[GreenKeys] Does anyone have any experience using the L-Com RS232 to Current Loop Converter with a Mod 33 Teletype?

[Mike Douglas]

John,

Both the transmit and receive loops are passive on the Teletype. You’ll have to set the adapter to “active” and let it provide the current for both loops (I see you chose “passive” in the settings you list).

Or, do it the easy way...
https://youtu.be/PNbo46Yw92M

Mike D

> On Oct 19, 2018, at 4:46 PM, <john at toebes.com> <john at toebes.com> wrote:
> 
> Ok I’ve gotten my Current Loop Converter adapter (  http://www.l-com.com/serial-converters-controller-cards-economy-rs232-to-current-loop-converter-with-4-pin-terminal-block
> ) and what I thought was the obvious way of connecting it doesn’t seem to result in success. 
>  
> I’ve connected
> 1 <-> TTY Send pin 3
> 2 <-> TTY Send pin 4
> 3 <-> TTY Receive Positive Pin 7
> 4 <-> TTY Receive Negative Pin 6
>  
> Switches:
> 20ma                         DCE
> RX Passive               TX Passive
>  
> I’ve got a nice RS232 Mini-Tester with LEDS to give me a good indication of communication and every combination of Null modem/RS232 Gender changer available, connecting it to a USB->RS2-2 adapter.
>  
> So far I’ve not had any success getting an indication that things are communicating.  Has anyone else used this particular converter with success and can offer any advice?
>  
> Thanks in advance!
> John Toebes
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