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

[Jeffrey D Angus]

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