D-1
Models 947, 948 and 960 Leak Detectors Operations and Service Manual
Appendix D. Inputs and Outputs
The Table D-1 through Table D-5 list the signals available on the connector in the turret,
and the various connectors of the optional rear panel interface.
D.1 Service Serial Interface (J1)
The service RS-232 serial interface inside the lockable turret, is used to connect to the
Service Pendant. Table D-1 provides details about this connection.
D.2 Optional Rear Panel Interface
This section includes I/O details for the connectors of the optional rear panel interface.
D.2.1 Discrete I/O Parallel Interface (J120)
The discrete I/O DB37 connector is used to control operations via a PLC.
provides details about this connection.
Table D-1
Service Serial Interface (J1)
Pin
Signal Name
Description
Input/Output
2
DATA IN
Data to the leak detector from a PC/Service
Pendant
Input
3
DATA OUT
Data from the leak detector to a PC/Service
Pendant
Output
5
DATA GROUND
Signal Return
System Ground
9
—
Dedicated to Service Pendant. Do not use.
—
Table D-2
Optional Discrete I/O Parallel Interface (J120)
Pin
Signal Name
Momentary or Level
Description
Input/
Output
1, 25
Ground return for J120
2
Reject Output
Active High
Leak rate signal is higher
than the reject set point.
Output
3
Stop
200 msec high pulse
Goes to vent mode.
Input
4
Start
200 msec high pulse
Goes to fine test via rough
gross modes.
Input
Summary of Contents for 948
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