T-Series/Commands/Set Current Position

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[edit] Set Current Position - Cmd 45

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Instruction Name	Set Current Position
Firmware Version	5.00 and up
Command Number	45
Command Type	Setting
Command Data	New Position
Reply Data	New Position
Persistence	Volatile
Summary	Sets the the internal register that holds the position to the value specified in the command data.

The phase of the stepper motor is controlled by the least significant byte of the position, thus the device may move by +/- 2 full steps unless the new position corresponds to the true current position of the device. This command is useful if you want to turn off the system without losing position. Simply save the position in the controlling computer and turn off the hold current before powering down. After powering up, set the position back to the saved value and turn on the hold current. In this way you can continue without having to home the device. You have to turn off the hold current because when the power first comes on the position will default to the maximum range, and that may be out of phase with the motor's current position. If the hold current is on, it will force the motor into phase with the default position before you've had a chance to restore the current position.

The position data is volatile and will not persist after power-down or reset.