===== INDEX =====

  * http://rzr.online.fr/q/ttl# I am sure !RpI #LvTtl 3.3V SeriaL PorT can be used for @fjacob's #NaS #[[Armv5]] #LsProDuo console display BooT LoG


===== TODO =====

FeedBack : 

  * http://forum.hddguru.com/how-unlock-seagate-st3120026a-max-security-mode-nopw-t14545.html#p162872
  * http://forum.ubuntu-fr.org/viewtopic.php?pid=11369321#p11369321# ArmV6

BuY :

  * http://forum.buffalo.nas-central.org/viewtopic.php?f=50&t=5871&p=158567#p158567 #  [[armv5]]
  * http://buffalo.nas-central.org/index.php/Use_a_Nokia_Serial_Cable_on_an_ARM9_Linkstation
  * some capacitors ...
  * or NokiaCa42 : http://dx.com/p/data-cable-compatible-with-nokia-ca-42-446
  * http://www.aliexpress.com/store/product/TTL-to-USB-debug-board/511685_542914515.html



===== SEAGATE =====

See UnLock


===== TTL =====

  * MAX232 : MAX232W  http://www.maxim-ic.com/datasheet/index.mvp/id/1068/t/or#Samples
  * https://viewer.zoho.com/docs/urlview.do?url=http://datasheets.maximintegrated.com/en/ds/MAX3222-MAX3241.pdf

Male @db9 :

     (1) CD  -- 4 6 @db9
  (6)    DSR -- 1 4 @db9
     (2) RxD --------------- 7 @ Max232         RXD=10@Max232 -- 4@hdd = /RXD
  (7)    RST -- 8 @db9
     (3) TxD --------------- 8 @ Max232         TXD=9@Max232  -- 3@hdd = /TXD 
  (8)    CTS -- 7 @db9
     (4) DTR -- 1 6 @db9                                -
  [9]    ? open                                                                
     (5) GnD -------------- 15 @ Max232  +--- hdd1+hdd5+hdd7+hdd2                            
   
                                                     
                                                        @hdd8+16@max232                 hdd6=open
                                                        |
                    HDD                   \ +12v       +5v  /     | (2) (4) [6] (8) |   | IDE       _            |
                                           \  () () () ()  /      | (1) (3) (5) (7) |   |__________| |___________|



  * http://www.youtube.com/watch?v=Ejv-4bn4sVo# The serial interface on the Seagate HD runs only at 3.3V logic level,



==== MAX323 ====

UnSure MAX323 input voltage is 5V but 3.3V  :

  * http://en.wikibooks.org/wiki/Serial_Programming/MAX232_Driver_Receiver
  * https://viewer.zoho.com/docs/urlview.do?url=http://www.tdubel.com/artikkelit/tiedostot/ST310014ACE_unlocking_tutorial_english.pdf
  * http://www.dd-wrt.com/wiki/index.php/LaFonera_Hardware_Serial-Cable-Port# 
  * http://www.hddguru.com/articles/2005.10.01-Seagate-RS-232-adapter-schematic/

ToDo: VerifY those statements :

  "The MAX3232 has the same pin layout as the MAX232, and works at 3.3V." : 

  * http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=70811


  When MAX232 is connected to 5v supply then 
  VIL Low-level input voltage (T1IN, T2IN) 0.8v
  VIH High-level input voltage (T1IN,T2IN) 2v
  
  * http://www.edaboard.com/thread264242.html


===== LvTtl = 3.3V =====

  * http://forum.hardware.fr/hfr/Hardware/HDD/busy-seagate-7200-sujet_836284_1.htm LvTtl
  * http://www.interfacebus.com/voltage_LV_threshold.html# VolT LvTtl
  * http://jeremyblythe.blogspot.fr/2012/07/raspberry-pi-with-textstar-serial-lcd.html
  * http://www.dd-wrt.com/wiki/index.php/LaFonera_Hardware_Serial-Cable-Port

Voltage Divider:

  * (3.3v / 5v) * 50K = 33K + 17K


===== RPI =====

http://forum.buffalo.nas-central.org/viewtopic.php?f=50&t=5871&start=45

  /boot/cmdline.txt
  #console=ttyAMA0,115200 kgdboc=ttyAMA0,115200

  /etc/inittab
  #T0:23:respawn:/sbin/getty -L ttyAMA0 115200 vt100

===== MISC =====

  * http://en.wikipedia.org/wiki/Transistor%E2%80%93transistor_logic
  * https://sites.google.com/site/seagatefix/ h=2.5;5V
  * http://www.raspberrypi.org/phpBB3/viewtopic.php?f=2&t=5219# CMoS
  * http://digital.ni.com/public.nsf/allkb/5AB6172CAE2BEF3E8625629800597B3F
  * http://www.interfacebus.com/Design_Translation.html
  * http://pinouts.ru/CellularPhones-Nokia/# UsB NokiA
  * https://sites.google.com/site/sleclire/ca-42-usb-to-ttl-serial-cable
  * http://www.msfn.org/board/topic/128807-the-solution-for-seagate-720011-hdds/# 
  * http://buffalo.nas-central.org/index.php/Add_a_Serial_port_to_the_LS_DUO# SeriaL RaiD NaS
  * http://worldsat.rtfm.be/faq.php?op=detail&scat=44&pid=85# SeriaL [[RS232]] SaT
  * http://www.adafruit.com/blog/2013/01/28/using-uart-instead-of-usb-adafruit-ultimate-gps-on-the-raspberry-pi-raspberry_pi-raspberrypi/# UarT
  * http://www.instructables.com/id/Using-the-ESP8266-module/# WiFi
  * http://buffalo.nas-central.org/wiki/Building_a_Custom_Serial_Interface# [[ARMv5]] LsProDuo
  * http://fr.aliexpress.com/item/Free-shipping-1pcs-FT232RL-FTDI-USB-3-3V-5-5V-to-TTL-Serial-Adapter-Module-for/32294938771.html?detailNewVersion=2





===== MORE =====

@TaG: SeriaL SeaGate [[RS232]]

{{http://img78.imageshack.us/img78/4004/rs232bn5.jpg}}

{{http://hddremont.narod.ru/2.jpg}}