如何在不按下梅特勒托利多秤上的按钮的情况下打印重量

How to print weight without pressing the button on Mettler Toledo scales

这是我按下秤上的按钮时的代码:

Private Sub SerialPort1_DataReceived(sender As Object, e As SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived
    If comOpen Then
        Try
            readBuffer = SerialPort1.ReadExisting()
            Me.Invoke(New EventHandler(AddressOf DoUpdate))
        Catch ex As Exception
            MsgBox("read " & ex.Message)
        End Try
    End If
End Sub

Public Sub DoUpdate(ByVal sender As Object, ByVal e As System.EventArgs)
    TxtIn.AppendText(readBuffer)
End Sub

我的体重秤是 Metller Toledo AB204-S

终于发现卡住了

Private Sub BtnSend_Click(sender As Object, e As EventArgs) Handles BtnSend.Click
    SerialPort1.WriteLine("SI" & vbCrLf)
End Sub

这是代码命令 SI 和 CrLf