[ts-7000] Re:Using DIO to implements a current loop transmiter

[Tom Lafleur <>]

> what you need is a device like
> this one...   it converts the 4-20ma ANALOG signals to a 0 to 5
> volt analog signal that you can feed into an (ATD) analog to digital
> converter on the TS board. Ie: its an ANALOG signal not
> digital!!
>
>                            http://www.elkor.net/et420.htm (many firm build unit like this)
>                            http://www.deskeng.com/articles/aaanbn.htm
>
>
> If you have some design skills, it a 1 IC design to convert to a 0-5v
> analog voltage...
>
>                            http://freecircuitdiagram.com/2008/10/23/rcv420-single-chip-precision-4-20ma-current-loop-receiver/
>  
>                            http://docs-europe.electrocomponents.com/webdocs/0cca/0900766b80ccaa4a.pdf
>  
>
>
> some good reference
>
>                            http://www.bapihvac.com/CatalogPDFs/I_App_Notes/Understanding_Current_Loops.pdf
>  
>                            http://www.scribd.com/doc/5595442/420mACurrentLoopPrimer
>
>
> the device in the TS forum is NOT what you need, it a serial 20ma to
> rs-232 adapter (used with older ASR33 Teletype machine) not the analog
> signals that you are looking for..
>
> doing a search on the web you can find a lot of information on 4-20ma
> circuits

~~ _/) ~~~~ _/) ~~~~ _/) ~~~~ _/) ~~

Tom Lafleur
(858) 759-9692

__._,_.___

Your email settings: Individual Email|Traditional
Change settings via the Web (Yahoo! ID required)
Change settings via email: =Email Delivery: Digest | m("yahoogroups.com?subject","ts-7000-fullfeatured");=Change Delivery Format: Fully Featured">Switch to Fully Featured
Visit Your Group | Yahoo! Groups Terms of Use | =Unsubscribe

__,_._,___