Thread: serial port??

Hi:

If I use COM1(hCom1) write data and COM2(hCom2) to receive data, so:

Code:

#define input_Buffer 2 //for hCom2 input buffer
//#define output_Buffer 10

char valRead[20]={0};

SetupComm(hCom2, input_Buffer, output_Buffer)

/* hCom2 only can have only 2 bytes receved at time, right??*/

/*assume that there are 100 bytes already in hCom1 and I use one cable to connect COM1 and COM2 with each other*/

/*now I start reading from COM2*/

ReadFile(hCom2, &valRead, 10, &dwRead, NULL);

the problem now is:

I think there must be only 2 bytes in buffer valRead cause the maximum input buffer in hCom2 is 2 bytes only. But always there are 10 bytes in valRead, Why??? and it still is not working with

dcb.ByteSize= 2;

.
Thanks for help.