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• Move to positive closed position P1
• If error checking is enabled (Ec=1)
  • Calculate drift at previous position P2: Dr=Cs-N2
  • If drift is at or beyond limit (Dr>=Dl)
    • Increment the upper drift violation counter Ud
  • EndIf
• EndIf
• Set Flip-Flop ISR 1 (J5) to run on next Input Trip
• Hold until movement is complete
• Copy current encoder count (C2) to shadow register Cs
• Set Df=1 to signal at positive closed position
• Re-arm Input Trip (TE=4)
• Return

Mode 3: Burst (LB Z3)

• Signal state change to 30 (Burst Mode Init)
• Load Burst speeds (V3)
• Move the shutter to the nearest closed position (CL X5)
• Specify Burst Open ISR (J3) to run on Input Trip
• Arm Input Trip (TE=TE|4)
• Signal state change to 31 (Burst Loop)
• Burst Loop START (forever):
  • Increment heartbeat
  • Hold for 100ms
  • If user sets the soft reset (Se=0)
    • Branch to Fast Close (Mode 5)
  • EndIf
• Burst Loop END

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

Burst Open ISR (

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LB J3)

• Move (MA) to open position (P0)
• If error checking is enabled (Ec=1) , check AND last position was P1 (Df==1)
  • Calculate drift at previous
  , assumed positive closed position (call X8)
• Hold until movement complete
• • position P1: Dr=N1-Cs
  • If calculated drift is out of spec (Dr>=Dl)
    • Increment lower drift violation counter Ld
  • EndIf
• EndIf
• Specify Burst Close ISR (J4) 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
• Signal state change to 94 (Move to open position complete)
• Specify Burst Close ISR (J4) to run on Input Trip
• Re-arm input trip (TE=TE|4)
• Return

Burst Close ISR (LB J4)

• Signal state change to 33 (Burst close signal received)
• Move (MA) to positive closed position (P1)
• If error checking is enabled (Ec=1), check drift at previous, assumed negative closed position (call X9) (this is redundant here)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 Burst Open ISR (J3) to run on Input Trip
• Hold until movement complete
• Set Df=1 to indicate slits are at positive closed position
• Copy current encoder count (C2) to shadow register Cs
• Signal state change to 91 (Move to Set Df=1 to indicate slits are at positive closed position complete)
• Specify Burst Open ISR (J3) to run on Input Trip
• Re-arm input trip (TE=TE|4)
• Return

Mode 4: Fast Open

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