I am setting up a small network of XTP9B (Xtend PKG units) radios for a project to pass data between PLCs. In the past I did this with the Xtend pkg radios that i configured with the old XCTU program. We were able to put a loop back adapter on one radio, leave the other radio connected to the laptop and run a range test. I cannot seem to do this in XCTUNG. Has anyone figured this out? I already tried the pull down item called LOOPBACK and cannot get it to work. Someone at Digi suggested using the API mode to do test with this radio, but provided no details on it.