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RS422 Drivers for MCB2130 board

Dear Sir,

i have a KEIL board MCB2130 and would like to connect it with a sensor. The sensor has a RS422 interface which is factory configured to 115200 Baud and as an 8-bit UART with one start bit, eight data bits, and one stop bit.

i tried to communicate to the sensor to read the data but unfortunately i could not get it. it looks like that some API is missed. is anybody can supply me with RS422 support for my board or gives some advices?

Regards
Isaac