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Continuous overvoltage protection for RS232 converter- URGEN

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sizzler

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rs232 overvoltage

hi,

I want to provide a +28V continuos overvoltage protection on RS232 TXout and RXin pins. The ADM3202 has +/-30V absolute maximum rating on RX pin but on TX out its only +/-15V. I'v put a PSD18C TVS on TX pin for ESD/EFT/Surge. A series reistor of 4.7OHM/ 1W resistor is also series with the TX and RX pins.
so the tx pin is not protected against 28V continuos. any suggestions pls help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Sizzler
 

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