I worked with Zebra on this and was able to get the scanner working by
reducing the USB polling interval on the scanner to 8msec, the default
is to poll every 3msec. I still believe this is a bug in how xterm
accepts input because of the following:

A) This issue does not occur when accepting input as root.
B) This issue does not occur on older versions of xterm (261 was tested)
C) This issue does not occur when accepting input into other applications or 
windows.

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https://bugs.launchpad.net/bugs/1499416

Title:
  xterm freeze when accepting input from usb scanner

Status in xterm package in Ubuntu:
  New

Bug description:
  I have a symbol DS4208 Wired USB barcode scanner hooked up to a
  machine running Ubuntu 14.04 via a USB connector.  When using xterm
  and attempting to scan a 1D or 2D barcode the xterm window will accept
  in a couple characters from the USB scanner not in the correct order,
  and then lockup. The number of characters accepted varies, and is
  never in the correct order.

  This also happens from any child process launched from the xterm
  window.

  This issue is not present when I first sudo -s to obtain a root shell.
  Scans will be interpreted properly and characters are entered into
  child processes, or command line correctly depending on where the
  cursor is situated.

  This issue is not present in other terminal emulators such as
  lxterminal.

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