[GreenKeys] 60 ma current loop to RS232 converter

[Pete Lancashire]

True .. I only got them for the 33 and 35's

I'll take a look inside one of them

-pete .. where did i put the Sawzall

On Sat, Feb 24, 2018 at 7:38 PM, Jim Haynes <jhhaynes at earthlink.net> wrote:

> On Sat, 24 Feb 2018, Pete Lancashire wrote:
>
> From time to time on Ebay you can find Black Box 323/CL-E boxes at quite
>> good prices, I bought 3 new on the boxfor $50 included shipping.
>>
>> http://ftp.blackbox.com/manuals/C/CL051A(E)(C)%20Manaul.pdf
>>
>> The spec is 20 or 60 mA. I've not tried one at 60 mA but is in the spec
>>
>> -pete
>>
>
> And here we always warn that most such devices are designed to work with
> low-voltage current loops as in the Teletype Model 32/33/35 family, and
> not with the older equipment that uses 120 volts at 20 or 60 ma.  For
> the latter you need something like a high-voltage transistor or a solid
> state relay IC.
>
>
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