HELP!!!! SEMI BRICKED ROUTER

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strubedo
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Joined: 05 Jun 2010
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PostPosted: Thu Oct 07, 2010 17:28    Post subject: HELP!!!! SEMI BRICKED ROUTER Reply with quote
Can someone tell me how to make a serial cable for my Buffalo WZR-HP-G300NH I have already solder the pins on the board I do not want to have to order a cable and wait for days can someone tell me how to make one by maybe getting the parts at Radio Shack?
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strubedo
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Joined: 05 Jun 2010
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PostPosted: Thu Oct 07, 2010 17:49    Post subject: Screenshot Reply with quote
I used a serial to usb adapator and used a D9 cable to interface with the Serial pinouts on the board it seems to work but i get a bunch of garbage can someone explain this to me?
LOM
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PostPosted: Thu Oct 07, 2010 18:00    Post subject: Reply with quote
If you used the type of USB<->Serial converter that you normally buy in a computer shop, then you have the wrong one and it usually produces garbage like that.

That type of USB<-> Serial is for RS232 ie +-12V levels while your router has TTL 3.3V levels on its serial port.

You need a level converter and that is why mobile phone cables like Nokia DKU-5 or CA-42 are so popular, they go directly from USB to TTL 3.3V.
You can also buy this type of USB<->TTL 3.3V level converter as a small module from electronics suppliers.

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BrainSlayer
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PostPosted: Thu Oct 07, 2010 18:36    Post subject: Reply with quote
check also the baudrate. it must be 115200
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fyi2000
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PostPosted: Thu Oct 07, 2010 18:41    Post subject: Reply with quote
Use a Nokia Serial Cable on an ARM9 Linkstation - NAS-Central Buffalo - The Linkstation Wiki
sco77
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Joined: 13 Jul 2008
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PostPosted: Thu Oct 07, 2010 23:59    Post subject: Reply with quote
I used a Nokia CA-42 cable to debrick a 1043nd, cost me $3 after shipping. This one to be exact http://www.amazon.com/Data-Cable-Nokia-3585-CA-42/dp/B000BI4HQY/ref=sr_1_2?ie=UTF8&qid=1286495181&sr=8-2.. With that particular cable white = TX and yellow = RX , all different cables have different color code though.

Pic of my temp setup that I used:


BrainSlayer wrote:
check also the baudrate. it must be 115200


Yes this caused me a lot of stress and re-soldering, due to garbage output.. This step is required.
fyi2000
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Joined: 04 Apr 2010
Posts: 642

PostPosted: Fri Oct 08, 2010 8:20    Post subject: Re: Screenshot Reply with quote
strubedo wrote:
I used a serial to usb adapator and used a D9 cable to interface with the Serial pinouts on the board it seems to work but i get a bunch of garbage can someone explain this to me?

Break it off and you should find two chips, one to convert USB to +3.3V LVTTL RS232 and the other from +3.3V LVTTL RS232 to RS232. The later could be a MAX3232. Locate the +3.3V TX/RX and connect to WZR-HP-G300NH.

Below pic just to give you some idea.


Search "RS232 TTL MAX3232" or "RS232 TTL USB" on eBay and you'll find what you need. This one for example is made from Nokia CA-42 and you don't have to solder by yourself. I'd prefer cables which contain Prolific PL2303 USB to serial converter because the driver is easy to get.

This one, USB2.0 to RS232 TTL Converter Module PL2303 +4pcs cable, for USD $5.5, free shipping



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