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

[Bob Camp]

Hi

The same fine person will also sell you 10 PC817 (or TLP521-1’s) opto’s if you need them. 
He’ll also toss in some 2SK2645 600V MOSFET’s for not much more. 

Enough parts to build several (minus power supply) look like they aren’t going to set 
you back more than $20 delivered.

Bob

> On Aug 15, 2015, at 8:34 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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