[GreenKeys] Current Loop to RS-232 Conversion on ASR33

[COURYHOUSE at aol.com]

the  33  should run on low  voltages....l the  15  needs  higher...
 
In a message dated 2/24/2013 2:39:14 P.M. US Mountain Standard Time,  
alf_fisher at tiscali.co.uk writes:

Hi Rob,
I'm sure others will agree but I believe the  ASR33 doesn't actually need a 
high voltage source as there is a transistor  circuit that actually drives 
the electromagnet.  I reckon 20 volts with a  resistor to limit the current 
to 20 mA should work.  
 
Is it possible with the Westermo, to  loop-back the TTY to itself so you 
can print what you type? I don't know what  is in the converter but another 
way may be to bridge the Tx & Rx pins on  the Westermo RS232 port  (pins 2 & 
3?).  It should work the same as being in Local but you are switched to  Line.
 
Alf
 



 
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