Page History

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• Signal state change to 50 (Fast close init)
• Load fast close speeds (CL V5)
• If neither at Df=1 (positive closed) nor at Df=-1 (negative closed), then
  • Move (MA) to the positive closed position (P1)
  • Hold until movement complete
  • Copy current encoder count to Cs for future drift checks
  • Set Df=1 to indicate that slits are in positive closed position
• EndIf
• Signal state change to 51 (Fast close complete)
• Goto mode select

Mode 6: Follower (LB Z6)

• Signal state change to 60 (Follower Mode Init)
• Load Follower speeds (V6)
• Move the shutter to the nearest closed position (CL X5)
• Set hi-speed trip input to trigger on HIGH-going edge
• Specify Follower Open ISR (J7) to run on Input Trip
• Arm Input Trip (TE=4)
• Signal state change to 61 (Follower Loop)
• Burst Loop START (forever):
  • Increment heartbeat
  • Hold for 100ms
  • If user sets the soft reset (Se=0)
    • Branch to Mode Select (Mode 0)
  • EndIf
  • If user requests fast close (Se=5)
    • Branch to Fast Close (Mode 5)
  • EndIf
• Burst Loop END

NOTE: Once you enter follower mode, you should cycle the EVR line (high-low-high or low-high-low) at least once to synchronize the shutter and the input. This limitation will be fixed in a later picker hardware revision.

NOTE: Once in the follower loop, you must set Se=0 to get back to Mode Select. Follower mode is continuous, that is, each subsequent trigger pulse will open and close the shutter.

Follower Open ISR (LB J7)

• Move (MA) to open position (P0)
• If error checking is enabled (Ec=1) AND last position was P1 (Df==1)
  • Calculate drift at previous position P1: Dr=N1-Cs
  • If calculated drift is out of spec (Dr>=Dl)
    • Increment lower drift violation counter Ld
  • EndIf
• EndIf
• Specify Follower Close ISR (J8) to run on Input Trip
• Hold until movement complete
• Copy current encoder count (C2) to shadow register Cs
• Set Df=0 to indicate slits are at open position
• Set high-speed trip input to trigger on LOW-going edge
• Re-arm input trip (TE=4)
• Return

Follower Close ISR (LB J8)

• Move (MA) to positive closed position (P1)
• If error checking is enabled (Ec=1)
  • Calculate drift at previous position P0: Dr=Cs-N0
  • If calculated drift is out of spec (Dr>=Dl)
    • Increment upper drift violation counter Ud
  • EndIf
• EndIf
• Specify Follower Open ISR (J7) to run on Input Trip
• Hold until movement complete
• Copy current encoder count (C2) to shadow register Cs
• Set Df=1 to indicate slits are at positive closed position
• Set high-speed trip input to trigger on HIGH-going edge
• Re-arm input trip (TE=4)
• Return

Mode 7: Home to Index Mark (LB Z7)

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