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RS232 Opto Isolator

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bryan

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Hello:

Not having much luck in getting this circuit to work. Pretty sure the problem is the power supplied by DTR and RTS. The two lines are not controlled by the software so they are both at +10, or -10V can't recall as I am writing, but not +10 and -10 as required.

Wanted to try using a split power supply using two 9v batteries, but not sure how they should be connected in the circuit.

Isolated Full-duplex Rs232 Interface

Thanks
 

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