Maximum serial baud rate for RCM 3220

Hey Folks,

I recently tried to connect a Hokuyo URG04LX Laser Range Finder with the serial port B on a RCM 3220 board.
The maximum baudrate which was possible to set up was 115,200 bps. Shouldn’t it be possible to achieve at least 250,000 bps (The RCM 3200 manual refers to a theoretical maximum baudrate of 276,250 bps for a 44.2 MHz clock speed)??
Does anyone know how I can make the RCM 3220 to establish a baudrate of 250,000 bps??

Thank you very much in advance…