NXC  Version 1.2.1 r5
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char NXTLineLeaderPowerDown ( const byte &  port,
const byte &  i2caddr 

Powerdown NXTLineLeader device.

Put the NXTLineLeader to sleep so that it does not consume power when it is not required. The device wakes up on its own when any I2C communication happens or you can specifically wake it up by using the NXTLineLeaderPowerUp command. The port must be configured as a Lowspeed port before using this function.

portThe sensor port. See NBC Input port constants.
i2caddrThe sensor I2C address. See sensor documentation for this value.
A status code indicating whether the operation completed successfully or not. See CommLSCheckStatusType for possible Result values.