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--- userdoc:usbtty_serial_login [2017/04/28 18:13]
abelbeck
+++ userdoc:usbtty_serial_login [2017/04/29 08:09] (current)
abelbeck
@@ Line 1: / Line 1: @@
 ====== USB TTY Serial Login ======
-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!!
@@ Line 25: / Line 25: @@
 **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 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 be same chipset or brand, as long as internal driver support exists at 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:**
+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).
+!!Tip ->!! ''screen /dev/ttyUSB0 115200''
+!!Tip ->!! ''minicom -D /dev/ttyUSB0 -b 115200''
+Plug the other USB connector into your AstLinux box.
+You should immediately see a login prompt on your terminal emulator screen.
 **Photos:**