English French German Italian Portuguese Spanish Swedish

 

[SOLVED] Error 68 on TCU of 914

  • KonstantinR
  • KonstantinR's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
1 year 3 months ago - 1 year 3 months ago #15337 by KonstantinR
[SOLVED] Error 68 on TCU of 914 was created by KonstantinR
Hi guys, I looked everywhere but I couldn't find an explanation. I get "Error 68" whenever I run the TLR46 and select the COM port. I have done everything described in the video and more (whatever I found here in the forum).
- I bought an FTDI chip serial-to-usb cable;
- selected it to be on COM1;
- unplugged and then plugged it again and checked the settings (all is good);
- I run the TLR46 (as per TCU model) in dosbox;
- it opens up and asks for a video adapter;
- I select VGA;
- then it asks for a comport and when I select com1;
- it beeps and displays the message "Error 68" and terminates the program.

Can anyone tell me what does that error code mean and how to possibly fix it? It also doesn't matter if I do it while connected to the TCU, or not.

Thanks
Last edit: 1 year 3 months ago by KonstantinR.

Please Log in or Create an account to join the conversation.

More
1 year 3 months ago #15350 by admin
Replied by admin on topic [SOLVED] Error 68 on TCU of 914
I don't know if TLR was coded in VBA or not - but I suspect you are getting this error:

msdn.microsoft.com/en-us/library/aa232020(v=vs.60).aspx

if so: Could be faulty USB hardware, or something astray in the virtual comm port settings. If you have a null modem cable for RS232 (easy to make!) you could try hooking up a known good machine and see if they can communicate over the comm ports using some simple terminal programs...

ALSO - a lot of the time the USB com port doesn't really configure to COM1 at all - but defaults off to Com11 or something. Maybe you can try using COM2 instead?

Please Log in or Create an account to join the conversation.

More
1 year 3 months ago - 1 year 3 months ago #15352 by Wm Hertzel
Replied by Wm Hertzel on topic [SOLVED] Error 68 on TCU of 914
The operating system usually assigns the COM Port Number to the USB/232 adapter as it is inserted. COM1 is highly unlikely.
The assigned number often appears to be random or loosely related to which USB port the adapter is plugged into.
Move the adapter and the COM Port number changes. And Not sequentially.

Drill down to the Device Manager and see what COMM Ports exist before plugging in the adapter, The one that appears after insertion is the adapter number.
Last edit: 1 year 3 months ago by Wm Hertzel.

Please Log in or Create an account to join the conversation.

  • KonstantinR
  • KonstantinR's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
1 year 3 months ago #15354 by KonstantinR
Replied by KonstantinR on topic [SOLVED] Error 68 on TCU of 914
Thanks everyone! I managed to solve the issue. I was running the whole thing under Windows 10 using DosBox emulation ( just as it is given for x64 systems in the manuals download page). And that seemed to be the problem. (wild guess follows) the dosbox must have interpreted the serial cable to be plugged in on the initially assigned com port, so no matter what I did in device manager of windows to change it to com1, the software must have read it as com3 or something else - hence the error. As RotaxOwner Admin correctly pointed out in his response that error meant something wrong with the hardware of the connection (the cable, or port) or the connection itself missing, which would be the case if the software did not detect the cable at com1 or com2.

So, the solution - clean install a 32 bit version of Windows 7 (mine was Ultimate N x86) on a spare HDD. Since I was using a cable by FTDI called Chipi-X I had to download additional drivers in order for the computer to recognize it as a serial port and not some "Other Device". www.ftdichip.com/Drivers/VCP.htm - Here you can find in the Comments section when you scroll down an executable file for Windows. Just download and install. The computer will immediately recognize the cable attached. Then just go to device manager and properties of the serial port device. go to advanced settings of the port tab and select the port to be COM1. Click apply and ok. Close everything and start up the software. Everything should be working. If someone has any problems or questions, feel free to pm me. I will gladly help with whatever I can.

Thanks again for all the help!
The following user(s) said Thank You: admin

Please Log in or Create an account to join the conversation.

  • Sdutoit10@gmail.com
  • Sdutoit10@gmail.com's Avatar
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
1 year 2 weeks ago #15902 by Sdutoit10@gmail.com
Replied by Sdutoit10@gmail.com on topic [SOLVED] Error 68 on TCU of 914
Looks Like I managed to get it to work using Windows10. Installed a Trendnet USB to Serial adapter and in the Dos window had to manually run the EXE file. Got the software to load, just do not know how to use it. Are you aware of an operator manual for the TCU software.

Would appreciate your help.
The following user(s) said Thank You: KonstantinR

Please Log in or Create an account to join the conversation.

  • KonstantinR
  • KonstantinR's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
1 year 2 weeks ago #15904 by KonstantinR
Replied by KonstantinR on topic [SOLVED] Error 68 on TCU of 914
@SeanDuToit I remember seeing some sort of manual on how to use the software, however I will need a few days to look for it. I will let you know as soon as I find some info. I'd just ask you for a little patience, since I am abroad now, and might not be able to react as quickly as I'd like.

Please Log in or Create an account to join the conversation.

More
1 year 2 weeks ago #15907 by admin
Replied by admin on topic [SOLVED] Error 68 on TCU of 914
Sean, check your email for some TCU documentation...

Please Log in or Create an account to join the conversation.

  • Sdutoit10@gmail.com
  • Sdutoit10@gmail.com's Avatar
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
1 year 2 weeks ago #15914 by Sdutoit10@gmail.com
Replied by Sdutoit10@gmail.com on topic [SOLVED] Error 68 on TCU of 914
Thanks much appreciated.

Please Log in or Create an account to join the conversation.

More
4 months 2 days ago - 4 months 2 days ago #18071 by tecor
Replied by tecor on topic [SOLVED] Error 68 on TCU of 914
Hi everyone
I have been assisting a friend with his Rotax 914 ( wont rev past 3000 rpm) . Gotten to the point where we need the monitor program.
I am getting the error 68. And a message stating that the software is incompatible with my 64 bit windows 7 system.
This is slightly different from the above issue i think. Also it would seem it sort of runs just once immediatly after installation, after that it crashes even after a computer cold boot. ( it does seem to be a terrible bit of software written in the 90's) but that aside its what we got.
Apology if this should have been a new thread , wasnt sure which way to post this.
Ps i am very familiar with serial coms i work with them regularly.
Anyone got any further thoughts , i cant rebuild my windows 7 just for this.
Last edit: 4 months 2 days ago by tecor.

Please Log in or Create an account to join the conversation.

More
4 months 1 day ago #18075 by admin
Replied by admin on topic [SOLVED] Error 68 on TCU of 914
"error 68" is usually due to issues with the serial-to-usb converter ( if not using a DB9 serial port).

have you checked the video on that? ( www.rotax-owner.com/videos-topmenu/rotax-minute/435-tcutips )

Sometimes a clean uninstall/reinstall of the TLR software will solve it, sometimes not

Please Log in or Create an account to join the conversation.

  • KonstantinR
  • KonstantinR's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
4 months 1 day ago #18077 by KonstantinR
Replied by KonstantinR on topic [SOLVED] Error 68 on TCU of 914
Hi, Alan!

I have been thinking about your issue and I can assure you that a clean install is your optimal solution. HOWEVER, since you have your reasons to not perform that (or at least it's a last resort), I think I might be able to help you. The crudest solution I have is for you to download and install Oracle's VirtualBox ( www.virtualbox.org/wiki/Downloads ). After that you can install a 32 bit version of windows 7 and install the TCU software, and attempt to connect to the engine. You can also follow my advice from the beginning of the topic. Also, if you encounter any more difficulties, please message me, so I can give it a look and try to help you.

I think there might be other, more elegant solutions, however I do not have the needed programming capacity to figure it out.

Cheers!
K

Please Log in or Create an account to join the conversation.

More
4 months 1 day ago #18078 by tecor
Replied by tecor on topic [SOLVED] Error 68 on TCU of 914
Thanks for the advice, i will give it some thought.
Interestingly the version of the program i downloaded from flyrotax indicates its 32 and 64 bit compatible.
The program is TCU46A.exe

Earlier today i actually got it to run on a 64 bit Samsung slate 7 tablet.
I had a procom usb to serial adapter plugged in and started the programme , the serial port selection box came up and i was able to choose the com port ( 11) in this case. And the tcu interface came up. It still showed a com port as com1 but im guessing the Com port selection screen is a bit of software that translates the com numbers actually used to be com 1 ?
So I will at the aircraft tomorrow and can try it out . If it doesnt work i can interface the tcu serial to my hexterminal programme , this will show raw data only but will be enough to look for changes in values as the rpm is varied.
Im lucky that i deal with rs232 in my everyday job ( industrial control systems ).
As to the prob in the 914 i think its coming down to fuel pressure being too low.
I can let you have updates if you are interested.
I thank you again for your kind helpmand offer.
Regards

Please Log in or Create an account to join the conversation.

  • KonstantinR
  • KonstantinR's Avatar Topic Author
  • Offline
  • Fresh Boarder
  • Fresh Boarder
More
4 months 1 day ago #18079 by KonstantinR
Replied by KonstantinR on topic [SOLVED] Error 68 on TCU of 914
@ Alan,

No worries! The problem with the compatibility is that it quite as well might not recognize the ports properly. If you're not getting the error anymore, that is great news!

As for the fuel, the pumps that come with the engine are not really powerful in order to be lightweight. That's why they have some height restrictions with respect to the engine, along with the fuel tank. In case you have not checked it out yet, there is a chapter somewhere in the installation manual, where the height location of the fuel tanks is described. So if you have the engine on a stand, you might want to raise the fuel tanks at about a a foot from the starter. Try this, and see what happens.

And yes, keep me posted on your progress with this issue!

Thanks!

Please Log in or Create an account to join the conversation.

More
4 months 16 hours ago #18082 by tecor
Replied by tecor on topic [SOLVED] Error 68 on TCU of 914
Hi all went well with the software today.
My instal onto th win7 tablet went well and was able to monitor and perform everything we needed.
We had some time so we tried another notebook on win 7 as well this one had a inbuilt com. It eent well also
Of course as it turns out we didnt need the software for diagnosis. By the time we were ready to try the software we had concluded that our issue wasnt in the boost .
It would not rev beyond 3k and surged until it starved and stopped.
After checking for steady fuel pressue and fuel pressure 3.6 psi above air box pressure , we changed out both carby bowls . Instant fix! The local Rotax agent suggested it. These new bowls have longer float guides and are slightly deeper. A sources says the bowls warp ! But at 400 hrs tt that sounds odd to me. More like a goof up in design that can be blamed on warping.
Thanks again cheers .
The following user(s) said Thank You: KonstantinR

Please Log in or Create an account to join the conversation.

More
4 months 10 hours ago #18083 by RobSeaton
Replied by RobSeaton on topic [SOLVED] Error 68 on TCU of 914
The warping is due to overtorque of the bowl plug.
49 inch lbs is the correct torque.

Please Log in or Create an account to join the conversation.