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[wxsig] Ds1994, how to connect?

pedrolo2 at pedrolo.com pedrolo2 at pedrolo.com
Fri May 21 15:59:07 UTC 2010


Thanks John,

No it does not have solder tabs. I soldered wires on the temp sensor  
side, the i -button side are clamped with a plastic tweezers.

I will try to put more pressure on tweezers, just to discard bad contact.

Regards.

Pedro

John Koster <w9ddd at tapr.org> ha escrito:

> I've not looked at the spec. sheet for this particular device.  Does it
> have solder tabs?  The iDisc products I've used had stainless steel cases
> and won't take solder well.  Is it possible you don't have a good
> connection.
>
> On Fri, 21 May 2010 pedrolo2 at pedrolo.com wrote:
>
>> I will update software.
>>
>> I followed this procedure to test wiring:
>>
>> I got my temp sensor working. I soldered the ibutton wires. (data from
>> ibutton to data from temp sensor, and ground from ibutton to ground
>> from temp sensor).
>>
>> Wiring is good, as far as t238 can read the temp value.
>>
>> I am not using any kind of reader for ibutton, just the wiring, data
>> to data and ground to ground.
>>
>> ibutton reader does have any electronics? or it is just a mechanical holder?
>>
>> ds1994 is supposed to be a self-power device, so no other power suply
>> it's necessary.
>>
>> On programming the 1994, I used a Java software downloaded from
>> maxim's web site. Could be any parameters, i should ad to programming
>> procedure?
>>
>> Thanks in advance for your time.
>>
>> Best regards.
>>
>> EA5BFT
>> Pedrolo
>>
>>
>>
>> William Beals <will at beals5.com> ha escrito:
>>
>> > Pedrolo:
>> >
>> > SW Rev 1.15.4 is pretty old, it was the initial release to get the T238+
>> > out, I would recommend 1.16.1 which is the latest.  Lot of bugs have been
>> > fixed since then.  I am pretty confident your issue isn't related  
>>  to the SW
>> > rev, but you will avoid a lot of other issues that got fixed with  
>>  the later
>> > revisions.
>> >
>> > If you get no message regarding the DS1994 on power up and you know it is
>> > good, that pretty much leaves the wiring, is there any way you can
>> > independently verify that the wires to the ibutton reader are not  
>>  reversed?
>> >
>> > will
>> >
>> > -----Original Message-----
>> > From: pedrolo2 at pedrolo.com [mailto:pedrolo2 at pedrolo.com]
>> > Sent: Thursday, May 20, 2010 3:55 PM
>> > To: William Beals
>> > Subject: Re: [wxsig] Ds1994, how to connect?
>> >
>> > Thanks Will,
>> >
>> > I conected it, and after swith it on, when t238 starts, say will and
>> > russ... in memory of Dr. Morgan... and shows temp reading. No other
>> > message comes out.
>> >
>> > Wiring and connector has been discarded, I soldered the wires to the
>> > temp sensor, because temp sensor is working properly.
>> >
>> > 1994 is working on the pc, yesterday i programmed it. Today I have
>> > checked it and computer says it is less 1 second from pc clock, so I
>> > consider it is properly programmed.
>> >
>> > Just a note, sw is 1.15.4R, could this affect?, should i upgrade   
>> sw version?
>> >
>> > Note #2, ibutton is marked as LC1 DS1994L+F5, maybe it is another family?
>> >
>> > any idea? any test?
>> >
>> >
>> > William Beals <will at beals5.com> ha escrito:
>> >
>> >> Pedrolo:
>> >>
>> >> From your description, it sounds like you are doing everything correctly.
>> >> The T238 software looks for the DS1994's family ID on power up and if it
>> >> finds it, reads the time and sets its local clock to that time.   
>> If it does
>> >> find it, it displays a message on the screen saying it found a DS1994.
>> > The
>> >> only thing you didn't explicitly say was that you powered up the  
>>  T238 with
>> >> the DS1994 installed.  Just plugging it into a T238 that is already
>> > running
>> >> isn't going to work.  If, even after cycling power, you don't see the
>> > DS1994
>> >> message, all that is left is some kind of wiring issue and there are only
>> >> two wires on a 1-wire device (yes, I know, that doesn't make sense to me
>> >> either).  One thing to check is that whatever RJ11 connections you have,
>> >> have not swapped ground and the 1-wire signal.
>> >>
>> >> I hope it is something simple!  Let us know.
>> >>
>> >> will
>> >>
>> >> -----Original Message-----
>> >> From: wxsig-bounces at tapr.org [mailto:wxsig-bounces at tapr.org] On Behalf Of
>> >> pedrolo2 at pedrolo.com
>> >> Sent: Wednesday, May 19, 2010 3:31 PM
>> >> To: wxsig at tapr.org
>> >> Subject: [wxsig] Ds1994, how to connect?
>> >>
>> >> Hi to all:
>> >>
>> >> Recently I have adquired an ds1994 part from a canadian suplier.
>> >>
>> >> I have programmed it from my PC, and shows the current date, so it
>> >> should work properly, but when i attach it to the 238+, and power it
>> >> on, nothing happens, I go to "status" menu, and the date and time
>> >> values keep on old values.
>> >>
>> >> I just connect center pin (inside one) of ds1994 to the data cable on
>> >> 1wire bus, and the external to ground.
>> >>
>> >> Am I missing anything?
>> >>
>> >> Am I doing something wrong?
>> >>
>> >> Does the ds1994, need anything else to be interfaced to the 1-wire?
>> >>
>> >> Thanks in advance.
>> >> Best Regards.
>> >>
>> >> EA5BFT.
>> >> Pedrolo.
>> >>
>> >>
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>> >
>> >
>> >
>> >
>> >
>>
>>
>>
>>
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>
> --
> 73,
> John, W9DDD
>
>






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