Questions tagged [serial]

The general purpose communication interface and related protocols. Specifically, a serial interface transfers one bit at a time ("in serial"), and complies with the RS-232 standard.

Filter by
Sorted by
Tagged with
1 vote
0 answers
69 views

Linux Driver CH341 USB Adapter Serial Port issue

On a x86_64 miniPC, a led strip can be controlled sending some bytes on a serial port. This control works on Windows but fails on Linux. On Windows, these lines in PowerShell switch the led strip off: ...
Sylva1n's user avatar
  • 23
0 votes
0 answers
44 views

xhci_hcd errors on CentOS 6 for cp210x device

We have very old CentOS 6 installed on CheckWay Sherman with Linux kernel 2.6.32-696.1.1.el6.i686. We try to integrate external usbserial scales device but there are errors settings UART speed. stty -...
Olga Pshenichnikova's user avatar
0 votes
0 answers
150 views

How to read elm327 obd2 raw data over bt using rfcomm?

I am trying to read my car data, i have hooked a cheap elm327 bt obd2 connector to it, and using lubuntu. Basically this is what i have done, but its not fully working i end up with a sort of buggy ...
sgt's user avatar
  • 101
-1 votes
2 answers
201 views

USB Proxy "Dongle"

I need to be able to record all print requests to a printer physically connected via USB to a PoS like system. There is no need for me to manipulate the print job, I just need a "copy" of ...
Stefan's user avatar
  • 117
0 votes
0 answers
68 views

Piping data from ethernet to serial and back to ethernet doesn't reach destination

CONCEPT VISUALIZED I'm trying to establish a bidirectional communication where ethernet UDP packets enter a linux system (suppose a Raspberry pi) from eth0 interface and piped into the UART hardware ...
zanglorion's user avatar
0 votes
1 answer
493 views

How are Serial Communications designed to be connected virtually on Dell PowerEdge 12th generation servers?

Im trying to figure out what exactly can be configured by the first three settings on Dell PowerEdge R720 Server BIOS's Serial Communications Screen. Let me explain what (I think) I have understood: ...
ElectricDevDucK's user avatar
0 votes
1 answer
627 views

replace APC smart signaling cable with RJ-45 to RJ-45

Is it possible to replace the APC Smart Signaling Cable PN: 940-1525A with an RJ-45 to RJ-45 cable? The cable is built as an RJ-50 to DB9, but I need to connect it to a console server that only uses ...
mcv110's user avatar
  • 1
0 votes
1 answer
332 views

Can Serial I/O from a server be shared on an ethernet network switch?

I have a network switch, a Linux server, and my computer. The computer and server are both connected to the switch. If I connect the serial port of the server to the switch through a Serial to ...
tymur999's user avatar
  • 515
2 votes
0 answers
389 views

Why do screen and minicom drop incoming bytes from a serial port while cat does not?

I recently needed to reset the password on an old APC UPS which requires connecting their proprietary serial cable, hitting the reset button, and logging in with the default username and password over ...
Kayson's user avatar
  • 301
1 vote
1 answer
2k views

SSH over serial on Windows

I need to establish SSH connection over serial between Windows and Linux machine. I used socat on Linux side to do forwarding from uart to SSH server at localhost and it works fine. Goal: SSH client - ...
serenity's user avatar
0 votes
0 answers
370 views

UDP to Serial port

I look for some solution for connect serial/UART port by UDP connection to another PC. Now I use socat and have connection , but with lost packages, and slow transfer. Can I use netcat for this, maybe ...
Vitaly Rom's user avatar
4 votes
3 answers
1k views

Turning an IBM lto6 sas HH drive from library to standalone, how?

new here. I have been using a stand alone lto6 hh drive (ibm ts2260/3580 h6s) for two years. Just recently I bumped into an almost new ibm ts2900 autoloader with an hh lto6 drive in it and bought it. ...
satantango's user avatar
0 votes
1 answer
656 views

Having startup messages on virtual tty (monitor) AND serial console

I have enabled serial console over null-modem cable in Debian 10 like this: /etc/default/grub: GRUB_CMDLINE_LINUX="console=ttyS0,115200n8" GRUB_TERMINAL=console then systemctl enable serial-...
LetMeSOThat4U's user avatar
0 votes
2 answers
6k views

initial cisco nexus setup without serial cable

I've never used a cisco switch. On the used 3048t i just got, there's a dedicated management ethernet port on the back, so i was blindly assuming it would just accept a dhcp address and give me ssh, ...
aep's user avatar
  • 187
1 vote
0 answers
92 views

Ubuntu Serial Console Installer Encoding Issue

I'm trying to install Ubuntu 18.04 LTS via serial console. My PXE boot menu works fine, the initial load of the kernel into the ramdisk is legible, but as soon as the Ubuntu installer menu appears, ...
Gavin Hill's user avatar
1 vote
0 answers
63 views

Can a tablet device be used as a console to monitor the boot process of a CentOS/RedHat server?

Can a tablet device (e.g., Fire HD 8 tablet) be used as a console, to monitor the boot process of a CentOS/RedHat server? For instance, is it possible to connect a BlueTooth adapter to the tablet's ...
boardrider's user avatar
0 votes
1 answer
606 views

Configuring NUT for old serial connected UPS (Tripp-Lite)

I have an old Tripp-Lite UPS (SU2200RTXL2UA) which I need to communicate with via it's RS232 Port (this model doesn't have a USB port). I'm trying to figure out which Serial NUT driver would be most ...
Jason O's user avatar
  • 159
1 vote
1 answer
1k views

Can you start a getty on /dev/pts/x ? Want a serial connection between my Linux KVM server host and Windows Guest

Here's what I have going on: I have a Debian server running several services in Docker and a couple in KVM. One of the KVM hosts is a Windows 10 VM that I actually use as a desktop by using PCI ...
Lon Kaut's user avatar
  • 151
0 votes
1 answer
107 views

TTL/UART communication issue

I have (an awesome) Onion Omega2+ SBC and an A9G GPS/GSM module. The module has two UART ports. I can easily read data from the UART_GPS but for some reason I cannot communicate with the UART port for ...
Radek Suski's user avatar
0 votes
2 answers
3k views

NetworkManager gsm connection on Simcom SIM5320A via serial port is failing

Device Hardware: Raspberry Pi 3 OS: Raspbian GNU/Linux 10 (buster) NetworkManager: 1.14.6 ModemManager: 1.10.0 Modem: Simcom SIM5320A connected via UART to the port ttyAMA0 Problem I don't think ...
Dien's user avatar
  • 9
1 vote
1 answer
227 views

Does anyone know connection points for Speakercraft DB9 to 3.5mm adapter cable?

I am looking for Speaker craft 3.5mm (4conductor) to DB9 serial cable to program MZC 64 through EZ tools. I am unable to find it online. Does anyone have the cable or know the contact points from 3....
HPal's user avatar
  • 11
1 vote
0 answers
412 views

Connect over serial from Perle Iolan

I have a Perle Iolan connected to a server over serial. Cat < /dev/ttyS0 and echo "show hardware" >/dev/ttyS0 from the server I'm connecting to works as well as running serial 1 -show on the Iolan ...
degart's user avatar
  • 11
0 votes
0 answers
44 views

Mapping a remote serial port to a Debian VM

I have a Debian Stretch VM that is dynamically migrated between a few hosts. I need to connect a serial (RS-232) modem to it. Unfortunately, I cannot use the hypervisor for this. I am looking for a ...
Jakub's user avatar
  • 266
0 votes
1 answer
4k views

How to access Arista switch login?

I have an Arista 7048T-A switch that needs to be set up. However I can't seem to access the login prompt for the switch. I'm using PuTTY over serial connection. What i mean by not being able to access ...
ItzJustJosh's user avatar
1 vote
0 answers
2k views

COM port redirect wont show up on Windows Server 2012 R2

I can't get serial COM port devices to show up on Windows Server 2012 R2 via RDP. I am having no issue with redirected printers, but when it comes to serial COM devices, they just wont show up. I ...
jLynx's user avatar
  • 133
4 votes
2 answers
8k views

Can't get a serial console on MikroTik RB4011iGS+

I am trying to connect to the serial console of my MikroTik RB4011iGS+. I might be missing something obvious, but I can't seem to get a terminal (or anything else). Relevant documentation page: ...
Valmiky Arquissandas's user avatar
0 votes
1 answer
3k views

How to Reset a Dell EqualLogic PS6100 Without Password or Serial Access

I have before me a Dell EqualLogic PS6100 with two Type 11 (green) controllers. I have been tasked with refurbishing the unit ready for resale for an IT waste recycling firm. My boss is one of those ...
NEKOCHI TECH's user avatar
4 votes
2 answers
1k views

Can't get grub2 boot menu via COM2 port

I want to connect my "CentOS Linux release 7.6.1810 (Core)" device via COM2 port,then I modify '/etc/default/grub': GRUB_TIMEOUT=5 GRUB_DISTRIBUTOR="$(sed 's, release .*$,,g' /etc/system-release)" ...
mrco's user avatar
  • 189
1 vote
1 answer
379 views

T0 vs S0 in inittab for serial ttyS0 access

I can't find any documentation on what the difference between "S0" and "T0" in the inittab file for granting serial access to console is. People seem to use it interchangeably: T0:12345:respawn:/sbin/...
xiconfjs's user avatar
1 vote
1 answer
237 views

Serial over USB during boot

I am currently trying to debug the boot sequence of Xen, and past a certain point, the only way to do it is over a serial connection. Now, on the laptop I'm using there exists no serial port nor an ...
Quantomic's user avatar
2 votes
0 answers
861 views

Serial terminal servers that work with "serial-over-USB"

I've used serial terminal servers for a long time. Basically, these are devices that allow you to communicate with a serial (eg RS232/RS485/RS422) device over ethernet in various ways. Folks in this ...
Angelo's user avatar
  • 121
2 votes
1 answer
5k views

PPP / 3G modem not getting an IP: No network protocols running

Modem in use: SIM5310 connected to an ARM based board. root@cm-debian:~# uname -a Linux cm-debian 4.4.0-cm-t335-5.1-00030-gd350d89-dirty #29 SMP Sat Nov 4 19:18:48 PDT 2017 armv7l GNU/Linux I am ...
Smokie's user avatar
  • 121
-2 votes
1 answer
2k views

Telnet through a serial terminal server

I have a Perle IOLAN device like this, and one configuration option is for a serial terminal. The corresponding configuration screen. As you can see, one option is to configure the terminal to ...
tavr's user avatar
  • 1
2 votes
2 answers
6k views

how to use ssh over serial without using pppd? ( Or how to transfer TCP over serial without using pppd)

There are many virtual machine based on QEMU in my server. Some of them are forbbiden to use networking, and only way to attach them is via virtual serial port. Due to serial console's bad features (...
Komeiji Kuroko's user avatar
3 votes
2 answers
4k views

HP Procurve 2650 has password set after factory reset

I have a problem with HP ProCurve 2650 switch. I don't have a password to it so I did a factory reset (pressing reset and clear buttons for 10 seconds). The problem is it still asks for the password. ...
XorOrNor's user avatar
  • 241
-2 votes
2 answers
263 views

Connect Raspberry Pi to Windows Server (HP DL380) over serial connection

I have tried searching the internet for many hours on this issue and I haven't found anything that would fit my needs. Here is the problem: We have some HP DL380 servers in a network that is closed ...
cGpE's user avatar
  • 1
2 votes
1 answer
588 views

Linux: logoff the user after its serial console terminated

I connected to Linux (in the case here, I used Ubuntu 1604) by serial console. Now, the serial console is closed (terminated), but, when I connect back to the serial port again I saw all the sessions ...
Howard Shane's user avatar
0 votes
0 answers
4k views

Serial port console connection to Network Switch

I have a network switch (an HP Procurve) that provides a command line interface that can be accessed via a direct serial port connection. The direct connection is done using an RJ45 connector on the ...
Siler's user avatar
  • 379
0 votes
2 answers
220 views

RS232 to USB extension cable to network configuration

I'm not sure this is the correct place for this question. I have a console cable to configure network devices like switches (https://images-na.ssl-images-amazon.com/images/I/41LDstMTA5L.jpg) So, I ...
Juan Botero's user avatar
0 votes
0 answers
523 views

Avocent Cyclades Serial Switch Disable Telnet Login message

Whenever I open a telnet connection via PuTTy to a serial port on my Avocent switch, it will print something like the following message: Sharing connection with other user(s): 'NONE@525', 'NONE@546'...
Scott Glenn's user avatar
10 votes
1 answer
38k views

QEMU and serial ports on the guest OS

Has anyone successfully managed to run a Guest OS in QEMU/KVM where the guest has full access to the Hosts serial port(s), be it /dev/ttyS0, COM1, or a virtual serial port provided by the Host. It ...
joho's user avatar
  • 103
1 vote
0 answers
2k views

Can't send commands to server via Serial connection in putty/termite

I acquired a Sunfire v215 server from work (they were recycling it) to fiddle around with in my spare time. I'm trying to start it up - the installation guide says you need to use a serial terminal or ...
SaveToTheADrive's user avatar
0 votes
1 answer
157 views

Setting up a three way serial port from a single existing port

I currently have a device that has a serial port, and on boot this serial port is bound to ttyS1. There is a process on the device (that I have little control over) that takes control of this port so ...
Tyler's user avatar
  • 111
1 vote
1 answer
205 views

Unable to attach additional serial ports to a RHEL6 server with 8 serial ports

I have a RHEL6.9 server with 8 serial ports attached. RHEL has configured 4 of them /dev/ttyS0-3, they have addresses and IRQ's. I've been using the mknod command to create the devices /dev/ttyS[0-3]....
Jim's user avatar
  • 53
1 vote
2 answers
5k views

How to tunnel the serial port from a remote machine?

I'm trying to access a remote serial console (a tty port on a remote machine) as if it's on a local machine. This is necessary for a serial-port only application to work on my machine. The remote tty ...
crististm's user avatar
  • 141
8 votes
3 answers
26k views

How to enable and use the serial terminal of a HP Microserver Gen9?

I have a HP ProLiant Microserver Gen9. It has HP ILO version 4, but the Java based Remote Console doesn't work reliably and I can't use it after the POST screen in the free version of ILO (asks me to ...
nh2's user avatar
  • 908
0 votes
1 answer
294 views

Remotely connect to Hyper-V guest before OS boot?

I have several guest VMs that use Truecrypt full disk encryption running on a Hyper-V host. What are my options to allow VM owners to enter their own password to boot the machine?
Sergei's user avatar
  • 103
10 votes
3 answers
6k views

Connect to switch's console port through ethernet patch panel

In our office building, we have a Cisco SRW2048 switch. On the back, it has a serial port for console connections. I would like to connect this console port to my computer in my room. The switch is ...
gen_Eric's user avatar
  • 211
0 votes
1 answer
821 views

Cut Off My Own Google Cloud Engine SSH Nose

A bit of stupidity. On my Google Compute Engine (GCE) instance, I went in and changed the sshd_config to listen another port (something I do routinely)...but I didn't test before logging off. And ...
codenoob's user avatar
  • 103
0 votes
1 answer
84 views

Are the tty parameters stored somewhere when using screen?

Here is the story: From a fresh install of ubuntu I use a serial to usb device. screen /dev/ttyUSB0 everything goes fine and I can interact with the device perfectly. Then I unplug this device, plug ...
user1707414's user avatar

1
2 3 4 5