Long range Camera

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#1
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Hai

Could I ask something here?

Was someone experienced with this?

Uart/serial camera---rs(422)++++1km++++rs-422--PC serial

Jeckson

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How much is the data rate of the camera?

For shure you'll need a shield cable to protect your signals...

Regards,

Bruno Muswieck

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I don't know about 422 but RS-485 is good for 1200m at 100kbps according to the specs.

______
Rob

Scattered showers my arse -- Noah, 2348BC.
Rob Gray, old fart, nature photographer, embedded hardware/software designer, and serial motorhome builder, www.robgray.com

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Quote:
How much is the data rate of the camera?

115.2Kbps

Hai Rob

Quote:
I don't know about 422 but RS-485 is good for 1200m at 100kbps according to the specs.

Did you ever tried rs-485 with that speed? from Rob truck to Nature.. :wink:
Where's is location? did you near Bromme? we have memories there.

Jeckson

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Hummm....

I really don't, no experience on that... Sorry...
Did you already test it on lab?

Regards,

Bruno Muswieck

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Quote:
Did you ever tried rs-485 with that speed?

No, that's why I covered my arse with "according to the specs" :)

Quote:
Where's is location? did you near Bromme?

We're pretty close, maybe 1000k or more, not that far by our standards. Camped out in the bush in central Western Aus.

______
Rob

Scattered showers my arse -- Noah, 2348BC.
Rob Gray, old fart, nature photographer, embedded hardware/software designer, and serial motorhome builder, www.robgray.com

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Maybe you could try a lens.

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I have done 1.5km RS485 in an industrial setting. The bus in question was 76800, but from the observed waveform I would say 230400 would still be safe.
The cable was IBM Twinax, the thick stuff from the the mainframe terminal age.

in the lab I have 1.2km of cat5 for testing (4 passes in 300m), and 76800 on that is fine too when terminated into 100 ohm.

/Kasper

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Great info...

KKP/Kasper.

Quote:
in the lab I have 1.2km of cat5 for testing (4 passes in 300m), and 76800 on that is fine too when terminated into 100 ohm.

Thank's

This avoid me for testing with 100US$ cost.Many thank's

Jeckson

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With a bus that long, remember that you'll have induced voltage. You'll need ground equalization, such as using the the shield of a cable, or a wire in the same cable. And you'll need isolated transceivers at the ends to keep ground currents out. Plus the usual protection components for lightning.

LTM2881 is cute but not dirt cheap.

/Kasper

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Quote:
With a bus that long, remember that you'll have induced voltage. You'll need ground equalization, such as using the the shield of a cable, or a wire in the same cable. And you'll need isolated transceivers at the ends to keep ground currents out. Plus the usual protection components for lightning.

LTM2881 is cute but not dirt cheap.

Thank's for info.

with RJ-45 cable.The Chip with MAX488/388 or 75176/5

Burried below sand/soil.

Thank you

Jeckson

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What about using Ethernet ?

Fiber/Cat5 Ethernet extenders are not that horribly expensive and you can use off the shelf equipment. There are serial-Ethernet converters too. Also, if you want to replace your camera down the road you can use a Ethernet camera too.

http://www.versatek.com/products/ethernet-extenders.htm

Markus

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Thank you

I'm became more thirsty..How's about voltage drop at that RJ-45/CAT5 in 1Km distance?

Markus thank's for advice but the ethernet chip and related still expensive to me..

Regards
Jeckson

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Quote:
How's about voltage drop

How about buffers, line drivers?

--greg
Still learning, don't shout at me, educate me.
Starting the fire is easy; the hardest part is learning how to keep the flame!

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RJ-45 is a us FCC-registered/standardized pinout for one telecomms data line.

Cat5 is about 0.1ohm per meter per conductor. 2*1km is 200 ohm. With 100 ohm termination on the far end you have 1/3 out. You'll be driving ~3V into the line, so 1V on the far end. Which is plenty.

If you are asking about supplying power over a pair, if you have 48V on the feed end, and 24V on the load end, that's 24/200=120mA out, or 2.88W.

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Hai
KKP/Karpers.

Quote:
With a bus that long, remember that you'll have induced voltage. You'll need ground equalization, such as using the the shield of a cable, or a wire in the same cable. And you'll need isolated transceivers at the ends to keep ground currents out

Quote:
If you are asking about supplying power over a pair, if you have 48V on the feed end, and 24V on the load end, that's 24/200=120mA out, or 2.88W.

Yes,Exactly..The PS form PC/Notebook to avoid 1st red quote above.

Thank you
Jeckson

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