Citect Cicode PC COM Communication

i'm a beginner with Citect and Cicode.
i want to send some data to pc com1 port.
i want to use ComOpen and ComWrite functions in cicode.
but when i run my project, the defined com port will be opened and ComOpen function return -1 value.
i will appreciate you help.

this my cicode code:

FUNCTION OpenPort()

INT hPort;
STRING sPort;
STRING Send;

sPort = "PORT1_BOARD1"
hPort = ComOpen (sPort,1);
mmes = hPort;

IF hPort >= 0 THEN

Send = "somedata";
SendLength = StrLength(Send);
ComWrite(hPort,Send,SendLength,2);

ELSE
Prompt("Not Open");
Message ("Info","Port NOT Opend.", 0);
END
END