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Technical Information
I/O Connector
The following table lists the optional discrete I/O PCB (P/N# R2111501) pin signals.
This I/O connector provides a means for a controller, usually a PLC, to control or to
determine the leak detector status. The I/O is accessible via a type DB25S (female
socket) connector.
Table 28 I/O Connector Pin Signals
Pin
Signal
No.
Name
15,
+ VIN
19,
23
17,
VRET
21
1
CAL_OUT
2
ZERO_OU
T
3
HOLD_OU
T
4
VENT_OU
T
5
START_O
UT
6
READY_
OUT
7
TEST_OU
T
8
REJECT1_
OUT
158
I/O
Signal
Description
N/A
+5 V to
Customer-supplied +5VDC to
+24
+24VDC for Output Common pins.
VDC
N/A
0 VDC
Customer -supplied GND for the
Input Common pins.
O
Level
Active HIGH when the leak
detector is in CALIBRATION
mode.
O
Level
Active HIGH when the leak
detector is in ZEROING mode.
O
Level
Active HIGH when the leak
detector is in HOLD mode.
O
Level
Active HIGH when the leak
detector is VENT mode.
O
Level
Active HIGH when the leak
detector is in START/ROUGH
mode.
O
Level
Active HIGH when the leak
detector is in READY mode.
O
Level
Active HIGH when the leak
detector is in Test and
Fine Test modes.
O
Level
Active HIGH when the leak rate is
over set point #1.
Leak Detector Behavior
Performs calibrating routine with
the Internal Calibrated Leak;
Zeroing routine is included.
Performs the Zeroing routine.
Performs a HOLD routine and
isolates the test port and any
test objects from the leak
detector vacuum system.
Performs a VENT routine,
isolates the test port from the
leak detector vacuum system
and vents the test port to
atmosphere.
Performs a ROUGHING
routine on the test port and
any attached test objects.
Indicates that the leak
detector is completing a
STARTING routine and that
the filament and turbo are OK.
Indicates that the leak
detector is ready for fine leak
testing.
Indicates that the value of the
leak rate exceeds the value set
in the 1REJECT variable.
Agilent Helium Leak Detector User Manual
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