[GreenKeys] printing to KSR 28 was Re: OT: Radio Shack near bankruptcy

[Jack Hart]

The Black Box units are usually only good for 30VDC (for
32, 33 or 35 TTY's. The ones that can do HV loops are very rare.


-----Original Message-----
From: GreenKeys [mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of John
Foust
Sent: Friday, November 14, 2014 7:23 PM
To: Green Keys
Subject: Re: [GreenKeys] printing to KSR 28 was Re: OT: Radio Shack near
bankruptcy

At 09:49 AM 11/7/2014, Kevin H. Phillips wrote:
>Didn't someone on the list develop a RS-232-to-loop converter circuit and
board?  What about the "Black Box" converters that occasionally turn up on
auction sites?

This is a frequently-asked-question, no?

I've been meaning to acquire one for my Model 28 KSR and ASR-33.

I would think you couldn't go wrong with the Black Box ones.  I see one on
eBay now for $65 BIN and are still for sale new at $270.  
It can be config'd to 20-, 30- and 60 mA, and has optical isolation on
receive.  It's RS-232.  I'd also need a good USB to RS-232 adapter that
could handle the necessary low speeds and 5 bits.

I tried to look on 45baud.net for a project previously mentioned here but it
looks like it's suffering PHP errors.

I guess this means I need to get a Model 15 at some point, just to go back
another twenty years.

- John

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