A-1
Model 979 Series Helium Mass Spectrometer Leak Detector
DRAFT 9/15/03
Appendix A. Rear Panel Interface Connectors
The system control and communication panel (Figure A-1) is located on the lower left
section of the rear panel. This appendix discusses the I/O
➀
and the Remote Control
➁
interfaces.
Figure A-1
System Control and Communication Panel
The I/O connector provides:
❑
Optically isolated (5 VDC to 24 VDC) discrete I/O interface
❑
Non-isolated Serial RS-232 interface
❑
Non-isolated analog (0 V to 10 V) output for the 979 Series Leak Detectors.
The Remote Control connector provides:
❑
Non-isolated serial interface and power connection for the Universal Remote
A.1 Optically Isolated Outputs
Table A-1 on page A-2 provides the output information for the I/O discrete connections.
Figure A-2 on page 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).
➀
➁
Summary of Contents for 979 Series
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