Airplane Mode; Communication Interface With A Host - Quectel RM502Q-GL Hardware Design

3.1.2. Airplane Mode

The module provides a W_DISABLE1# pin to disable or enable the airplane mode through hardware
operation. See Chapter 4.5.1 for more details.

3.2. Communication Interface with a Host

The module supports to communicate through both USB and PCIe interfaces, respectively referring to the
USB mode and the PCIe mode as described below:
USB Mode
⚫
Supports all USB 2.0/3.1 features
⚫
Supports MBIM/QMI/QRTR/AT
⚫
Communication can be switched to PCIe mode by AT command
USB is the default communication interface between the module and the host. To use PCIe interface for
the communication between a host, an AT command under USB mode can be used. For more details
about the AT command, see document [4].
It is suggested that USB 2.0 interface be reserved for firmware upgrade.
USB-AT-based PCIe Mode
⚫
Supports MBIM/QMI/QRTR/AT
⚫
Communication can be switched back to USB mode by AT command
When the module works at the USB-AT-based (switched from USB mode by AT command) PCIe mode, it
supports MBIM/QMI/QRTR/AT, and can be switched back to USB mode by AT command. But the
firmware upgrade via PCIe interface is not supported, so USB 2.0 interface must be reserved for the
firmware upgrade.
eFuse-based PCIe Mode
⚫
Supports MBIM/QMI/QRTR/AT
⚫
Supports Non-X86 systems and X86 system (supports BIOS PCIe early initial)
RM502Q-GL can also be reprogrammed to PCIe mode based on eFuse. If the communication is switched
to PCIe mode by burnt eFuse, the communication cannot be switched back to USB mode.
Note that if the host does not support firmware upgrade through PCIe, the firmware can be upgraded by
the PCIe Card EVB, which could be inserted into a PC. For more details, see document [3].
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5G Module Series
RM502Q-GL Hardware Design
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