Convert sample program Serial.C to Dll

[Rebecca Tee]

Hi all,

Recently I found problem in using Serial flow control in Labivew. The unit under test will lost communication if i use Labview Visa serial to send/receive RS232 commands. When I tried with CVI RS232 sample program in cvi\samples\rs232\serial.prj , i found the communication is ok. However, I am not too familiar with CVI.

is that better to convert to dll to call by Labview or any other way to import the cvi program to labview?

if it's convert to dll, has anyone done that and willing to share the dll? I tried following steps to create dll in cvi, but when i call the function in labview, the front panels never load, what problem?

Thanks for the help!

[Sergei]

Hi Rebecca,

May be this help you, please see the attached file.
If you compile a CVI Project then you get DLL with help file as well.
Br,Sergei

[Rebecca Tee]

Hi Sergei,

Thanks for the example code. I have tried to compiled it to DLL but doesn't see help file. Anyway, it doesn't matter.

I tried to call the compiled DLL in Labview using the library node. However, the operation is timed out when I tried to receive buffer and the query input length is also zero. FYI, my unit under test will return a string once it is reset. So I am pretty sure the COMPORT has something inside the buffer. See attached for my program and dll

What program you used to call the dll last time? Please help to advise. Thanks a lot!

rgds
rebecca

[Sergei]

I'm using NI TestStand to call the dll witout any problems, as I seen your vi at least you need to have a loop mode until the read string is comming after reset. Better way is to use VISA functions for it. I will try to do it and let you know....

[Sergei]

Hi again,
The exsample is attached, for your solution just remove the write fun. and leave from the loop after getting the reset string

[Rebecca Tee]

Hi,

I used Visa Serial but has some problems. Anyway, have got the issue solved by doing some modifications on the software. Thanks for your help!

[EngMex]

Hello Sergei,
I came across your rs232.zip file which I used to create the rs232 dll sucessfully,
however when trying to use them in TestStand I found the help file (*.hlp) was not included,
could you share it with me?

Many Thanks
Luis

[Sergei]

Hi Luis,
The help file is attached.
Br,Sergei

[EngMex]

Hi Sergei
Thank You.