# CAN message from PMU to V3 CAN Switchboard

**URL:** <https://community.ecumaster.com/t/can-message-from-pmu-to-v3-can-switchboard/4355>\
**Category:** PMU\
**Created:** [September 5, 2025, 10:58pm UTC](https://community.ecumaster.com/t/can-message-from-pmu-to-v3-can-switchboard/4355 "2025-09-05T22:58:53Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Kiwiconnectors](https://avatars.discourse-cdn.com/v4/letter/k/c67d28/32.png) [@Kiwiconnectors](https://community.ecumaster.com/u/Kiwiconnectors)\
**Post date:** [September 5, 2025, 10:58pm UTC](https://community.ecumaster.com/t/can-message-from-pmu-to-v3-can-switchboard/4355/1 "2025-09-05T22:58:53Z")

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I ran out of inputs for the PMU 24 so I have a V3 switchboard along side it to give me more inputs.

I also want to use the low outputs on the board for some indicator LEDs.

The CANX file on the PMU has address 0 x 642

The Light client says inputs are on the switchboard is 0 x 643

How do I get the PMU to transmit on 0643 to turn on a L1 - L4 output ?