Work in Progress: This documentation is currently under development and has not been fully verified. The steps and commands provided here are preliminary and may need adjustments. Please proceed with caution and report any issues you encounter.
SIM7600G-H 4G HAT (B) Setup Guide
Complete guide for setting up a SIM7600G-H 4G HAT (B) as your AirCast 4G modem device.
LED Status Indicators:
- Blinking LED: Modem is working properly
- Solid LED: Issue with modem - check configuration
The Pi 4 can get hot during operation. Ensure proper cooling and ventilation when setting up your device. Never hot-plug the HAT while the Pi is powered on.
Required Components
- Raspberry Pi 4 or Zero 2w
- 16GB+ microSD card (Class 10 required)
- Active cooling case or heat sink with fan
- SIM card with active data plan
Hardware Connection
Follow the connection diagram below to properly connect your SIM7600G-H 4G HAT to your Raspberry Pi.
Software Configuration
1. Connect Modem
Connect the modem to your Raspberry Pi using USB. The modem will appear as /dev/ttyUSB2 device.
ls /dev/ttyUSB*
2. Install Minicom
sudo apt-get install minicom
3. Basic Modem Checks
sudo minicom -D /dev/ttyUSB2
Check if modem is responding:
AT
Expected response: OK
Check SIM card status:
AT+CPIN?
Expected response: +CPIN: READY
Check signal strength:
AT+CSQ
Signal strength interpretation:
- 0-9: Poor signal (may not work)
- 10-14: Fair signal
- 15-19: Good signal
- 20-31: Excellent signal
4. Configure APN
Set the APN for your mobile carrier:
AT+CGDCONT=1,"IP","Your_APN"
Common APN settings:
- AT&T: "broadband"
- T-Mobile: "fast.t-mobile.com"
- Verizon: "vzwinternet"
- Sprint: "x.ispsn"
- Google Fi: "h2g2"
5. Configure USB Mode
Send the following command through minicom and wait for the module to restart:
AT+CUSBPIDSWITCH=9011,1,1
6. Network Setup
Check network interfaces:
ifconfig
Configure DHCP for the USB interface:
sudo dhclient -v usb0
Troubleshooting
LED Status Issues
- Solid LED indicates configuration problem
- Check power supply and connections
- Verify AT commands were successful
Modem Not Detected
- Check USB connections
- Verify power supply is adequate
- Ensure kernel modules are loaded
No Network Connection
- Verify SIM card is properly inserted
- Check signal strength (AT+CSQ)
- Confirm APN settings are correct
- Try power cycling the modem
Poor Performance
- Check antenna connection
- Verify signal strength
- Monitor temperature for thermal throttling
- Test in different physical locations
Support Resources
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