KD Scientific Gemini 88 - Manual (Page 28)

26
KDS Gemini 88
PUMP CHAIN
Pump Port 1: Computer control side
Pump Port 2: Connection for remainder
of pump chain
Baud Rate: 300, 1200, 2400 or
9600
Word Size: 8
Parity: none
Stop Bits: 2
TTL Connections are via a 9 pin D-sub type connector. All inputs are internally pulled up to a
logic high. All user definable pins are controlled via the IN and OUT pump chain commands.
See Pump Chain Commands.
Pin Assignments
1) Vss (Ground reference, logic low)
2) Directional Indicator:
Low – Syring 1 Infusing
High – Syringe 1 Refilling
3) Pump Running Indicator
Low - Pumped Stopped
High - Pump Running
4) User Definable Output
5) User Definable Output
6) Foot Switch Input Falling edge
starts/stops pump
7) Timer Input
Rising edge starts pump
Falling edge stops pump
8) Directional control input
Rising edge sets Syringe 1 to infuse
Falling edge sets Syringe 1 to refill
9) Vcc (Logic High Reference)
Figure 10. TTL Connector Specifications
Figure 9. RS-232 Specifications
Logic Low: 0 V – 0.5 V
Max. 2 mA current sink
Logic High: 2 V – 5 V
Max. 400 mA current source
Appendix D: RS-232 Specifications
Appendix E: TTL Connector Specs