# Seeking Tool Mounting Bracket 122039 for Old UR5 Robot **URL:** \ **Category:** Technical Questions\ **Created:** [May 18, 2024, 5:21am UTC](https://forum.universal-robots.com/t/seeking-tool-mounting-bracket-122039-for-old-ur5-robot/34283 "2024-05-18T05:21:18Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![talla83](https://avatars.discourse-cdn.com/v4/letter/t/ba8739/32.png) [@talla83](https://forum.universal-robots.com/u/talla83)\ **Post date:** [May 18, 2024, 5:21am UTC](https://forum.universal-robots.com/t/seeking-tool-mounting-bracket-122039-for-old-ur5-robot/34283/1 "2024-05-18T05:21:18Z")
Hello everyone, I have a very old UR5 robot and I’m missing an important part. Specifically, I’m looking for the Tool Mounting Bracket with the part number 122039. Does anyone know where I can find this part or perhaps has one to spare? Any hints or tips would be greatly appreciated. Thank you in advance from Germany! ![001](https://us1.discourse-cdn.com/flex020/uploads/universal_robots/original/2X/8/898b1666e4c5767ad92579b9845eece22d2b3bb1.png) ---
**Author:** ![efn](https://avatars.discourse-cdn.com/v4/letter/e/35a633/32.png) [@efn](https://forum.universal-robots.com/u/efn)\ **Post date:** [May 21, 2024, 5:18am UTC](https://forum.universal-robots.com/t/seeking-tool-mounting-bracket-122039-for-old-ur5-robot/34283/2 "2024-05-21T05:18:43Z")
Have you talked to the German distributor of UR? 🙂 They might have one lying around. ---
**Author:** ![talla83](https://avatars.discourse-cdn.com/v4/letter/t/ba8739/32.png) [@talla83](https://forum.universal-robots.com/u/talla83)\ **Post date:** [June 11, 2024, 3:37pm UTC](https://forum.universal-robots.com/t/seeking-tool-mounting-bracket-122039-for-old-ur5-robot/34283/3 "2024-06-11T15:37:31Z")
Yes, I have already tried that, but the response I received was that there have been none available since 2022. ---
**Author:** ![krmi](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/krmi/32/1945_2.png) [@krmi](https://forum.universal-robots.com/u/krmi)\ **Post date:** [June 11, 2024, 5:30pm UTC](https://forum.universal-robots.com/t/seeking-tool-mounting-bracket-122039-for-old-ur5-robot/34283/4 "2024-06-11T17:30:40Z")
Is this for a CB2 robot? ---
**Author:** ![talla83](https://avatars.discourse-cdn.com/v4/letter/t/ba8739/32.png) [@talla83](https://forum.universal-robots.com/u/talla83)\ **Post date:** [June 12, 2024, 5:03am UTC](https://forum.universal-robots.com/t/seeking-tool-mounting-bracket-122039-for-old-ur5-robot/34283/5 "2024-06-12T05:03:00Z")
Yes, it is. Is it possible to use the control board without the tool board? Another question. Is there a protocol description of the internal RS485 bus? I could use a microcontroller to build a kind of dummy that imitates the original circuit board. ![Fehler_Werkzeug_CA4O.PNG](https://us1.discourse-cdn.com/flex020/uploads/universal_robots/original/2X/c/cd323550d78d8b298b2edf5283da5f169346ccbf.jpeg) ---
**Author:** ![krmi](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.universal-robots.com/krmi/32/1945_2.png) [@krmi](https://forum.universal-robots.com/u/krmi)\ **Post date:** [June 12, 2024, 12:11pm UTC](https://forum.universal-robots.com/t/seeking-tool-mounting-bracket-122039-for-old-ur5-robot/34283/6 "2024-06-12T12:11:32Z")
Unfortunately CB2 went End-of-Support in June of 2022. I looked around but couldn’t find much information on it; I don’t believe you’d be able to use the control board without the tool board though. ---
**Author:** ![talla83](https://avatars.discourse-cdn.com/v4/letter/t/ba8739/32.png) [@talla83](https://forum.universal-robots.com/u/talla83)\ **Post date:** [July 20, 2024, 10:29pm UTC](https://forum.universal-robots.com/t/seeking-tool-mounting-bracket-122039-for-old-ur5-robot/34283/7 "2024-07-20T22:29:23Z")
After a long and unsuccessful search for the missing parts for my old UR5 robot, I decided to take matters into my own hands. Using a logic analyzer, I analyzed the RS485 communication of the robot. Through various assumptions and tests, I was finally able to program an STM32 microcontroller to handle the communication as a tool interface. Additionally, I managed to integrate and process the two digital inputs and outputs of the robot. The result is a functioning solution that makes the old UR5 robot fully operational again! [![](https://img.youtube.com/vi/gVw4BvaLKcw/maxresdefault.jpg "Wiederbelebung eines alten UR5-Roboters: Kommunikation repariert und Tool Interface erstellt!") ](https://www.youtube.com/watch?v=gVw4BvaLKcw) ---
**Author:** ![ttheis](https://avatars.discourse-cdn.com/v4/letter/t/b487fb/32.png) [@ttheis](https://forum.universal-robots.com/u/ttheis)\ **Post date:** [October 21, 2024, 6:48pm UTC](https://forum.universal-robots.com/t/seeking-tool-mounting-bracket-122039-for-old-ur5-robot/34283/8 "2024-10-21T18:48:36Z")
Are you able to share the code via github etc? We might need to use this if we can’t repair our tool board.