# Dex wrist Dynamixel communication failures

**URL:** <https://forum.hello-robot.com/t/dex-wrist-dynamixel-communication-failures/637>\
**Category:** Ask\
**Created:** [March 17, 2023, 3:12pm UTC](https://forum.hello-robot.com/t/dex-wrist-dynamixel-communication-failures/637 "2023-03-17T15:12:27Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![lamsey](https://yyz2.discourse-cdn.com/flex030/user_avatar/forum.hello-robot.com/lamsey/32/177_2.png) [@lamsey](https://forum.hello-robot.com/u/lamsey)\
**Post date:** [March 17, 2023, 3:41pm UTC](https://forum.hello-robot.com/t/dex-wrist-dynamixel-communication-failures/637/2 "2023-03-17T15:41:07Z")

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I had some similar issues (on an RE1) in the past, maybe some of the discussion in [this forum post](https://forum.hello-robot.com/t/beta-dex-wrist-ping-failure-dynamixelcommerror/271) could help?

For me, running `RE1_dynamixel_id_scan.py /dev/hello-dynamixel-wrist --baud 115200` failed, but scanning for the head motors still worked.

Things we tried, in order:

1. We checked my Stretch params, user params, and hello robot library versions
2. We replaced the dynamixel cables in the wrist assembly
3. We replaced the WACC board in the robot’s wrist

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