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Appendix D: PHD 2000 to PC Connection
Harvard Apparatus PHD 2000 Syringe Pump Series User's Manual
49
Figure 13. PHD 2000 to PC Connection
Appendix E: TTL Connector Specs
TTL Connections are via a 9 pin
D-sub type connector. All inputs
are internally pulled up to a logic
high.
Pin Assignments
1. Vss (Ground Reference,
logic low)
Falling edge starts/stops
pump
2. Valve Control Output:
Low – Infusing
High – Refilling
3. Running Output Indicator
Low - Pumped stopped
High - Pump running
4.
5.
6.
7.
Figure 15. TTL Connector Specifications
Programmable Output
Logic High Reference (5V, 400 µA)
Foot Switch Input
Timer Input
Rising edge starts pump
Falling edge stops pump
8. Directional Control Input
Rising edge sets pump to infuse
Falling edge sets pump to refill
9. Event Input
Falling edge triggers program
event
Logic Low:
0 V – 0.5 V
Max. 2 mA current sink
Logic High: 2 V – 5 V
Max. 400 µA current source