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• Wiki Markup
  *Se* \- Pulse Picker mode \[Se\]lect. Refer to Mode List for a complete list of Se modes.

• Sd - Status indicator register. Used for debugging. Refer to Status List for a complete list of statuses.

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  *Sw* \- \[Sw\]eep distance. Number of motor steps to equal 11.25 degrees of motion.

• Sr - Encoder sweep distance. Number of encoder steps to equal 11.25 degrees of motion.

• Wiki Markup
  *Dr* \- Encoder \[Dr\]ift, or the difference between the encoder count the predicted encoder position.

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  *Dl* \- Encoder \[D\]rift \[L\]imit, Ud or Ld flags will be raised if encoder drift \[Dr\] exceeds this limit. This can be changed by the user, but is reset to 2346 encoder ticks (4 motor steps, roughly 1 0.5degdegree) if the motor is power-cycled.

• P0 - Center (open) position, in motor steps.
• P1 - Positive closed position, in motor steps, nominally P0+Sw. (Repurposed from standard MCode program.)
• P2 - Negative closed position, in motor steps, nominally P0-Sw.
• N0 - Center (open) position, in encoder counts.
• N1 - Positive closed position, in encoder counts, nominally N0+Sr.
• N2 - Negative closed position, in encoder counts, nominally N0-Sr.
• Ec - Error checking flag. (0=OFF, 1=ON)
• Ns - Pulse Picker MCode version. (Repurposed from standard MCode program.)
• Hb - Heartbeat counter, incremented approx. every 100ms.
• Cs - Encoder counter shadow register (=C2)
• Ud - Drift violation counter, incremented at each + drift violation. Cleared upon homing the motor.
• Ld - Drift violation counter, incremented at each - drift violation. Cleared upon homing the motor.
• Df - Motor position flag (see interpretation below)
• Mo - Experimentally-determined magic offset, in motor steps, that is the distance between the negative side of the homing index mark and P1. This number will be negative so that it feeds directly into an MR command. This has no initializer and depends on being correctly set by the engineer!

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