Next Advance SP1800 - Manual (Page 28)

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SP1600/1800 Programmable Syringe Pump
Publication #1200-02 23 9/15/04
as nesting of loops, with each loop being one nested layer for the duration of the loops pairing. Loops can
be nested for a total of 3 layers deep. Loops can only be nested within the scope of an outer loop.
8.3.11 Pause Pumping
If ‘nn’ is non-zero, the Pumping Program will pause pumping (stops pumping) for ‘nn’ seconds. When
executed, the display will show
nn
, with ‘nn’ decrementing to indicate the number of seconds
until the next Program Phase is executed. After the pause interval, the next Program Phase will be
executed.
To set a pause time in tenths of seconds, select the decimal point between the digits. To select the decimal
point, press and hold the right-most arrow key until the right-most digit scrolls to 9. After 9, the decimal
point between the 2 digits will toggle on and off . Release the key when the decimal point is
displayed, or cleared, as required. Now enter the required pause time from 0.1 to 9.9 seconds. While
executing a pause time set in tenths of seconds, the display will only show '01' seconds during the pause.
For pauses longer than the ‘99’ second maximum pause for this function, put the pause function within a
Program loop. A Program section with the following functions in consecutive Phases:
[LP:ST] [LP:ST] [PS:60] [LP:60] [LP:24],
will pause the Pumping Program for 24 hours.
If ‘nn’ is ‘00’ then the Pumping Program pauses and waits for a start trigger to resume the Program. The
display will show when waiting for a start trigger.
After the start trigger, the Program will resume with the next Phase. The start trigger can be from any
source, the ‘Start’/’Stop’ key, the TTL I/O Operational Trigger, or from RS-232. Any other key input will
stop and reset the Pumping Program.
If alarms are enabled, the buzzer will beep continuously while waiting for the start trigger.
8.3.12 'IF:nn': Jump to Phase If External Trigger
nn
The ‘IF’ function conditionally alters the Pumping Program’s execution based on an external
signal.
When executed, if the TTL I/O Program Input pin (pin 6) is low level, then the Pumping Program
continues operation with Phase number ‘nn’. Otherwise, the Pumping Program continues operation with
the next Phase.
8.3.13 'Et:nn': Setup Event Trigger Jump Phase
nn
The ‘Event’ function sets a background event trap that is triggered by an external signal.
This one time background trap, or interrupt, stays set during the Pumping Program’s entire execution until
it is triggered, redefined, or reset. This function has no other affect on the operation of the pump until it is
triggered.
The event is triggered when either:
1) A falling edge (high to low TTL transition) occurs on the TTL ‘Event Trigger’ input (pin 4).
2) A low level on the 'Event Trigger' input pin at the time the function is executed.
When triggered, the current operation of the pump and the Pumping Program is interrupted, and the
Pumping Program immediately continues operation (jumps to) with Phase number ‘nn’.
After being triggered, the event trigger is reset. If an event trigger function is executed (either 'Et' or ES'
function) while another event trap is still set, the new event trigger will replace the previous event trap.
Only one event can be defined at any time.