I am creating a DLL for serial communication using VC6.0. I can achieve communication with baud rates up to 115200 using the CBR_115200 constant in WINBASE.h. I need 230400 but it does not exist and MSDN does not support 230400, it jumps from 115200 to 256000. I have tried adding CBR_230400 to WINBASE.h with no success, can any provide any information for using Microsoft's serial functions (DCB) with 230400 baud rate? Thanks.