# How to communicate with UART 1 ( WP8548 ) - Mangoh Red

**URL:** <https://mangoh.discourse.group/t/how-to-communicate-with-uart-1-wp8548-mangoh-red/2570>\
**Category:** mangOH Red\
**Created:** [April 18, 2019, 8:30am UTC](https://mangoh.discourse.group/t/how-to-communicate-with-uart-1-wp8548-mangoh-red/2570 "2019-04-18T08:30:49Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![flonflon](https://avatars.discourse-cdn.com/v4/letter/f/278dde/32.png) [@flonflon](https://mangoh.discourse.group/u/flonflon)\
**Post date:** [April 18, 2019, 8:30am UTC](https://mangoh.discourse.group/t/how-to-communicate-with-uart-1-wp8548-mangoh-red/2570/1 "2019-04-18T08:30:49Z")

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Hi everybody,

I’m trying to use uart 1 about mangoh red. I have connected a FTDI serial cable to IOT boad expansion.  
The pin are: 12 && 13

 ![IoT_Pinout_connector_and_breakout_and_labels](https://us1.discourse-cdn.com/flex016/uploads/mangoh/original/1X/7d0b34e9bacc531dc9368702708d7df068f2e2a2.jpeg)

I want use this uart on Linux application. For try the communication I tried to use it like a console.  
So I have use “uartMode set 1 console” .

When I reboot my system, I can see system logs. But I can’t interact with them.  
I start microcom “microcom /dev/ttyHSL0 -s 115200”.  
I can write from mangoh to PC but I receive nothing from PC to mangoh.

Maybe someone have already take this problem ?  
I would be grateful if someone have a program example or a tutorial.

Best regards,

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**Author:** ![shib](https://avatars.discourse-cdn.com/v4/letter/s/f6c823/32.png) [@shib](https://mangoh.discourse.group/u/shib)\
**Post date:** [May 9, 2019, 9:04am UTC](https://mangoh.discourse.group/t/how-to-communicate-with-uart-1-wp8548-mangoh-red/2570/2 "2019-05-09T09:04:30Z")

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The UART on the IoT connector is 1.8V. What FTDI cable are you using?  
If the high threshold for the FTDI cable is below 1.8V, you can get away with a voltage divider on the TX.

I do this to communicate with a 3V device and a voltage divider with 2 10k resistors and everything works well, but if you can get the uart working on the RPi header that will be the easiest for you.

I had some serious issues with the uart on the RPi header, if you want to know what that looks like you can view my post history.

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**Author:** ![awneil](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/awneil/32/486_2.png) [@awneil](https://mangoh.discourse.group/u/awneil)\
**Post date:** [May 15, 2019, 11:00pm UTC](https://mangoh.discourse.group/t/how-to-communicate-with-uart-1-wp8548-mangoh-red/2570/3 "2019-05-15T23:00:57Z")

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FTDI have 1.8V cables available:

> **[TTL-232RG-VREG1V8-WE](https://ftdi-uk.shop/collections/usb-cables-ttl/products/ttl-232rg-vreg1v8-we)**
>
> TTL-232RG-VREG1V8-WE: USB cable with wire-ended +1.8V logic level UART connections and +1.8V / 100mA rated power output.The TTL-232RG-VREG1V8-WE uses a FT232RQ IC which is housed inside the USB 'A' connector, and is terminated at the end of a 1.8...

> **[DS\_TTL-232RG\_CABLES.pdf](https://www.ftdichip.com/Support/Documents/DataSheets/Cables/DS_TTL-232RG_CABLES.pdf)**
>
> 598.02 KB