Serial communication problem in Arduino Pro Mini

i have arduino pro mini, can not connect device works in stop bit =2.
i changed source program, arduino works in stop bit 1.

i use code:
serial.begin(1200, serial_8n2);  or  serial.begin(1200, 0x0e);

thanks,

post code, , make pencil drawing showing connections , post photo of drawing.

the pro mini uses atmega 328 should able uno can do. have uno, testing?

a link datasheet device want connect useful.

...r

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