# Using Serial/UART\_2? **URL:** \ **Category:** Firmware\ **Tags:** boron\ **Created:** [August 28, 2019, 3:36pm UTC](https://community.particle.io/t/using-serial-uart-2/51914 "2019-08-28T15:36:18Z")\ **Posts on this page:** 13\ **Page:** 1
**Author:** ![psychogenic](https://avatars.discourse-cdn.com/v4/letter/p/3be4f8/32.png) [@psychogenic](https://community.particle.io/u/psychogenic)\ **Post date:** [August 28, 2019, 3:36pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/1 "2019-08-28T15:36:18Z")
Aloha, I’m at a loss as to how to go about using the UART2 pins, marked in the [Boron pinout](https://docs.particle.io/datasheets/cellular/boron-datasheet/#pinout-diagram) as D4 and D5: ![boron-uart2pins](https://us1.discourse-cdn.com/flex026/uploads/particle/original/3X/c/0/c01e253e3e2711eb5ba9fbf6742ebdadeeafc55c.png) The Boron uses NRF\_UARTE0 on the tx/rx (D9/D10) pair, which I’m already using, and the NRF\_UARTE1 for comms with the SARA modem, but can we config the NRF\_UART0 to these pins, remap UARTE1 to these marked pins or any way of using these UART2\_\* pins? Thanks! ---
**Author:** ![nrobinson2000](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/nrobinson2000/32/15624_2.png) [@nrobinson2000](https://community.particle.io/u/nrobinson2000)\ **Post date:** [August 28, 2019, 5:13pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/2 "2019-08-28T17:13:40Z")
I’m not sure if it’s possible, but @BDub or @Dave might know. ---
**Author:** ![ScruffR](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/scruffr/32/6952_2.png) [@ScruffR](https://community.particle.io/u/ScruffR)\ **Post date:** [August 28, 2019, 5:40pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/3 "2019-08-28T17:40:23Z")
This image and pin map refers to Xenon _ **not** _ Boron. The Boron datasheet only lists _ **one** _ UART since the second one is already used to communicate with the ublox module. [https://docs.particle.io/datasheets/cellular/boron-datasheet/#peripherals-and-gpio](https://docs.particle.io/datasheets/cellular/boron-datasheet/#peripherals-and-gpio) ![image](https://us1.discourse-cdn.com/flex026/uploads/particle/original/3X/3/b/3bc012ba087dbe5305d7fbd3ee3ee9a5ff76b325.png) ---
**Author:** ![psychogenic](https://avatars.discourse-cdn.com/v4/letter/p/3be4f8/32.png) [@psychogenic](https://community.particle.io/u/psychogenic)\ **Post date:** [August 28, 2019, 5:42pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/4 "2019-08-28T17:42:04Z")
Damn, it’s from the pdf that’s linked on [the boron pinout page](https://docs.particle.io/datasheets/cellular/boron-datasheet/#pinout-diagram). ---
**Author:** ![ScruffR](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/scruffr/32/6952_2.png) [@ScruffR](https://community.particle.io/u/ScruffR)\ **Post date:** [August 28, 2019, 5:43pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/5 "2019-08-28T17:43:04Z")
Uhm no. The link you posted there does show this for me ![image](https://us1.discourse-cdn.com/flex026/uploads/particle/original/3X/1/e/1ea04644162c20c9ad10dfc3e63c1b531ae28c68.png) ---
**Author:** ![psychogenic](https://avatars.discourse-cdn.com/v4/letter/p/3be4f8/32.png) [@psychogenic](https://community.particle.io/u/psychogenic)\ **Post date:** [August 28, 2019, 5:43pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/6 "2019-08-28T17:43:23Z")
yeah… click on it. ---
**Author:** ![ScruffR](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/scruffr/32/6952_2.png) [@ScruffR](https://community.particle.io/u/ScruffR)\ **Post date:** [August 28, 2019, 5:43pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/7 "2019-08-28T17:43:56Z")
I did. What browser are you using? ---
**Author:** ![psychogenic](https://avatars.discourse-cdn.com/v4/letter/p/3be4f8/32.png) [@psychogenic](https://community.particle.io/u/psychogenic)\ **Post date:** [August 28, 2019, 5:44pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/8 "2019-08-28T17:44:32Z")
Firefox… the link points to [https://docs.particle.io/assets/images/boron/boron-pinout-v1.0.pdf](https://docs.particle.io/assets/images/boron/boron-pinout-v1.0.pdf) ---
**Author:** ![psychogenic](https://avatars.discourse-cdn.com/v4/letter/p/3be4f8/32.png) [@psychogenic](https://community.particle.io/u/psychogenic)\ **Post date:** [August 28, 2019, 5:46pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/9 "2019-08-28T17:46:10Z")
That PDF has an image with “xenon” but kindof assumed it was just a case of identical pinout. not super. ---
**Author:** ![ScruffR](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/scruffr/32/6952_2.png) [@ScruffR](https://community.particle.io/u/ScruffR)\ **Post date:** [August 28, 2019, 5:49pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/10 "2019-08-28T17:49:57Z")
Yup, that is a Firefox (Acrobat Reader) quirk. This PDF contains multiple layers but Firefox PDF rendering obviously can’t interpret that properly. Try Chrome, Edge or even Internet Explorer - they render the file correctly. ---
**Author:** ![psychogenic](https://avatars.discourse-cdn.com/v4/letter/p/3be4f8/32.png) [@psychogenic](https://community.particle.io/u/psychogenic)\ **Post date:** [August 28, 2019, 5:50pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/11 "2019-08-28T17:50:47Z")
Oh, noes… we’re back to the days of “this site best viewed in X”!! Ok, well I guess its going to be a case of bit-banging… thanks. ---
**Author:** ![rickkas7](https://sea2.discourse-cdn.com/flex026/user_avatar/community.particle.io/rickkas7/32/8681_2.png) [@rickkas7](https://community.particle.io/u/rickkas7)\ **Post date:** [August 28, 2019, 9:44pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/12 "2019-08-28T21:44:41Z")
On Gen 3 devices I recommend using the SC16IS7xx I2C or SPI UARTs and this library to add additional serial ports. > **[rickkas7/SC16IS740RK](https://github.com/rickkas7/SC16IS740RK)** > > Interface to SC16IS740 UART for Particle devices. Contribute to rickkas7/SC16IS740RK development by creating an account on GitHub. ---
**Author:** ![psychogenic](https://avatars.discourse-cdn.com/v4/letter/p/3be4f8/32.png) [@psychogenic](https://community.particle.io/u/psychogenic)\ **Post date:** [August 28, 2019, 9:54pm UTC](https://community.particle.io/t/using-serial-uart-2/51914/13 "2019-08-28T21:54:52Z")
Oh, that’s sweet–thanks for the suggestion (and library!)