Would like your help to clear my doubt and confusion for RS232?(Details for reference:http://www.kynix.com/Parts/3231833/RS232.html)
I don't get a sense that how possible the RS232 signal is converted and transmitted out from the IR tx.
As you look into the photo, the RS232 is direct connect to anode of Zener and the cathode is connected -> IR transmitter anode -> resistor ->gnd. That's all.
If saying that, it translates from "-12 -> -0."6 and "+12 -> +3.3v" (1n3138 assuming) then transmit out, how would it be possible?
I am thinking ,the connect orientation should be Zener place from ground with anode and cathode -> IR transmitter -anode? Am i right? With this orientation only the voltage translator able to work.
Can someone explain further?