Davezorz

iTrader: (2)

Has anyone ever repurposed large gauge wire for use in serial communications? Something like sending RS485 over #12 wire? I did it once in the past over a short distance, and it worked fine, but I am wondering if there are problems that would show up in a longer run.

Joe Perez

iTrader: (8)

How long of a run, and are you staying differential?

If you're trying to go a kilometer at a high datarate, I doubt that you're going to get anything even remotely resembling a balanced 120 ohm pair out of common #12 wire. But if you mean "a few tens of feet," then yeah, 485 is pretty robust.

Godless Commie

iTrader: (2)

Just got a phone call from the general manager of Mazda TR.

Apparently he would like to invite me to Barcelona, for the unveiling of the fourth generation MX-5.
I guess I will be the only guest attending the shindig from Turkey...

So there..

Davezorz

iTrader: (2)

It is probably no more than 250 feet. I don't have a real good feel because I don't know how the conduits are run. baud rate will be either 1200 or a blistering 9600, depending on the hardware on the remote end. I am going to try to get proper cables pulled, this is more of a last resort option.

Can you run RS485 non-differentially? I thought that was one of the defining features of the standard. We run it half duplex if that is what you mean.

triple88a

iTrader: (2)

I'm sorry to hear that man. I lost my dad on the 22 of last month.. he was 49. Truth is it doesnt stop hurting. I still remember him looking at me as he drew his last breath like it was yesterday. I wake up sometimes and go out and look in the parking lot that his car isnt there and for a flash i think to my self man hes out to workout early. And as soon as i think that i remember hes not coming back. The other day i heard the kitchen counters clunk at exactly the time he comes home and makes his lunch. I'm sure a lot of that is wishful thinking and even though i've never been religious I still like to think that hes up there.

My cats still look for him...

I don't know where i'm going with this just wanted to share my experience. It doesn't stop hurting. Many people will offer to talk to you. I personally didnt want to talk to anybody. Truth is anything anyone says wont make the person come back. What calms me down is thinking of the good times we had together.

Joe Perez

iTrader: (8)

250 feet at 9,600 baud is nothing. You could run RS-232 for that.


It is, but you can run anything non-differentially if you know how to cheat. The "proper" way would be to use baluns on either end, but if you're really fighting dirty, you can just ground one side through a resistor. It's a violation of the standard, but it's often "good enough." (I'm not suggesting that you do this- it was just a question.)

It sounds like you've got a firm handle on this, and for the distance and datarate you're looking at, I strongly suspect* that two untwisted 12awg wires will work fine, provided that there's not a huge amount of incident noise.

Erat

iTrader: (5)

I moved out of my moms when i was rather young. She had been sick for over 20 years. She had almost died on a few occasions, i even flew down to florida with my sister to see her in the hospital. It was rough for her. She had foot surgery and it kept her in bed for about 2 months. So her day to day life was already pretty horrible as it was, plus all the pills piled on top.
We buried her this morning. I feel bad for my grandpa, he's lost 2 sons and now a daughter. I wouldn't say she was a great person, but no matter who she is or was i will always love her because of who she was to me.
I almost regret not being close to her but i guess she ruined that for herself when she divorced my dad. Either way i feel little to no pain, i was probably the only one not to cry at the funeral.

concealer404

iTrader: (3)

Mother of god.

Toyota MR2 Spyder With Hardtop $8,800, W/O hardtop $6,800

sixshooter

iTrader: (12)

So lucky...

Have fun and take a couple of pictures. They will probably be giving away promotional gifts, too.

Davezorz

iTrader: (2)

I suspected as much, just was not sure what the relatively huge cable would do.

We are trying to man rate old atlas ICBMs, our budget is poor, so we are going to repurpose the guidance system on one of the MIRVs to control the rocket. New EPA material handling regulations prevents us from removing the physics package of said MIRV. Despite our best efforts, it keeps wanting to orbit Moscow. Not sure what that is about...


In truth, it is for a revenue metering circuit, so just $$$ at stake. Actually the site is right in your back yard (assuming you still live in that apartment in NJ)

Joe Perez

iTrader: (8)

The size of the cable, by itself, doesn't matter. It could be argued, in fact, that larger cable is always better since it has a lower resistance-per-foot.

Now, cable size IS a factor in computing impedance, pair-capacitance, velocity of propagation, and a bunch of other stuff that matters a lot in high-frequency circuits and can largely be ignored in low-frequency circuits. And 9,600 baud is most certainly a low-frequency circuit.

There's no reason, for instance, why you couldn't run ethernet over 4/0 welding cable, provided that you twist it properly and adjust the insulation and spacing to achieve the required specs.






Props awarded!

(Although the Atlas SM-65D is already man-rated, as the LV-3B, which was used during the latter part of Project Mercury, starting with Glenn's orbital mission in Feb 1962.)



Interesting. I'm still in NJ for the next few days. Moving to a 3br apartment upstate this weekend with the woman.

shuiend

iTrader: (24)

You leaving the radiator heater for the next tenant?

Joe Perez

iTrader: (8)

Haven't decided what to do with that yet... I may try to sell it on eBay as a radiator for extreme PC overclocking.




Sidebar: Thanks to all those who pressured me to buy an '01-'05 Miata. The chassis rigidity really is as good as everyone claims, and I am finding that the engine in stock form makes nearly enough power. (Now I understand why all those folks who put MP62s on these cars claim to be satisfied with their performance.)

Anyone who claims that the late NB is less rev-happy, less tossable, etc., than a '90-'93 car is an idiot. Yes, it is larger and heavier than a '90. So is a Porsche 911 GT3 RS.

Erat

iTrader: (5)

Eh. My 01 is like a Buick compared to my 94. Even my 94 in stock form, though it was an R package car. I guess the few upgrades the NB has makes it seem a bit more fun. It is way more rev happy though, i very often find the fuel cut without realizing it.

z31maniac

Same way I feel about the NB to NC comparison.

Joe Perez

iTrader: (8)

So, it turns out that Direct Exhaust Injection is actually a real thing. Specifically, it's an experimental form of Air Independent Propulsion for non-nuclear submarines. Take the exhaust, condense the water vapor and CO2 out of it, add back in some pure oxygen to re-balance it, and send it right back into the engine again. No intake, no tailpipe.



Patent US3559402 - Closed cycle diesel engine - Google Patents

http://www.navy.mil/navydata/cno/n87...propulsion.htm



Seehund - One35th present the German midget submarine - Operations and History

FRT_Fun

iTrader: (19)

So I was driving my GF to work today and some ******* proceeds to cut me off, it wasn't horrible so I didn't think too much of it. I look over as he moved over to the next lane and he looks like he is about to try some **** so I haul *** past him.

I think it's over and next thing I know he is on my ***. Like two feet away. I try to separate from him as much as possible without getting reckless. There is some traffic so I am hoping that helps. It doesn't. He then proceeds to get around me, roll down the window and throw change at my car.

Now the great part. I have a dash camera, and it is ALL ON TAPE. This scum is going down. Calling the police department today and handing over the video. I'll post it later if I can (not sure how that works if it is evidence or whatever).

Anyways so happy I have the dash cam now. This is the first time in my life where it would have helped me and I had one. Always thought I was wasting my time getting the GoPro out and keeping it charged and the memory card empty. It all pays off today.

I have a chip in the window and I think some bumper damage as well. We were going high way speeds when he did it, so it hit with a lot of force. I hope that **** didn't hit my intercooler, but I plan to inspect it more later today after I see what the Police say.

Anyways, count 1 for the good guys.

mgeoffriau

iTrader: (7)

I worked with a guy that got pissed when a car was riding his bumper so he opened his sunroof and tossed a handful of change back that hit square across the windshield. Turns out it was a unmarked police car. It was not a good day for him.

FRT_Fun

iTrader: (19)

I'm cool with road rage type **** until it involves damaging someones property. I've had this car all of two months, and some low life scum has to **** it up because they don't care about anyone but themselves? I am so happy I have it on video or else this kid would see zero consequences.

The operator (non-emergency number) said there was nothing I could do. I lol'd and said let me talk to an officer. He was all on board and told me to send the video to him ASAP and he would at the very very least go knock on the door and talk with them. I am going out to check damage now, if the spots in the window look like they could crack, or the bumper is damaged I am pressing as many charges as I can. Everyone makes mistakes, but you learn from the consequences.

Godless Commie

iTrader: (2)

I'm willing to bet that guy was in a 'Murican car.

Some idiots in a souped up bimmer tried that **** on me over here, I just put the pedal down and moved away about a quarter mile from them.
Because fast car and no speed limits.