It seems like you left out the most important information. An image of this ECU does not tell anyone how it is sending data. You've also picked a very bad example in that Ontrack seb site. That is very old and obsolete (and not well written in the first place).
There are shipping examples on serial communication and in order to help you, you need to provide details on the ECU communication protocol and if you get an error, provide the error number that you get. This is also essential information.
If you can get the communication to work in Hyperterminal, then you should have no problem with LabVIEW. That is probably the best place for you to start instead of flailing around trying to write a program from scratch. You can verify you have the correct serial cable and the correct com settings.
I have never used Hyperterminal ; I can give you more information about the ECU :
It's a LPC2103 ARM Processor . frequency : 10MHz the processor works with 32bits ; Baud rate 38400; com3
that's all .
tomorrow i will send also a printscreen of the test which i made in MAX (com3=>open visa test panel)
The .doc file would need to be translated and it seems to describe an application program from the vendor, but I don't see anything in there that refers to RS-232. The spec on the micro is useless. It's the people that designed and built the ECU that used the micro and it's their firmware that decides how the serial port is used. Where did you get the information on the baud rate? You really need a document that explains how to use the ECU with a third party application (that would be LabVIEW).
Sorry, but I don't see any information that can provide any details for someone to help you. Maybe you'll get lucky though and someone who has used this particular ECU will see your post.