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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.

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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 ...
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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 ...
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Connecting an APC RackPDU directly to a Lantronix terminal server

I have an APC Rack PDU (AP7920) and a Lantronix ETS16P RS232 terminal server. I would like to connect the RackPDU directly to the Lantronix. The RackPDU has a serial RJ12 connector and the Lantronix a ...
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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 ...
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Alpine Linux AArch64 on Oracle Cloud Serial Issue

I am trying to install Alpine Linux on Oracle Cloud AArch64 VM. I had already installed bootloader (Grub, arm64-efi), kernel (5.10.75) and userspace on it. In order to debug boot issues, I setup the ...
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Amazon Web Services To Serial Device

I'm contemplating moving an old windows server we have to AWS when the unit finally retires. One issue is that we have a truck scale that connects to the server via a serial (com3:) port. The current ...
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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 - ...
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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 ...
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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. ...
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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-...
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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, ...
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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, ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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....
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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 ...
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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 ...
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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 ...
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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 ...
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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: ...
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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 ...
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4 votes
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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)" ...
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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/...
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1 vote
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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 ...
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2 votes
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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 ...
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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 ...
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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 ...
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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 (...
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3 votes
2 answers
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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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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'...
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5 votes
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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 ...
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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 ...
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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 ...
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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]....
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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 ...
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8 votes
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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How can I connect to a cisco switch via serial console cable from powershell?

I don't actually need to perform any operations on the switch. I just need to verify it's there. I have some remote servers that I need to verify have the blue serial console cable hooked up ...
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APC Smart UPS serial connection on Windows Server 2012 R2

I have an APC UPS 620 and a Windows Server 2012 R2 (non virtual) server. The server and the UPS are connected with genuine APC serial signaling cable. Without installing any software the APC is not ...
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How to connect a switch and a router to laptop via putty

I am new to configure a switch 2950 and a router 2651 to laptop using putty on my home lab. My problem is that after I connected my router through console cable to laptop I and decided to add a switch ...
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