[GreenKeys] RS232 to TTY Loop

[Randy and Sherry Guttery]

On 2/19/2011 9:27 AM, Wa3frp wrote:
>
> Hi guys,
>
> I was wondering if anyone has a solution for me.
> I am looking to key my 60 ma teleprinter loop from my laptop using the RS-232 interface.
> I see that Gil had a solution about ten years ago (no longer available) called tty232.
> Is there anything else available?
You don't mention which model teletype you are trying to 
drive - but a solution that works for some (esp. 28 and 
newer machines) are those BlackBox CL050 232 - current loop 
adapters... the only issue with them is the loop keying 
voltage is limited to less than 30 volts. I don't think it'd 
take much to modify them to handle more "typical" voltages - 
but since it keys my 28KSR just fine - I've not bothered 
trying.   I bought several some time back when a bunch 
showed up for what seemed to be a low price (at least to me).

best regards...

-- 
randy guttery

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