NXC  Version 1.2.1 r5
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#define BlockTachoCountField   13

NXT-G block tachometer count field.

Contains the current NXT-G block tachometer count. Read only. Return the block-relative position counter value for the specified port. Refer to the UpdateFlagsField description for information about how to use block-relative position counts. Set the UF_UPDATE_RESET_BLOCK_COUNT flag in UpdateFlagsField to request that the firmware reset the BlockTachoCountField. The sign of BlockTachoCountField indicates the direction of rotation. Positive values indicate forward rotation and negative values indicate reverse rotation. Forward and reverse depend on the orientation of the motor.