Found it! I tested with a second board, again, and it worked. (Not=20 sure why the last time I tested it it failed, but that is a different=20 story) The second board functions with either of the FTDI cables (after=20 reversing Tx & Rx). Looking more closely at the first board, I found a=20 wire whisker across two resistors effectively shorting the 3.3 supply to=20 the DOUT signal. (It was a "flying" whisker so it may not have made=20 contact during board testing.) Removing the whisker connection and all=20 appears to function as expected. It should have gone under the=20 magnifying lens earlier. -Phil- ------------------------------------------------------- Gravity: It's not only a good idea, it's the law! ------------------------------------------------------- On 3/23/2015 2:49 PM, Mike Hord wrote: > Have you verified that data is flowing through the FTDI cable? > > The easiest way to do this is by bridging tx and rx with a jumper wire, > opening a connection in a terminal program (X-CTU will work), turning > off local echo and seeing if the stuff you type appears in the window. > > If it doesn't, you've got some fundamental underlying problem with the > serial converter. If it does, it's the explorer board. > > Mike > > On Mon, Mar 23, 2015 at 3:37 PM, Phil Keller wrote: > >> I purchased a couple of XBee S1 modules, one XBee explorer regulated= , >> one Xbee explorer USB, a 3.3(I/O)/5v(Vcc) and a 5v only (I/O & Vcc) FTDI >> adapter cables from SparkFun. The explorer regulated has an onboard >> regulator to produce 3.3v Vcc from the 5v Vcc as well and level >> translation from 5v to 3.3 for the I/O. I have been unsuccessful in >> getting either of FTDI cables to work with the explorer. When I try to >> establish the connection in XCTU the SW indicates that it is unable to >> detect the module. So far I have: >> >> - Verified that the signals are where they should be. >> - I reversed the Tx & Rx pins (didn't work either way) >> - Held open the CTS >> - The FTDI is providing Vcc =3D=3D 5 to the Explorer. >> - Asked on the SparkFun forum >> >> The S1 modules work fine with the USB explorer. >> >> The write-up from Sparkfun indicates that the 3.3 signals can be used >> by the explorer, but being a skeptic I purchased the 5v version without >> success. >> >> Has anyone used the FTDI cable with the XBee explorer? Did it work ou= t >> of the box or did you need to make some modifications? >> >> Thanks for any suggestions/guidance, >> >> -Phil- >> >> -- >> http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .