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hardware:serial 2011/04/16 09:05 hardware:serial 2017/09/06 18:38 current
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**WARNING: attaching a serial port will certainly void your warranty and could destroy your unit.** **WARNING: attaching a serial port will certainly void your warranty and could destroy your unit.**
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===== Serial Connector Basics ===== ===== Serial Connector Basics =====
  * The serial connector is at **CON4**, a white connector inbetween the two drive leds.   * The serial connector is at **CON4**, a white connector inbetween the two drive leds.
  * This is a 3.3V TTL serial port, common on many hardware devices.   * This is a 3.3V TTL serial port, common on many hardware devices.
-  * You **CAN NOT** connect it directly to a PC serial port, you will need a level shifter, a popular (and simple) chip for this is the **MAX323**+  * You **CAN NOT** connect it directly to a PC serial port, you will need a level shifter, a popular (and simple) chip for this is the **MAX232**
  * **Warning:** Do not use 5v signals - you might damage the CPU   * **Warning:** Do not use 5v signals - you might damage the CPU
  * TX is the outgoing 3.3 volt CMOS signal FROM the Marvell 88F5181 ARM CPU   * TX is the outgoing 3.3 volt CMOS signal FROM the Marvell 88F5181 ARM CPU
  * RX is the ingoing signal TO the CPU.   * RX is the ingoing signal TO the CPU.
  * Baud rate is 115200 baud - 8 bits, no parity and no flow control   * Baud rate is 115200 baud - 8 bits, no parity and no flow control
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==== Pinout on the NAS ==== ==== Pinout on the NAS ====
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^Pin 1^Pin 2^Pin 3^Pin 4^ ^Pin 1^Pin 2^Pin 3^Pin 4^
-|3.3V|RX|TX|GND|\\+|3.3V|RX|TX|GND
 +| |Tx of the Soc|Rx of the Soc| |\\
-[[http://picasaweb.google.com/100894775614123215686/DNS323#5596044900892645362|DNS323 Rev B Board w/Pin 1 Marked]]+  * [[http://picasaweb.google.com/100894775614123215686/DNS323#5596044900892645362|DNS323 Rev B Board w/Pin 1 Marked]]
__**It doesn't matter what adapter you choose below so long as you match up the PINs / Wires to the table above.**__ __**It doesn't matter what adapter you choose below so long as you match up the PINs / Wires to the table above.**__
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 +__**In general you only need to connect Pins: 2, 3, and 4**__
===== Serial Connectors ===== ===== Serial Connectors =====
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If you do not have a serial port on your computer, FTDI sell a convenient USB cable that contains a serial chip and level converter in one, and has bare wires at the other end. The cable has drivers for all major operating systems, I am running it under linux with no problems. The datasheet is [[http://www.ftdichip.com/Documents/DataSheets/Modules/DS_TTL232R3V3.pdf|here]]. This is what i used: If you do not have a serial port on your computer, FTDI sell a convenient USB cable that contains a serial chip and level converter in one, and has bare wires at the other end. The cable has drivers for all major operating systems, I am running it under linux with no problems. The datasheet is [[http://www.ftdichip.com/Documents/DataSheets/Modules/DS_TTL232R3V3.pdf|here]]. This is what i used:
-  * DigiKey 768-1016-ND USB cable and logic converter (TTL232R3V3) +  * [[http://www.digikey.ca/product-detail/en/TTL-232R-3V3/768-1015-ND/1836393|DigiKey 768-1015-ND USB cable and logic converter (TTL232R3V3)]] 
-  * Digikey WM1722-ND female housing (Molex 51021-0400) and WM1775-ND pins (Molex 50058-8000)+  * [[http://www.digikey.ca/product-search/en?vendor=0&keywords=WM1722-ND|Digikey WM1722-ND female housing (Molex 51021-0400)]] and [[http://www.digikey.ca/product-detail/en/0500588000/WM1775CT-ND/242897|WM1775-ND pins (Molex 50058-8000)]] 
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 +Instead of buying the Molex Housing and Pins separate, you can __purchase a pre-assembled Molex Housing/Pins__ and save yourself the trouble of soldering/fitting the pins. [[https://picasaweb.google.com/100894775614123215686/DNS323#5596065303294291378|Example]] - [[http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=220743624686|Buy From eBay]]
Just solder the wires to the connector in this order: Just solder the wires to the connector in this order:
^Pin 1^Pin 2^Pin 3^Pin 4^ ^Pin 1^Pin 2^Pin 3^Pin 4^
-|Red|Yellow|Orange|Black|\\+|Red|Yellow|Orange|Black|
When using the USB to Serial adapter with the DNS-323, you may have to disconnect the red (power) lead from the connector. On the Rev. A1 of the board, once the USB connector is plugged into a computer, it may power up the DNS-323 mainboard and start the boot process without the powerbutton being pushed. Once the red lead was disconnected, the DNS-323 wouldn't start until the power button was pushed, thereby allowing the complete boot sequence to be viewed. When using the USB to Serial adapter with the DNS-323, you may have to disconnect the red (power) lead from the connector. On the Rev. A1 of the board, once the USB connector is plugged into a computer, it may power up the DNS-323 mainboard and start the boot process without the powerbutton being pushed. Once the red lead was disconnected, the DNS-323 wouldn't start until the power button was pushed, thereby allowing the complete boot sequence to be viewed.
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{{:hardware:trs_mounted.jpg}} {{:hardware:trs_mounted.jpg}}
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