Android how to use rs232 port to receive rs485 data?

My android device has a RS232 port,
and I have a keyboard with the rs232 port,
so I use the “android-serialport-api”,
create an app to receive the keyboard typein, and success.

another keyboard use rs485,
so i use a rs232 to rs485 adapter to convert it.
but the careated app can’t get any input data anymore.

Why…? should I create new app for it?
Have any way can solve this problem?

Source: android

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