# Connectcore 6UL pro UARTs

**URL:** <https://forums.digi.com/t/connectcore-6ul-pro-uarts/22203>\
**Category:** Linux\
**Tags:** uart, connectcore, 6ul\
**Created:** [February 12, 2021, 8:45am UTC](https://forums.digi.com/t/connectcore-6ul-pro-uarts/22203 "2021-02-12T08:45:56Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![cstanton](https://avatars.discourse-cdn.com/v4/letter/c/e56c9b/32.png) [@cstanton](https://forums.digi.com/u/cstanton)\
**Post date:** [February 12, 2021, 8:45am UTC](https://forums.digi.com/t/connectcore-6ul-pro-uarts/22203/1 "2021-02-12T08:45:56Z")

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Hi,

I have a couple of questions regarding the UARTs on the Connectcore 6UL pro.

Are i.MX6UL UART2 and I/O expander UART2 different UARTs, and can we use both?  
Is it possible to use the console port UART5 as a normal UART (ie connect external devices to it)?

The documentation has a note for UART1 saying “Two signals of the I/O expander are reserved to be used as a UART. They are connected to an RS-232 level adapter. CAUTION! This functionality is not supported by the current I/O expander firmware.” To clarify, does this mean they cannot be used? Also, is this different to the RS232\_IOEXP\_2\_TX and RX on j29 pins 1 and 2?

Thanks!

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**Author:** ![LeonidM](https://avatars.discourse-cdn.com/v4/letter/l/d26b3c/32.png) [@LeonidM](https://forums.digi.com/u/LeonidM)\
**Post date:** [February 12, 2021, 9:17am UTC](https://forums.digi.com/t/connectcore-6ul-pro-uarts/22203/2 "2021-02-12T09:17:03Z")

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you can find the list of available UART ports on cc6ul here:  
[https://www.digi.com/resources/documentation/digidocs/embedded/dey/3.0/cc6ul/bsp\_r\_uart\_6ul](https://www.digi.com/resources/documentation/digidocs/embedded/dey/3.0/cc6ul/bsp_r_uart_6ul)

IO Expander UART was in plans but it was never implemented and will not be implemented in the future. I believe we removed any mentioning of it from all recent documentation.