Regarding Higher Baudrate setting xPC target RS232 (obsolete) configuration block

Hello, I am using the xPC target RS232 binary receive block to log some data on the target machine which is connected to a sensor. The sensor can send data upto 921600 baud rate. Now the maximum limit of baudrate on my RS232 Mainboard setup block is 115200. Is there anyway to increase this to 921600? I tried using set_param(gcs,baudrate,'..') but it did not work.