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

[Michael]

Actually John, you may be right about 20 mA for the model 33. I have mine modified to give 40 mA now to connect to the iTelex system. The model 32, I think is 60 ma. You won't see anything happening until the RS232 port is talking.


Mike



-----Original Message-----
From: john <john at toebes.com>
To: greenkeys <greenkeys at mailman.qth.net>
Sent: Fri, Oct 19, 2018 5:47 pm
Subject: Re: [GreenKeys] Does anyone have any experience using the L-Com RS232 to Current Loop Converter with a Mod 33 Teletype?



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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