User guide

22
Appendices
KDS Legato 950 OEM Series User’s Manual
KD Scientific Legato 950 OEM Series Syringe Pump User’s Manual
Publication 5617-012 Rev A
APPENDIX C: EXTERNAL CONNECTIONS
User I/O Connector Specifications
Pin Assignments
1. Direction control input
Rising edge sets pump to infuse
Falling edge sets pump to refill
2. Trigger Input
Event trigger – falling edge triggers a program event
3. Footswitch Input (or Timer)
Settable to work as:
-Momentary switch closure to ground or TTL Logic
Low; falling edge toggles between states (run/stop)
-Starts on rising edge, stops on falling edge
-Starts on falling edge, stops on rising edge
4. Trigger 1 Output
TTL Logic Output-Default = Low Control thru program
or serial comm
6. Sync Output
TTL Logic Output –
Rising Edge = Start Infuse
Falling Edge= Start Refill
7. Direction Output
TTL Logic Output –
High = Refill
Low = Infuse
9-13. Signal Return / Ground
14. Run Indicator Voltage
+5V through a 470 ohm resistor (connect to LED
Anode)
15. Run Indicator Output
TTL Logic Output, active low (low = run) (connect to
LED Cathode)
Electrical Specifications
Inputs: VIH ≥ 2V IIH ≤ 20µA
VIL ≤ 0.4V IIL ≤ 0.5mA
Outputs: VOH ≥ 3.8V IOH ≤ 6mA
VOL ≤ 0.4V IOL ≤ 6mA
All Inputs are pulled high to +5 Vdc through a 10k
resistor All Outputs are at TTL Logic Levels. Pulse duration
s
hould be 0.1s minimum.
User I/O Connector Specifications
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