Active2 years ago
I have a server to which I would like to have a console connection. Normally this would be done using RS232 port, or using USB to RS232 converter.
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But to me it seems like it must be possible to connect the two USB ports directly, given that one of the ports can be made to act like a device. If the port is an OTG (On-the-go), this should be possible as far as I understand.
Inside the big USB plug is a USBSerial conversion chip and at the end of the 36' cable are four wire - red power, black ground, white RX into USB port, and green TX out of the USB port. The power pin provides the 5V @ 500mA direct from the USB port and the RX/TX pins are 3.3V level for interfacing with the most common 3.3V logic level chipsets. USB console cable (shipped with the product) or a null-modem cable (not shipped with the product) with 9-pin connectors on each end. Select a console port using the console switch on the rear panel: Select the mini USB port on the rear panel (cable included) as the console port by pushing the slide switch to the left.
So my question is, given the above, would it be possible to directly connect two computers, using a single USB cable, for console access?
MatsMats
![Linux Serial Console Via Usb Cable Linux Serial Console Via Usb Cable](/uploads/1/2/4/7/124784146/944470804.jpg)
1 Answer
The link-level protocol of the USB is a very different one as the RS232. It uses 2 data wires, it is packet-based, it is master-slave and it can connect many nodes on a single wire (RS232 is bidirectional). The abbreviation of 'universal serial bus' is a little bit misleading: it is designed to be so universal as the RS232 was, but it is not a stream protocol.
To have a direct stream connection between two machines, some type of data stream should exist over the link-level USB protocol.
The result is that in essence you have an usb-to-serial converter, which acts as an intermediary layer between the USB and a bidirectional data stream. It shouldn't be rs232, and also it shouldn't do a physical conversion.
- Installation of Arch Linux is possible via the serial console as well. A basic environment for this scenario is two machines connected using a serial cable (9-pin connector cable). The administering machine can be any Unix/Linux or Windows machine with a terminal emulator program (PuTTY or Minicom, for example).
- How to connect USB Serial Console Cable to Linux. 时间 2014-07-29. T he following guide will walk you through on setting up USB Serial Console Cable on a Linux via command line. First of all, make sure you have a program called Minicom installed.
You can buy a simple usb link cable to interconnect two machines. As two usb slaves can't be connected directly, they also need some intermediary usb master. This works mostly by giving an usb-ethernet interface to the machines connected with them, but giving an usb-serial interface would be possible too, and these devices may exist.
![Console Console](https://s3-ap-southeast-1.amazonaws.com/a2.datacaciques.com/17/06/23/3i73ir962f92l1v1/9b404a8fb388b867.jpg)
Next to the RS232, the Apple has developed a hardware-extended solution named lightning for that, although I would suggest more the RS232 direction on practical reasons.
However, there is a much smaller diversity in the machines bioses of most PC architectures. If you want a console redirection with them, you have only a physical RS232 connector on the mainboard for the task. Most BIOSes/EFIs won't even use an usb-to-rs232 connector, only the physical rs232 port on the motherboard.
peterhpeterhLinux Serial Console Via Usb Cable Box
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