Red Lion GEMINI 42 - 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 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 Preset and Scale Factor Values,
to be changed in daily operation. The Gemini, 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 EXCEPT RESET ENABLED - In this mode, manual
reset is enabled, but none of the programming functions can be changed.
However, the functions can be interrogated.
2. PRESET PROGRAMMING AND RESET ENABLED - The entire front
panel is disabled with the exceptions of Preset programmability and manual
reset. All functions can be interrogated.
3. SCALE FACTOR PROGRAMMING AND RESET ENABLED - The
entire front panel is disabled with the exceptions of Scale Factor
programmability and manual reset. All functions can be interrogated.
4. SCALE FACTOR AND PRESET PROGRAMMING, AND RESET
ENABLED - The entire front panel is disabled with the exceptions of Scale
Factor and Preset programmability, and manual reset. All functions can be
interrogated.
5. PRESET AND COUNTER LOAD PROGRAMMING, AND RESET
ENABLED - The entire front panel is disabled with the exceptions of Preset
and Counter Load programmability. All functions can be interrogated.
6. PRESET, SCALE FACTOR AND COUNTER LOAD PROGRAMMING,
AND RESET ENABLED - The entire front panel is disabled with the
exceptions of Preset, Scale Factor and Counter Load programmability. All
functions can be interrogated.
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 remote reset (RST., not
RST.A) 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 terminal remote reset, and can be
used in conjunction with any front panel disable mode. The combination of a
manual and remote reset inputs provides a high level of security without
sacrificing flexibility.
DIAGNOSTICS, SELF-TEST, & “WATCHDOG” TIMER
The security of the Gemini 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. Whenever the power is turned off, all pertinent function settings and
measurements (except the Counter Load values) 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.
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