23
333/334 HPLC PUMPS | USER’S GUIDE
ELECTRICAL CONNECTIONS
Input Signals
Four pairs of terminals of the right hand socket are dedicated to specific software-related input
functions:
START / END
PAUSE / RESUME
INPUT (WAIT) (Input # 1)
EMERGENCY (Input #2)
You connect a pair of wires from an output (e.g., relay- type) of the external device, to a pair
of terminals, for each of the functions that you want controlled externally.
Except for WAIT, to activate one of these inputs, you must change the state (close or open) of
an output on the external device.
START/END
An external relay contact, connected to this input, may be used to start (OPEN CLOSE) and
stop (CLOSE OPEN) program.
PAUSE/RESUME
An external relay contact, connected to this input, may be used to pause (OPEN CLOSE) and
resume (OPEN CLOSE) the Method Program currently running. The pause may be configured
with or without flow.
With flow means that pumping continues at the rate and composition that existed at the time
the pause was initiated; when ‘resume’ is signaled the Method Program continues from the
same point.
INPUT (WAIT) (Input # 1)
An external relay contact, connected to this input, may be used to signal to the Method Program
currently running the 333 Pump that the external equipment (e.g., fraction collector, sampling
injector) is ready.
EMERGENCY (Input #2)
Closing an external relay contact, connected to this input, may be used to signal to the pump
software to start a Safety Program file (file 24).
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