COMMUNICATION RS232

Hello , 

 I'm working on a project with a Robot ABB and a camera support by the software SCORPION VISION 8.0! It's the first time i use Scorpion and the Rapid language. 

For the moment I'm working on the communication between the robot and the software scorpion which is etablished by serial communication RS232.
Unfortenetly I have a data transmission problem !
My problem is : if I want to receive a reponse from SCORPION, I have to send a message in loop. 
                         If I send a message just one time, we can't read the message. 

One the other side, there isn't any problem i send something from the robot to scorpion.

Hope you'll understand my problem and someone could help me ...

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