Scan Baudrate Passive

Use Case

The applied baud rate on a real network should be determined on which communication exists. In this case CANoe is a passive participant - receiver - on the network and it is connected about a Y cable to the network.

Syntax

long ScanBaudratePassive( dword channel, dword messageID, double firstBaudrate, double lastBaudrate, dword timeout, dword bAcknowledge);

Function

Baud rate scanner checks different baud rates and tries to receive a message on the channel. Function starts the scan and detects the baud rate on the given channel. Result of the function is written into the Write Window. If a wrong baud rate is present, CANoe cannot receive messages and sends an Error Frame, which can be put on the bus using the parameterbAcknowledge.

Parameters

channel Channel number. (1,..,32)

messageID

ID of the message that the scanner will receive to detect the baud rate. If this value is 0xffff the scanner will receive all the messages on the channel.

firstBaudrate / lastBaudrate

• If both values are set to zero the scanner checks the most commonly used baud rates:33.333, 50.0, 83.333, 100.0, 125.0, 250.0, 500.0, 1000.0 [kBaud]
• If both values are the same but not zero the scanner multiplies the baud rate with a given factor (Value range 0.25-5.0). The factor is changed with steps of 0.25.
• If both values are different, all possible baud rate values in the ranged are scanned.The incremental step in the range is 1.5%.

timeout

Period of time [ms] the scanner waits when the message is sent.

bAcknowledge

Acknowledge modeon (1)/off (0). If a wrong baud rate is present, CANoe cannot receive messages and sends an Error Frame, which can be put on the bus using the parameterbAcknowledge. The parameter serves for the fact that CANoe - as a passive receiver - can participate indirectly in the network communication by sending an Error Frame. The parameter does not change the acknowledge settings of theHardware Configurationdialog. The parameter has an effect only during runtime of the function.

Return Values

Returns 0 if the scan function was successfully started. Otherwise the return value is non-zero.

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ScanBaudrateActive