Modes USB direct mode
Digi XBee3 Cellular LTE-M Global Smart Modem User Guide
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Command mode is available while in Bypass mode; see Enter Command mode for instructions.
Enter Bypass operating mode
To configure a device for Bypass operating mode:
1. Set the AP (API Enable) parameter value to 5.
2. Send WR (Write) to write the changes.
3. Send FR (Force Reset) to reboot the device.
4. After rebooting, enter Command mode and verify that Bypass operating mode is active by
querying AI (Association Indication) and confirming that it returns a value of 0x2F.
It may take a moment for Bypass operating mode to become active.
Leave Bypass operating mode
To configure a device to leave Bypass operating mode:
1. Set AP (API Enable) to something other than 5.
2. Send WR (Write) to write the changes.
3. Send FR (Force Reset) to reboot the device.
4. After rebooting, enter Command mode and verify that Bypass operating mode is not active by
querying AI (Association Indication) and confirming that it returns a value other than 0x2F.
Restore cellular settings to default in Bypass operating mode
Send AT&F1 to reset the cellular component to its factory profile.
USB direct mode
This mode allows you to access the XBee Smart Modem's USB interface directly through XBee pins 7
and 8. VBUS functionality is optionally provided on XBee pin 6 if you wish to enable and disable USB
mode based on an external source. While in USB mode the cellular modem is not able to communicate
serially with the XBee MCU. All communication with the cellular modem must be performed by the
user via the USB port.
Configure the data pins
Set P1 (DIO11/PWM1 Configuration) to 7 to configure pins 7 and 8 for USB direct mode.
If USB Direct is not enabled (P1 is not set to 7), then DO (Device Options) bit 2 and P0 being set to 6
have no effect on the USB VBUS state.
Enable USB direct mode
You can enable USB direct mode in two ways:
1. Enable via software: Set DO (Device Options) bit 2. Ensure that P0 (DIO10/PWM0 Configuration)
is not set to 6 as that would override the DO setting.
2. Enable based on the state of VBUS (pin 6): Set P0 to 6. Apply a logic high signal to DIO10/PWM0
(pin 6) to enable USB or a logic low signal to disable USB.
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