SIM7600EI 4G LTE CAT1/4 USB Modem w/ GNSS

Connect the modem via USB to a Linux host; it should enumerate as a CDC-ACM device. Use QMI or AT commands over the designated UART (default baud rate 115200) to initialize the module, set the APN for your cellular provider, and bring up the network interface. For USB mode, ensure the kernel has the necessary cdc_acm and qmi_wwan drivers loaded. The module supports standard AT commands like AT+CGDCONT to define PDP context and AT+CFUN=1 to enable full functionality.

Yes, the SIM7600EI supports the FreeRTOS-based Open CPU SDK provided by SIMCom. This allows you to write and compile custom C applications that run directly on the module's ARM core, bypassing an external host microcontroller. You will need to set up the SIMCom development environment, compile your code into a binary, and flash it onto the module via the dedicated firmware update interface, typically using a USB-to-serial adapter and specific tooling from the manufacturer.

You need two external antennas: one active LTE antenna covering the relevant bands (e.g., 700-2700MHz) and one passive GNSS antenna. Connect them to the respective U.FL/IPEX antenna connectors on the module. For optimal performance, use antennas with appropriate gain and ensure the LTE antenna is placed away from metal obstructions. The GNSS antenna should have a clear view of the sky. Always use impedance-matched 50-ohm RF cables and connectors to prevent signal loss.