# Modbus custom command

**URL:** <https://forum.universal-robots.com/t/modbus-custom-command/21347>\
**Category:** URCap Development\
**Created:** [May 16, 2022, 11:02am UTC](https://forum.universal-robots.com/t/modbus-custom-command/21347 "2022-05-16T11:02:52Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![SynchMaster](https://avatars.discourse-cdn.com/v4/letter/s/35a633/32.png) [@SynchMaster](https://forum.universal-robots.com/u/SynchMaster)\
**Post date:** [May 16, 2022, 11:02am UTC](https://forum.universal-robots.com/t/modbus-custom-command/21347/1 "2022-05-16T11:02:52Z")

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Hello,

I need to use the URScript command: “modbus\_send\_custom\_command”.  
The problem is, that the command sets the message into a buffer and it doesn’t stop transmitting. Is there a solution to send the message only once? Or any other command to remove the message from the buffer?

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**Author:** ![bahno](https://avatars.discourse-cdn.com/v4/letter/b/f0a364/32.png) [@bahno](https://forum.universal-robots.com/u/bahno)\
**Post date:** [December 10, 2025, 4:37pm UTC](https://forum.universal-robots.com/t/modbus-custom-command/21347/2 "2025-12-10T16:37:18Z")

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Hi, any solution? I have the same issue.