Help (communicate With Controller That Use Modbus-rtu)
I HAVE A CONTROLLER THAT USE MODBUS-RTU PROTOCOL,CAN YOU TELL ME WHERE IS MISTAKE ? PLEASE MAIL TO ME (email@example.com). THANKS!
01 03 01 00 00 01 85 F6
Private Sub Command1_Click()
'''' ***I CAN GET THE VALUE FROM THE PROGRAM AS FOLLOWS, WHY????
mscomm1.PortOpen = True
MSComm1.Output = Chr(&H0) & Chr(&H1) & Chr(&H0) & Chr(&H3) & Chr(&H0) & Chr(&H1) & Chr(&H0) & Chr(&H0) & Chr(&H0) & Chr(&H0) & Chr(&H0) & Chr(&H1) & Chr(&H85) & Chr(&HF6)
Label2.Caption = MSComm1.Input
Debug.Print "MSCOMM1.InBufferCount" & N & "="; MSComm1.InBufferCount
Debug.Print "MSCOMM1.INPUT" & N & "="; MSComm1.Input
MSComm1.PortOpen = False
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Does anyone develop this protocol under VB6 or vb5?
Or exist a control to communicate with this protocol?
Thanks for reading. Iam using Modbus for connecting to a Server with a modem, dialing and getting some values from the server. Everything works fine, but in some machines, Modbus server is failing to register so the dialer does'nt work.
I even tried registering it manually
But it fails to register and reports some access violation in Ole32.dll. This happens only in one WindowsNT(I have SP5) and in another Windows98 machine. Rest all machines it works fine.
Any idea about this??
I'm working with an equipament that has an RS232 serial interface with the RTU ModBus protocol. I'm using the MSComm component to talk with the equipament. I need to read something of the equipament but I can't. The read string only contain ????. I can write on the equipament, but not read the answear back.
To write, I send the correctly string with the mscomm.output property.
To read something of the equipament I use the mscomm.input property.
I don't Know if the delay between read each caracter of the answer is wrong.
If someone worked with this protocol or know the answer, please tell me.
Edited by - BarrosAS on 12/10/2003 9:43:07 AM
Has anyone had experience with communicating to devices using the ModBus/TCP protocol?
I am wanting to create my own driver to use with VB to communicate using this protocol.
If anyone has done any of this let me know thanks!!!
If anyone is interested you can find info on this protocol at:
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Private Sub Command1_Click()
GoToLocation(ByVal lX As Long, ByVal lY As Long)
Private Sub Command2_Click()
GoToMarkedLocation(ByRef strWhichMotor As String)
Private Sub Command3_Click()
ResetBoard(ByVal sMicrostepSize As Integer)
Private Sub Command4_Click()
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Private Sub Form_Load()
Private Sub MSComm1_OnComm()
' Buffer to hold input string
Dim Instring As String
Command1.Enabled = False
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' 9600 baud, no parity, 8 data, and 1 stop bit.
MSComm1.Settings = "9600,N,8,1"
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' is used.
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Text1.Text = Buffer$
' Close the serial port.
MSComm1.PortOpen = False
Command1.Enabled = True
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Edited by - TSL1 on 2/2/2007 8:24:12 AM
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