Current Loops and TTYs (was Re: New batch of pdp8 OMNIBUS to USB interface! Please Read and react!)

Ethan Dicks ethan.dicks at
Tue Feb 14 15:34:03 CST 2017

On Tue, Feb 14, 2017 at 4:22 PM, Philipp Hachtmann <hachti at> 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).


More information about the cctech mailing list