A lot of temperature probes?

masasaarnela · Post by **masasaarnela** » Wed Apr 21, 2004 2:15 am

I have several Dallas DS18S20 temperature sensor plugged to USB. As you may know, one can connect tens of sensors to one USB-plugin.

Is it possible to connect several DS18S20

Johnny · Post by **Johnny** » Wed Apr 21, 2004 2:53 am

[quote="masasaarnela"]I have several Dallas DS18S20 temperature sensor plugged to USB. As you may know, one can connect tens of sensors to one USB-plugin.

Is it possible to connect several DS18S20

Post by **Henry** » Wed Apr 21, 2004 2:53 am

You can connect up to 32 temp probes to the MX in TOTAL. We have included one 1-wire port on the display and all the headers are just on that one data line, so like I said, you can connect 32 in all to the display.

{edit} beat to it..

masasaarnela · Post by **masasaarnela** » Wed Apr 21, 2004 3:38 am

Henry wrote:You can connect up to 32 temp probes to the MX in TOTAL. We have included one 1-wire port on the display and all the headers are just on that one data line, so like I said, you can connect 32 in all to the display.

{edit} beat to it..

Of course 32 temp probes is enough for almost everybody, even for me

, but why to limit temp probes amount to 32? Let me quess: more probes take too much processing time?

Anyway. Thank you for your reply. That was just I wanted to know about.

Miles · Post by **Miles** » Wed Apr 21, 2004 4:39 pm

In theory you can probably connect hundreds in series but of course you would have to take into account the length of transmission. The reason we said 32 is that we feel comfortable with this number and anything beyond that, your in unchartered territory. As for length, we tested 6 probes at 1 meter each with no issues but anything beyond that, your on your own. You must be aware that when data is being transmitted via a medium, the quality of the medium is very important!!

masasaarnela · Post by **masasaarnela** » Wed Apr 21, 2004 11:30 pm

Miles wrote:In theory you can probably connect hundreds in series but of course you would have to take into account the length of transmission. The reason we said 32 is that we feel comfortable with this number and anything beyond that, your in unchartered territory. As for length, we tested 6 probes at 1 meter each with no issues but anything beyond that, your on your own. You must be aware that when data is being transmitted via a medium, the quality of the medium is very important!!

Sorry for a long quote. I have plugged together 5-6 DS18S20 (with Dallas USB-port). Some probes are near, some about 40 to 50 meters, the others are in between. I have been measuring with this combination about seven yrs now without no problems. Ok, there has been some troubles: Thunderstorms have hit nearby and so much for the probes!

I have never been in difficulties with those measuring distances and according to my opinion, results of quality have always been very good.

Of course I have not tested this combination with MX2, so I cannot say anything about this. But I trust in your words and I do not even try

If someone has tested MX2 with long distance cable I

Miles · Post by **Miles** » Thu Apr 22, 2004 8:43 am

By all means you should give it a try...I didn't mean to persuade you from trying, all that I was stating is that we have not tested the digital temperature sensors with the MX Series at such distances!

If you do try it out, I'd be very curious to know your results!! By quality, I meant the quality of cabling, connections, etc. and not the quality of results.

masasaarnela · Post by **masasaarnela** » Tue Apr 27, 2004 2:40 am

Miles wrote:By all means you should give it a try...I didn't mean to persuade you from trying, all that I was stating is that we have not tested the digital temperature sensors with the MX Series at such distances! If you do try it out, I'd be very curious to know your results!! By quality, I meant the quality of cabling, connections, etc. and not the quality of results.

I can run the test after one week because of missing WOL-plugins.

I have connected 5 DS18S20 to USB-port (Dallas DS9490) like this:

-------Ground----------|
DS18S20------ Data---- |
-------Vdd--------------|

Ground and Vdd are connected together.

MX2 seems to need all wires connected to WOL. Is it safety to connect those five DS1820

Johnny · Post by **Johnny** » Tue Apr 27, 2004 4:42 am

masasaarnela · Post by **masasaarnela** » Tue Apr 27, 2004 5:23 am

[quote="Johnny

Johnny · Post by **Johnny** » Tue Apr 27, 2004 8:43 am

[quote="masasaarnela"][quote="Johnny

Miles · Post by **Miles** » Tue Apr 27, 2004 8:45 am

Are you sure you have this connected as represented in the pic?

masasaarnela · Post by **masasaarnela** » Tue Apr 27, 2004 9:23 am

[quote="Johnny

masasaarnela · Post by **masasaarnela** » Tue Apr 27, 2004 9:31 am

Miles wrote:Are you sure you have this connected as represented in the pic?

Hey! I like sceptical people!

Sure I

masasaarnela · Post by **masasaarnela** » Tue Apr 27, 2004 2:17 pm

Miles wrote:Are you sure you have this connected as represented in the pic?

Those 5 DS18S20

A lot of temperature probes?

A lot of temperature probes?

Re: A lot of temperature probes?