Nova-Tech LMI Series HH Metering Pump - Manual (Page 40)

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Appendix A: Input/Output Description
4-Pin Connector
Pacing (Pulse) Input / Opto-Isolated Input (HH7 and HH9 Only)
Methods of Triggering Pump.
Reference: 4-Pin Cable (P/N 33796) (HH9 Only)
4-Pin Cable (P/N 28368) (HH7 Only)
Pin 1
Pin 2 Black
Black
Black
Black
White
White
White
White
Pin 1
Pin 2
+
-
Pin 1
Pin 2
+
-
Pin 1
Pin 2
+
-
NPN Transistor
Switch
PNP Transistor
Opto Isolator
HH9 Only
Switch or transistor must be capable of switching 2mA at
15 VDC. When in the Divide mode, the switch must close then
open to trigger.
Minimum time in low impedance state (i.e. switch closed) is
60 mSec. by default.
Setup Menu Item 6 sets this value in multiples of 4mSec.
Example: Default = 4 X 15 = 60 mSec
Appendix A