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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 (cts_studio@pchome.com.tw). THANKS!

SLAVE ADDRESS=01
FUNCTION CODE=03
REGISTRY ADDRESS=256
REGISTRY NUMBER=01
CRC=85F6

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)
TimeDelay (500)
Label2.Caption = MSComm1.Input
Debug.Print "MSCOMM1.InBufferCount" & N & "="; MSComm1.InBufferCount
Debug.Print "MSCOMM1.INPUT" & N & "="; MSComm1.Input
Next

MSComm1.PortOpen = False

End Sub




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Hello VBGuys,
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.
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Edited by - BarrosAS on 12/10/2003 9:43:07 AM

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Has anyone had experience with communicating to devices using the ModBus/TCP protocol?
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Hi,

We are doing the project on PLC-DCS interfacing. The main problem in this project is the protocol mismatch. We are using PLC which uses proprietary protocol for serial communication and the DCS we are using is Delta-V which uses MODBUS protocol. So we can't connect them directly. We have to build a protocol converter for MODBUS-proprietary protocol communication. For thi reason we are using computer in between as protocol converter.Uptil now we are able to receive the data on PC from PLC by sending read command through COM1 port of PC.

We have programmed it in VB6.0. Now the remaining part is Modbus slave implementation through COM2 port which we will connect to DCS.

DCS acts as Modbus master and send queries continuously. We want to create holding registers in computer which is MODBUS slave in this communication. The data from PLC should be written at these holding registers.And DCS will read these holding registers by sending Function code 03 to the slave(which we want to implement).

Required holding register addresses are: R40000 to R40100.

The communication parameters are

Baud rate : 9600

Data bits : 8

Parity : none

Stop bit : 1



We will be very much thankful if anybody can help us.



Our contacts:

Vijay:

vijay_mindhe@engineer.com

Satyendra:

satyendra_patil@hotmail.com


Thank you,

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Loop Until InStr(Buffer$, "ok" & vbCrLf)
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Text1.Text = Buffer$
' Close the serial port.
MSComm1.PortOpen = False
Command1.Enabled = True
End Sub

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-Make the motors go home (X=0,Y=0)
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Edited by - TSL1 on 2/2/2007 8:24:12 AM

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