Current Loops and TTYs (was Re: New batch of pdp8 OMNIBUS to USB interface! Please Read and react!) - test-drb@ccmp.vtda.org

14 Feb 2017

On Tue, Feb 14, 2017 at 4:22 PM, Philipp Hachtmann <hachti at hachti.de> wrote:
...
    PS: Add a 45.5 baud serail port. Control everything
with a  5 level
 TTY. :) 
 Dirty casual.  20mA current loop or nothing. 
 The 45 baud machines do NOT run on 20mA. They usually run on 40mA :-) 
The M19 is 60mA at 100VDC... takes a bit to pull that relay.

...
  20mA is the domain of model 28, 32, 33 etc. 
Yep.  That's all I have in my own pile... (33 and 35).

-ethan