I'm looking for Serial Board supports baudrate 691200 bps

[gnataly]

How to define the custom specified 691200 bps baud rate to Serial Board.

(I'm working with VC++)

[K C]

The PCI and PCIe 84xx boards support all baudrates from 57 till 1MBaud.

You can also use FTDI devices. They also support 'any' baudrate.

Kees