# \#uart **URL:** https://forums.digi.com/tag/uart/98.md [Latest](https://forums.digi.com/latest.md) · [Categories](https://forums.digi.com/categories.md) · [Tags](https://forums.digi.com/tags.md) --- ## [CC8X MCA UART Serial Port Unsupported (DEY 5.0)](https://forums.digi.com/t/cc8x-mca-uart-serial-port-unsupported-dey-5-0/38649)
**Author:** [@haobc](https://forums.digi.com/u/haobc)\ **Replies:** 1\ **Last updated:** [August 18, 2026, 3:41pm UTC](https://forums.digi.com/t/cc8x-mca-uart-serial-port-unsupported-dey-5-0/38649 "2026-08-18T15:41:31Z")
I am trying to use the DEY-5.0 BSP on our CC8X SBC Pro, and am getting the following error with MCA-UART. mca-uart mca-som-uart: UART is not supported in MCA firmware v1.02. Looking at linux/drivers/mfd/mca-core.c at v… --- ## [UART moisture sensor in API mode](https://forums.digi.com/t/uart-moisture-sensor-in-api-mode/25810)
**Author:** [@MykolaTarasenko](https://forums.digi.com/u/MykolaTarasenko)\ **Replies:** 9\ **Last updated:** [June 7, 2023, 6:35pm UTC](https://forums.digi.com/t/uart-moisture-sensor-in-api-mode/25810 "2023-06-07T18:35:17Z")
Hello everyone, i am new in zigbee networks, i have 1 coordinator and 5 routers. I need to transmit data from sensor node. This node includes 2 channel moisture sensor, xbee3 - pro. We succeeded to transmit data from my … --- ## [micropython machine uart.write() limit](https://forums.digi.com/t/micropython-machine-uart-write-limit/23245)
**Author:** [@ajsPillar](https://forums.digi.com/u/ajsPillar)\ **Replies:** 1\ **Last updated:** [September 29, 2022, 8:19am UTC](https://forums.digi.com/t/micropython-machine-uart-write-limit/23245 "2022-09-29T08:19:18Z")
I am using a Xbee3 LTE-m Module with micropython scripts. I am running into a strange issue where I can only send 255 bytes of a 348 byte string through the secondary UART. I have verified with a logic analyzer that on… --- ## [Support for UART2, 2-wire RS-232 on ConnectCore 6UL SBC Pro](https://forums.digi.com/t/support-for-uart2-2-wire-rs-232-on-connectcore-6ul-sbc-pro/23071)
**Author:** [@csalts](https://forums.digi.com/u/csalts)\ **Replies:** 1\ **Last updated:** [June 15, 2022, 6:56pm UTC](https://forums.digi.com/t/support-for-uart2-2-wire-rs-232-on-connectcore-6ul-sbc-pro/23071 "2022-06-15T18:56:49Z")
We are working with the ConnectCore 6UL SBC Pro and are looking to add support for UART2, 2-wire RS-232. The ConnectCore 6UL SBC Pro Hardware Reference Manual (linked below) says “I/O expander UART2, 2-wire RS-232 port i… --- ## [XBee3 micropython uart communication](https://forums.digi.com/t/xbee3-micropython-uart-communication/22902)
**Author:** [@KhorCJ](https://forums.digi.com/u/KhorCJ)\ **Replies:** 3\ **Last updated:** [January 20, 2022, 10:29am UTC](https://forums.digi.com/t/xbee3-micropython-uart-communication/22902 "2022-01-20T10:29:06Z")
Hi, I am using XBee3 to communicate with a meter through RS485. Refer to https://www.digi.com/resources/documentation/Digidocs/90002219/#reference/r\_uart\_constants.htm?TocPath=Access%2520the%2520primary%2520UART%257C\_\_\_… --- ## [Echo ALL endpoint messages out the UART?](https://forums.digi.com/t/echo-all-endpoint-messages-out-the-uart/22876)
**Author:** [@mcavoya](https://forums.digi.com/u/mcavoya)\ **Replies:** 4\ **Last updated:** [January 7, 2022, 8:30am UTC](https://forums.digi.com/t/echo-all-endpoint-messages-out-the-uart/22876 "2022-01-07T08:30:10Z")
To be clear, this question is about using an XBee3 as an end device. I have an XBee S2C (configured as a coordinator) plugged into a Raspberry PI (running the latest Home Assistant OS). I have my Zigbee network up and r… --- ## [MODBUS implementation in STM32F103C8T6 with STM32 official core in Arduino IDE](https://forums.digi.com/t/modbus-implementation-in-stm32f103c8t6-with-stm32-official-core-in-arduino-ide/22717)
**Author:** [@mustaq\_ahm](https://forums.digi.com/u/mustaq_ahm)\ **Replies:** 0\ **Last updated:** [October 1, 2021, 7:36am UTC](https://forums.digi.com/t/modbus-implementation-in-stm32f103c8t6-with-stm32-official-core-in-arduino-ide/22717 "2021-10-01T07:36:38Z")
Hello all, Good Day! I have came here several times, and and asked some question here is overview of what I have in my mind and my questions. I am working on my Master Thesis. I would like to implement Modbus RTU prot… --- ## [ConnectCore 6 Plus SBC UART](https://forums.digi.com/t/connectcore-6-plus-sbc-uart/22607)
**Author:** [@simonongsk](https://forums.digi.com/u/simonongsk)\ **Replies:** 3\ **Last updated:** [August 20, 2021, 9:37am UTC](https://forums.digi.com/t/connectcore-6-plus-sbc-uart/22607 "2021-08-20T09:37:46Z")
Hi: I have the ConnectCore 6 Plus Development Kit. I would like to know how to use the following ports as “normal” RS232. The application I have work with Linux PC (with 3 RS232 ports “dev/ttyS1”, “/dev/ttyS2”, “/dev/tt… --- ## [UART and RS485 for DigiConnecore devlopments Kit](https://forums.digi.com/t/uart-and-rs485-for-digiconnecore-devlopments-kit/22554)
**Author:** [@simonongsk](https://forums.digi.com/u/simonongsk)\ **Replies:** 6\ **Last updated:** [August 18, 2021, 9:07am UTC](https://forums.digi.com/t/uart-and-rs485-for-digiconnecore-devlopments-kit/22554 "2021-08-18T09:07:52Z")
Hi: Digi ConnectCore 6Plus Devlopment Kits https://www.digi.com/resources/documentation/digidocs/embedded/dey/3.0/cc6plus/bsp\_r\_uart\_cc6cc6qp UART1 and UART3 are 4-wires, RS-232 level. UART5 is 4-wires, TTL level. Q… --- ## [How do I get the xbee3 (NB-IoT) device to read a string from another device over a com port?](https://forums.digi.com/t/how-do-i-get-the-xbee3-nb-iot-device-to-read-a-string-from-another-device-over-a-com-port/22567)
**Author:** [@CarlMisco](https://forums.digi.com/u/CarlMisco)\ **Replies:** 1\ **Last updated:** [July 26, 2021, 10:09am UTC](https://forums.digi.com/t/how-do-i-get-the-xbee3-nb-iot-device-to-read-a-string-from-another-device-over-a-com-port/22567 "2021-07-26T10:09:31Z")
I have a psoc4 BLE board that I’m trying to send a string (“Hello World!”) to the xbee3 over a UART connection. The Psoc4 board is attached to the PC over com9, and I have successfully sent a string to a Tera Term termin… --- ## [Cannot interface XBee with LPC1769 via UART](https://forums.digi.com/t/cannot-interface-xbee-with-lpc1769-via-uart/17369)
**Author:** [@lucasmf](https://forums.digi.com/u/lucasmf)\ **Replies:** 5\ **Last updated:** [June 11, 2021, 10:26am UTC](https://forums.digi.com/t/cannot-interface-xbee-with-lpc1769-via-uart/17369 "2021-06-11T10:26:15Z")
Hello, I need some help to communicate XBee S2C via UART with my LPC1769. My problem is that when I send “+++” command via UART the XBee module doesn’t answer “OK”. The LPC is sending the data fine because if I connect … --- ## [UART interrupt](https://forums.digi.com/t/uart-interrupt/22446)
**Author:** [@mariano90](https://forums.digi.com/u/mariano90)\ **Replies:** 2\ **Last updated:** [May 28, 2021, 10:43am UTC](https://forums.digi.com/t/uart-interrupt/22446 "2021-05-28T10:43:11Z")
Hi. We are working with the Digi Xbee Cellular 3 LTE-M/NB-IoT with micropython. We are unable to configure the interrupt for the uart or any other interrupt. Aparently micropython has no support for this. Wath exactly ha… --- ## [Since I deleted UART module in Codewarrior, I get this error](https://forums.digi.com/t/since-i-deleted-uart-module-in-codewarrior-i-get-this-error/18197)
**Author:** [@herrmattoon](https://forums.digi.com/u/herrmattoon)\ **Replies:** 3\ **Last updated:** [April 28, 2021, 9:54pm UTC](https://forums.digi.com/t/since-i-deleted-uart-module-in-codewarrior-i-get-this-error/18197 "2021-04-28T21:54:47Z")
Hi all, Today, I wanted to delete the UART of my project to use the pins 3 and 4 (SMT module) as gpios. Unfortunately, after I started the project’s building, I got this message : Symbol TERMIO\_PutChar in file C:/Frees… --- ## [ImportError: no module named ????](https://forums.digi.com/t/importerror-no-module-named/22361)
**Author:** [@Mohamad-Badr](https://forums.digi.com/u/Mohamad-Badr)\ **Replies:** 4\ **Last updated:** [April 26, 2021, 9:23am UTC](https://forums.digi.com/t/importerror-no-module-named/22361 "2021-04-26T09:23:32Z")
Hello, i am trying to test the UART connection in the xbee grove board, but when I am trying to import the UART LIBRARY i have this error “ImportError: cannot import name UART”. I have this error with many other librar… --- ## [DIO Pins not working without UART connected to computer](https://forums.digi.com/t/dio-pins-not-working-without-uart-connected-to-computer/21998)
**Author:** [@Antoine](https://forums.digi.com/u/Antoine)\ **Replies:** 11\ **Last updated:** [April 19, 2021, 11:45pm UTC](https://forums.digi.com/t/dio-pins-not-working-without-uart-connected-to-computer/21998 "2021-04-19T23:45:17Z")
Hello everyone, My goal: I am making a simple remote controller with a XBee3, an LCD screen and 6 push buttons. The idea is to use the i2c to communicate with the LCD screen and 6 DIO to check on the buttons. The good… --- ## [How to access UART using XBEE3, DEV board and XCTU](https://forums.digi.com/t/how-to-access-uart-using-xbee3-dev-board-and-xctu/22287)
**Author:** [@Rob\_Sutherland](https://forums.digi.com/u/Rob_Sutherland)\ **Replies:** 1\ **Last updated:** [March 22, 2021, 9:11am UTC](https://forums.digi.com/t/how-to-access-uart-using-xbee3-dev-board-and-xctu/22287 "2021-03-22T09:11:59Z")
I have a Digi XBee 3 Cellular LTE-M/NB-IoT modem, it is installed on a XBIB-U-DEV development board and has a SIM card installed. All works properly and passes all the original hello world tutorials. I am trying to simu… --- ## [Change UART pins on Pro S2B using AT commands](https://forums.digi.com/t/change-uart-pins-on-pro-s2b-using-at-commands/22258)
**Author:** [@emi](https://forums.digi.com/u/emi)\ **Replies:** 1\ **Last updated:** [March 8, 2021, 9:38am UTC](https://forums.digi.com/t/change-uart-pins-on-pro-s2b-using-at-commands/22258 "2021-03-08T09:38:55Z")
Is it possible to change the DIN/DOUT pins on a Pro S2B using AT commands? If not, is there a way to listen/send to the output on other pins, like D2/D3? For context: There is constant data flow between devices A1 and … --- ## [Connectcore 6UL pro UARTs](https://forums.digi.com/t/connectcore-6ul-pro-uarts/22203)
**Author:** [@cstanton](https://forums.digi.com/u/cstanton)\ **Replies:** 1\ **Last updated:** [February 12, 2021, 9:17am UTC](https://forums.digi.com/t/connectcore-6ul-pro-uarts/22203 "2021-02-12T09:17:03Z")
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 … --- ## [How can I use XBEE mesh boards for telemetry?](https://forums.digi.com/t/how-can-i-use-xbee-mesh-boards-for-telemetry/22170)
**Author:** [@cujo612](https://forums.digi.com/u/cujo612)\ **Replies:** 3\ **Last updated:** [January 29, 2021, 10:05am UTC](https://forums.digi.com/t/how-can-i-use-xbee-mesh-boards-for-telemetry/22170 "2021-01-29T10:05:23Z")
I am working on getting a pixhawk to transmit data wirelessly to my computer running qgroundcontrol or another similar program. My issue right now is that when I plug the telemetry cords into the pixhawk to the uart pins… --- ## [ConnectCore 6UL SBC Pro UART2 does not work in different baudrates](https://forums.digi.com/t/connectcore-6ul-sbc-pro-uart2-does-not-work-in-different-baudrates/22102)
**Author:** [@serhankars](https://forums.digi.com/u/serhankars)\ **Replies:** 2\ **Last updated:** [January 5, 2021, 12:55pm UTC](https://forums.digi.com/t/connectcore-6ul-sbc-pro-uart2-does-not-work-in-different-baudrates/22102 "2021-01-05T12:55:44Z")
I wrote a little application that succesfully reads data from UART2 of ConnectCore 6UL SBC Pro (Pin 12 of J29) when data source is sending in 1 MBd bitrate. When the data source is sending in 5MBd, my app hangs when ope… --- ## [CC6UL can not make UART2 receive data](https://forums.digi.com/t/cc6ul-can-not-make-uart2-receive-data/22031)
**Author:** [@mkonnov](https://forums.digi.com/u/mkonnov)\ **Replies:** 6\ **Last updated:** [December 10, 2020, 1:38pm UTC](https://forums.digi.com/t/cc6ul-can-not-make-uart2-receive-data/22031 "2020-12-10T13:38:17Z")
I need to configure UART2 to send/receive data. I can send the from i.MX, but can not receive. I took a look at 44 pin with oscilloscope and I see that it’s strongly pulled high whenever there’s no strong pullups at sc… --- ## [UART missing data on ConnectCore 6UL](https://forums.digi.com/t/uart-missing-data-on-connectcore-6ul/21856)
**Author:** [@anupam\_mz](https://forums.digi.com/u/anupam_mz)\ **Replies:** 1\ **Last updated:** [October 8, 2020, 3:23pm UTC](https://forums.digi.com/t/uart-missing-data-on-connectcore-6ul/21856 "2020-10-08T15:23:17Z")
I am trying to send data over UART to ConnectCore 6UL module from my Windows machine. I am using the console port (UART5) on 6UL. Here is the python code I use on my windows machine to send data: import serial comm = … --- ## [Using UART connected K30 CO2 sensor with Digi Xbee3 Zigbee 3.0 programmable module](https://forums.digi.com/t/using-uart-connected-k30-co2-sensor-with-digi-xbee3-zigbee-3-0-programmable-module/21648)
**Author:** [@rdxbeezbee](https://forums.digi.com/u/rdxbeezbee)\ **Replies:** 1\ **Last updated:** [August 10, 2020, 1:13pm UTC](https://forums.digi.com/t/using-uart-connected-k30-co2-sensor-with-digi-xbee3-zigbee-3-0-programmable-module/21648 "2020-08-10T13:13:05Z")
Hi, I have a set of Worldwide mesh kit. I want to connect an K30 CO2 sensor using UART interface to one of the programmable modules using MicroPython. When I try “from machine import UART” from MicroPython terminal I g… --- ## [Can't activate UART and disable SPI on xbee 3](https://forums.digi.com/t/cant-activate-uart-and-disable-spi-on-xbee-3/21539)
**Author:** [@maxim\_dorogov](https://forums.digi.com/u/maxim_dorogov)\ **Replies:** 4\ **Last updated:** [July 9, 2020, 12:46pm UTC](https://forums.digi.com/t/cant-activate-uart-and-disable-spi-on-xbee-3/21539 "2020-07-09T12:46:56Z")
Hi guys! After a firmware update from 1003 to 1009 my device (xbee 3) stopped sending and receiving commands via uart. The SPI pins are all enabled by default since the update. I tried to disable them but the XCTU says t… --- ## [Why is an Xbee dropping data packets occasionally?](https://forums.digi.com/t/why-is-an-xbee-dropping-data-packets-occasionally/21179)
**Author:** [@geoffrj](https://forums.digi.com/u/geoffrj)\ **Replies:** 8\ **Last updated:** [March 20, 2020, 12:23pm UTC](https://forums.digi.com/t/why-is-an-xbee-dropping-data-packets-occasionally/21179 "2020-03-20T12:23:09Z")
I’m sending API data packets on a Series 1 Xbee, 802.15.4, once every 25ms. The packet transmits successfully and is received by a 2nd Xbee successfully almost all of the time but every minute or so at random intervals, … --- ## [Why do 16-bit addressed packets of Tx data always appear at the receiving Xbee as 64 bit messages?](https://forums.digi.com/t/why-do-16-bit-addressed-packets-of-tx-data-always-appear-at-the-receiving-xbee-as-64-bit-messages/21198)
**Author:** [@geoffrj](https://forums.digi.com/u/geoffrj)\ **Replies:** 1\ **Last updated:** [March 17, 2020, 9:18am UTC](https://forums.digi.com/t/why-do-16-bit-addressed-packets-of-tx-data-always-appear-at-the-receiving-xbee-as-64-bit-messages/21198 "2020-03-17T09:18:36Z")
In the situation of having two Xbees set up as Coordinator and End-Device and associated to each other, if I send a 16-bit addressed broadcast message from End-Device to Coordinator, or vice versa, the data packet always… --- ## [xbee with microcontrollers e.g. nodemcu.](https://forums.digi.com/t/xbee-with-microcontrollers-e-g-nodemcu/21077)
**Author:** [@prem12345](https://forums.digi.com/u/prem12345)\ **Replies:** 2\ **Last updated:** [January 30, 2020, 8:05am UTC](https://forums.digi.com/t/xbee-with-microcontrollers-e-g-nodemcu/21077 "2020-01-30T08:05:25Z")
Hello, are there libraries in micropython for xbee support? I want to connect nodemcu with xbee (via uart) and communicate with another xbee (nodemcu). I know there are libraries for micropython for the xbee device itsel… --- ## [Test for UART data, XBEE3 and Micropython (kbhit)](https://forums.digi.com/t/test-for-uart-data-xbee3-and-micropython-kbhit/20989)
**Author:** [@aadgi](https://forums.digi.com/u/aadgi)\ **Replies:** 2\ **Last updated:** [December 23, 2019, 10:24am UTC](https://forums.digi.com/t/test-for-uart-data-xbee3-and-micropython-kbhit/20989 "2019-12-23T10:24:09Z")
Is it possible to test for data available from the UART? This commonly implemented with kbhit(), or nonblocking, modes. I can wait for one character with this: \> key = stdin.buffer.read(1) This doesn’t return until … --- ## [Why does XCTU discover and communicate with remote nodes only when their DIN pin is high?](https://forums.digi.com/t/why-does-xctu-discover-and-communicate-with-remote-nodes-only-when-their-din-pin-is-high/19771)
**Author:** [@turok1997](https://forums.digi.com/u/turok1997)\ **Replies:** 1\ **Last updated:** [October 28, 2019, 9:57am UTC](https://forums.digi.com/t/why-does-xctu-discover-and-communicate-with-remote-nodes-only-when-their-din-pin-is-high/19771 "2019-10-28T09:57:01Z")
I want to use XBee with only SPI and turning off UART (which I am not sure how to do). For this, in I/O settings in XCTU, I set pins 4, 11, 17, 18 to work in SPI equivalent pins and then connect corresponding pins to an … --- ## [Troubles configuring Xbee with AT commands from microcontroller](https://forums.digi.com/t/troubles-configuring-xbee-with-at-commands-from-microcontroller/20760)
**Author:** [@henmill](https://forums.digi.com/u/henmill)\ **Replies:** 2\ **Last updated:** [September 12, 2019, 2:40pm UTC](https://forums.digi.com/t/troubles-configuring-xbee-with-at-commands-from-microcontroller/20760 "2019-09-12T14:40:42Z")
I am working on a battery-powered remote control project using XBee Pro S2C (intend to use XBEE3 in future. The goal is to not have to use XCTU to configure the modules, and instead have an 8-bit PIC send AT commands ove… [Next page](https://forums.digi.com/tag/uart/98.md?match_all_tags=true&page=1&tags%5B%5D=uart)