Varian ProStar 325 UV-Vis, Service Manual

Page: 55 / 149

ProStar325 Service Manual
Publication date 8 May 2003
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Figure 4 Input/Output Schematics
Enable Out:
A non-polarized constantly active output (a short). This output can be
used to activate Enable In on the next instrument.
Ready In:
When Enable In is set (software switch) this polarized input signal
must be present before the ProStar 325 can go to the READY state.
Specifically, when the ProStar 325 is in the NOT READY Lamp On
state, on receiving a Ready In signal, a monitor period will occur
after which the detector goes to the READY state. It must stay active
until the ProStar 325 starts. Ready In will be ignored in all other
states.
Ready Out:
This polarized output signal indicates that the ProStar 325 is in the
READY state and is ready to start a time program.
Start In:
This polarized edge triggered input signal will start the active
method if the ProStar 325 is in the READY state.
Start Out:
This polarized output signal will be activated for 600 milliseconds
when the ProStar 325 starts a time program.
Fault In:
This polarized edge triggered input signal informs the ProStar 325
that a fault condition exists in another instrument in the system. The
ProStar 325 halts the time program and sends a Fault Out signal.
The source lamp can be programmed to either remain on or turn off
upon receiving a fault signal.
Fault Out:
This polarized output signal will activate for 600 milliseconds when
either of the following conditions occurs:
1. The ProStar 325 discovers an internal fault condition that
warrants aborting the run.
2. The ProStar 325 receives a Fault In signal and it has no internal
fault condition itself.
Autozero:
This edge-triggered contact closure causes an autozero adjustment.
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