[GreenKeys] Hall ST-8000 and driving / switching a loop?

[highpwr at bellsouth.net]

Thanks again to everyone, that’s kinda what I was looking for in fact I had run across  the info that Jim posted before, and a video of a guys using that exact circuit, he claimed (and I believe he's right that the resistor R2 on the Loop In section should be around 1k instead 100 ohms)  just couldn't locate the info searching.  In this video he was using a model 15 with his PC or made a PDP setup, the video link was circulating a few months ago.

Steve 

-----Original Message-----
From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of highpwr at bellsouth.net
Sent: Friday, December 4, 2020 4:39 PM
To: 'Greenkeys' <greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] Hall ST-8000 and driving / switching a loop?

Thanks for all the replies,  I have been studying the ST-8000, and knew it could not switch / control a current loop directly, was just wondering if someone had designed and built one already and done the hard work for me...Hi Hi,  I'll look at the LP-1210 manual and study one circuit (don't need 10)  I would also be interested in a copy  LP1200 manual.

I figured something could be done with opto isolators and possibly additional hardware to use the low voltage out from the ST-8000 to control the loop, just wondered if someone had already been down this path.

Also realized that I could use the regenerated output to drive something like an ST-6, or CT2200 both of which I have.

A loop supply is no real issue as I have scene several simple circuits for this
 

Any and all ideas are welcome.

73,
Steve



-----Original Message-----
From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of William Wuttke
Sent: Friday, December 4, 2020 2:08 PM
To: Greenkeys <greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] Hall ST-8000 and driving / switching a loop?

I’m using a M28ASR with an ST-8000. It definitely requires some sort of RS-232 to loop converters. I had all sorts of trouble trying to get it to work with a single loop. I finally ended up separating the keyboard and printer for a full-duplex hookup. I used simple optoisolators for converters.

Bill
KE3BK
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