1-10 Overview
Chart (+, –) 10-mV full scale output – Plots output, which represents pump
percentage composition (%A through %D) or flow rate, to a recording device
you specify as a Chart OUT parameter on the SETUP screen.
Tip: Because of the delay associated with system volume,“Pump percentage
composition” refers to solvent composition at the proportioning valve and not
the column or detector.
Pressure (+, –) 10-mV full scale output – Directs pressure trace output
from the pump transducer (0 to 4000 psi).
Connector types
The rear panel terminal strip contains these signal connections:
Open Collector (S1, S2, S3, S4) – Output signals that control inputs
requiring contact closures, TTL-level signals, or open collector outputs. They
also trigger solenoid valves and other power devices that require current up to
1-A current. You can program the controller to turn these signals on and off or
produce a 0.2-second pulse.
Digital Output (Hold) – Useful for signaling the logic inputs of other
devices. It is compatible with TTL inputs or inputs expecting contact closures.
If the controlled input is polarized, connect the grounds together and the input
terminal to the Hold output.
Analog Output (Press +/–, Chart +/–) – Special output produces a DC
voltage whose magnitude is proportional to the physical parameter monitored.
The outputs’ full scale voltage range 10 mV. The Press terminals present only
a voltage representation of the current system backpressure. The Chart
terminals are configured through the controller to produce a voltage
proportional to the composition of solvent reservoir A, B, C, or D, or to the
current flow rate.
Digital Input (INJ, Stop Flow) – Driven by several outputs, including TTL
signals, open collector outputs, or contact closures. If the outputs driving these
inputs are polarized, connect the ground terminals together and the signal
terminals together.
Tip: Stack multiple instruments (see the figure “Stacked IEEE-488 connections
in a Waters workstation” on page 2-16) or connect them in series. Thus you
might connect the 7725i injector, a Waters non-PowerLine autoinjector, and a
Waters 746 integrator.
Tip: An autoinjector connected to this terminal starts the run. (Waters
autoinjectors start the run through PowerLine control.) The time required to
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