Which Cognex camera are you using?  Not all of the cameras have a socket server on them, you need a camera with a socket server. Also, I do not see any attached photos. 

Thanks Matthew. The model number of my camera is 8402. I attach some photos. I tested the communication between camera-computer and robot-computer as you can see in the photos. 

What is on the communication tab on Cognex Easy-builder?

also how is your data string that is returned structured on the camera?

I'm attaching a screenshot of the communication tab on Cognex-Easy-builder. On the other hand, I'm sending 4 different floating ppoint values from the camera (x,y,angle and score, Screenshot attached), I also tried sending these values as string values but the result was the same.  

I just realized that during the first seconds I can receive data but then my variable (var 1) is empty (screenshots attached). This is my program: 

I'm sending 15 and 10 just as carriage return and newline commands. On the other hand, I already tested the cognex URcap tool and it worked well but it's limited just to one guidance and I need to identify two different elements (screws and nuts). 

Ah, so if you aren’t triggering the camera each time you want to read the server quits sending out responses after a certain time out period. UR by default gives the server 2 seconds to send a packet after which it times out and returns an empty string. How is the camera being triggered?

I'm triggering the camera manually clicking on the trigger button on In-sight several times. If I use the commands provided by UR in order to get a snapshot (sending the string r and the byte 13), my variable (var1) keeps the same behaviour (I see some data for the first seconds and then it becomes empty).  This is the program modified: 

Let me see if I can find it, we usually just run in continuous snapshot mode. You could try that just to see if that starts sending data reliably. 

HI Matthew, I just tested it using the continuous snapshot mode and the problem is the same, after 3 seconds the variable is completely empty.

That is very strange behavior, if I get some spare time today I will try to test a spare camera that we have lying around here.

I'm now receiving the data constantly in my variable after running my job in continuous mode. The only way to extract the coordinates from the camera was using the command "socket_read_string("sockect0") instead of "socket_read_ascii_float(4,"socket0")".  Now, I have two problems: 1) I need to transform this string variable into a integer vector. 2) Once I have X, Y and the angle given by the camera, how can I transform this camera goal position into a robot goal position.

Have you tried putting the [ and ] brackets before and after the string you are compiling on the robot?  

I just tried but it didn't work. 

Thank you so much for your comments, the problem was related to the login of the camera. UR must send"admin" as the username and ""(void) as the password. These 2 messages need to be followed by a line feed and carriage return (13 and 10).

@danield271 thanks for the update!

Hi @ danield271 and matthew92,

I have a similar issue as well. I tried to use URcaps but the problem is that camera is mounted on top and not able to see the tool during calibration. So, calibration results are not correct. I also feel that it would be much flexible to establish the calibration and read the respective cells from in-sight software instead of using URCaps. 
Is it possible to share UR code how you establish the communication and send & read comments from in-sight software?

Thank you very much in advance.

Hi to all of you.

Im just wandering if i can send string data to from cognex to UR?
Im currently working on a barcode project that uses cognex and ur. which frankly new to me.

Thank you very much in advance