Template:SIM7600G-H 4G HAT (B) Quick start

Feature

• Connected via pogo pin or MicroUSB connector
  • Dedicated pogo pin for Raspberry Pi Zero/Zero W
  • MicroUSB connector for other Raspberry Pi boards or PC
• Incorporates SIM7600G-H global band 4G module, compatible with 2G/3G/4G network with global support
• USB HUB connector for other Raspberry Pi boards or PC, providing USB extension and 4G network access
• Supports dial-up, telephone call, SMS, TCP, UDP, DTMF, HTTP, FTP, etc.
• Supports GPS, BeiDou, Glonass, LBS base station positioning
• SIM card slot, supports 1.8V/3V SIM card
• Onboard audio jack and audio decoder for making the telephone calls
• 2x LED indicators, easy to monitor the operating status
• Control via AT commands (3GPP TS 27.007, 27.005, and V.25TER command set)
• Supports SIM application toolkit: SAT Class 3, GSM 11.14 Release 99, USAT
• Comes with development resources and manual (examples for Raspberry Pi)

Test

• To test this device, you should prepare the following components:

SIM7600G-H 4G HAT (B) × 1
LTE Antenna × 1
GPS Antenna × 1
USB-A to micro-B cable × 1
4G SIM card × 1
An earphone with a microphone × 1 (optional)

• Insert the activated 4G SIM card and the earphone(optional) to the HAT when the HAT is power off, and then connect it to the PC by the USB cable.
• The PWR indicator turns on after connecting.
• When the NET light starts to flash once every second, the module starts to work.

• Check the Device Manager of PC, the several COM ports will be recognized:

• If the COM ports are recognized with an exclamation symbol, you should install the driver manually.
• Connect the 4G HAT to Windows PC (Hereafter we use Windows 10 PC as example)）
• Open Device Manager—>Other Devices—>“SimTech, Incorporated”—>Update driver—>Browse my compute for driver software—>Choose the driver according to your OS—>Install it
  

• 
• 
• 
• 
• 
• 

• After installation, all the devices should be recognized normally as below:

NET working status

Reference of indicators

AT commands for testing

AT Command	Description	Return
ATE	ATE1: Echo mode on ATE0: Echo mode off	OK
AT+CGMI	Request manufacturer indentification	OK
AT+CGMM	Request model indentification	OK
AT+CGSN	Request product serial number identification	OK
AT+CSUB	Request porduct version	OK
AT+CGMR	Request firmware version	OK
AT+IPREX	Configure buad rate of model	+IPREX:OK
AT+CRESET	Reset model	OK
AT+CSQ	Query signal quality	OK
AT+CPIN?	Query SIM card status	+CPIN:RRADY
AT+COPS?	Query provider information	+COPS:OK
AT+CREG?	Query network registation status	+CREG: OK
AT+CPSI?	Query UE system information
AT+CNMP	Select Network Mode: 2: Automatic 13: GSM only 38: LTE only 48: Any modes but LTE <nr /> ....	OK

For more information about the AT command, you can refer to AT command manual

Dial-up Networking

【Note】:You must use a SIM card with GPRS networking enabled and haven't out of service.

Dial-up Networking with Windows PC

• Connect the SIM7600G-H 4G HAT (B) with the 4G SIM card to your win10 PC. After installing the driver, the PC will automatically recognize the module.
• If Windows PC still cannot access the Internet, you need to start NDIS dial-up manually.

Open the SIM7600 AT port and send the command:

AT$QCRMCALL=1,1

And then press 'Enter. At this time, NDIS dialing will take effect, and the PC can connect to the network.

• If you still can’t connect automatically, you can use PPP dial-up. The operation steps are as follows:

• 
• 
• 
• 
• 
• 

GPS debugging

• Plugin the GPS antenna and place the 4G HAT 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;

The test commands and screenshots are as follows:

AT+CGPS=1	       //Open GPS
AT+CGPSINFO          //Print GPS information to the serial port
AT+CGPS=0          //Close GPS

Make calls and answer

• Insert the SIM card, connect the LTE antenna and connect the USB interface of SIM7600E-H 4G HAT to PC, Then press the PWRKEY to power on the boardl
• Check whether the indicators blink correctly (PWR's and NET's flashes)
• Send AT commands as bellow:

Commands	Description	Return
AT+CNUM	Phone number (only supported by some SIM cards)	+CNUM OK
AT+CSDVC	AT+CSDVC=1: Handset output AT+CSDVC=3: Speaker output	OK
AT+CLVL=?	Check volume level	OK
AT+CLVL=2	Volume level set to 2	OK
ATD<phone_number>;	Make calls	OK
AT+CHUP	Hang up call	OK
AT+CLIP=1	Phone ring	OK
ATA	Answer call	OK

Voice output mode and volume adjustment

AT+CSDVC=1 		//Switch to earphone
AT+CSDVC =3 	        //Switch to speaker
AT+CLVL =?		//Query the volume range. If it returns +CLVL: (0-5), it means that the volume is adjustable from 0 to 5
AT+CLVL=2     	        //Set the volume to 2, return to OK

Answer the phone

Display the serial port of incoming call: RING
Send "ATA"                  //Answer the call
Send "AT+CHUP"               //Hang up the call

Audio parameter debugging

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

• In the initialization phase of the module startup, before making a call, add the following

AT^PWRCTL=0,1,3		// Improve TDD noise effect
OK

• During the establishment of a voice call

VOICE CALL:BEGIN      // Module call establishment and execution to improve call effect
AT+CECM=1        //Echo suppression processing
OK
AT+CECH=0x500       //Improve the volume effect of the mobile phone
OK

For more details, please check the file of "SIM7X00_Audio_Application_Note".