帮助我，我正在尝试从PCc汇款到Veriphone签证。万事达卡，但出现错误
SerialPort1.Open()
Dim MyInt As Integer = Val(TextBox1.Text)
Dim b As Byte() = BitConverter.GetBytes(MyInt)
SerialPort1.Write(b,b.Length)
SerialPort1.Close()
错误：
尝试通过Serialport向Verifone发送金额
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问答