Red Lion GEMINI 33 - Manual (Page 9)

OPERATOR ACCESSIBLE FUNCTIONS WITH
PROGRAMMING DISABLED
(For details on keyboard entry, see preceding section)
One of the important features of the Gemini 3300 is the ability to disable
programming. With this ability, accidental bumping of the keys or tampering by
unauthorized personnel can be prevented. However, it may be necessary to allow
reset and certain programming functions, such as Presets and the Scale Factor
Value, to be changed in daily operation. The Gemini 3300, through the use of the
“Operator Accessible Functions” Modes can enable these functions even when
the “PGM. DIS.” (Program Disable) terminal is connected to “COMMON”.
The “Operator Accessible Functions” modes are programmed by entering
a two-digit function code (66) and the desired mode. Unlike other function
codes, the mode does not take effect immediately. The “PGM. DIS.” terminal
must be connected to “COMMON” in order for the Gemini to disable
programming and operate as per the mode programmed.
There are six basic “Operator Accessible Functions” Modes available.
These modes enable the following functions.
1. NO FUNCTIONS ENABLED
2. PRESET PROGRAMMING ENABLED
3. SCALE FACTOR PROGRAMMING ENABLED
4. SCALE FACTOR AND PRESET PROGRAMMING ENABLED
5. PRESET, COUNTER LOAD PROGRAMMING, AND 2-BUTTON
RESET ENABLED
6. PRESET, SCALE FACTOR AND COUNTER LOAD PROGRAMMING,
AND 2-BUTTON RESET ENABLED
Note: In all of the modes above, the Reset button and terminal are enabled.
All of these modes can be modified with the addition of a “-” sign. The
minus sign disables the manual reset, at the front panel and the reset
terminal at the rear of the unit.
There is also a rear panel DIP switch which permits disabling of the front
panel reset button. This is independent of the rear reset terminal, and can be
used in conjunction with any front panel disable mode.
DIAGNOSTICS, SELF TEST, & “WATCHDOG” TIMER
The security of the Gemini 3300 is further enhanced by its self-test
diagnostic and “watchdog” timer capabilities.
The diagnostics are concerned with the special, no power memory of the
Gemini 3300. When power is turned off, all pertinent function settings and
measurements are automatically saved. When power is restored, the
functions and data are re-instated. This allows you to program the unit once
and not have to re-program it until you wish to use it in another mode.
When the function codes and data are saved, computations are made with
these values. The result of these computations is stored in the memory to
serve as a check against possible error. On power-up the same computations
are repeated on the stored data. If the results do not agree with the stored
results, a “P” will appear on the left side of the display. If this occurs, refer to
the “Troubleshooting Guide” for directions.
Another error indicator is the “watchdog” timer. In order to insure the
software is functioning properly, the program constantly monitors itself. If
the proper sequence and timing of internal events does not occur, an “E” will
appear on the left side of the display. If this occurs, refer to the
“Troubleshooting Guide” for directions.
The final type of built-in error checking is the front panel initiated self-test.
It can be performed at any time, even when the Gemini 3300 is running. It will
not interfere with the accumulation of counts or control functions. A function
code of “6”, “+/-” starts the test. At this time, whatever was displayed will
disappear and be replaced by a string of decimal points and the overflow
indicator. Then the display will show a string of 9’s, then 8’s etc., until a
string of 0’s are shown. The self-test will then turn off the overflow indicator
and activate the minus “-” sign. Then the unit shows an interlace pattern of
-010101, then -212121, followed by 232323 etc., until 898989 is reached. At
this time the outputs can be tested by pressing the “1” key for Output 1, the
“2” key for Output 2, and the “3” key for Output B.
(The program disable terminal must be disconnected in order to allow
activation of the outputs. Also, when testing the output, use caution, so as not
to cause any undesirable or hazardous conditions in the system.) An
automatic exit will take place after six seconds or immediately if the Program
Disable terminal is connected to common. Normal length of display time for
each of the patterns is approximately 0.5 sec. Rapidly pressing “E” during
self-test can speed up the sequence.
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