# \#serial **URL:** https://forums.digi.com/tag/serial/51.md [Latest](https://forums.digi.com/latest.md) · [Categories](https://forums.digi.com/categories.md) · [Tags](https://forums.digi.com/tags.md) --- ## [Variable transmission delay even when UART buffer is empty](https://forums.digi.com/t/variable-transmission-delay-even-when-uart-buffer-is-empty/38237)
**Author:** [@dereklam](https://forums.digi.com/u/dereklam)\ **Replies:** 3\ **Last updated:** [February 27, 2026, 12:46pm UTC](https://forums.digi.com/t/variable-transmission-delay-even-when-uart-buffer-is-empty/38237 "2026-02-27T12:46:26Z")
I’m working with the XBee-Pro 900HP S3B modules for setting up a triggered sensor telemetry. I’m using a remote AT command request to set an IO pin on a remote trigger device. Critically, these AT remote requests have AC… --- ## [Serial port not working on newest Digi Firmware](https://forums.digi.com/t/serial-port-not-working-on-newest-digi-firmware/33379)
**Author:** [@grant.goode](https://forums.digi.com/u/grant.goode)\ **Replies:** 3\ **Last updated:** [February 2, 2026, 7:17pm UTC](https://forums.digi.com/t/serial-port-not-working-on-newest-digi-firmware/33379 "2026-02-02T19:17:45Z")
On my Digi Connect EZ Mini, I’m attempting to access the serial port on the device with a Python script. I’ve replaced the usual script I use with a basic one that connects to the port and reads/writes data in a loop eve… --- ## [Difference between RCM6760 board module numbers and revisions, specifically with the serial interface](https://forums.digi.com/t/difference-between-rcm6760-board-module-numbers-and-revisions-specifically-with-the-serial-interface/37819)
**Author:** [@andrewbarnes](https://forums.digi.com/u/andrewbarnes)\ **Replies:** 1\ **Last updated:** [September 10, 2025, 11:18am UTC](https://forums.digi.com/t/difference-between-rcm6760-board-module-numbers-and-revisions-specifically-with-the-serial-interface/37819 "2025-09-10T11:18:01Z")
I have two RCM6760 boards and noticed they act differently with the same program, specifically when it comes to the serial interface. 20-101-1321 h is able to establish serial communications on it’s 30010422-03 REV B PCB… --- ## [Function : xxxx not found in xctu](https://forums.digi.com/t/function-xxxx-not-found-in-xctu/36949)
**Author:** [@Mesad55](https://forums.digi.com/u/Mesad55)\ **Replies:** 1\ **Last updated:** [May 25, 2025, 10:07pm UTC](https://forums.digi.com/t/function-xxxx-not-found-in-xctu/36949 "2025-05-25T22:07:18Z")
Hi everyone , I have non programmable xbee pro s3b module. When I discovered it from xctu, there is no firmware inside of it, when I try to upload a firmware form internet, it gives me error which indicates that it could… --- ## [Pro S2B to Pro S2B AT Coordinator to Router problems](https://forums.digi.com/t/pro-s2b-to-pro-s2b-at-coordinator-to-router-problems/32725)
**Author:** [@Steve\_L](https://forums.digi.com/u/Steve_L)\ **Replies:** 4\ **Last updated:** [October 22, 2024, 2:26pm UTC](https://forums.digi.com/t/pro-s2b-to-pro-s2b-at-coordinator-to-router-problems/32725 "2024-10-22T14:26:18Z")
I cant get my two XBee Pro XBP24BZ7 to communicate with each other over XCTU : One has ZigBee Router AT 22A7 the other has ZigBee Coordinator AT 20A7 firmware. Both have the same Pan ID and Baud rates Both have SH & … --- ## [WR31 serial port status indicate a few bytes sent every second](https://forums.digi.com/t/wr31-serial-port-status-indicate-a-few-bytes-sent-every-second/28448)
**Author:** [@Flodis](https://forums.digi.com/u/Flodis)\ **Replies:** 2\ **Last updated:** [September 29, 2024, 6:42pm UTC](https://forums.digi.com/t/wr31-serial-port-status-indicate-a-few-bytes-sent-every-second/28448 "2024-09-29T18:42:38Z")
The serial port is configured for RS485 half duplex and modbus master enabled for the port. The strange thing is the serial port status “Bytes Sent” keeps incrementing by two bytes every second no matter if modbus maste… --- ## [Send Serial Command Digi one sp](https://forums.digi.com/t/send-serial-command-digi-one-sp/28469)
**Author:** [@devasundaram](https://forums.digi.com/u/devasundaram)\ **Replies:** 0\ **Last updated:** [November 19, 2023, 4:51pm UTC](https://forums.digi.com/t/send-serial-command-digi-one-sp/28469 "2023-11-19T16:51:19Z")
Hi, we are trying to connect a serial lab instrument to ethernet and fetch results from the instrument in a server. we have digi-one-sp connected to the host of the instrument. we have a serial port configured as tcp s… --- ## [Dgrp\_cfg\_node not creating tty ports](https://forums.digi.com/t/dgrp-cfg-node-not-creating-tty-ports/28372)
**Author:** [@Ancient](https://forums.digi.com/u/Ancient)\ **Replies:** 0\ **Last updated:** [November 10, 2023, 8:51pm UTC](https://forums.digi.com/t/dgrp-cfg-node-not-creating-tty-ports/28372 "2023-11-10T20:51:17Z")
I have downloaded and installed the dgrp\_1.9-41 driver on RHEL 9.2, 8.8, 7.9, and Ubuntu 22.04. All compiled successfully and show no errors during the build or installation process. When I use dgrp\_gui to configure, i… --- ## [RTS is set / asserted periodically on ConnectEZ 4i](https://forums.digi.com/t/rts-is-set-asserted-periodically-on-connectez-4i/23367)
**Author:** [@velosol](https://forums.digi.com/u/velosol)\ **Replies:** 3\ **Last updated:** [May 29, 2023, 3:08pm UTC](https://forums.digi.com/t/rts-is-set-asserted-periodically-on-connectez-4i/23367 "2023-05-29T15:08:01Z")
I have a Connect EZ4i and I would like to use the RS232 RTS pin to control the state of a device (i.e. the device has a pin that acts as a digital switch \>2V is ‘on’ and \<⅔V is ‘off’). I have had success toggling the sta… --- ## [PortServer TS4 ME is automatically changes baud rate for TCP connection](https://forums.digi.com/t/portserver-ts4-me-is-automatically-changes-baud-rate-for-tcp-connection/25248)
**Author:** [@SystemsTech](https://forums.digi.com/u/SystemsTech)\ **Replies:** 0\ **Last updated:** [April 28, 2023, 5:55pm UTC](https://forums.digi.com/t/portserver-ts4-me-is-automatically-changes-baud-rate-for-tcp-connection/25248 "2023-04-28T17:55:11Z")
I’m having an issue with the baud rate auto changing on a TCP Sockets profile. The digi is connected to a scale device via rs232. I have a couple windows touch screens and a server looking at the raw port of the digi(210… --- ## [WR31 modbus baudrate?](https://forums.digi.com/t/wr31-modbus-baudrate/23299)
**Author:** [@Flodis](https://forums.digi.com/u/Flodis)\ **Replies:** 1\ **Last updated:** [December 13, 2022, 10:14pm UTC](https://forums.digi.com/t/wr31-modbus-baudrate/23299 "2022-12-13T22:14:29Z")
When the Modbus gateway feature is enabled What will be the baud rate of the serial port? The manual does not mention if it uses Modbus -RTU or ASCII on the serial? Does setting “fixed address” to zero obtain device ad… --- ## [Serial port in XCTU greyed out](https://forums.digi.com/t/serial-port-in-xctu-greyed-out/23190)
**Author:** [@sportzcast](https://forums.digi.com/u/sportzcast)\ **Replies:** 3\ **Last updated:** [August 9, 2022, 7:28am UTC](https://forums.digi.com/t/serial-port-in-xctu-greyed-out/23190 "2022-08-09T07:28:44Z")
I am configuring a XBP9B-DPWT via XCTU. I am able to configure the module and see active data coming in via light flashing on the Digi xbee development board. I am unable to open the serial console. Its configuration … --- ## [Is it possible to connect two Digi connect SP via a serial bridge?](https://forums.digi.com/t/is-it-possible-to-connect-two-digi-connect-sp-via-a-serial-bridge/23171)
**Author:** [@Satcom805](https://forums.digi.com/u/Satcom805)\ **Replies:** 1\ **Last updated:** [July 27, 2022, 9:31pm UTC](https://forums.digi.com/t/is-it-possible-to-connect-two-digi-connect-sp-via-a-serial-bridge/23171 "2022-07-27T21:31:56Z")
I am trying to connect a device that needs to be hardwired locally. I am trying to put the remote device in another building. My thinking is to try using two Digi connect boxes one on side using our network to connect b… --- ## [Digimesh splits data in random places while transferring via USB port](https://forums.digi.com/t/digimesh-splits-data-in-random-places-while-transferring-via-usb-port/23095)
**Author:** [@Ceranthor](https://forums.digi.com/u/Ceranthor)\ **Replies:** 1\ **Last updated:** [June 2, 2022, 10:28am UTC](https://forums.digi.com/t/digimesh-splits-data-in-random-places-while-transferring-via-usb-port/23095 "2022-06-02T10:28:51Z")
Hi i have problem with my digimesh when communicating with it via uart. Sometimes packages are splitter in random places to 2 or even 4 strings. I just cannot discover why it happened payload is 40 bytes but I get 5 byte… --- ## [Serial transmit speeds.](https://forums.digi.com/t/serial-transmit-speeds/23024)
**Author:** [@Zaemo](https://forums.digi.com/u/Zaemo)\ **Replies:** 1\ **Last updated:** [April 1, 2022, 10:23am UTC](https://forums.digi.com/t/serial-transmit-speeds/23024 "2022-04-01T10:23:35Z")
Hello again. I am trying once again to improve the transmission of serial data. You had advised me in the past to set my units to unicast TO = 0x40. I have MR set to 1. The problem is when I send long strings of MIDI… --- ## [\[WR31\] Use the serial port from within python](https://forums.digi.com/t/wr31-use-the-serial-port-from-within-python/23004)
**Author:** [@janztec](https://forums.digi.com/u/janztec)\ **Replies:** 1\ **Last updated:** [March 16, 2022, 3:33am UTC](https://forums.digi.com/t/wr31-use-the-serial-port-from-within-python/23004 "2022-03-16T03:33:40Z")
Hello, I want to utilize the serial port of the Digi WR31 from within Python. Is that possible? Pyserial is not listed as one of the supported python packages. --- ## [What is the Serial Voltage used on C/CON16 Units?](https://forums.digi.com/t/what-is-the-serial-voltage-used-on-c-con16-units/22973)
**Author:** [@darinbee](https://forums.digi.com/u/darinbee)\ **Replies:** 1\ **Last updated:** [March 14, 2022, 8:52am UTC](https://forums.digi.com/t/what-is-the-serial-voltage-used-on-c-con16-units/22973 "2022-03-14T08:52:44Z")
I have a customer that I have migrated from an older AccelePort C/CON-16 to a ConnectPort TS16 everything works except for one machine. I can communicate to the CNC machine using the C/CON-16 device but when I try using… --- ## [I want to run a cli 'display serial' command from the shell pompt](https://forums.digi.com/t/i-want-to-run-a-cli-display-serial-command-from-the-shell-pompt/22993)
**Author:** [@jonhedberg](https://forums.digi.com/u/jonhedberg)\ **Replies:** 0\ **Last updated:** [March 14, 2022, 8:50am UTC](https://forums.digi.com/t/i-want-to-run-a-cli-display-serial-command-from-the-shell-pompt/22993 "2022-03-14T08:50:55Z")
the cli commmand ‘display serial’ shows some important info for monitoring serial ports. I would like to script this by using ssh to run remote commands. Problem is, ‘display serial’ is not a UNIX type command. Is the… --- ## [Modbus TCP with Connect Me](https://forums.digi.com/t/modbus-tcp-with-connect-me/13082)
**Author:** [@adamwest](https://forums.digi.com/u/adamwest)\ **Replies:** 8\ **Last updated:** [March 10, 2022, 10:08am UTC](https://forums.digi.com/t/modbus-tcp-with-connect-me/13082 "2022-03-10T10:08:40Z")
I have recently acquired a Digi Connect ME device and board and am trying to configure it for Modbus TCP. To do this, I understand you need to change the serial port profile to “Industrial Automation” in the web interfa… --- ## [Digiport Connectport TS16](https://forums.digi.com/t/digiport-connectport-ts16/22907)
**Author:** [@jdjohnson](https://forums.digi.com/u/jdjohnson)\ **Replies:** 0\ **Last updated:** [January 14, 2022, 8:38am UTC](https://forums.digi.com/t/digiport-connectport-ts16/22907 "2022-01-14T08:38:35Z")
I am trying to connect to some legacy devices that I suspect may have some compatibility issues. The end state will be connecting an OPTO22 R1 brain connection through the TS16 to the legacy devices. For testing purpos… --- ## [Linking two Digi Portservers together?](https://forums.digi.com/t/linking-two-digi-portservers-together/22854)
**Author:** [@rpc7](https://forums.digi.com/u/rpc7)\ **Replies:** 0\ **Last updated:** [December 17, 2021, 1:45pm UTC](https://forums.digi.com/t/linking-two-digi-portservers-together/22854 "2021-12-17T13:45:40Z")
Hi, I have a serial device on two independent networks that I need to link together. There is one server and Digi on each network - I have the virtual COM port setup on both sides. Can I connect port 1 on Digi#1 to por… --- ## [What USB to Serial chip set is in the 900HP USB (PN (1P)50001879-01A)?](https://forums.digi.com/t/what-usb-to-serial-chip-set-is-in-the-900hp-usb-pn-1p-50001879-01a/22764)
**Author:** [@michaeka](https://forums.digi.com/u/michaeka)\ **Replies:** 1\ **Last updated:** [October 28, 2021, 11:45am UTC](https://forums.digi.com/t/what-usb-to-serial-chip-set-is-in-the-900hp-usb-pn-1p-50001879-01a/22764 "2021-10-28T11:45:43Z")
I’m trying to determine the chipset that’s in the XBEE RF Modem 900HP USB (PN (1P)50001879-01A). My PC seems to think it’s the FTDI chipset but I wanted to be sure. --- ## [XBee serial connection counting up](https://forums.digi.com/t/xbee-serial-connection-counting-up/18277)
**Author:** [@prc](https://forums.digi.com/u/prc)\ **Replies:** 2\ **Last updated:** [August 17, 2021, 11:29am UTC](https://forums.digi.com/t/xbee-serial-connection-counting-up/18277 "2021-08-17T11:29:52Z")
I’m a first time user having issues with my XBee radios. When i connect them via USB to my computer and open up a serial port, I see the XBee counting up like so: 00000128 00000129 0000012A 0000012B 0000012C 000001… --- ## [xbee 900hp not consuming and transmitting serial data from USB](https://forums.digi.com/t/xbee-900hp-not-consuming-and-transmitting-serial-data-from-usb/22553)
**Author:** [@Dhallett](https://forums.digi.com/u/Dhallett)\ **Replies:** 1\ **Last updated:** [July 19, 2021, 11:49pm UTC](https://forums.digi.com/t/xbee-900hp-not-consuming-and-transmitting-serial-data-from-usb/22553 "2021-07-19T23:49:24Z")
I have 2 xbee pro 900hp 200k RF modems setup to act in transparent mode so I can stream data from a GPS from my local xbee to a remote xbee connected to my laptop to log the GPS data. The serial settings are the same fo… --- ## [Serial over IP, ConnectPort or PortServer](https://forums.digi.com/t/serial-over-ip-connectport-or-portserver/22525)
**Author:** [@pduncan](https://forums.digi.com/u/pduncan)\ **Replies:** 1\ **Last updated:** [July 8, 2021, 8:16pm UTC](https://forums.digi.com/t/serial-over-ip-connectport-or-portserver/22525 "2021-07-08T20:16:50Z")
Hello, We currently use ConnectPort TS16 devices to host 4 serial data inputs to our VM environment, using the Realport protocol. We are researching replacing these devices due to hardware age (5 year refresh cycle) and… --- ## [Serial program to see data from API frames that xbee receive](https://forums.digi.com/t/serial-program-to-see-data-from-api-frames-that-xbee-receive/22435)
**Author:** [@Ignacio\_Mora](https://forums.digi.com/u/Ignacio_Mora)\ **Replies:** 1\ **Last updated:** [June 22, 2021, 7:58am UTC](https://forums.digi.com/t/serial-program-to-see-data-from-api-frames-that-xbee-receive/22435 "2021-06-22T07:58:17Z")
Does anyone know of a serial program or interface in which I can see the data I receive from my Xbee connected to the USB of the computer. I know it exists in XCTU. But I am looking for something more oriented to an int… --- ## [How to connect to XBee via serial terminal?](https://forums.digi.com/t/how-to-connect-to-xbee-via-serial-terminal/21946)
**Author:** [@jtbourke](https://forums.digi.com/u/jtbourke)\ **Replies:** 8\ **Last updated:** [June 2, 2021, 10:21am UTC](https://forums.digi.com/t/how-to-connect-to-xbee-via-serial-terminal/21946 "2021-06-02T10:21:29Z")
I have two XBee modules connected to 2 PCs via usb using the XBee Grove Development boards. I am able to connect with XCTU on both PCs and type messages back and forth. Everything works great. What I’d like to do now i… --- ## [Initial console to DIGI, portserver II/16. what is the cable pinout?](https://forums.digi.com/t/initial-console-to-digi-portserver-ii-16-what-is-the-cable-pinout/16624)
**Author:** [@dfekigjkh](https://forums.digi.com/u/dfekigjkh)\ **Replies:** 13\ **Last updated:** [April 21, 2021, 4:05pm UTC](https://forums.digi.com/t/initial-console-to-digi-portserver-ii-16-what-is-the-cable-pinout/16624 "2021-04-21T16:05:07Z")
I have a home-grown “datacenter” of mixed devices, SUN/AIX/HP/Cisco/Adtran/Juniper, etc. I bought 2 Digi Portserver II 16 so I could reduce the cable clutter. I checked the manuals for console connectivity on initial set… --- ## [XBee3 access TX serial with MicroPython for Simplified Serial use](https://forums.digi.com/t/xbee3-access-tx-serial-with-micropython-for-simplified-serial-use/21428)
**Author:** [@Antoine](https://forums.digi.com/u/Antoine)\ **Replies:** 11\ **Last updated:** [March 30, 2021, 5:56pm UTC](https://forums.digi.com/t/xbee3-access-tx-serial-with-micropython-for-simplified-serial-use/21428 "2021-03-30T17:56:30Z")
Good morning everyone! I have a motor driver that i want to directly control with a simple XBee3 (XB3-24Z8PT-J). Until now I would have use an intermediate cpu like an Arduino, but now we have MicroPython! The motor d… --- ## [RCM6700, Remote firmware update using serial port A](https://forums.digi.com/t/rcm6700-remote-firmware-update-using-serial-port-a/22070)
**Author:** [@Henrik](https://forums.digi.com/u/Henrik)\ **Replies:** 1\ **Last updated:** [December 22, 2020, 1:46pm UTC](https://forums.digi.com/t/rcm6700-remote-firmware-update-using-serial-port-a/22070 "2020-12-22T13:46:08Z")
RCM6700 - I need to use Serial port A for normal use, but I also need to remotely reprogram the firmware using the same connection. The project calls for a single USB connection between the board and the main computer (… [Next page](https://forums.digi.com/tag/serial/51.md?match_all_tags=true&page=1&tags%5B%5D=serial)