only two

[rmteo]

The solution in the thread you linked to looks like it can only supply a small current to the slave (I'm guessing in the order of less than a few mA) - correct me if I am wrong. If the slave has to drive some outputs (say a motor or a lamp), do you know of a way that will allow the slave to drive a load of say 1A or more?

[mackrackit]

Do a search for DCC. There was some talk about this a while back. Someone was doing a similar app with truck and trailer wiring, but I can not find it now.

[rmteo]

Thanks, Dave. I'm familiar with the workings of Digital Command & Control - checking to see if there is anything else out there.

[BobK]

Hi rmteo,

The request was for communications between 2 PICs over 2 wires. Not to supply current to drive a motor or lamp remotely. If you want that then you could control a remote power source or should consider something along the lines of X-10. There you can run a 12/2 or 14/2 110VAC cable and use the X-10 commands to turn lights or motors on and off without the use of PICs. I am in the alarm business. We have several alarm device manufacturers that have devices that have both power and communication over two wires but none of the devices actually draw more than a few ma's of current. The other option is RF controlled devices.

BobK

[Charles Linquis]

You need to use a drive using a voltage regulator. I believe Melanie has posted a method. Look for that.

[rmteo]

Hi rmteo,

The request was for communications between 2 PICs over 2 wires. Not to supply current to drive a motor or lamp remotely. If you want that then you could control a remote power source or should consider something along the lines of X-10. There you can run a 12/2 or 14/2 110VAC cable and use the X-10 commands to turn lights or motors on and off without the use of PICs. I am in the alarm business. We have several alarm device manufacturers that have devices that have both power and communication over two wires but none of the devices actually draw more than a few ma's of current. The other option is RF controlled devices.

BobK

Thanks. As Dave mentioned and I replied, DCC does it and I am familiar with the technique.

[pramodsinha]

Thanx for the support got from diffrent sources i have to send data only so i need only very small curent. But still i need more illumination on my quirry to start my R&D work but still this is highly appreciable.

[sougata]

Dear All,

I know to some extent the solution Pramod is looking for. He needs a multi-master multi-slave RS485 multi-drop network of <b>sensors</b> wired over a distance of more than 1500 meters. The total number of sensors could be upto 255. More of like a CAN.

PS. Dave were you mentioning this thread : http://www.picbasic.co.uk/forum/showthread.php?t=9406