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rs232 thermometer

grounded.

Linux

:o)

I haven't actually built this, but looking at the schematic for the hardware it should work if the software drives it correctly. While they are using a serial port, it doesn't actually use the TXD/RXD lines since the DS1621 is not an asynchronous device which makes troubleshooting a bit more difficult.

Do you have access to an oscilloscope? If so, try monitoring the SCL and SCA lines to see if you are getting reasonable signals to the DS1621's. You might have to write some "disposable DOS code" to repeatedly drive the signals from a tight loop so you can get the scope to display something if you don't have access to a storage scope.

Good luck and let us know how it turns out.

--
James T. White
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James T. White
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Has anyone made this before and got it to work?

The reason that i am asking is that this is my first EVER attempt at making a circuit and guess what... it doesnt work!

I have tested the circuit using a volt meter and i get the correct voltage at the chip (+5v) and all of the gnd points are, well grounded.

What i dont know is if it is something that i have messed up or the software provided that is at fault! I have tried the software of a Linux box and have tried the windows version too... both with the same board and both with the same results... Err-14. Now i have checked the suggested fixes for this error and none of them work.

Any help, ideas or suggestions? (other than hit it with a large hammer :o)

Thanks

Cuprager

Reply to
Cuprager

I know someone who has a scope, so that will be my next port of call... I should get to see them next week some time. Thanks for your reply!

Reply to
Cuprager

"Cuprager" schreef in bericht news:dmpnea$i6g$ snipped-for-privacy@dennis.cc.strath.ac.uk...

Yeah, but according to the webpage you mentioned Er-14 means: "Can't open COM-port." So I guess you have a problem on the PC-side. Is the COM-port you want to use known by your operating sytem? If not is it activated by the BIOS? If it is known, is it in use by some other program or process? Fiddling the hardware has no use as long as the software can't open the COM-port that hardware has been connected to.

petrus bitbyter

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petrus bitbyter

Thanks for your reply petrus,

As i mentioned in my original post, i have checked the suggested fixes for this error, including the COM port issue. I can open and use the COM port using a different application. Also, when I connect the circuit that i have made to the com port and run the software provided I can see the Voltage changing at Vin from a -12v to a +12v. I get the same results on two separate machines, one running XP and one running Linux.

I have given the circuit to a friend who is going to check it for errors and analyse the output on a scope - like i said, i am new to this and this is my first circuit, so i am unsure if i have made a mistake with it or not! :o)

Best Regards

Reply to
Cuprager

UPDATE !!

I have made the circuit work! It was, a simple error, i had not broken the track on the vero board under the diodes! now thats fixed it works a treat... thanks for your advice.

Reply to
Cuprager

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