KD Scientific Legato 200 Series User Manual
Page 79
79
Appendices
K
D
S
L
e
g
a
to
2
0
0
S
e
ri
e
s
U
s
e
r’s
M
a
n
u
a
l
KD Scientific Legato 200 Series Syringe Pump User’s Manual
Publication 5617-002-Rev F
APPENDIX D: 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
5.
Trigger 2 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
8.
Valve Output (controls voltage only)
TTL Logic Output –
High = Valve Actuated
Low = Valve Off
Note: Valve follows motor direction,
when valve is set to Auto.
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. Pulse duration
should be 0.1s minimum.
User I/O Connector Specifications
phone
508.429.6809
fax
508.893.0160
web
www.kdscientific.com