X-Driver- (6).png

Net light operating condition

Net light operating condition as follows:

Net Light working mode Module working mode
Always on searching for the net or on the call
200ms on/200ms off Data connection established
800ms on/800ms off the network is registered
Off Shutdown or hibernate mode

Brief description of the test

Common AT commands

Command Description Return Value
AT AT test command OK
ATE ATE1 sets echo
ATE0 turns off echo
AT+CGMI Query module manufacture OK
AT+CGMM Query module model OK
AT+CGSN Query product serial number OK
AT+CSUB Query module version and chip OK
AT+CGMR Query the firmware version serial number OK
AT+IPREX Set the module hardware serial port baud rate +IPREX:
AT+CRESET reset module OK
AT+CSQ Network signal quality query, return signal value +CSQ: 17,99
AT+CPIN? Query the status of the SIM card and return READY, indicating that the SIM card can be recognized normally +CPIN: READY
AT+COPS? Query the current operator, the operator information will be returned after normal networking +COPS:
AT+CREG? Query network registration status +CREG:
AT+CPSI? Query UE system information
AT+CNMP Network mode selection command:
13:GSM only
38:LTE only
48 : Any modes but LTE
... ....

For more AT commands, see SIM7500_SIM7600 Series_AT Command manual_v1.07

SIM7600 4G HAT(B) AT Command.png

Use in Windows


[Note]: You must use a SIM card with GPRS networking function enabled and not out of service

NDIS Dail-up

  • At present, when using Windows 10 operating system, you can connect to 4G DONGLE module (equipped with 4G card of China Mobile/Telecom/Unicom). After installing the driver, most computers will automatically connect to the Internet.
  • If WINdows cannot access the Internet, you need to manually start NDIS dialing, open SIM7600 AT port, and send the command:

SIM820 dial.png
At this point, the NDIS dialing takes effect, and the computer can connect to the network; if the dialing command returns an error, send the following command to set the NDIS dialing mode and then dial again:


RNDIS Dial-Up Internet

In addition, dial-up Internet access using RNDIS is also possible:

  • After the device installed SIM card and antenna, connect the USB port to computer, then connect the power supply.
  • Refer to the above to install the USB driver
  • Open the serial port assistant, find the serial port number corresponding to the AT serial port, and send the AT command to check whether it is registered on the network:
  • If you have successfully registered on the network, then send the AT command to enable USB dial-up Internet access:
  • If the transmission is successful, the DTU will return OK and reboot automatically.
  • And then you can find that there are some unrecognized devices in the Device Manager on the computer, such as RNDIS (with exclamation mark).

RNDIS Dial-up01.png

  • Right-click the 'RNDIS', search "Update Divers" and select "Let me pick from a list of available drivers on my computer", then select "Network adapters" from the device list.

RNDIS Dial-up02.png

RNDIS Dial-up03.png

  • Select "Microsoft" in the manufacturer list of the Network adapters window, and then select "Remote NDIS Compatible Device" in the list on the right, which is the remote NDIS compatible device.


Click 'Next' and wait for the installation to finish, the RNDIS Kitl device will be installed successfully. And then you can see that the PC can access the Internet via DTU.

PPP dial-up

If the NDIS or RNDIS dial-up cannot access the Internet, you can also use PPP dial-up. The operation steps are as follows:

  • Network and Internet Settings -> Set up a new connection -> Connect to the Internet -> Dial up (D) -> Dial a phone number (D): *99# (others are empty by default) -> Connection -> Register -> Connected to the Internet

GPS Test

GNSS control instance

  • Plug in the GPS antenna, and place the receiver tag face down in the open air,(Note that rainy weather cannot be tested) you need to wait about 1 minute before receiving the location signal.


  • Detailed test instructions and screenshots are as follows:
AT+CGPS=1               // Open GPS
AT+CGPSINFO             // Prints GPS information to the serial port
AT+CGPS=0               // Turn off GPS

SIM7600E-H 4G DTU GNSS.png

TCP/IP Internet data

GPRS debugging requires a SIM card with GPRS networking function enabled:
The following example takes accessing a mobile SIM card as an example:

  1. Correctly install the mobile phone card (the GPRS networking function must be enabled), the GSM antenna, and connect the USB cable to the computer;
  2. Press the PWR key to start the module and wait for more than ten seconds;
  3. Observe whether the indicator light is normal, the PWR indicator is always on, and the NET indicator is flashing;

Set up a local computer virtual server

The virtual server defines the mapping relationship between the WAN service port and the LAN network server. All access to the WAN service port will be relocated to the LAN network server specified by the IP address. (Please refer to your router's corresponding manufacturer's manual)

  1. Use a browser to log in to the router management interface (please refer to your router manual for the specific address)
  2. Set the port number: 2317 (it does not conflict with the existing port number. In this example, it is set to 2317)
  3. Set the intranet IP of the computer (the IP obtained by the computer in the local area network can be run CMD on the local machine, enter the command line prompt, enter ipconfig to check the IPv4 address, the intranet IP of the computer in this example is, as shown in the following figure :


Configure GPRS

AT+CSQ       //Query the network signal quality. The first parameter is that the network signal quality is up to 31. The larger the  value, the stronger the network signal.
AT+CREG?         //Query the network registration status, where the second parameter is 1, indicating that the registration has    been successful.
AT+CIPMODE=1        //Set TCP/IP mode
AT+CSOCKSETPN=1          //select TCP/IP application mode
AT+CIPMODE=0          //select TCP/IP application mode
AT+NETOPEN         //startup mode 
AT+CIPOPEN=0,"TCP","",2317         //Set TCP、IP and port number, establish TCP/IP connection 
AT+CIPSEND=0,9,         //To specify to send 9 characters of data, return to > to start sending 9 characters of content
AT+CIPCLOSE=0,         //close the TCP connection
AT+NETCLOSE,         //close the network

The operation is shown in the following figure:

Call Phone

  • Refer to the "Hardware Configuration" chapter to connect the LTE antenna, SIM card (the phone function must be enabled) and the headset cable with microphone, and the module is turned on.
  • Common commands for making calls:
AT+CNUM Check the phone number (not all SIM cards support this command) +CNUM
AT+CSDVC AT+CSDVC=1: switch to headphone output
AT+CSDVC=3: switch to speaker output
AT+CLVL=? Query volume range OK
AT+CLVL=2 set volume to 2 OK
ATD<phone_number>; ATD10086; Dial Mobile customer service phone number 10086 OK
AT+CHUP set volume to 2 OK
AT+CLIP=1 Set up caller ID OK
ATA Answering the Phone OK
  • The detailed operation screenshots are as follows:

[Note]: When using the SSCOM serial port assistant to send and receive AT commands, you must click "carriage return and line feed"

Voice output mode and volume adjustment

AT+CSDVC=1 		//switch to headphones 
AT+CSDVC =3 	        //switch to speaker
AT+CLVL =?		//Query the volume range, return +CLVL: (0-5) //Indicates that the volume is adjustable from 0 to 5
AT+CLVL=2     	        //Set the volume to 2, return OK

Answer the phone

Incoming call serial port display: RING
Send “ATA”      //Answer the phone
Send ”AT+CHUP”  //Hang up

Audio parameter debugging

+CACDBFN: (Handset_cal.acdb,Handset_tianmai.acdb)	// It is recommended to consider setting this set of parameters 

A.In the initialization stage of the module startup, before making a call, add the following

AT^PWRCTL=0,1,3	// Mainly improve TDD noise effect 

B. The module is in the process of establishing a voice call

VOICE CALL:BEGIN  	// Establish module call to improve call    effect
AT+CECM=1      		//suppress echo
AT+CECH=0x500 	// improve the volume on the mobile phone  

See "SIM7X00_Audio_Application_Note" document for details

Send English SMS

  1. Correctly install the SIM card and LTE antenna, connect the module's USB interface to the computer with a USB cable, and turn on the module;
  2. Observe whether the indicator light is normal, the PWR indicator is always on, and the NET indicator is flashing;
  3. Set the local SMS center: AT + CSCA = " + 8613800755500" + Enter, return OK.

Note: China Mobile's SMS service center number is +861380xxxx500, where xxxx is the long-distance telephone area code where you are located. The SMS center may be different from place to place. For details, you can query Baidu or call China Mobile Unicom customer service. This SMS center is Shenzhen (0755) ;

  1. AT+CMGF=1: Set the SMS mode to TEXT;
  2. AT+CMGS="phone number"<Enter>, set the recipient's phone number, and then return: ">", send the content what you need, such as "Send massage test!", You don’t need to “Enter” at the end. After editing the text message, send 1A to send information in hexadecimal format (1A is the key value of "CTRL+Z", which is used to tell the module to perform the sending operation, or 1B or "ESC" to cancel the operation). After successfully sending, the module returns + CMGS: 15 confirm that the transmission was successful. As shown below.


Receive English SMS

  1. Send a message on the phone: "This is a receive test for SIM7600X!" to the test module
  2. When receiving the information, the serial port will brake and report the information, "SM", 20, which means there are 20 pieces of information in the SM, and the message just sent is the 20th piece of information.
  3. Read information: AT+CMGR=20 to read the 20th information (AT+CMGL="ALL" to read all information)
  4. Delete information: AT+CMGD=20, as shown below
  5. Convert the displayed information to text through a code converter.


Send Chinese SMS

  1. Set the parameters for sending SMS
AT+CMGF=1             //set to text mode 
AT+CSCS="UCS2"           //Set info text to UCS2 encoding set
AT+CSMP=17,167,2,25          //Set text mode parameters
AT+CMGS="00310033003400330032003100310039003100300031"          //Set the UCS2 set of the receiver's mobile number
  1. Waiting to return >, send the information content converted by the software at this time (00530049004D003700360030003000584E2D658777ED4FE16D4B8BD5), no carriage return is required at the end, after editing the text message, send 1A to send the message in hexadecimal format, as shown in the following figure:


Receive Chinese SMS

  1. Set the parameters for sending SMS
AT+CMGF=1    	 //set test mode
AT+CSCS="GSM"	//set GSM code set
AT+CNMI=2,1   	//Set up new message alerts
  1. When receiving the information, the serial port will automatically report the information, and read the returned 21st information as shown in the figure below:
AT+CMGR=21        //Read the SMS content of serial number 21
  1. Translate the information into Chinese in the software, as shown below:


User Guides of Raspberry Pi

Raspberry Pi Internet Operation

If you are using Raspberry Pi 4B, Raspberry Pi 3B+ or CM4-IO-BASE-A/B baseboard, you can use the used the customized USB adapter.if it is used for other embedded mainboards or PCs, it can be connected through the matching double-head usb3.0 data cable; as shown in the following figure:
SIM7600G-H-M2 4G HAT-1.png
For specific operations related to Raspberry Pi dial-up Internet access, please refer to the following links:

Raspberry Pi Minicom Sends AT Command to Debug

1. Connect the module into Raspberry Pi
2. Install minicom, minicom is a serial debugging tool for linux platform

sudo apt-get install minicom

3. USB and UART serial AT command debugging

  • Execute minicom -D /dev/ttyUSB2. (default baud rate is 115200)
 sudo minicom -D /dev/ttyUSB2
  • Enter the following AT command in minicom to open the UART. (default baud rate is 115200)
  • Turn ON the TXD and RXD of the dial switch and execute minicom -D /dev/ttyS0. (Baud rate 115200)
 sudo minicom -D /dev/ttyS0 -b 115200

SIM7600G-H-M2 4G HAT-3.png
4. Taking the AT synchronization test as an example, send relevant commands, as shown in the following figure:
SIM7600G-H-M2 4G HAT-2.png
* minicom can enter the setting mode by pressing Ctrl+A, then Z, and exit by selecting X. If the sending command does not display, please send the command ATE=1 + Enter -> open the echo

Program sample

  1. After inserting the module and connecting it to the Raspberry Pi;
  2. Download the sample program to the /home/pi/ path;
sudo apt-get install p7zip-full
7z x 

3. Go to the corresponding instance directory, compile and run the program, the relevant instructions are as follows (take the program as an example):

cd SIM7600G-H-4G-HAT-B-Demo/Raspberry/python/PhoneCall/ //Enter the folder where is located
sudo apt-get install python3-pip
sudo pip3 install pyserial 

sudo pip3 install RPi.GPIO

sudo python //Run the program

AT Command


Phone Call Demo


Receive & Send SMS

Receive & Send SMS.png
Note: The sample program is to send English text messages. If you have sent Chinese text messages, you need to use the following commands to change to English format:


GPS Demo


TCP Network Communication Demo


FTP Upload & Download Demo


Jetson Nano Demo

Hardware Connection

Jetson Nano has an onboard USB interface, SIM7600X 4G HAT(B) is connected to the USB interface of Jetson Nano through Micro USB.

Jetson Nano minicom Serial Port Debugging

1. Connect the SIM7600X 4G HAT(B) to the Jetson Nano and turn it on after three seconds
2. Use Template:SERIAL to log in to the Jetson Nano terminal, install minicom, and enter:

sudo apt-get install minicom

3. Run minicom for debugging, and enter in the terminal

sudo minicom -D /dev/ttyUSB2 -b 115200

4. Send AT command to test, exit minicom and press Ctrl+A, then X, and finally press ENTER Jetson nano demo.png
More demos to be continued...



Demo Example




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


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 well connected;
  • Whether the connected SIM card can call 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 whether 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 the operator's access situation: AT+COPS?
  • Check the connection status: AT+CPSI?
  • Check whether it is successfully registered to the network: AT+CGREG?

SIM7600X network check.png


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


It may be that the APN has not been obtained. Generally, the APN can be obtained automatically. In some areas (IoT card), it needs to be obtained manually. For example, it can be set by the following instructions:

AT+CGDCONT=1,"IP","CMNET" //CMNET is the apn of China Mobile, which is different for different operators
SIM7600X apn.png

  • 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

SIM7600X-FAQ (4).png

  • If 4G has been fixed, the speed is still not ideal, it may be a frequency band problem;
AT+CNBP? //Back up the current frequency band (the returned frequency band information can be copied to notepad, etc.)
AT+CNBP=0x0002000000400183,0x000001E000000000,0x0000000000000021 //After returning OK, measure the speed
AT+CNBP=0x0002000004400180,0x000001E000000000,0x000000000000003F //If the speed does not improve, try this

SIM7600 band speed.png


SIM7600X-FAQ (6).png
1. Pay attention to check the device manager, the new device will be prompted during the upgrade process, and there will be no device driver during the first upgrade;
2. Pay attention to the USB cable. The speed of the USB cable is higher during the upgrade process. You need to choose a better quality USB cable to avoid poor contact.
3. You need to run the upgrade tool with administrator privileges (SIM7500_SIM7600_QDL V1.41 only for Update)
4. Uninstall and reinstall the upgrade tool (SIM7500_SIM7600_QDL V1.41 only for Update)
5. For more operation details, please refer to this video:


If the short message is stored in the SIM card, usually 50 is the upper limit. You can use the command: AT+CPMS? Make a query


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

  • Frequency: 700m 800m 900m 1710-1920M 2010-2100M 2300-2400M 2500-2690M-5800MHZ
  • Gain: 9dbi ± 0.7dbi

  • Make sure your system kernel is above 5.4. Do not use sudo update to upgrade the Raspberry Pi to the latest version. This will upgrade the kernel version to a version higher than the current firmware and it will not be recognized.
  • It is recommended to use the more convenient RNDIS dial
  • Can burn the latest Raspberry Pi Raspbian system, reconfigure NDIS dial

Make sure that 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 RNDIS dial-up
Or use the image that has been configured with the driver, RNDIS dial-up and boot up and start raspbian system image (the driver has been installed)

  • Can burn the latest Raspberry Pi Raspbian system, reconfigure NDIS dial

From left to right are ①Latitude, ②Longitude, ③Date, ④Time, ⑤Elevation, ⑥Speed ​​and ⑦Angle.

SIM7600 GNSS FAQ (1234567).png

Plug in the GPS antenna to the GNSS antenna base, and place the receiver label face down in an open outdoor (note that it cannot be tested in rainy weather). It takes about 1 minute to receive the positioning signal after power-on;

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, then copy the entire SIM7600X folder to the Raspberry Pi /home/pi directory, and enter the command line to /home/pi /SIM7600X directory, and then execute the chmod 777 sim7600_4G_hat_init command. "


Execute: autoreconf -vfi, and then recompile, as shown in the following figure:


The RNDIS mode COM port can be loaded with the following drivers:
SIM7600X Driver


If you require technical support, please go to the Support page and open a tickets.