User`s guide

APPENDIX E: EXTERNAL CONNECTIONS
User I/O Connector Specifications
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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
Momentary switch closure to
ground or TTL Logic Low;
falling edge toggles between states
(run/stop)
4. Trigger 1 Output
TTL Logic Output-Default = Low
Control thru method or serial comm
5. Trigger 2 Output
TTL Logic Output-Default = Low
Control thru method or serial comm
6. Sync Output
TTL Logic Output –
Rising Edge = Start Infuse
Falling Edge= Start Refill
7. Direction Output
TTL Logic Output –
High = Infuse
Low = Refill
8. Valve Output
TTL Logic Output –
High = Valve Actuated
Low = Valve Off
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: V
IH
≥ 2V I
IH
≤ 20µA
V
IL
≤ 0.4V I
IL
≤ 0.5mA
Outputs: V
OH
≥ 3.8V I
OH
≤ 6mA
V
OL
≤ 0.4V I
OL
≤ 6mA
All Inputs are pulled high to +5 Vdc through a 10k resistor
All Outputs are at TTL Logic Levels
Figure 86: User I/O Connector Specifications
Trigger 1 Out
Trigger 2 Out
Sync Out
D
irection Out
Valve Out
Footswitch In
Event In
Direction In
Run Indicator
Run Indicator or Voltage
Publication 5419-002-Rev-A
103
A
ppendices
Harvard Apparatus PHD Ultra Syringe Pump Series User's Manual