configure serial port to 230400 baud rate

When I try to configure my serial port to 230400 I get an error code "E

rror -1073807330 occurred at Property Node (arg 2) in VISA Configure Serial

Port (Instr).vi

Possible reason(s):

VISA: (Hex 0xBFFF001E) The specified state of the attribute is not val

id, or is not supported as defined by the resource.--VISA: (Hex 0xBFF

F001E) The specified state of the attribute is not valid, or is not supporte

d as defined by the resourc

e."

Is it not possible to set up my port to that speed?

http://labview.itags.org/q_labview_6393.html