# Communication with HL8548 using Uart1 **URL:** \ **Category:** mangOH Green\ **Created:** [March 14, 2017, 5:05pm UTC](https://mangoh.discourse.group/t/communication-with-hl8548-using-uart1/430 "2017-03-14T17:05:31Z")\ **Posts on this page:** 1\ **Showing post:** 14
**Author:** ![Alex](https://avatars.discourse-cdn.com/v4/letter/a/db5fbb/32.png) [@Alex](https://mangoh.discourse.group/u/Alex)\ **Post date:** [May 10, 2018, 7:39pm UTC](https://mangoh.discourse.group/t/communication-with-hl8548-using-uart1/430/14 "2018-05-10T19:39:14Z")
> [@UART on IoT Connector](https://mangoh.discourse.group/t/uart-on-iot-connector/1246/5): > > For those who may read this post in the future, here are some tips to get UART1 working: I have got the UART1 working on the Raspberry Pi header to send and receive AT commands to the cellular chips. I am using an external microcontroller to talk UART to both the WP and HL chips. There is a level shifter on the mangOH Red board for the RPi header, so this is the reason I am using it (CF3 modules are 1.8V, but my uC is 3.3). David will have his board soon that will be able to connect to the … --- _[View the full topic](https://mangoh.discourse.group/t/communication-with-hl8548-using-uart1/430)._