[GreenKeys] de K8WXQ HAL ST-8000 TU HelloRS-232 to Teletype 60mA LOOP Circuit

[atynmtc at provide.net]

Hello  2/24/2026
I am getting ready to run a Model 28ASR Teletype. It has not arrived 
yet, so I do not know its requirements? I wonder if there as a circuit I 
can fabricate to connect the HAL ST-8000 (Not A) with RS-232 to drive a  
60 or 20 mA Teletype LOOP using a 120VDC Power Supply.  Presently, I am 
looking at the isolated output Circuit for a HAL DS-3100 Terminal with 
Opto-Isolators (4N35) for TX and RX.  Anyone out there in Teletype Land 
have any experience connecting RS232 to a Teletype LOOP???  Are there 
any ready to go units available for this task?
Thank you so much. Al K8WXQ.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20260224/24eacd66/attachment.html>