PXT_External digital input
| Item | Common to all models |
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| Fixed input points | 1 point (Polarity switchable) |
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| Selected input points | 5 points (Polarity switchable) |
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| Input form | Photocoupler isolated input (Applicable to both current sink / source output) |
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| Fixed function | ALARM IN | HIGH alarm occurrence |
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| Selecting function | OFF | Do not use terminals |
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| OUTPUT ON | Turn on the output |
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| OUTPUT OFF | Turn off the output |
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| OUTPUT CTRL | Turn on of off the output |
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| L ALARM IN | LOW alarm occurrence |
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| ALARM CLR | LOW alarm clearance |
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| SEQ RUN | Sequence start/end |
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| SEQ PAUSE | Sequence pause/resume |
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| SEQ TRIG IN | Input the trigger for sequence |
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| ACQUIRE TRIG | Input the measurement trigger |
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| MEM1 RECALL | Recall preset memory 1 |
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| MEM2 RECALL | Recall preset memory 2 |
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| INTEG CTRL | Starting/stopping integration measurement |
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| INTEG RESET | Resetting integration measurement data |
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| External circuit power supply range | 12 V to 24 Vdc (±10 %) |
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