# How to prove that the 24v port of the CN1 interface of the controller can work normally

**URL:** <https://forum.cloudray.com/t/how-to-prove-that-the-24v-port-of-the-cn1-interface-of-the-controller-can-work-normally/276>\
**Category:** FAQ\
**Created:** [April 16, 2021, 8:43am UTC](https://forum.cloudray.com/t/how-to-prove-that-the-24v-port-of-the-cn1-interface-of-the-controller-can-work-normally/276 "2021-04-16T08:43:58Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Technician](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.cloudray.com/technician/32/15_2.png) [@Technician](https://forum.cloudray.com/u/Technician)\
**Post date:** [April 16, 2021, 8:43am UTC](https://forum.cloudray.com/t/how-to-prove-that-the-24v-port-of-the-cn1-interface-of-the-controller-can-work-normally/276/1 "2021-04-16T08:43:59Z")

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Use a multimeter to check whether there is DC 24V between pin 1 and pin 6 of the CN1 interface.If there is, it works normally, otherwise it is abnormal.