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

[highpwr at bellsouth.net]

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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