[GreenKeys] USB-teletype adapter with ASR33 question

[Julien Scrofani]

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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