Modes Bypass operating mode (DEPRECATED)
Digi XBee3 Cellular LTE-M/NB-IoT Global Smart Modem User Guide
126
CAUTION! The lack of hardware flow control support in the cellular component may impact
the reliability of Bypass mode. See Hardware flow control in Bypass mode for details.
In Bypass mode, the device acts as a serial line replacement to the cellular component. In this mode,
the XBee Smart Modem exposes all control of the cellular component's AT port through the UART. If
you use this mode, you must setup the cellular modem directly to establish connectivity. The modem
does not automatically connect to the network.
Note The cellular component can become unresponsive in Bypass mode. See Unresponsive cellular
component in Bypass mode for help in this situation.
When Bypass mode is active, most of the XBee Smart Modem's AT commands do not work. For
example, IM (IMEI)may never return a value, and DB does not update. In this configuration, the
firmware does not test communication with the cellular component (which it does by sending AT
commands). This is useful in case you have reconfigured the cellular component in a way that makes it
incompatible with the firmware. Bypass operating mode exists for users who wish to communicate
directly with the cellular component settings and do not intend to use XBee Smart Modem software
features such as API mode.
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.
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