The serial interface or serial port, also known as RS-232 is a communication port used to connect modems, mouses, some printers, scanners and other hardware equipment.

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Why do serial ports send data least significant bit first?

On Wikipedia, it says the following about serial ports: Most serial communications designs send the data bits within each byte LSB (Least significant bit) first. What is the reason why most ...
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Is there a button that connects through Serial/RS232? [on hold]

I've been searching the web for a button that connects via RS-232 (single button, similar to what you would see on an Arcade game). I know I could take a crack at making one but I am more interested ...
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What is the Communications Port (COM1) in Windows 7?

I recently bought an (old) laptop from someone, and despite having installed virtually no programs on it the Device Manager lists a Communications Port assigned to COM1. Attempting to use COM1 for ...
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38 views

SSH and XON/XOFF software flow control

I am using a vintage serial terminal connected to a linux box via a USB to RS232 serial null modem cable. The terminal uses XON/XOFF flow control to avoid overflowing the buffer. The terminal works ...
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15 views

Make stty setting permanent

I tried to setup raw serial communication over ttyusb0 and used stty to change baud rate and raw mode. Those settings were successful and it was visible after I checked ttyUSB0 again, so after stty -...
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16 views

USB to Serial cable fails to establish communication on Ubuntu

I have a serial device which works fine when connected directly to the serial port of the linux box but fails when I connect it using a serial-to-usb cable - that is using the USB port on the linux ...
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52 views

How to remove FTDI's cached registry entries in Windows 7

I have an FTDI USB-to-comm-port device. I've noticed if I have to reprogram the device using FTProg that it doesn't properly reinstall the COM port driver/settings, if the device serial number stays ...
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36 views

How to automate putty commands when connection is through serial port?

Two files are there. I want to run trial .txt cmd in serial port connectivity with a hardware.pls suggest how to automate this. I will use these cmds repetititvely. Batch file cmds below sv.batch ...
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modem didn't respond to AT commends

I want to perform some AT commends on my huawei ec122 modem (locked) but i didn't receive any response from it. i am using c# to perform request with waterline method the port open without problem and ...
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37 views

Serial connection crossover

When accessing a serial connection I only get random numbers and characters: http://i.imgur.com/NsGIamE.png The manual for the piece of hardware I am trying to access says following about the ...
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40 views

FTDI driver installed but COM port is not appearing (Windows 7, 64bit)

I'm firmware engineer and using the FTDI chips a lot. Everything works great. But today, with one device I have a problem. In my colleague PC, the COM port of the device appears, but in other PCs in ...
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26 views

Advance a Bluetooth device from paired to connected Win10

A bluetooth medical device is paired (indicated in screenshot) with a Win10 laptop and the two communicate via SPP (serial port protocol). What user actions can be taken to prompt the connections so ...
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how to get the count of available Physical serial port

How we get the count of total number of physically available serial ports in a Linux machine. Is there any particular command for that?
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How to set up usage of a serial port?

I am working on Linux (TinyCore). As a part of work process, i must use a serial device to transmit data. However, i am having severe troubles with it. The crux of the issue is that no data seem to ...
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65 views

COM port RS485 sniffer using 9bit datawords

I have to monitor COM port, particularly log all raw data from it in a file. I don't have official technical specification of device, which communicates by this port, but as I found in some forum, "It ...
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87 views

Serial over USB 2.0. Is it really faster than standard serial? [closed]

A member of our scientific collaboration designed a data acquisition box with with 4 channels @ 1 kHz that synchronizes time with GPS. He uses USB 2.0 to have the box communicate with a computer, and ...
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50 views

Access bluetooth RFCOMM through android terminal

I would like to access to RFCOMM to set up a bluetooth virtual serial port on my Android device using the terminal. I do have root permissions on my android device. When I type "rfcomm" in the ...
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1answer
233 views

Serial console login on OSX

Background I've got a Wyse WY-50 terminal here that, for various nolstagia and productivity reasons (really!), I'd like to connect to my Macbook and use as a login terminal. I'm using OSX 10.10 El ...
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65 views

How to create a serial pipe between a windows host and virtual machine in VirtualBox?

I am trying to debug the kernel of a windows 7 virtual machine and am following the steps here, here and here. I ran: bcdedit /debug on bcdedit /dbgsettings serial debugport:n baudrate:115200 on ...
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39 views

Do Until in Powershell

I'm connecting via serial port with powershell to a device and I'm trying to change one value until another value gets to 0. I'm using Do-Until but it just runs endlessly with the first value being ...
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How to share a serial port between a gdbserver and a system console

I am trying to debug userland applications on an ARM-based embedded system running a Linux/Busybox software stack. GDB runs on a host (Debian) PC and the target has a gdbserver. I'd like to use one ...
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VMWare WS 12 - connecting to guest OS via serial port

I installed a virtual image of an appliance. The HW version of the appliance has a serial port for initial configuration, and I'm trying to do the same with the virtual. Following https://www.vmware....
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102 views

Printing over USB in FreeDOS 1.1

I was hired by a small business to upgrade their computer system and have run into a very complex issue that no one else on the internet has battled quite like I have. I'm at my wits end. If any of ...
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218 views

Sending commands via serial connection

I've got a Sartorius GD-503 electronic lab scale that I'm trying to work into a control setup. I've got both the regular manual and the data interface description manual. So far I've got my laptop ...
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26 views

CDC Virtual Serial Port

I would like to know what a CDC Virtual Serial Port for Windows and Linux is. I have an idea of some of the components (like a virtual serial port), but I don't understand some of the pieces (like ...
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Serial port interference on Linux?

I am attempting to communicate with a MODBUS device over serial port. On my Windows machine this works, and the modpoll software can talk to the device just fine. However, on a fresh Arch Linux ...
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Is serial port a 'male' or 'female'?

Usually, the "ports" on the computer are female but this one in specific appears to be a male port. I have never seen one and google images are also causing a confusion from seeing this: If that's ...
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124 views

How to run a virtual machine with no graphics card (VGA) configured in VirtualBox

I want to use the following feature of Linux (which one of my virtual machines): If no console device is specified, the first device found capable of acting as a system console will be used. At ...
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156 views

RS232 switching matrix for multiple devices and PCs? [closed]

I have six pieces of equipment which con be controlled via RS232. I want to be able to select which pieces of equipment are connected to any one of my three computers at a given time. I know that I ...
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217 views

I am unable to connect to an HP Procurve Switch with a patch cable

I'm trying to connect to an HP Procurve switch 2610-48 PWR using Putty, an HP elite Probook laptop and a patch cable. When I connect to the console port using the appropriate cable, the command window ...
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70 views

How to host modern console application on legacy serial COM device in Windows

EDIT: Changed primary example from Zork Dungeon to the default OS shell. I have a console application running on a modern machine. I also have an Apple //e with a Super Serial Card, which allows it ...
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50 views

Change serial connection speed in ExtraPuTTY automatically

I really need help.. I'm using ExtraPuTTY to open a terminal on some serial port on my PC. At the beginning of the session I want to transfer a file over Putty XMODEM feature to the end-point at 3Mb/s ...
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348 views

Receiving data from Serial Port

I want to receive data from RS232 Serial port to my terminal and with a directive to a file. It should be pretty straight forward. cat /dev/ttyS0 cat /dev/ttyS0 > file.txt Before that I've ...
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Barcode scanner USB to serial

I have a problem with a barcode scanner. It came with a USB Cable but in the manual it says that it can do RS232 communication. The modes it can operate are: Keyboard Wedge, which works fine but I ...
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129 views

Can't communicate with serial scales

I have a set of serial scales. They communicate at 2400 E 7 2. I have used these scales on many other devices so I know they work. They put out a constant stream of data. The O/S is 64 bit Windows 8.1 ...
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26 views

How to select grub entry via PS2 port?

We want to output the grub entry to serial port and select the grub entry on another machine via serial port. We have two machines. For the machine with built-in serial port, we followed the ...
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143 views

Can I read a serial console over USB (not with an adapter)?

I'm working with a device that provides serial console access via a USB-B port. My workstation is a laptop running Linux Mint 17.1. Previously, I was able to access the serial console from my laptop ...
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181 views

Converting serial port binary hex to serial port ASCII decimal

I'd like to convert a binary hexadecimal data string on one serial port to an ASCII decimal string output to another serial port. Is there already an application that does this? If not, would it be ...
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File transfer over a serial port using Windows 8

I am looking for a way to transfer a file over from my Windows 8 computer to a Pandaboard (has OMAP ubuntu on it) using a serial cable. The solution should work in general for any ARM board, so for ...
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1answer
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Why is USB Serial so fast in linux?

I've just started using a 3G modem on a RaspberryPi using the "stock" USB Serial driver from the linux kernel (as indicated in the modem documentation). Once the modem was recognized and appeared as a ...
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1answer
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Xyplex MaxServer 20 Terminal Server

I recently purchased a Xyplex (which was purchased by MRV) MaxServer 1620 terminal server for my CCNA lab so I could manage all of the console connections from a single device.. Well, that was the ...
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How do I dump every byte written to a tty?

When connecting to a switch over serial (/dev/ttyUSB0) using PuTTY, I'm presented with a login prompt. If I connect using the Python pyserial library and write a few line breaks (\n\n\n) I'm not ...
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Where can I find a serial port cloner for Debian Linux

I have two application that need to share the same serial port, one is for monitoring and the other will actually respond back to what will happen through the physical port. I tried to make use of ...
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179 views

How can I allow two applications access to the same serial port

I need two application to run on the same serial port (/dev/ttyUSB0). One is a read-only monitor, while the other is an application that will read the data on the serial port and respond back. How ...
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Serial Port output history?

Is there a way I can go back and view previous serial sessions I have had? I use cu on ubuntu to open the serial connection. I need to see if I can find a traceback on my cisco router. thanks
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241 views

How to set up usb-to-serial port on QNX?

How to set up usb-to-serial device in QNX operating system to use it in code like open("/dev/serusb1")? I'm using VMWare to host QNX. How to check if USB adapter is properly connected?
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Define a USB Device Port on Mac OSX 10.10

I am using a 3D printer app that is not the driver that came with the printer. The advantage of this app is it can utilize a reloaded filament cartridge and ignores the state of the chip. However, it ...
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How do I Introduce Latency to a Serial Port

I am looking for a way to introduce latency to a serial port. I am using a radio through a USB port and am looking to purposely delay the transmission by some amount of time (hopefully in an easily ...
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309 views

How do I configure Putty to show non-printing Ascii Characters when using a Serial Connection

I am trying to debug communication with a hardware device via serial port. The hardware device will occasionally send out information that is not a alphanumeric or whitespace character. While my ...
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28 views

Serial Connection Issues

I have a Radionics rfid badge reader on my desk which is supposed to interface with our badge software (Stanley PAC) which is installed on my computer. I am using a docking station (also HP) which ...