Communication method for long distance 3coreelectrical cable

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Mesut_yigit

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Hello
In my last project , I have to find a reasonable way to communicate 2 PIC devices in a 3 km distance. Communication rate can be as low as 115 Baud. The one pic will send a couple of values to other , uni directional communication scheme. The communication will be performed over an classical 3 core , 2.5 mm2 electric cable that does not used to carry electricity anymore. Because of the geographical conditions , I have no chance to replace that cable with a usual comm cable.

Could someone suggest a proper way ?
 

Re: Communication method for long distance 3coreelectrical c

This looks like a job for very old telephone modem technology. Some of the original formats from 25+ years ago were 110 bits/sec to 300 bits/sec.

If you cannot find any hardware for this, you can make your own by using FSK on two carrier frequencies (one for each direction) that are well separated.
 

Re: Communication method for long distance 3coreelectrical c

Hi,

Dont know what you have ( cable wise ), but there is an easy way:

More info on **broken link removed**
Its easy to implament with 1 IC that converts the UART into RS-485. Depands on how many wires you have, you can use Half Duplex, or Full Duplex.
More information you can find on google, or here if you ask for somehting specific.

Good luck.
 

Re: Communication method for long distance 3coreelectrical c

Ofcourse You can use modem to comunicate. You can use modem and control it by mcu. Then I think that it is ok.(no speed, no distance problem)
 

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