Following the time-consuming effort to update my TIU's and DCS remote (see DCS 2.34 LOADER PROGRAM IS NOW AVAILABLE!!  I'm posting corrections that allowed me to get it done. The directions in the DCS Loader software for both TIU and DCS Remote update loading are out of date. I have two Rev. L TIUs, both of which have a USB cable connection that uses the kind of USB terminal at the TIU that is also used at the printer end for many USB printers (I used my own ordinary printer cable for the solution that works, explained here.) These TIUs DO NOT use the USB "micro-B" cable end (pictured below) that some did earlier, the USB micro B also mentioned in Barry Broskowitz's book published a couple of years ago.
WRONG cable for my TIU's above
The printer-style USB terminal that DOES fit is here:
As noted below this USB, from the USB terminals on my computers bought a few years ago, is powered so that additional power input (either through Fixed 1 TIU input or through the AUX power input) is NOT needed for updates of either TIU or the remote.
Existing instructions shown in the DCS Loader dialog boxes are, for the TIU:
"Sending Code to the TIU"
1. Close all other programs (other than DCS Loader itself)
2. Disconnect all power to the TIU Inputs (Var 1 & 2 and Fixed 1& 2 inputs, that is)
3. Disconnect TIU from tracks
4. Connect 9 pin serial connector between PC and TIU. (Note the problem with this since it provides TIU with power; violates rule noted under step 5 below.)
5. Connect 1/8" mini to mini (audio STEREO-3 conductors) cable from PROTO DISPATCH jack to PROTO CAST jack on the TIU (this puts the TIU into "programming mode", and must be done before any power source is connected to the TIU, either USB or the other choices above)
6 Apply power to either FIXED 1 input or AUX POWER
As you will read in the thread linked above, these directions led to hours of frustration and failure for these TIUs.
Note did "factory reset" on each TIU before anything else.
ALSO, found issues unzipping DCS Loader and DCS 4.30 downloads ("administrator privileges needed" error messages even though I AM the *** administrator and only user). In Windows7 at least, if you right click on the shortcut to either WinZip or 7-zip (a free alternative) and choose "Run as administrator", then you can browse INSIDE the unzipper software to the Downloads folder and extract or unzip the downloads successfully.
After lots of helpful and puzzled suggestions and questions from GunRunnerJohn, RJR, and Barry Broskowitz, the solution came by noticing that the USB connection made the internal power red LED seen through vents in TIU come on, so !! perhaps having it connected before the jumper mini stereo cable was causing failure, and perhaps the other power connection wasn't needed for this type TIU and its chosen USB cable. I reversed steps 4 and 5, doing 5 with jumper FIRST, then connecting USB cable (not 9 pin serial, which is not necessary with the USB option). I ignored step 6 and clicked on START button. Shazam, in one minute the update was done and my remote confirmed the TIU now had DCS 4.30 loaded (MENU, SYSTEM, TIU SETUP, TIU VERSION).
Now for the Remote update, similar changes.
Current dialog box instructions in DCS Loader:
Steps 1, 2, 3 are same (and still correct).
4. Connect TIU 9 pin serial connector between PC and TIU
5. Connect (4 conductor) telephone handset cable (Radio Shack item--be sure it's a HANDSET cable with the narrower modular plug size; R Shack number is in Barry's book, too, correctly). As warning popup will note DON'T connect to TIU AIU input--you will damage remote and/or TIU if you do that).
6. Apply power to Fixed 1 or AUX POWER
7. You will be instructed to hold down the Remote's Power (on/off) button (when to hold down and when to release it will come on screen as the process proceeds, be ready to hold down for about 5 minutes straight during one part of it).
Again, I tried a similar set of changes for my TIU's using the powered printer-type USB cable:
Reversed steps 4 and 5, connected phone handset cable from REMOTE INPUT on TIU to modular connector at base of Remote, and THEN connected TIU to computer with USB cable. Pressed START and Remote update proceeded with DCS 4.30 showing on remote.
Above is all in the attached Word document in case anyone wants to download and save it.
Barry plans to put this in his next book revision, and I'm sure MTH will get it corrected in the software itself, so those dialog boxes will be correct for these Rev L TIUs, with the printer-style powered USB connection.