软件、驱动及源代码，一套完整的USB控制继电器板解决方案

usb控制继电器板软件+驱动+源代码 Public Function tx_read_frame(leixing As Byte, data1 As Byte, data2 As Byte, data3 As Byte, data4 As Byte) Static Byteout(0 To 7) As Byte, i As Byte '向外发送 Dim sum As Integer Byteout(0) = &H55; Byteout(1) = 1 Byteout(2) = leixing Byteout(3) = data1 Byteout(4) = data2 Byteout(5) = data3 Byteout(6) = data4 sum = 0 For i = 0 To 6 Step 1 sum = sum + Byteout(i) Next Byteout(7) = sum Mod 256 main_form.MSComm1.InBufferCount = 0 main_form.MSComm1.Output = Byteout End Function