Next Advance SP570-M - Manual (Page 39)

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SP500 series OEM Programmable Syringe Pump
NE500 series manual 34 Revision 101101
Pumping Direction Controls (Input: Pin 3; Output: Pin 8): Allows bi-directional control of the
pumping direction. The input pin, when activated, can be used to change the pumping direction. This
function, therefore, is only applicable when the pumping direction change is applicable. The function of
the input pin is configured with the "DIN " command.
When the mode is set to reciprocating pumps (DIN 0), then if the current pumping direction is withdraw, a
falling edge sets the direction to infuse. If the current pumping direction is infuse, a rising edge sets the
direction to withdraw. Otherwise, this input pin has no affect.
When the mode is set to dual pumps (DIN 1), then if the current pumping direction is withdraw, a rising
edge sets the direction to infuse. If the current pumping direction is infuse, a falling edge sets the direction
to withdraw. Otherwise, this input pin has no affect.
Dual and reciprocating pumping systems are created using 2 pumps attached with the accessory cable
CBL-TTL-1.
The output pin provides an output signal to external devices indicating the direction of pumping. A logic
low indicates withdraw, and a logic high indicates infuse. For example, this pin can be used to control an
external valve, allowing the syringe to refill from a reservoir.
9.2 TTL I/O Control from the Pumping Program
Various Pumping Program functions can define how the pump reacts to levels on the TTL I/O connector or
set output levels. These are summarized in the following table:
Pumping
Program
Function TTL I/O Control Pin Pin # Action
FUN OUT Program Output 5 Set logic level output to ‘n’
FUN EVN Event Trigger 4 Low level when executed or a falling edge afterward,
until canceled, causes a jump to Phase ‘nn’
FUN EVS Event Square wave
Trigger 4 Rising or falling edge triggers a jump to Phase 'nn'
FUN IF Program Input 6 Low level causes a jump to Phase ‘nn’
FUN PAS 00 Operational Trigger 2 Trigger activation resumes Program operation
9.3 TTL I/O Control From RS-232
The logic levels of pins 2, 3, 4, and 6 can be queried from an attached computer using the RS-232 ‘IN’
command.
The output logic level of pin 5 can be set with the RS-232 ‘OUT’ command.