Unfortunately no one can be told what fun_plug is - you have to see it for yourself.
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Hi all. I'm trying to establish a serial connection with my Rev C1 DNS-323. I have the wires correctly identified (I've triple checked), and the soldering looks good (no bridges), but I am getting no feedback via terminal when trying to boot it. Loopback works when I connect TX and RX wires (I can type characters, and they appear on-screen), and oddly, I get the readout of it booting when they are wrapped together, but I am unable to input. It made me think that I had the RX/TX switched, but I've gone back and checked them yet again. Any idea what the problem could be?
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I take it you realise that one device's TX line has to connect to the other device's RX line?
The fact that you can see the DNS-323's output when the lines are "wrapped" does suggest that there is a "mis- connection" somewhere - so swap one set of TX/RX lines and see what happens.
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I should have mentioned that I'm using a Nokia cable, so one end is USB. The cable is USB powered, so I only have three wires connected. I may try and de-solder the wires and swap them, but I'm 99% sure I've got them identified correctly.
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A good plan of attack whenever doing this sort of thing is to install a header rather than solder directly to the mobo.
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Ha, wouldn't you know it. An elementary mistake. I had the TX and RX fed into the TX and RX, respectively. Thanks fordem! Funfiler: I considered doing it, but I had trouble locating headers that weren't .01 spacing. The spacing of the serial seems smaller on my C1 board. Attempting to unbrick my DNS-323 now.
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You're welcome - I was pretty certain that's what it was - I know I'm showing my age here, but that stuff is what I cut my teeth on, and it's a fairly common mistake.
I still use serial comms fairly frequently and the problem I'm faced with is that new laptops with serial ports have become impossible to find - I'm using a six year old Dell - yes, USB-serial adapters are plentiful & cheap, but I have very good reason to dislike them.
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I agree fordem, I hang on to a number of old systems for the very same reason. A P120 is pathetic these days, but for flashing firmware via a serial port it is gold. I've been able to repair numerous (about 20 now) satellite receivers which were "dead".
Last edited by FunFiler (2011-07-16 05:32:44)
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Just wanted to post a quick update. This morning, I was finally able to successfully restore my DNS-323. Thanks again for the help. I'll definitely be keeping this forum bookmarked.
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Awesome news
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