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Xbee3 LTE Cat 1 USB DIRECT Failure

0 votes
Device is XB3-C-V1-UT-001
Firmware is 1516
Host OS is Ubuntu 18.04

When I enable USB direct via XCTU I can see that the device switches to USB because dmesg shows an attempt at enumeration, however the device never successfully enumerates.

Instead of adding a connector for testing, I have a USB cable soldered directly to the pin of 7/D+ 8/D- and GND.

dmesg output shows:
usb 1-4: new low-speed USB device number 11 using xhci_hcd
usb 1-4: device descriptor read/64, error -71
it tries multiple device numbers
usb usb1-port4: unable to enumerate USB device

Do I need to update the Telit modem directly to use USB direct?
asked Jan 4, 2021 in XBee Cellular by deltav New to the Community (8 points)

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1 Answer

0 votes
Answer turned out to be shamefully obvious. The old dev board has the pads shifted by 1 next to the modem. So the pad directly next to pin 7 is actually pin 6...

Once that was rectified the device enumerated correctly in Windows and Linux.
answered Jan 5, 2021 by deltav New to the Community (8 points)
If by "The old dev board" you are referring to the XBIB-U board: in case you hadn't thought of it, in the future we'd recommend you get and use the XBIB-CU-TH dev board as it has the USB header you need for USB Direct built-in. https://www.digi.com/products/models/xbib-cu-th