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由于这些常数和变量类型很可能与其他控件或系统参数相同，
都在 TYbCustomCommDevice 里面定义的，
可以用 TYbCustomCommDevice::TBaudRate 或者 TYbCommDevice::TBaudRate 来定义。

int                         n = 2;  //COM2
TYbCommDevice::TBaudRate    b = TYbCommDevice::br115200; //115200 bps
TYbCommDevice::TParity      p = TYbCommDevice::ptNoParity; //无奇偶校验
int                         t = 8;  //8 bit 数据
TYbCommDevice::TStopBits    s = TYbCommDevice::sbOneStopBit;
TYbCommDevice::TFlowControl f = TYbCommDevice::fcRtsCts; //采用RTS/CTS数据流控
unsigned char               a = 3;  //电话响3声之后自动应答

YbCommDevice1->PortNo      = n;
YbCommDevice1->Baud        = b;
YbCommDevice1->Parity      = p;
YbCommDevice1->ByteSize    = t;
YbCommDevice1->StopBits    = s;
YbCommDevice1->FlowControl = f;
YbCommDevice1->AutoAnswer  = a;

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