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VS Series Helium Mass Spectrometer Leak Detectors
A.3 Customer Accessible Inputs and Outputs
A.3.1 Serial Connector
Use the SERIAL connector on the Rear Panel to interface the VS Series leak detector to a PC
via an isolated RS-232 connection. Table A-5 and Figure A-1 provide details of the
connection. A typical connection from a 9-pin PC serial connector requires a
female-to-female, 9-pin, null modem cable, where pins 2 and 3 are crossed.
Pin
2
3
5
A.3.2 I/O Connector
Table A-6 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.
Pin
No.
Signal Name
15,
+ VIN
19,
23
17,
VRET
21
1
CAL_OUT
A-14
Table A-5 Serial Connector Summary
EIA Name
Received Data
Transmit Data
Signal Common
Figure A-1 Serial Connector Map
Table A-6 I/O Connector Pin Signals
I/O
Signal
N/A
+5 V to
Customer-supplied +5VDC
+24
to + 24VDC for Output
VDC
Common pins.
N/A
0 VDC
Customer -supplied GND for
the Input Common pins.
O
Level
Active HIGH when the leak
detector is in CALIBRATION
mode.
Data into the leak detector
Data out of the leak detector
RS-232 Ground
2 3
5
Description
Description
Leak Detector Behavior
Performs calibrating routine
with the Internal Calibrated
Leak; Zeroing routine is
included.
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