FBusIO_SendMsg Method

Description
Sends an explicit message to a Fieldbus device and returns the reply.

Syntax
Sub FBusIO_SendMsg (BusNumber As Integer, DeviceID As Integer, MsgParam As Integer, SendData As Byte(), ByRef RecvData As Byte())

Parameters

• BusNumber
  An integer indicating the Fieldbus system number. This number must be 16, which is the ID of the bus connected to the Fieldbus master board on the PC side of the controller.
• DeviceID
  An integer indicating the Fieldbus ID of the device.
• MsgParam
  An integer expression indicating the message parameter. This is not available for DeviceNet.
• SendData
  Specifies the data to send to the device as a byte array. This array must be dimensioned to the number of bytes to send. If there are no bytes to send, specify 0.
• RecvData
  Specifies the data to receive from the device as a byte array. This array will automatically be redimensioned to the number of bytes received.

Remarks
Note
This method will only work if the Fieldbus Master option is active.

See Also
FBusIO_GetBusStatus Method, FBusIO_GetDeviceStatus Method, IsOptionActive Method

FBusIO_SendMsg Use Example
VB Examples:

'Send explicit message to DeviceNet device  
Dim recvData() as Byte  
Dim sendData(6) as Byte  
Array.Clear(sendData, 0, sendData.Length)  
sendData(0) = 14 'Command  
sendData(1) = 1 'Class  
sendData(3) = 1 'Instance  
sendData(5) = 7 'Attribute  
' MsgParam is 0 for DeviceNet  
m_spel.FbusIO_SendMsg(16, 1, 0, sendData, recvData)  
  
' Send explicit message to Profibus device  
Dim recvData() As Byte;  
m_spel.FbusIO_SendMsg(16, 1, 56, Nothing, recvData);  

C# Example:

// Send explicit message to DeviceNet device  
byte[] sendData, recvData;  
byte[] sendData = new byte[6];  
Array.Clear(sendData, 0, sendData.Length);  
sendData[0] = 14; //Command  
sendData[1] = 1; //Class  
sendData[3] = 1; //Instance  
sendData[5] = 7; //Attribute  
//MsgParam is 0 for DeviceNet  
m_spel.FbusIO_SendMsg(16, 201, 0, sendData, out recvData);   
  
// Send explicit message to Profibus device  
byte[] recvData;  
m_spel.FbusIO_SendMsg(16, 1, 56, null, out recvData);