LabVIEW hang in Serial communication !!

[ajapyy]

hi.

I use pl2303HXA (usb to UART converter) in my design and send data from micro to pc in LabVIEW 2013 x86.

when i tried in CODEVISION terminal, every thing is OK and each micro send to PC, in Hypertermial or CODEVISION terminal is correctly received.

but when I run LabVIEW, it work few second and Communication suddenly abrupt and LabVIEW has hang. u can see that in below image that I capture from my decktop. Why LabVIEW hang ?

image is front panel of my VI.

whenever it hang, I must restart LabVIEW and test again. in meanwhile I must said that hang is randomly occur.

Thanks.

[Dennis_Knutson]

Where's the block diagram? Can't tell a thing from just the front panel.

[billko]

What kind of baud rate is that?

[ajapyy]

baudrate is ok. I changed it to 115200 but LabVIEW hang again !!

This is image from my Control panel.

Sub VI in above image get a 24 bit 2's Complement hex string and it's output is DBL number which can be positive or negative. Sub VI is shown below :

Sub VI work correct and in my opinion problem is not from that.

my OS is Win7 x86 and LabVIEW is 2013 x86.

VISA is installed full and correct.

I send Data with little delay approximatlly less than 0.5ms. Communication is Right in Other terminals like Hyperterminal but in LabVIEW work few second and suddnly hang and I must restart LabVIEW and Micro to continue.

Data Sendig from Micro is continusly and Idle time isn't exist.

[nyc_(is_out_of_here)]

I don't see a Write.

[JensG69]

Is your communication really using a Termination Character? You did not deactivate it on the serial configuration VI.

Regards, Jens

[billko]

The hang isn't "random".  It's telling you that you don't understand how to communicate with the equipment.  I see you are using bytes at port AND using a termination character (on by default in the serial config).  Use one or the other, but not both.

[ajapyy]

First of all I must appreciate your's reply 😉

as you said I deactivate termination character and run my VI again.

it's run correctly longer than previous mode but yet has same problem and hang again !!

it's new image from my VI :

as you see above, problem which was hang in receive still is !! 

[Dennis_Knutson]

Please connect an error out indicator. Also, what is special about 6 bytes? You have absolutely no synchronization so it would seem that the bytes are just random. It would be better to append a termination character with the micro code and enable it on LabVIEW.

[ajapyy]

How I can connect  an error out indicator to my VI ?

6 is not my hero number    ,  in micro I send 6 byte every time to PC and I set this point in byte as port .

your offer is I append a byte to my Protocol and send 7 byte in every Communication with a termination character like 'A' in end of my Protocol ?