userdoc:usbtty_serial_login

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision 		Previous revision
userdoc:usbtty_serial_login [2017/04/28 21:57]
abelbeck 		userdoc:usbtty_serial_login [2017/04/29 08:09] (current)
abelbeck
Line 3: Line 3:
 Many **Generic x86 Boards and Appliances** provide a DB9-RS232 serial port for console access, and since modern PC's / Notebooks / Chromebooks do not have a serial port, a USB-to-Serial cable adapter must be used.  You probably already knew that. Many **Generic x86 Boards and Appliances** provide a DB9-RS232 serial port for console access, and since modern PC's / Notebooks / Chromebooks do not have a serial port, a USB-to-Serial cable adapter must be used.  You probably already knew that.
  
-What is new is the ability to connect a second USB-to-Serial cable adapter, back-to-back, to a USB port on your AstLinux box and automatically spawn getty to establish a login.  This is particularly useful for **Generic x86 Boards and Appliances** that only have a VGA video console, or to establish one or more serial logins in addition to a serial console.  The USB TTY serial baudrate and terminal type can be specified independently from the system console configuration.+What is new is the ability to connect a second USB-to-Serial cable adapter (USB-to-Serial <-> Serial-to-USB) to a USB port on your AstLinux box and automatically spawn getty to establish a login.  This is particularly useful for **Generic x86 Boards and Appliances** that only have a VGA video console, or to establish one or more serial logins in addition to a serial console.  The USB TTY serial baudrate and terminal type can be specified independently from the system console configuration.
  
 !!Note: AstLinux 1.2.10 or later is required!! !!Note: AstLinux 1.2.10 or later is required!!
Line 25: Line 25:
 **Equipment:** **Equipment:**
  
-It is recommended to use a USB-to-Serial adapter containing a FTDI chipset, this is supported in AstLinux and is built-in to most modern OS's including Chromebooks.  The older PL2303 Prolific Chipset adapter will also work if you already have one.+It is recommended to use a USB-to-Serial adapter containing a FTDI chipset, which is supported in AstLinux and is built-in to most modern OS's including Chromebooks.  The older PL2303 Prolific Chipset adapter will also work if you already have one.
  
-To be clear, the back-to-back USB-to-Serial adapters do not have to use the same chipset or brand, as long as internal driver support exists for the USB end.+The two USB-to-Serial adapters are connected together with a DB9 [[wp>Null_modem|Null Modem]] cable or mini adapter.  A crossover connection, **not** straight through. 
 + 
 +To be clear, the back-to-back USB-to-Serial adapters do not have to use the same chipset or brand, as long as internal driver support exists for each USB end, respectively.
  
 **Operation:** **Operation:**
 +
 +Join the two USB-to-Serial adapters together using a DB9 Null Modem cable or adapter.
  
 Plug one USB connector into your PC / Notebook / Chromebook, start a terminal emulator (screen, minicom, etc.) at 115200 baud (unless changed). Plug one USB connector into your PC / Notebook / Chromebook, start a terminal emulator (screen, minicom, etc.) at 115200 baud (unless changed).
  • userdoc/usbtty_serial_login.1493434664.txt.gz
  • Last modified: 2017/04/28 21:57
  • by abelbeck