red lion Astro Line Series Instruction Manual Download

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OPERATOR ACCESSIBLE FUNCTIONS WITH
PROGRAMMING DISABLED

One of the important features of the Gemini 5200 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 Scale Factor
Values, to be changed in daily operation. The Gemini 5200, through the use of the
“Operator Accessible Functions” modes, can enable these functions even when
the “PGM. DIS.” 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 four 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.

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 5200 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 5200. Whenever the 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.

The Gemini 5200 also contains a “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 check, is the front panel initiated self-test. It can be

performed at any time, even when the Gemini 5200 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” or “2” key. (The program disable pin must be disconnected in
order to allow activation of the outputs.) 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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