[HomeBrew] Teletyper to ethernet current loop interface.

[Steven Weber]

> Hi, is it possible to make a unit that has full dublex loop current
> interface with a interface to LAN/ethernet with internal ip adress and a
> suitable tcp/ip port?

I would think its possible, but why?

For the loop interface, all you'd need is some opto-isolators and a constant 
current source. Speed would be limited by the speed of the opto-isolators 
and the length of the cable.

Current loops are usually used in industrial applications where noise is an 
issue and run at low speed. 4 to 20 ma current loops are used for 
instrumentation. Old mechanical teletype machines used current loops as they 
worked with switch contacts and relays.

KD1JV