CRC Check Failed Exception

[speed]

I am using the identical code, except for the com port, on 2 different windows machines. one is a laptop running windows 8.1, the other a virtual machine running windows 7. the code runs great on the windows 8.1 machine, but i get EasyModbus.Exceptions.CRCCheckFailedException when i run it on the windows 7 machine. i have changed the code to vb.net, but that is the same on both machines. i can run other programs in python or vb6 on the win 7 machine and they run fine. does anyone know what might be causing this?

[Rossmann Engineering]

Can you send me your Code, and a Screenshot showing the Values you are trying to send?

[Anonymous]

I'm interested in the result of this, because I might have similar experience: A lot CRC errors with a Win7 machine but on the scope the data looks fine and with other tools (like ModbusPoll) I don't get any errors.

[Anonymous]

I recently was encountering a similar problem while using an RS232 to RS485 adapter. Sporatic CRC check failures would occur during long tests due to a leading zero value. I suggest re-assigning COM1 to another COM port as Windows 7 32-bit uses COM1 as a debug port for some reason (Windows 7 64-bit does not). You can also enable the FIFO buffers and move the sliders up to the maximum. Lastly, make sure you're running EasyModbus 2.9 or newer as I think there may have been an issue in version 2.8. These steps seemed to fix it for me.

[Anonymous]

Hello ;
I have similar problem

Dim mdBusclient As ModbusClient
Dim BB As Boolean()

   Private Sub ToolStripButton2_Click(sender As Object, e As EventArgs) Handles ToolStripButton2.Click

    MesajKutusu.Items.Add("Sinyal gönder")
    'FTChipID.ChipID.GetNumDevices()
    Try
        mdBusclient = New ModbusClient("COM4")
        mdBusclient.Connect()
        MesajKutusu.Items.Add("Bağlantı yapıldı başarılı")
    Catch
        MesajKutusu.Items.Add("Bağlantı yapılamadı")
        Throw

        End

    End Try
    BB = {True, False, False}
    MesajKutusu.Items.Add("Açılışa geldi")
    mdBusclient.WriteMultipleCoils(1, BB)



End Sub


MultipleCoils returns with CRC Failure
Any ideas?