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# CAPLfunctionFDXSetProtocolVersion

# FDXSetProtocolVersion

[Valid for](../../../Shared/FeatureAvailability.md): CANoe DE • CANoe:lite DE • CANoe4SW DE • CANoe4SW:lite DE

## Function Syntax

```plaintext theme={null}
long FDXSetProtocolVersion(long fdxClientHandle, byte majorVersion, byte minorVersion);
```

## Description

This function configures the version of the FDX protocol that should be used for the communication with the specified client.

**Note**\
With each received FDX datagram, CANoe DE product automatically adapts to the protocol version from the received datagram. The function `FDXSetProtocolVersion` is therefore only relevant in the rare case that CANoe DE product should send datagrams to an FDX client without having received a datagram from this client.

## Parameters

* **fdxClientHandle**: FDX client for which the protocol version should be set.
* **majorVersion**: Major version of the FDX protocol
* **minorVersion**: Minor version of the FDX protocol

## Return Values

* **0**: Successful function call
* **-1**: The parameter `fdxClientHandle` is invalid.
* **-2**: The given main version (`majorVersion` parameter) is not supported by CANoe DE product.

## Example

```plaintext theme={null}
// Configure FDX protocol version 1.2 for the given client
FDXSetProtocolVersion(fdxClientHandle, 1, 2);

// Configure FDX protocol version 2.0 for the given client
FDXSetProtocolVersion(fdxClientHandle, 2, 0);
```

See also: [Coupling of two CANoe Instances using the FDX Protocol](../../../CANoeCANalyzer/Interfaces/FDXProtocolCouplingCANoeInstances.md)