Template: SIM7600G-H 4G DTU Guid

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quick test

Hardware test environment

Hardware preparation

The accessories required for the quick test are as follows:

  • Standard configuration (after purchase, there will be the following accessories):
SIM7600G-H 4G DTU host × 1 
High gain LTE main antenna (about 3 meters) × 1
High Gain Paddle LTE Auxiliary Antenna × 1
GPS antenna × 1
Serial cable male to female direct connection (about 1.5 meters) × 1
USB cable type A male to micro-B male (about 1.2 meters) × 1
12V 1A power supply × 1
SIM7600G-H 4G DTU configuration list

  • Hardware references that need to be prepared separately:
computer × 1
USB TO RS232/485/TTL × 1
4G card (or 4G-enabled mobile phone card) × 1

Hardware connection

In order to facilitate direct access to the computer test, we recommend to buy:USB TO RS232/485/TTL

The schematic diagram of DTU test hardware connection is as follows::
Hardware connection diagram

DTU startup and restart

SIM7600G-H-4G-DTU-led-key.jpg

Connect the hardware according to the picture above and insert the 4G card (standard SIM card).

  • Power-on: After the power supply is powered on, the NET network light is on or blinks, indicating that the power is successfully started.
The serial number Indicator/button Functional specifications
1 PWR The red light is on and the power is on
2 TXD Blinking blue: Data is being transmitted
3 RXD Blinking blue: Data is being received
4 NET The green indicator blinks, and the network is normal
5 LINK User - defined LED for secondary development
6 RESET Reset button
  • Restart: Press the RESET button to restart the device.

Software testing environment

The following test takes Windows 10 as an example. Before the test, install the driver, configure DTU parameters on the host computer, and then use the serial debugging assistant to perform transparent transmission test. The TCP/UDP server for transparent transmission can be a self-built server or a test server.

Driver installation

Used for the first time, you need to install SIM7600X 4G DTU driver

  • Insert the USB port of 4G DTU into a Windows PC (Windows 10 as an example below)
  • Open Device Manager - > Other Devices - > "SimTech,Incorporated" - > Update the driver - > Browse my computer to find the driver file - > Select a path to save the driver file based on your system - > Installation complete.
  • Install all identified devices according to the above method, and the driver installation effect is as follows:

SIM7600X-Driver-8.jpg

Common AT instruction

The command Show The return value
AT the AT test instruction OK
ATE ATE1 set echo
echo ATE0 closed
OK
The AT + CGMI query module manufacturers OK
AT + CGMM query module type OK
The AT + CGSN query product serial number OK
AT + CSUB query module version and chip OK
The AT + CGMR query firmware version serial number OK
AT + IPREX Settings module hardware serial port baud rate + IPREX:
OK
AT + CRESET reset module OK
AT + CSQ network signal quality query, return signal value + CSQ: 13 of 17
OK
AT+CPIN? to track the status of SIM card, return to READY, said SIM card can identify normal + CPIN: READY
AT+COPS? to query the current operator, will return after normal network operators information + COPS:
OK
AT+CREG? to track the status of network registration + CREG:
OK
AT+CPSI? query UE system information
AT + CNMP network mode selection command:
2: Automatic
13: GSM only
38: LTE only
48: Any modes but LTE
...
OK

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

SIM7600 4G HAT(B) AT Command.png

GNSS control instance

  • Plug in the GPS antenna, and place the receiver tag face down in the open air,. 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

4G Internet Access

Windows Internet Access

hardware connection

SIM7600G-H-4G-DTU-details-11.jpg

NDIS dial-up Internet access

  • 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 Windows 10 operating system.
  • If WINdows cannot access the Internet, you need to manually start NDIS dialing, open SIM7600 AT port, and send the command:
AT$QCRMCALL=1,1+enter

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:

AT+CUSBPIDSWITCH=9001,1,1

RNDIS Dial-Up Internet

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

  • Device installed SIM card and antenna, USB connected to computer, 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:
AT+CPSI?  
  • If you have successfully registered on the network, then send the AT command to enable USB dial-up Internet access:
AT+CUSBPIDSWITCH=9011,1,1
  • Send successfully, return OK, and DTU will automatically restart.
  • Observe the device manager and find some unrecognized devices, such as RNDIS (with an exclamation mark):
  • Right-click on RNDIS, search for the device software prompt window, and select "Browse My Computer". Select to select Network Adapters from the list of devices.
  • In the network adapter window, select Microsoft Corporation in the manufacturer list, and then select "Remote NDIS Compatible Device" in the list on the right, that is, the remote NDIS compatible device.
  • Click Next and wait for the installation to complete, the RNDIS Kitl device will be installed successfully. At this point, the dial-up function setting is completed, and you can see that the PC can access the Internet through 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

Raspberry Pi Raspbian Internet Operation

1.hardware connection

SIM7600E-H-Raspberry.png

2. Environment configuration

The Raspberry Pi Raspbian system has built-in drivers for SIM7600X, so there is no need to install additional drivers. However, some configuration needs to be done to enable 4G networking. Common networking methods are as follows:

Jetson Nano Internet Operation

1. Hardware connection

The hardware connection diagram is as follows:
SIM7600E-H-DTU-nano.png

2. Environment configuration

The Ubuntu system of Jetson Nano does not have the driver module file of simcom for the wwan0 network port by default, so you need to compile and install the driver module. For details, see:

Other Linux Internet Operations

1. Hardware connection

Connect SIM7600X 4G DONGLE to the hardware USB interface of the corresponding Linux platform.

2. Driver installation

First, you can use the command to check whether the system can recognize the driver normally. If the driver cannot be recognized normally, you need to install the driver manually. For details, see: