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Why the Dual Gripper is not working ?

Common setup steps to resolve dual-gripper connectivity issues.

Context

When using a dual gripper setup with Robotiq products, it's essential to configure both units correctly. A common reason one or both grippers may not function is due to a communication conflict—typically related to their slave ID settings or scan sequence.

This article guides you through the required checks and steps to get both grippers working reliably.

 

1. Check the Slave ID Configuration

For a dual gripper setup to function, both devices must share the same slave ID. Each gripper needs to be uniquely identified by the controller during setup.

  • On Universal Robots (UR): Use the Polyscope interface to check or modify the slave ID.

  • On other robots: Use the Robotiq User Interface (RUI) to access the Modbus RTU parameters. You can use this article : How to change the Id a Robotiq Gripper ?

Mismatched slave IDs can cause either gripper to go undetected.


 

2. Scan the Grippers One at a Time

Before operating both grippers together:

  • Connect and scan each gripper separately to ensure proper recognition.

  • After confirming individual functionality, connect both grippers for joint use.

This ensures each device initializes correctly without conflict during the communication handshake.

 

3. Follow Robot-Specific Guidance

Depending on your robot type, follow the appropriate procedure:

Universal Robots (UR)

Other Robots

  • Open the Robotiq User Interface (RUI)

  • Adjust the slave ID settings in the Modbus RTU configuration panel

 

 

4. Video Support

Need a visual walkthrough? Access our video tutorial on the  Robotiq E‑Learning platform, which demonstrates how to configure dual grippers step-by-step.

 

Conclusion

If your dual gripper setup isn't working:

  • Check that both devices have the same slave ID

  • Scan them individually

  • Apply the correct process based on your robot type

These quick verifications resolve most dual gripper communication issues.