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SN65C3232E: RS-232 serial port continuously protected against overvoltage

Part Number: SN65C3232E

Hi Ti support team,

I use SN65C3232E to support RS-232 line (Tx and Rx only),
The project requirements need to support output short circuit testing.
The test conditions are as follows,
1. RS-232 output will connect to 35V or ground
2. RS-232 input will connect to 35V or -1V
All I need to consider is the condition that the input and output should be connected to 35V for a long time (up to 1-2 hours not transient during this test). 

I believe this can be supported by some protection components, such as Zener Diodes.
Can you provide me with relevant suggestions based on the output characteristics of SN65C3232E?

Thanks,

Andy