[GreenKeys] USB-teletype adapter with ASR33 question

[Eric]

I don't know much about how asr33's are wired - I assume they're
normally used full duplex, and from what Julien has seen, it appears to
have at least one built-in loop supply - does it have a second for the
other direction, or does it expect "the other guy" to provide that? If
so, I imagine he could just add a small DC power supply and resistor to
accomplish that? 

eric 

On 06/07/2016 1:29 pm, Julien Scrofani wrote: 

> Hi all, 
> 
> I bought Eric's usb adapter to link my asr33 tty to a PC. 
> As is, I can transfer from PC to the tty but I cannot transmit in the other way, tty toward PC. 
> 
> I know that current loops are needed. 
> It works for one way without additionnal power supply, so maybe my 33 has an internal current loop. My problem is I'm not able to determine if it's really the case and I don't how to add one if I need to. 
> 
> I have no electronic knowledge at all, sorry if my question is a dummy one ! 
> Thank you in advance. 
> 
> Bests regards, 
> Julien 
> 
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