Has anyone been able to buy or make a TTL to RS-232 converter? 
I purchased a ST232 chip and some .1 uF capacitors and tried to create one, but it's not working.  the places where the voltage is supposed to be doupbled pin 2 +10 Volts and pin 6 -10 Volts its reading +/- 3.2 volts.
"In the beginner's mind there are many possibilities. In the expert's mind there are few."
-Shunryu Suzuki