2021-11-03 13:08:45 Will Son

Hi,

You may try connecting the OpenCM9.04 under the Recovery Mode as described in the eManual below.

https://emanual.robotis.com/docs/en/parts/controller/opencm904/#recovery-mode 

This will ensure to run the bootloader during the boot up process if you have a problem in running the sketch code.

Once the bootloader is loaded, you can upload a new sketch on OpenCM9.04.

If you are using a multiport USB hub, try connecting the OpenCM9.04 directly to the USB port on the PC as some USB hubs may cause similar issues.

Thank you.

2021-11-05 16:26:23 CHANADAN KUMAR

Dear Sir,
Thanks for your quick response, updating the bootloader as you said worked fine. Now the open CM is working fine (individually). But when we are connecting Dynamixel motor to it via expansion board, the motors are not working but the code works well (except the motor running codes). We have tried firmware recovery for each motors still they are not operating.

kindly suggest solution for the same. Waiting for your valuable response.

2021-11-10 16:22:26 Will Son

Hi,

Please make sure that the correct serial port is selected when using OpenCM9.04 with the OpenCM485EXP board.

Please refer to the comment in the example source code to find this out.

https://github.com/ROBOTIS-GIT/OpenCM9.04/blob/master/arduino/opencm_arduino/opencm9.04_release/libraries/OpenCM9.04/examples/07_DynamixelSDK/protocol2.0/read_write_mx/read_write_mx.ino#L26

The video instruction below might help.

https://youtu.be/OvmGwDDrdu0?t=435

Thank you.