A-2 Optically Isolated Output Circuit Sketch - Agilent Technologies VS Series Operation Manual

VS Series Helium Mass Spectrometer Leak Detectors
Pin
No. Signal Name
24 RDSTDLK_
IN
25 PARALLEL_
ENABLE_IN
Figure A-2 shows the output circuit sketch. Level outputs are optically isolated emitter
followers with 10 Ohm series resistors, and a 14 mA max drive current (24 VDC max).
Figure A-2 Optically Isolated Output Circuit Sketch
Table A-6 I/O Connector Pin Signals (Continued)
I/O Signal
I Level Active HIGH when standard
leak is ON.
I Level Active HIGH when ENABLE
is active.
Description Leak Detector Behavior
Initiate the INTERNAL
STANDARD LEAK reading
routine.
Activation causes the leak
detector to take inputs only
from the rear panel I/O or
RS-232 port. No control
functions (inputs) from the
front panel or wireless are
allowed.
A-17