[GreenKeys] A reliable current-loop-to-RS232 converter

[drlegendre .]

Yeah, that's a good point (re: pre-built converter boards). I bought
several of those as well, and they seem to work just fine. I suggested the
MAX232 as I thought that the OP already had the connector side of things
covered.

On Sat, Aug 15, 2015 at 7:34 PM, Jeffrey D Angus <jdangus at att.net> wrote:

> On 8/15/2015 7:21 PM, Bob Camp wrote:
>
>> The fine people “across the sea” will gladly sell you a RS232
>> <-> TTL converter mounted on a board with connectors.
>>
> Here's a pair of the for $3.66.
> That gives you a spare to use after you set fire to the first one hooking
> it up wrong.
> <http://www.ebay.com/itm/190897161765>
> Just the chip alone is $2.18 from Mouser. ($4.36 for two)
> Add a pair of connectors at $1.99 apiece....
>
> This is exactly what I did for my loop converter. I used the RS-232 to
> TTL "function block" as the basis, then added the required buffering,
> logic correction, opto-isolation and such to it along with a built in
> power supply.
>
>
>
> --
> Jeff-1.0
> wa6fwi
> http://www.foxsmercantile.com
>
>
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