Gemini 4100, 4200 Instruction Manual

THE ASTRO LINE SERIES

GEMINI 4000 INSTRUCTION MANUAL

Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com

INTRODUCTION

The Gemini 4100 and 4200 are both units in a multi-purpose series of industrial control units that are field-programmable to solve multiple applications. This series, known as the Astro-Line family of products, is built around the concept that the end user has the capability to program different personalities and functions into the unit in order to adapt to different indication and control requirements.

The Gemini, which you have purchased, has the same high quality workmanship and advanced technological capabilities that have made Red Lion Controls the leader in today's industrial market.

Red Lion Controls has a complete line of industrial indication and control equipment, and we look forward to being of service to you now and in the future.

CAUTION: Risk of Danger.

Read complete instructions prior to

installation and operation of the unit.

CAUTION: Risk of electric shock.

Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com

T ABLE OF CONTENTS

I. GENERAL DESCRIPTION 2

A) Safety Summary

B) Programming The Gemini

C) Programming The Personality

D) Programming The Presets, Scale Factors, Timed Outputs & Counter Load Values

3-5

E) Initial Factory Configuration Counter/Rate & Dual Counter Factory Settings

F) Operator Accessible Functions With Programming Disabled

G) Diagnostics, Self-Test, & “Watchdog” Timer

7-8

H) Input Circuitry & Set-up

I) Overflow Indication

II. PROGRAMMING INSTRUCTIONS FOR THE COUNTER/RATE VERSION OF THE GEMINI

A) Codes 41, 42, 43, 44, 45, & 46, 51, 52, 53, 54, 55, & 56

9-14

B) Codes 61, 62, 63, 64, 65, 66, Preset Values, Scale FactorsA&B,Counter Load Value

15-17

C) Dual Preset Counter & Rate Application

18-19

III. PROGRAMMING INSTRUCTIONS FOR THE DUAL COUNTER VERSION OF THE GEMINI

A) Codes 41, 42, 43, 44, 45, & 46

20-22

B) Codes 51, 52, 53, 54, 55, & 56

22-25

C) Codes 61, 64, 65, 66, Preset Values, Scale FactorsA&B,Counter Load Values

25-27

E) Dual Counter Batching Application

28-29

IV. 20 MA CURRENT LOOP COMMUNICATIONS

A) Communication Format

B) Sending Commands & Data To The Gemini

30-32

C) Receiving Data From The Gemini

D) Print Options

E) Current Loop Installation

F) Communications Application

G) Troubleshooting Gemini Serial Communications & Serial Loop-Back Self-Test

V. APPENDIX “A” - INSTALLATION & INPUT CONFIGURATION SWITCH SET-UP

37-45

VI. APPENDIX “B” - SPECIFICATIONS & DIMENSIONS

46-47

VII. APPENDIX “C” - TROUBLESHOOTING GUIDE

48-49

VIII. APPENDIX “D” - COUNTER/RATE & DUAL COUNTER MODE FUNCTION COMMAND CODE SUMMARY 50-57 IX. APPENDIX “E” - SCALING FOR COUNTING

58-59

X. APPENDIX “F” - SCALING FOR RATE

60-61

XI. APPENDIX “G” - GEMINI 4100 PROGRAMMING CHARTS

62-64

XII. APPENDIX “H” - GEMINI 4200 PROGRAMMING CHARTS

65-69

XIII. APPENDIX “I” - ORDERING INFORMATION

GENERAL DESCRIPTION

The Gemini 4000 series (4100 & 4200) instruments are two input microprocessor based dual function counter/rate or dual counter instruments. The 6-digit display features 0.56" high LEDs with negative sign, overflow and displayed value indicators (A & B) located to the left of the display. When programmedasa counter/rateinstrument,the Aindicator willbe on whenthe rate is displayed and the B indicator will be on when the count is being displayed. Pushing the “+/-” button toggles the display between the counter and rate or the two counters depending on the personality selected.

TheGemini 4000 seriesconsists of two basicunits, a single presetversion, the Gemini 4100, and a two preset version, the Gemini 4200. Each basic unit is also availablein 115/230VAC versions,with orwithout Serialcommunicationsand a relay board. The 20 mA current loop option (serial communications) makes possible remote or computerized monitoringor control of the Count, Presets and Scale Factors.

Flexibility and usefulness are insured through user programmability. With simplefront panelkeystrokes and rearpanel switch settings, any one of anumber of configurations can be selected. Once the selection is made, all or part of the keyboard can be disabled to protect the settings and guarantee that no unwanted changes can occur during the measurements.

Eachtime the power is turned off,the unit automaticallysaves the settings and data in its special no power memory. When power is restored, the Gemini sets itself back to the operational modes and restores the data it h ad at power down. The “no power” E

PROM’s life expectancy is at least 100,000 cycles of power

being applied to and removed from the unit.

Whenever the power comes on, the Gemini performs a series of internal diagnosticsto verify theintegrity of the storeddata. There isalso a self-test mode and a “watchdog” timer to help prevent processor lockup.

TheGemini 4000 series counters can accept bi-directional, uni-directional, or quadrature signals. They also have the capability to double or quadruple (Quadrature x4) the resolution of the incoming count signal. A separate input mode is available to make the counter/rate or dual counters completely independent of each other.

Oneinput provides the signalfor rate or a counterand the other input provides the signal for a counter. An anti-coincidence add/subtract mode is also provided to obtain a difference between two input signals.

Each channel features separate scaling and decimal point placement for readout in different units or at different resolutions.

A Counter Load feature enables the operator to modify the count value under circumstances that occur when flawed material has been counted and it is necessaryto adjustthe count valueaccordingly. TheCounter Load featurecan be “locked out” in applications where it is not required.

The Rate Indicator portion uses a time interval method (1/tau) to calculate the ratevalue. This method enables high resolution at all rates. The unit counts input pulses and after a programmable minimum update time has occurred, it waits until the next edge occurs, takes the elapsed time and number of edges, and calculates the rate value. At slower rates, averaging can be accomplished by programming the “Rate Minimum Update Time” (0.5 sec. to 16 sec.) for the desired response. Extensive scaling capabilities allow practically any desired reading at very slow count rates.

For maximumflexibility, the Gemini’s output(s) can be assigned to either the rate or count channels or one to each. When in dual counter mode, the output(s) can be assigned to the Counter B channel. For the Gemini 4200, one can be assigned to Counter A and the other to Counter B.

The relay(s) are mounted on a p lug-in board which makes it easy to field upgradeyourGemini. Thecontacts arerated for240 VACor 28VDC at5 amps.

The construction of the Gemini features a metal, die cast bezel fo r maximum durability with high quality appearance. The sealed front panel meets NEMA 4/IP65 specifications for washdown and/or dust, when properly installed. Electrical connections are made with removable, plug-in terminal strips at the rear of the unit. Clamp-type pressure plate terminals accept stripped #14 AWG wire without lugs.

SAFETY SUMMARY

All safety related regulations, local codes and instructions that appear in the manual or on equipment must be observed to ensure personal safety and to prevent damage to either the instrument or equipment connected to it. If equipment is used in a manner not specified by the manufacturer, the protection provided by the equipment may be impaired.

Donot use this unit to directly commandmotors, valves, orother actuators not equipped with safeguards. To do so, can be potentially harmful to persons or equipment in the event of a fault to the unit.

PROGRAMMING THE GEMINI

When your Gemini arrives from the factory, it has already been programmed to function as a counter and rate indicator. It is programmed with the factory settings listed in the “Initial Factory Configuration” section. If it is required to have the unit operate as two counters, the Unit Personality function code can be changedtodoso.

The personality, functions, and modes are accessed by pressing the appropriate keys.A function isdefined by atwo-digit code which appears on the leftside of the display.The mode of that function is shown as aone-digit code on the right side of the display. At times there will be a “-” sign modifier to the left of the mode.

Data for the Presets, Scale Factors, Timed Output Values, and Counter Load Values are entered differently. Each digit key controls the digit on the display directlyabove it. Changing the digits can be done by repeatedly pressing the key beneaththe digit positionyou wish tochange or byholding the keydown. As you holdit down, orrepetitively press it, thevalue of that digit will change cyclically, countingup to9, then to0, and then up again.The 6 numbered keyscorrespond to the six digits, and the “+/-” key corresponds to polarity.

PROGRAMMING THE PERSONALITY

Entering function and mode is easily accomplished by pressingthe appropriate digitkey. For thepersonality function, you would enter 41 by pressing the front panel keys 4 and 1.

Thedigits on the leftside of the display show the function code; the digits on the right side show the current programmed mode.

A mode selection is made by entering a new number . On someof the entries, you have the option of a plus “+” or minus “-” sign. In the cases where a “+” sign is required, no sign will be displayed. If you do enter a “-” sign (using the “+/-” key), a minus sign will be displayed in front of the appropriate digit.

Pressing the “E” key finalizes the change. The display will now show the count or rate value immediately.

If you do not press the “E” key, the change will not be recorded.The display will remainin the programmingmode for 15 seconds, and then return to normal operating mode using the old functional mode setting.

Whenever the Unit Personality is changed, the factory settings will automatically be loaded into the unit. The factory settings can also be programmedinto theunit by calling upthe Unit Personality, puttinga “-” in front of the mode by pushing the “+/-” button, and entering it.

Refer to the “Initial Factory Configuration” section for more details.

PROGRAMMING THE PRESET, SCALE FACTORS, TIMED OUTPUTS & COUNTER LOAD VALUES

The Presets and Scale Factor Values are commonly reprogrammedon a daily basis. As such, single keystroke access has been provided.

The Gemini has two Scale Factors, one for display A (Counter A or Rate A), and one for display B (Counter B). Pressing the “3” key will call up the Scale Factor for the current display (Rate A/Counter A, or Counter B).

To call up the “other” Scale Factor, the “+/-” key is first pushed to change the displayto the“other” value, then the “3”key is pushedto displaythe ScaleFactor for that value.

PROGRAMMING THE PRESET, SCALE FACTORS, TIMED OUTPUTS & COUNTER LOAD VALUES (Cont’d)

Once the Scale Factor is displayed, changing the digits canbe accomplished by repeatedly pressing the key beneath the digit position you wish to change or by holding the key down, allowing the digit to cycle.

The new value will be entered when the “E” key is pressed.

The internal count value is multiplied by the Scale Factor Value, which changesthe displayed value accordingly.It is importantto note thatthe precision ofan application cannot be improvedby usinga ScaleFactor greater thanone. To accomplish g reater precision, mo re pulse information must be generated per measuring unit. For example, if 5 pulses are being received per foot of material, the precision of 10th of feet cannot be attained by simply programming a Scale Factor of 2.0000, even though the display is reading in tenths. In this case, the display will increment by two for each count input. Thus, if an odd Preset Value is entered, such as 6.7 ft., the Gemini will alter the Preset display to read in even tenths of feet.

To display the Preset 1 Value the “1” key is pushed.

To change the value, the digits can be cycled through in the same manner as discussed for the Scale Factor. The preset values can range from -999999 to +999999.

The new value will be entered when the “E” key is

pressed.

The Scale Factor Value will have a direct effect on the preset being entered (if assigned to the counter). For Scale Factors greater than one, the preset value should be an integer multiple of the Scale Factor. If it is not, the Gemini will automaticallyadjust the preset value up or down to force it to be evenly divisible by the Scale Factor.

The Timed Output 1 or 2 Value is changed by entering a two-digit function code. After the code is entered, the display will show the present Timed Output Value in seconds with two decimal place resolution. The Timed Output Values can be set from .01 to 599.99 seconds.

Tochange the TimedOutput 1 Value, enterfunction code 53 and enter the new value by holding down or repeatedly pressingthe keybelow thedigit positionyou wishto change. The new value will be entered when the “E” key is pressed. The display will immediately return to the count value.

Note: ATimed Output Value of zero cannot be programmed into the Gemini. If a

value of 0 is entered into the display and the “E” key is pressed, the unit will

remain in data entry mode. Ifa new valueis not entered,it will timeout and the

unit will continue to use its previous setting.

As with the other functions, you mustpress “ E” to record thechanges. For the data entrymodes, if you do not press the “E” key, a time out of 5 seconds occurs, and the display returns to operating mode without any changes to the value. The only time any change will occur is when the “E” key is pressed.

It is possible to change the counter values of the Gemini. This feature can be enabled or disabled by the programming of the “Operator Accessible Functions Modes”,function code 66.The “Counter LoadValue” is not stored when the unit ispowered down. When theunit is powered up,the Counter Load valuesfor both counters(if Dual counter personality) arereset to zero. Once changed, thevalues will be held until the unit is again powered down.

Toaccess the Counter Load valuefor the desired counter; first, press the “+/-” key, if necessary, so that the display is indicating the counter value which is to be changed.

Secondly, press the “E” key and while holding it down, press the “+/-” key.

TheGemini will now displaythe displayed Counter Load value. (It will be zero, unless the value had been changed since the unit was powered up.)

To change the value, press the key under the digit to be changed as explained previously for the Preset.

To load the value into the counter, press the “E” key.

The display will flash momentarily and will display the counter with the new value.

INITIAL FACTORY CONFIGURATION DUAL COUNTER FACTORY SETTINGS*

Keys struck Display Description

4,1 41 2 Personality selected as DUAL COUNTER 4,2 42 3 Reset Counters A & B 4,3 43 1 Count with Inhibit 4,4 44 1 Single edge counting (A & B) 4,5 45 1 Counter B Scale multiplier of 1.0 4,6 46 1 Counter B leading zero blanking and no decimal point 5,1 51 2 Outputs 1 & 2 assigned to Counter B 5,2 52 3 Output 1 terminates at Reset, Normal Phase. 5,3 0000.10 Timed Output 1 Value of 0.1 Sec 5,4 54 3 Output 2 terminates at Reset, Normal Phase. 5,5 0000.10 Timed Output 2 Value of 0.1 Sec 5,6 56 1 Counter B, manual reset to zero 6,1 61 1 Counter A, manual reset to zero 6,4 64 1 Counter A scale multiplier of 1 6,5 65 1 Counter A leading zero blanking, no decimal point 6,6 66 1 No functions except Reset enabled

3 01.0000 Scale Factor A set to 1.0000 3 01.0000 Scale Factor B set to 1.0000 1 000500 Preset 1 set to 500 2 001000 Preset 2 set to 1000

* If [41 1] is changed to [41 2], then the factory settings are as shown.

Keys struck Display Description

4,1 41 1 Personality selected as COUNTER/RATE 4,2 42 3 Reset Rate (A) Output(s) & Counter (B) 4,3 43 1 Count with Inhibit 4,4 44 1 Single edge counting (B) 4,5 45 1 Counter B Scale multiplier of 1.0 4,6 46 1 Counter B leading zero blanking and no decimal point 5,1 51 2 Outputs 1 & 2 assigned to Counter (B) 5,2 52 3 Output 1 terminates at Reset, Normal Phase 5,3 0000.10 Timed Output 1 Value of 0.1 Sec 5,4 54 3 Output 2 terminates at Reset, Normal Phase 5,5 0000.10 Timed Output 2 Value of 0.1 Sec 5,6 56 1 Counter (B), manual reset to zero 6,1 61 4 No Rate (A) right hand dummy zeros 6,2 62 1 Rate per Second 6,3 63 1 Rate (A) 0.5 Sec Minimum Update Time 6,4 64 4 Rate (A) Scale multiplier of 1 6,5 65 1 Rate (A) leading zero blanking, no decimal point 6,6 66 1 No functions except Reset enabled

3 01.0000 Scale Factor A (Rate) set to 1.0000 3 01.0000 Scale Factor B (Counter) set to 1.0000 1 000500 Preset 1 set to 500 2 001000 Preset 2 set to 1000

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 unauthorizedpersonnel can be prevented.However, it maybe necessary to allow resetand certainprogrammingfunctions, such asPreset 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 - Theentirefront

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 d isabled 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.

Thereis alsoa rearpanel DIP switchwhich permitsdisabling of thefront 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

thesevalues. The result of these computationsis stored in the memoryto 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 appearon the left side of the display. If this occurs, refer to the “Troubleshooting Guide” for directions.

DIAGNOSTICS, SELF-TEST, & “WA TCHDOG”TIMER [Cont’d]

Another error indicator is the “watchdog” timer. In order to insure the software is functioning properly, the program constantly monitors itself. If the propersequence and timing of internal events does not occur, an “E” will appear onthe left sideof the display.If this occurs,refer tothe “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 is running. It will not interferewith theaccumulation o f counts orcontrol functions.A functioncode 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 displaywill 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 pressingthe “1” or “2” key. (The program disable terminalmust 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 immediatelyif 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.

INPUT CIRCUITRY & SET-UP

There are two independent input channels on the Gemini. Various types of sensor outputs can be accommodated by appropriate DIP switch set-up. These include: TTL or CMOS logic, current sinking, current sourcing, or dry contact and more.

Channel 1 consists of a logic input and a separate low level magnetic pickup input.

Channel 2 is a completely independent count or control input channel. Like Channel 1, it can be programmed with DIP switches for a wide variety of logic inputs, and is identical to Channel 1 in this regard. For a complete detailed description of input set-up, see Appendix “A”.

OVERFLOW INDICATION

The Gemini features an overflow indicator (LED) which is located to the left of thesixth digit and above the polarity annunciator. This LED will turn on if the capacity of the display (6-digits) is exceeded or if the internal count capacity (9-digits) is exceeded. Use of extremely small scale multiplier and Scale Factor Values can cause the internal count capacity to overflow bef ore the displayed valuewould overflow. It should also be noted thatthe use of RightHand Dummy Zeros or Scale Factors larger than one could cause the displayed value to overflow before a v alue of 999,999 (6-digits) is accumulated.

When the capacity of the display is exceeded, the count value will be maintainedand willbe valid. But if the internal countvalue is exceeded,then this value may no longer be valid.

The overflow LED can also turn on under certain conditions when the rate inputfrequency exceeds the maximum3250 cps allowed for a rate update period of 16 sec. See Code 63 - “Rate Minimum Update Time”.

PROGRAMMING INSTRUCTIONS FOR THE COUNTER/RATE VERSION OFTHE GEM INI 4000

The first part of this section provides d etailed descriptions of the function command codes for inputs response modes, reset modes, output terminations, etc.Then, using an actualapplication example, the programming instructions for a Counter/Rate version will be “walked through”, to give the user a full understanding of the Gemini programming procedure. The descriptions below give the function command code first, followed by the individual mode identifier. The Function Command Code Summary in the appendix, lists all codes. (Only commands and modes p ertaining to the Counter/Rate personality will be discussed in this section.)

CODE 41 - UNIT PERSONALITY

The Gemini can be programmed to operate in one of two different personalities. In each of the two unit personalities, the Gemini operates as a dual function indicator. The personality selected determineswhether display channel A will indicate rate o r count. In both personalities, display channel B operates as a counter.

When the Unit Personality is changed and entered, all modes and data values (Preset, Scale Factors, function codes etc.) will be automatically loaded with the factory settings for that personality. If, for any reason during p rogramming, it is desired to return to the factory settings (while in code 41), the “+/-” key can be pushed. When the “E” key is pressed the unit will load the factory settings into the Gemini.

Theprogramming procedure will vary for the two unit personalities. This entire section deals with the unit programmed as a Counter/Rate indicator, [41 1].

[41 1]COUNTER (B)/RATE(A) -In thismode, displaychannel Afunctions as

a rate indicator and display channel B functions as a counter. See the

“PROGRAMMING INSTRUCTIONS FOR THE GEMINI 4000” section

for details. [41 2]DUALCOUNTER - In this mode,both display channels, A &B, function

as counters.

CODE 42 - RESET BUTTON & TERMINAL ACTUATION MODES

The “Reset Button & Terminal Actuation Modes” controls the affect that the reset button and terminal have on the two display channels. Resetting will not affect the rate d isplay in any manner. If the output(s) is assigned to the rate channel, activating thereset button or terminal will reset the rate output(s) if that particularresponse modeis programmed.Resetting counter (B)will always reset the assigned output(s).

There is a separate “RST. A” terminal, which resets the Rate (A) output when activated (if output(s) is assigned to rate). It is provided to allow independent resetting of each channel.

[42 1] RESET RATE (A) OUTPUT(S) [42 2] RESET COUNTER (B) [42 3] RESET RATE (A) OUTPUT(S) AND COUNTER (B)

CODE 43 - INPUTS1&2RESPONSE MODES

The Gemini has six different input response modes. They are: Count(1) with Inhibit(2); Count(1) with Up/Down Control (2); Two input anticoincidence Add(1)/Subtract(2);Separate Input mode; Quadrature; and Quadrature x4. In all modes, except [43 4], Input 1 is used by both the counter and rate channels.

[43 1] COUNTWITH INHIBIT- Input 1serves as thecount andrate input. Input

2 serves as the Inhibit input. When Input 2 is low, the counter will ignore the

count signal appearing at Input 1. The rate channel, however, will continue to

indicate the rate of the signal on Input 1.

WhenInput 2is at a high level,the signal appearing on Input1 will be counted.

The “Counter (B) Reset Modes” will determine the count direction. In

applications where the Inhibit function is not actually used, the Input 2

“SRC/SNK” position of the “INPUT CONFIGURATION DIP SWITCH”

should b e set to the “SNK” position to provide a 7.8 Kohm pull-up resistor.

This will set Input 2 to the Non-Inhibit state.

CODE 43 - INPUTS1&2RESPONSE MODES [Cont’d]

[43 2] COUNT WITH UP/DOWN CONTROL - In this mode, count direction

canbe controlledby thesecond input. Input 1 servesas thecount andrate input and Input 2 serves as the direction control signal input. When Input 2 is at a highlevel, thecounter willcount up.When Input2 is at a lowlevel, thecounter will count down. The rate is not affected by the directional control Input 2.

[43 3] TWO INPUT ANTI-COINCIDENCE ADD/SUBTRACT - This mode

effectively separates count pulses which may simultaneously appear at the two inputs. The Gemini unit processes the count pulses into a string of time-separated pulses, so the internal counter will not lose any count pulses. Input 1 serves as the add and rate input (count increments) and Input 2 serves as the subtract input (count decrements).

[43 4] SEPARATE INPUT - In this mode, the two functions, Counter (B) and

Rate(A) are independently controlled by theinputs. Input 1 serves as the Rate (A) input and Input 2 serves as the Counter (B) input.

[43 5] QUADRATURE COUNTING - Quadrature counting modes are

primarilyusedin positioning and anti-jitter applications.The reasonthis mode works is due to the manner in which two pickups are positioned relative to each other. The signal on Input 2 is a pulse train signal shifted 90° away from theInput 1signal. Thesetwo signalsare processedby theGemini as follows: Input 1 serves as the count and rate input, while Input 2 serves as the quadrature input. For quadrature with single edge counting, the counter will countin a positive direction when Input 1 is a negative going edge and Input 2 is at a low level. The counter will count in a negative direction when Input1 is apositive going edgeand Input 2is at alow level. All transitions on Input 1 are ignored when Input 2 is at a high level. These logic rules provide the basis for anti-jitter operation which will prevent false counts from occurring due to back-lash, vibration, chatter, etc. Whentwo edge counting is used, the quadrature mode works the same as with single edge counting when Input 2 is low. But when Input 2 is at a high level, counts at Input 1 are no longer ignored. Instead the logic rules for Input 1 are complemented,allowing bothedges of Input 1to be counted. Thisdoubles the effective resolution of the encoded input. The rate indicator will only use the falling edge of the Input 1 signal, due to the method of rate indication used.

[43 6] QUADRATURE TIMES 4 - This mode takes the quadrature mode, with

two edge counting, one step further. In quadrature times 4, both Input 1 and

Input2 serve as the count or quadrature input, depending on their state. In one

instance, Input 1 will serve as the count input and Input 2 will serve as the

quadrature input. In another instance, Input 1 will be the quadrature input and

Input 2 will be the count input. This enables each edge, positive and negative

going, of both inputs, 1 and 2, to be counted. This results in a resolution four

times greater than in the basic quadrature x1 mode. As in the other modes,

Input 1 is also used for the rate input. The rate indicator will only use the

falling edge of the Input 1 signal, due to the method of rate indication used.

CODE 44 - COUNTER (B) NUMBER OF COUNT EDGES

The counter of the Gemini can be programmed for either single or two edge (x2) counting. The number of count edges cannot be set when the count mode is programmedfor quadrature x4 operation. The Gemini will ignore any attempt to enter function command code 44 when set for quadrature x4.

[44 1] SINGLE EDGECOUNTING (x1) - Theunit counts on the negative going

(falling) edge of the count input signal. The count mode descriptions describe

how each mode uses this method of edge counting. [44 2]TWO EDGE COUNTING (x2) - This mode is used when doubling of the

count signal input is required. The unit counts on the positive going (rising)

edge of the count input signal, as well as, the negative going (falling) edge.

CODE 45 - COUNTER (B) SCALE MULTIPLIER

Thereare four CounterB Scale Multipliersthat are available.They effectively divide the internal Count B value by 1, 10, 100, and 1000 respectively, to yield the displayed Counter B value. Note: Use of a small scale multiplier in conjunction with a small Scale Factor could cause the internal count value to be exceeded before the 6-digit display value is exceeded. See “Programming the Presets, Scale Factors, Timed Outputs & Counter Load Values” section for more details.

[45 1] x1 [45 2] x0.1 [45 3] x0.01 [45 4] x0.001

CODE 46 - COUNTER (B) DECIMALPOINT & LEADING ZERO BLANKING

There are six basic modes of decimal point placement for the counter of the Gemini. The decimal point is placed to the right of the display digit that corresponds to the mode identifier. (The right most decimal point, digit 1, is never turned on.) A “-” sign in front of the mode identifier will inhibit leading zero blanking. The absence of a “-” sign will enable leading zero blanking.

[46 1] 0 [46 2] 0.0 [46 3] 0.0 0 LEADING ZERO [46 4] 0.0 0 0 BLANKING [46 5] 0.0000 [46 6] 0.00000

[46 -1] 000000 [46 -2] 00000.0 [46 -3] 0 0 0 0.0 0 LEADING ZERO [46 -4] 0 0 0.0 0 0 BLANKING INHIBITED [46 -5] 00.0000 [46 -6] 0.00000

CODE 51 - OUTPUT ASSIGNMENT

The output(s) of the Gemini 4000 can be assigned to either the rate or count channel. Assigning the output(s) to the rate [5 1 3] will automatically configure the “Counter (B) Reset Mode” to Reset to Zero, [56 1].

The Gemini 4200 has a Preset tracking feature which allows Preset 1 to track Preset 2. If Preset tracking is programmed, whenever the Preset 2 value is changed, the Preset 1 value will also change to maintain the same offset. For example, if Preset 1 is 100 and Preset 2 is 200, changing Preset 2 to 300 will automaticallychange Preset 1 to 200, maintaining same 100 unit offset. In o rder tochange the amount ofoff set, the Preset 1 value is changed. The Preset tracking feature is programmed by adding a “-” modifier in front of the desired mode.

[51 1] OUTPUT 1 ASSIGNED TO RATE (A), OUTPUT 2 TO COUNTER

(Gemini 4200 only)

[51 2] OUTPUTS 1 & 2 ASSIGNED TO COUNTER (B) [51 3] OUTPUTS 1 & 2 ASSIGNED TO RATE (A)

[51 -1] [51 -2]

These modes are identical with the exception

[51 -3]

that Preset Tracking is enabled.

CODE 52 - OUTPUT 1 TERMINATION MODES

The Gemini has six “Output 1 Termination Modes” which control the way Output 1 will terminate or reset. In all modes, Output 1 will terminate immediately when the channel to which it is assigned is manually reset.

Forthe Gemini 4200, the Output1 termination modes 1 & 2 are available only when both outputs are assigned to the Counter (B), [51 2].

A reverse phase mode is available on the Gemini. This refers to the complementing of the logic state of the output. With normal phase operation, when the display value reaches Preset 1, Output 1 will turn on. The reset conditionof Output 1 is outputoff. In reverse phase operation,Output 1 turns off when the Preset 1 Value is reached. The reset condition of Output 1 is output on. (Note: The state of the relay, if used, is also reversed.) A “-” sign in front of the mode identifier will provide for reverse phase operation. The absence of a “-” sign will indicate normal phase operation.

CODE 52 - OUTPUT 1 TERMINATION MODES (Cont’d)

[52 1] TERMINATE AT OUTPUT 2 START - Output 1 will terminate when

Output2 starts.Output 1is setfor normalphaseoperation. (Gemini4200 Only)

[52 2] TERMINATE AT OUTPUT 2 END - Output 1 will terminate when

Output2 ends.Output 1is setfor normalphaseoperation. (Gemini4200Only)

[52 3] TERMINATE AT MANUAL RESET - Output 1 activates when the rate

or count, whichever it is assigned to, is greater than or equal to the Preset 1 Value.In this mode, once Output 1 is activated, it does not deactivate until the moment a reset occurs. Output 1 is set for normal phase operation.

[52 4] TERMINATE AT MANUAL RESET END - This mode is like the

preceding, except Output 1 deactivates when reset ends. Output 1 is set for normal phase operation.

[52 5] TERMINATE AFTER TIMED OUTPUT 1 - Once Outp u t 1 has been

activated, it will deactivate after the predetermined length of time (code 53) has expired. Manual reset will override the timed output and reset Output 1. Output 1 is set for normal phase operation. When Output 1 alone is assigned to the rate [51 1], the output will activate whenthe rate is greater than or equal tothe Preset 1 Value. When both outputs areassigned to Rate [51 3], Output 1will act as an “underspeed” detect. It will activate when the rate is less than or equal to the Preset 1 Value. Output 1 will activate every update time period for which the above conditions are true. If the Timed Output 1 Value, code 53, is greater than the rate update time, the outputwill appear to be latched on,deactivating when therate dropsbelow the Preset and the output time expires.

[52 6] BOUNDARY MODE - When in boundary mode, the Preset 1 Value

serves as the boundary point. When the display value (count or rate) is less than the Preset 1 Value, Output 1 is not activated (normal phase). When the display value is greater than or equal to the Preset 1 Value, Output 1 is activated. If the display value were to drop below Preset 1, Output 1 would then deactivate. For negative Preset points, Output 1 is not activated when the count value is more positive than the Preset 1 Value. When the count is more negative than (only possible with counter) or equal to Preset 1, Output 1 is activated. If the count becomes more positive than the Preset 1 Value, the

output again deactivates. When Output 1 is assigned to the counter and the

Preset 1 value is changed, Output 1 will immediately go to the proper state.

Uponpower up,Output 1, if assigned toCounter B, will“remember”its power

down boundary condition and go to that state. Output 1 is set for normal

phase operation.

[52 -1] [52 -2] [52 -3] These modes are the same as above with the exception [52 -4] that the output is set for reverse phase operation. [52 -5] [52 -6]

CODE 53 - TIMED OUTPUT 1 VALUE

TheGemini has the capability of varying the Timed Output 1 Value from 0.01 second to 599.99 seconds. When the code is entered, instead of a single mode identifierdigit being displayed, six digits will be shown. Refer to “Programming the Presets, Scale Factors, Timed Outputs & Counter Load Values” section for more details about entering. The timed output will be terminated if the unit is manually reset.

The Timed Output 1 Value is used only when in Timed Output 1 Termination mode, [52 5].

Note: ATimed Output Value of zero cannot be programmed into the Gemini. If a

value of 0 is entered into the display and the “E” key is pressed, the unit will

not enter the 0, but will stay in the data entry mode. If a new value is not

entered, it willtime out and the unitwill continue touse its previous setting.

CODE 54 - OUTPUT 2 TERMINATION MODES (GEMINI 4200 Only)

The Gemini 4200 has six “Output 2 Termination Modes” which control the way Output 2 will terminate or reset. In all modes, Output 2 will terminate immediately when the channel to which it is assigned is manually reset.

Output 2 termination modes 1 & 2 are available only when both outputs are assigned to the Counter (B), [51 2].

A reverse phase mode is available on the Gemini 4200. This refers to the complementing o f the logic state of the output. With normal phase operation, when the display value reaches Preset 2, Output 2 will turn on. The reset conditionof Output 2 is outputoff. In reverse phase operation,Output 2 turns off when the Preset 2 Value is reached. The reset condition of Output 2 is output on. (Note: The state of the relay, if u sed, is also reversed.) A “-” sign in front of the mode identifier will provide for reverse phase operation. The absence of a “-” sign will indicate normal phase operation.

[54 1] TERMINATE AT OUTPUT 1 START - Output 2 will terminate when

Output 1 starts. Output 2 is set for normal phase operation. [54 2] TERMINATE AT OUTPUT 1 END - Output 2 will terminate when

Output 1 ends. Output 2 is set for normal phase operation. [54 3] TERMINATE AT MANUAL RESET - Output 2 activates when the rate

or count, whichever it is assigned to, is greater than or equal to the Preset 2

Value.In this mode, once Output 2 is activated, it does not deactivate until the

moment a reset occurs. Output 2 is set for normal phase operation. [54 4] TERMINATE AT MANUAL RESET END - This mode is like the

preceding, except Output 2 deactivates when reset ends. Output 2 is set for

normal phase operation. [54 5] TERMINATE AFTER TIMED OUTPUT 2 - Once Output 2 has been

activated, it will deactivate after the predetermined length of time (code

55) has expired. Manual reset willoverride thetimed output and resetOutput

2. When assigned to count or rate, Output 2 will activate when the display

valueis greater than or equal to the Preset 2 Value. Output 2 is set for normal

phase operation. [54 6] BOUNDARY MODE - When in boundary mode, the Preset 2 Value

serves as the boundary point. When the display value (count or rate) is less

than the Preset 2 Value, Output 2 is not activated (normal phase). When the

display value is greater than or equal to the Preset 2 Value, Output 2 is

activated. If the display value were to drop below Preset 2, Output 2 would

then deactivate. For negative Preset points, Output 2 is not activated when the

count value is more positive than the Preset 2 Value. When the count is more

negative than (only possible with counter) or equal to Preset 2, Output 2 is activated. If the count becomes more positive than the Preset 2 Value, the output again deactivates. When Output 2 is assigned to the counter and the Preset 2 value is changed, Output 2 will immediately go to the proper state. Uponpower up,Output 2, if assigned toCounter B, will“remember”its power downboundary condition and go to that state. Output 2 is set for normalphase operation. Programming Boundary mode will automatically select [56 1], if [51 1 or 2] is programmed.

[54 -1] [54 -2] [54 -3] These modes are the same as above with the exception [54 -4] that the output is set for reverse phase operation. [54 -5] [54 -6]

CODE 55 - TIMED OUTPUT 2 VALUE (GEMINI 4200 Only)

TheGemini 4200has the capabilityof varying theTimed Output2 Value from

0.01 second to 599.99 seconds. When the code is entered, instead of a single mode identifier d igit being displayed, six digits will be shown. Refer to “Programming the Presets, Scale Factors, Timed Outputs & Counter Load Values” section for more details about entering. The timed output will be terminated if the unit is manually reset.

The Timed Output 2 Value is used only when in Timed Output 2 Termination

mode, [54 5].

Note: A Timed Output Value of zero cannot be programmed into the Gemini

4200. If a value of 0 is entered into the display and the “E” key is pressed, the unit will not enter the 0, but will stay in the data entry mode. If a new value is not entered itwill time out and theunit will continueto use its previous setting.

CODE 56 - COUNTER (B) RESET MODES

The Gemini 4000 has six different counter reset modes. There are also two methodsby which manualreset can acton the counter (resetmust be enabled, see function code 66 and dip switch set-up). The first is a “maintained” reset action, where the unit is held at reset for as long as the reset terminal or reset button is activated.The secondis a “momentary”reset, inwhich the unit resets, whenreset isactivated, and starts countingeven though the terminalor reset buttonmay still be active. A “-” sign in front of the mode identifier indicates “momentary” reset action, the absence of the “-” sign indicates “maintained” reset action.

For the Gemini4200, if both outputs are assigned to the Rate Channel [51 3], orthe Output2 Terminationmode isboundary [54 6], the only Counter (B)Reset mode that is available is Reset to Zero [56 1].

In Reset to Zero modes the Output (if assigned to Counter B) activates at the Preset Value. In Reset to Preset modes the Output activates at zero.

In the “Reset to Preset” modes, for proper operation, the counter normally counts down. In the “Count with Inhibit” and “ Separate Inputs” input response modes, [43 1 or 4], the unit will automatically count down if a Reset to Preset mode is selected. In the other input response modes, proper input phasing is required for down counting. See “CODE 43 - INPUTS 1 & 2 RESPONSE MODES” section for more details.

Note: The Reset Button & Terminal Actuation Mode must be programmed to

mode [42 2 or 3] in order to be able to manually reset the Counter (B). The

activation and de-activation response time for reset is 10 msec. Note: For the Gemini 4200, all reset to preset modes reset to preset 2and Timed

Output refers to Output 2.

[56 1] MANUAL RESET TO ZERO (RTZ) - Manual reset to zero is

accomplished by pulling the “RST.” terminal to “COMMON” or, if the front

panel reset is enabled, by pressing the front panel reset button. Reset is

“maintained”. [56 2] MANUAL RESET TO PRESET (RTP) - Manual reset to Preset is

accomplished by pulling the “RST.” terminal to “COMMON” or, if the front

panel reset is enabled, by pressing the front panel reset button. Reset is

“maintained”.

[56 3] AUTOMATIC RESET TO ZERO AFTER TIMED OUTPUT - The

counter automatically resets to zero when Timed Output ends. Manual reset is “maintained”and will override automatic reset. The “Output Termination Mode” should be programmed for timed output operation, [54 5], when in this mode.

[56 4] AUTOMATIC RESET TO PRESET AFTER TIMED OUTPUT - The

counter automaticallyresets to Preset when TimedOutput ends. Manual reset is “maintained” and will override automatic reset.

The “Output Termination Mode” should be programmed for timed output

operation, [54 5], when in this mode. [56 5] AUTOMATIC RESET TO ZERO AT BEGINNING OF TIMED

OUTPUT (AT PRESET) - In this reset mode, the counter will automatically reset to zero at the beginning of Timed Output (at Preset). The Timed Output Value must be shorter than the time required for the counter to count to the PresetValue, otherwise, the Output will appear to be latched on. Manual reset is “maintained” and will override automatic reset. The “Output Termination Mode” should be programmed for timed output operation, [54 5], when in this mode.

[56 6] AUTOMATIC RESET TO PRESET AT BEGINNING OF TIMED

OUTPUT(AT ZERO)- In this reset mode,the counterwill automaticallyreset to Preset at the beginning of Timed Output (at zero).The Timed Output Value must be shorter than the time required for the counter to count to zero, otherwise, the Output will appear to be latched on. Manual reset is “maintained” and will override automatic reset. The “Output Termination Mode” should be programmed for timed output operation, [54 5], when in this mode.

[56 -1] [56 -2] [56 -3] These modes are the same as above with the exception [56 -4] that manual reset is set for “momentary” operation. [56 -5] [56 -6]

CODE 61 - RATE (A) RIGHT HAND DUMMY ZEROS

Dummy zeros can be used to alleviate display fluctuations due to an unstable inputsignal. Thesezeros effectivelymove significantdigits tothe left.Therefore, a normal count of 1 could be shown as a 10, 100, or 1000. Using the dummy zeros will make it necessary to adjust the scaling if they were not considered before.

[61 1] 1 RIGHT HAND DUMMY ZERO [61 2] 2 RIGHT HAND DUMMY ZEROS [61 3] 3 RIGHT HAND DUMMY ZEROS [61 4] NO RIGHT HAND DUMMY ZEROS

CODE 62 - RATE CONVERSION FACTOR

Therate conversion factorprovides a simplemeans of obtainingthe desired rate reading,using the same Scale FactorValue as the counter, when the rateand count units are the same. In most applications, it is simply programmed to the desired time unit that the rate is to displayed in. See Appendix “F” - Scaling For Rate.

[62 1] Rate Per Second (x1) [62 2] Rate Per Minute (x60) [62 3] Rate Per Hour (x3600)

CODE 63 - RATE MINIMUM UPDATE TIME

The determination of the rate value uses a method in which the elapsed timeis measured between the first and last pulse of the update period. The minimum updatetime is theshortest the timeperiod can be. Once the minimumupdate time has expired, the unit will end the measurement period when the next negative goingcount edge occurs.If the unitdoes not receive the next negative countedge within the maximumupdate time at the start of the measurement period, the unit will end the time period and the rate display will go to zero. At very slow count rates the update time period will be the actual period of one count cycle.

[63 1] 0.5 Sec. minimum/1 Sec. maximum [63 2] 1 Sec. minimum/2 Secs. maximum [63 3] 2 Sec. minimum/4 Secs. maximum [63 4] 4 Sec. minimum/8 Secs. maximum [63 5] 8 Sec. minimum/16 Secs. maximum (max. rate = 7500 cps) [63 6] 16 Sec. minimum/32 Secs. maximum (max. rate = 3250 cps)

CODE 64 - RATE SCALE MULTIPLIER

The Rate Scale Multiplier is used in conjunction with the Rate Scale Factor A and Rate Conversion Factor to scale the actual signal input to obtain the desired reading. See Appendix “ F” - Scaling For Rate.

[64 1] x 1000 [64 2] x 100 [64 3] x10 [64 4] x1 [64 5] x0.1 [64 6] x0.01

CODE 65 - RATE (A) DECIMAL POINT & LEADING ZERO BLANKING

Thereare six basic modes of decimalpoint placement for the Rate indicator of the Gemini. The decimal point is placed to the right of the display digit that corresponds to the mode identifier. (The right most decimal point, digit 1, is never turned on.) A “-” sign in front of the mode identifier will inhibit leading zero blanking. The absence of a “ -” sign will enable leading zero blanking.

[65 1] 0 [65 2] 0.0 [65 3] 0.0 0 LEADING ZERO [65 4] 0.0 0 0 BLANKING [65 5] 0.0000 [65 6] 0.00000

[65 -1] 000000 [65 -2] 00000.0 [65 -3] 0 0 0 0.0 0 LEADING ZERO [65 -4] 0 0 0.0 0 0 BLANKING INHIBITED [65 -5] 00.0000 [65 -6] 0.00000

CODE 66 - “OPERATOR ACCESSIBLE FUNCTIONS” MODES

The Gemini has six b asic levels of “Operator Accessible Functions”. Each of these levels can be modified to enable or disable manual reset. When the “PGM. DIS.” (Program Disable) terminal is connected to “COMMON”, access to all functionsis disabledexcept for those listed belowwhich willremain enabled.All of the function codes and parameters can be interrogated, regardless of the “Operator Accessible Functions” mode selected.

A “-” sign in front of the mode identifier will disable the front panel Reset button and the “RST.” terminal.

Note: The front panel reset button can be independently disabled by using the

disable reset DIP switch.

[66 1]NO FUNCTIONS ENABLED EXCEPT RESET - In this mode, manual

reset is enabled, but none of the programming functions can be changed. [66 2] PRESET PROGRAMMING AND RESET ENABLED - In this mode,

manual reset and the programming of the Preset Values are enabled. [66 3] SCALE FACTOR PROGRAMMING AND RESET ENABLED - In this

mode,manualreset andthe programmingofthe ScaleFactor Valuesare enabled. [66 4] SCALE FACTOR, PRESET PROGRAMMING AND RESET

ENABLED - In this mode, manual reset and the programming of the Scale

Factor and Preset Values are enabled. [66 5] PRESET, COUNTER LOAD PROGRAMMING AND RESET

ENABLED - In this mode, manual reset and the programming of the Presets

and Counter Load Value are enabled. [66 6] PRESET, SCALE FACTOR, COUNTER LOAD PROGRAMMING

ANDRESET ENABLED -In this mode, manualreset andthe programmingof

the Presets, Scale Factors and Counter Load Value are enabled.

[66 -1] [66 -2] [66 -3] These modes are the same as above with the [66 -4] exception that manual reset is disabled. [66 -5] [66 -6]

PRESET VALUE

Whenever the display value equals the preset value (when output is assigned to that display channel), an output action will occur. This action depends on the previously programmed modes. The preset values may range from -999,999 to 999,999. (Refer to “Programming the Presets, Scale Factors, Timed Outputs & Counter Load Values” section for instructions on entering the preset values.)

TheCounter (B)Scale Factor,SFB, willhave adirect effecton thepreset value being entered (if assigned to the counter). For a Scale Factor Value greater than one,the preset value should be an integer multipleof the Scale Factor. If it is not, the Gemini will automaticallyadjust the preset value up or down to force it to be evenly divisible by the Scale Factor.

“1” - PRESET 1 VALUE “2” - PRESET 2 VALUE (GEMINI 4200 Only)

SCALE FACTORS A & B

“3” SCALE FACTOR - The Scale Factor, for which value (count or rate) is currently being displayed, is accessed b y pressing the “3” key. To access the Scale Factor of the “other” display v alue, the “+/-” key would be pushed (to change the display to the other value), then the “3” key would be pushed.

Thenumber of pulses counted (internal count value) ismultiplied by theScale Factor, which changes the displayed value accordingly. A Scale Factor Value of

1.0000 would result in a display of the actual number of input pulses that have been counted. The Scale Factor is used primarily for conversion from existing pulses per unit of measure to the required displayed units. This includes conversion from different units of measure (i.e feet to meters, etc.).

TheScale FactorValues mayrange from-5.9999 to +5.9999 (positive onlyfor Rate (A) Scale Factor, SFA). Refer to “ Programming the Presets, Scale Factors, Timed Outputs & Counter Load Values” section for entering instructions. It is important to note that the precision of a counter application cannot be improved by using a Scale Factor greater than one. To accomplish greater precision, more

pulseinformation mustbe generated per measuringunit. For example,if 5 pulses are being received per foot of material, the precision of 10th of feet cannot be attained by simply programming a Scale Factor of 2.0000, even though the displayis readingin 10ths. In this case,the displaywill incrementby two foreach count input. Thus if an odd Preset Value was entered, such as 6.7 ft., the Gemini will alter the preset to read in even tenths of feet.

Note: Use of a small Scale Factor in conjunction with a small scale multiplier

could cause the internal count value (counter) to be exceeded before the 6-digit display value is exceeded.

COUNTER LOAD VALUE

The Counter Load Value is provided to allow the user to modify the count value. The Counter Load Value is reset to zero when the Gemini is powered up. Once the Counter Load Value has been changed, it will remain set to that value untilthe unit is powered down and up. Accessing the Counter LoadValue for the counter that is currently being displayed is accomplished by pushing the “E” button, and while holding it down, also pushing the “+/-” button. See “Programming the Presets, Scale Factors, Timed Outputs & Counter Load Values” section for entering instructions.

“E” & “+/-” - Counter Load Value for the currently displayed counter.

DUAL PRESET COUNTER & RATE APPLICATION

A wire screen manufacturer requires a cut to length system, and in addition, a prewarning of an overspeed condition. The cutting machine is equipped with an existing 12 tooth gear, driving a one foot circumference feed roller.

The Gemini 4200’s counter is to read in feet. When 15,000 feet has been accumulatedon thetake uproll, the counteroutput isto turn onand deactivatethe drive system. The operator will then make the cut, load a new take up roll and reset the Gemini to start a new roll.

In addition to cut to length, the same Gemini 4200 is to be used to indicate the speed of the wire screen in feet per minute, while providing a “overspeed” warning. The normal running speed of the material is 225 feet per minute. The maximum allowable speed of the process is 250 feet per minute.

HARDWARE SETUP

The accompanying drawing shows how the hardware is setup for this application. A Model PSAC proximity sensor is used to sense the teeth on the gear. The application does not require bi-directional counting, so the Gemini 4200 will be programmed for the Count with Inhibit “Inputs 1 & 2 Response Mode”. In this mode, both the rate indicator and counter will utilize the same input signal. The switch settings and the wiring connections are as shown. The Input 2 switch positions 5-7 are set to put the Input 2 in the non-inhibit state with maximum noise immunity.

SCALING THE COUNTER

In order to scale the counter, the procedure and formulas in Appendix “E” Scaling for Counting are used.

In converting pulse units to “Display Units”, it is known that 12 pulses are equivalent to 1 revolution of the feed roll, which is equivalent to 1 foot linear travelof thewire screen. The “Display Unit”,therefore is1 foot andthe “Number of Pulses” per display unit is 12.

STEP 1 - Calculate the Total Scaling Factor, “K

”, using Formula #1 of

Appendix “E”.

= Display Unit / Number of Pulses

= 1/12 = 0.083333

STEP 2 - Determine the Number of Count Edges, “NCE”, necessary for this

application, and calculate the Remaining Scaling required, “K

”, using Formula #2 of Appendix “E”. Since the Total Scaling Factor, “K

”, is less than 1, single edge counting can

be used, therefore, the Number of Count Edges, “NCE”, is 1.

R=KT

/NCE

= 0.083333/1 = 0.083333

STEP3 -Determine the Scale Multiplier Value, “SCM”, and calculate the Scale

Factor, “SF”, using Formula #3 of Appendix “E”. A Scale Multiplier v alue of 0.1 is chosen to provide the maximum number of significant digits in the Scale Factor.

SF = K

/SCM

SF = 0.083333/0.1 = 0.8333

SCALING THE RATE INDICATOR

In this application the rate indicator can be programmed with the same scale factorand scale multiplier values asobtained when scaling the counter. The only other scaling that would be required is choosing the proper Rate Conversion Factor,to obtainthe display in the desiredtime units.The applicationcalls for the rate to be indicated in feet per minute, therefore, the Rate Per Minute Rate Conversion Factor is selected.

STEP BY STEPPROGRAMMING OF THE GEMINI 4200

STEP 1 - Enter code 41 (Unit Personality). Select and enter a mode identifier of

1, for the Gemini to operate as a Counter and Rate indicator. STEP2 - Enter code 42 (ResetButton & Terminal Actuation Modes).Select and

enter mode 2 to reset the counter when reset is activated. STEP3 -Enter code 43(Inputs 1& 2 ResponseModes). Selectand enter mode1,

“Count with Inhibit”. STEP 4 - Enter code 44 (Counter B Number of Count Edges). Select and enter

mode 1 for single edge counting. STEP5 -Enter code45 (Counter BScale Multiplier).Select and entermode 2for

a scale multiplier of 0.1. STEP 6 - Enter code 46 (Counter B Decimal Point & Leading Zero Blanking).

Select and enter mode 1 for no decimal point. STEP 7 - Enter code 51 (Output Assignment). Select and enter mode 1 to assign

Output 1 to the rate indicator and Output 2 to the counter. STEP8 - Enter code 52 (Output 1 TerminationModes). Select and enter mode 6

for boundary operation. Output 1 will activate when the maximum speed

value, Preset 1, is exceeded. Output 1 will deactivate when the rate decreases

to a value below the maximum speed.

Note: The Timed Output 1 Value, code 53, is not used in this application.

STEP9 - Enter code 54 (Output 2 TerminationModes). Select and enter mode 4

for Output 2 Terminate at Manual Reset.

Note: The Timed Output 2 Value, code 55, is not used in this application.

STEP 10 - Enter code 56 (Counter B Reset Modes). Select and enter mode 1 for

manual reset to zero.

STEP 11 - Enter code 61 (Rate Right Hand Dummy Zeros). Select and enter

mode 4 for no right hand dummy zeros.

STEP12 - Entercode 62 (Rate ConversionFactor). Select and entermode 2 fora

Rate Per Minute conversion factor.

STEP13 - Entercode 63 (Rate MinimumUpdate Time).Select and entermode 1

for a minimum update time of 0.5 Second. If the rate display jumps around, a larger minimum update time can be used to provide averaging.

STEP 14 - Enter code 64 (Rate Scale Multiplier). Select and enter mode 5 for a

Scale Multiplier of 0.1, as previously d etermined.

STEP15 - Enter code 65 (Rate DecimalPoint & Leading Zero Blanking). Select

and enter mode 1 for no decimal point.

STEP 16 - Enter code 66 (Operator Accessible Functions Modes). Select and

entermode (+)1 for no functions except reset enabled.When the “PGM.DIS.” terminal is connected to “COMM.”, the only changes that will be possible is resetting the counter.

STEP17 -The “+/-”key ispushed, ifnecessary, sothat therate isbeing indicated

on the Gemini 4200. The “3” key is then pushed to call up the Rate Scale Factor. The value is changed to 0.8333.

STEP 18 - The “+/-” key is pushed, so that the count is being indicated on the

Gemini 4200. The “3” key is then pushed to call up the Counter Scale Factor. The value is changed to 0.8333.

STEP19 - Entera Preset1 value of 250,by pushing the“1” key andchanging the

value to 250.

STEP20 - Enter aPreset 2 value of15,000, by pushing the “2” key and changing

the value to 15,000. After the unit is programmed, the “PGM. DIS.” terminal is connected to “COMM.” to p revent any unauthorized or accidental mode changes. The function codes can, however, be called up to view or verify that the proper modes are entered.

PROGRAMMING INSTRUCTIONS FOR THE DUALCOUNTER VERSIONOF THEGEMINI 4000

The first part of this section provides d etailed descriptions of the function commandcodes for input response modes, reset modes,output terminations, etc. Then, using an actual application example,the programming instructions for the Dual Counter version will be “walked through”, to give the user a full understanding of the Gemini 4000 programming procedure. The descriptions below give the function command code first, followed by the individual mode identifier. The Function Command Code Summary in the appendix, lists all codes. (Only commands and modes pertaining to the Dual Counter personality will be discussed in this section.)

CODE 41 - UNIT PERSONALITY

The Gemini can be programmed to operate in one of two different unit personalities. In each of the two personalities the Gemini operates as a dual function indicator. The personality selected determineswhether display channel A will indicate rate o r count. In both personalities, display channel B operates as a counter.

When the Unit Personality is changed and entered, all modes and data values (Presets, Scale Factors, function codes, etc.) will be automatically loaded with thefactory settings for thatpersonality. If, for anyreason during programming,it is desired to return to the factory settings, the “+/” key can be pushed while in code 41. Then, when the “E” key is pressed the unit will load the factory settings into the Gemini.

The programming procedures for the two unit personalities will vary. This entiresection dealswith theunit programmedasa DualCounter indicator,[41 2].

[41 1]COUNTER(B)/RATE(A) -In thismode, displaychannel Afunctions asa

rate indicator and display channel B functions as a counter. See

“PROGRAMMING INSTRUCTIONS FOR COUNTER/RATE VERSION

OF THE GEMINI” section for details. [41 2] DUAL COUNTER - In this mode, both display channels {A & B}

function as counters.

CODE 42 - RESET BUTTON & TERMINAL ACTUATION MODES

The “Reset Button & Terminal Actuation modes” control the affect that the

reset button and terminal have on the two display channels.

There is a separate “Rst A” terminal which resets Counter A, when activated.

It is provided to allow independent resetting of each channel.

[42 1] RESET COUNTER A [42 2] RESET COUNTER B [42 3] RESET COUNTER A & B

CODE 43 - INPUTS1&2RESPONSE MODES

The Gemini has six different input response modes. They are: Count(1) with Inhibit(2); Count(1) with Up/Down Control (2); Two input anticoincidence Add(1)/Subtract(2);Separate Input mode; Quadrature; and Quadrature x4. In all modes, except [43 4], both counters will respond identically to both inputs. These modes are most suitable for applications where one channel is used for control, and the other for totalizing counts.

[43 1] COUNTWITH INHIBIT- Input1 serves asthe countinput. Input 2 serves

as the Inhibit input. When Input 2 is low, the counters will ignore the count

signal appearing at Input 1. When Input 2 is at a high level, the pulses

appearing at Input 1 will be counted. [43 2] COUNT WITH UP/DOWN CONTROL - In this mode, count direction

can be controlled by the second input. Input 1 serves as the count input and

Input 2 serves as the direction control signal input. When Input 2 is at a high

level, the counters will count up. When Input 2 is at a low level, the counters

will count down. [43 3] TWO INPUT ANTICOINCIDENCE ADD/SUBTRACT - This mode

effectively separates count pulses which may simultaneously appear at the

two inputs. The Gemini unit processes the count pulses into a string of

time-separatedpulses, so the internalcounters willnot lose anycounts. Input1

serves as the add input (count increments) and Input 2 serves as the subtract

input (count decrements).

[43 4] SEPARATE INPUT - In this mode, the two counters, A & B, are

independently controlled by the inputs. Input 1 serves as the Counter A input and Input 2 serves as the Counter B input.

[43 5]QUADRATURE COUNTING - Quadrature counting modes are primarily

used in positioning and anti-jitter applications. The reason this mode works is due to the manner in which two pickups are positioned relative to each other. The signal on Input 2 is a pulse train signal shifted 90° away fromthe signal on Input 1. These two signals are processed by the Gemini as follows: Input 1 serves as the count input, while Input 2 serves as the quadrature input. Forquadrature with single edge counting, thecounters will count in a positive direction when Input 1 is a negative going edge and Input 2 is at a low level. Thecounters willcount ina negative directionwhen Input1 is apositive going edge and Input 2 is at a low level. All transitions on Input 1 are ignored when Input 2 is at a high level. These logic rules provide the basis for anti-jitter operation which will prevent false counts from occurring due to back-lash, vibration, chatter, etc. Whentwo edge counting is used, the quadrature mode works the same as with single edge counting when Input 2 is low. But when Input 2 is at a high level, counts at Input 1 are no longer ignored. Instead the logic rules for Input 1 are complemented,allowing bothedges of Input 1to be counted. Thisdoubles the effective resolution of the encoded input.

[43 6] QUADRATURE TIMES 4 - This mode takes the quadrature mode, with

two edge counting, one step further. In quadrature times 4, both Input 1 and Input2 serve as the count or quadrature input, depending on their state. In one instance, Input 1 will serve as the count input and Input 2 will serve as the quadrature input. In another instance, Input 1 will be the quadratureinput and Input 2 will be the count input. This enables each edge, positive and negative going, of both inputs, 1 and 2, to be counted. This results in a resolution four times greater than in the basic quadrature x1 mode.

CODE 44 - COUNTERS A & B NUMBER OF COUNT EDGES

The counters of the Gemini can be programmed for either single or two edge (x2) counting. The number of count edges cannot be set when the count mode is programmedfor quadrature x4 operation. The Gemini will ignore any attempt to enter function command code 44, when set for quadrature x4.

[44 1] SINGLE EDGECOUNTING (x1) - Theunit counts on the negative going

(falling) edge of the count input signal. The Inputs 1 & 2 Response mode

descriptions describe how each mode uses this method of edge counting. [44 2]TWO EDGE COUNTING (x2) - This mode is used when doubling of the

count signal input is required. The unit counts on the positive going (rising)

edge of the count input signal, as well as, the negative going (falling) edge.

CODE 45 - COUNTER B SCALE MULTIPLIER

There are four “Counter B Scale Multipliers” that are available. They effectivelydivide theinternal count Bvalue by1, 10, 100,and 1000 respectively, to yield the displayed Counter B value. Note: Use of a small scale multiplier in conjunction with a small Scale Factor could cause the internal count value to be exceeded before the 6-digit display v alue is exceeded. See “Programming the Presets, Scale Factors, Timed Outputs & Counter Load Values” section for more details.

[45 1] x1 [45 2] x0.1 [45 3] x0.01 [45 4] x0.001

CODE 46 - COUNTER B DECIMALPOINT & LEADING ZERO BLANKING

There are six basic modes of decimal point placement for Counter B of the Gemini. The decimal point is placed to the right of the display digit that corresponds to the mode identifier. (The right most decimal point, digit 1, is never turned on.) A “-” sign in front of the mode identifier will inhibit leading zero blanking. The absence of a “-” sign will enable leading zero blanking.

[46 1] 0 [46 2] 0.0 [46 3] 0.0 0 LEADING ZERO [46 4] 0.0 0 0 BLANKING [46 5] 0.0000 [46 6] 0.00000

[46 -1] 000000 [46 -2] 00000.0 [46 -3] 0 0 0 0.0 0 LEADING ZERO [46 -4] 0 0 0.0 0 0 BLANKING INHIBITED [46 -5] 00.0000 [46 -6] 0.00000

CODE 51 - OUTPUT ASSIGNMENT

The output of the Gemini 4100 is assigned to Counter B, or for the Gemini 4200one canbe assigned toCounter B and the otherto Counter A.When bothare assigned to Counter B, the Gemini will automatically configure the Counter A Reset Mode to Reset to Zero, [61 1].

The Gemini 4200 has a Preset tracking feature which allows Preset 1 to track Preset2. If Presettracking is programmed,whenever the Preset 2 value ischanged, the Preset 1 value will also change to maintain the same offset. For example, if Preset 1 is 100 and Preset 2 is 200, changing Preset 2 to 300 will automatically changePreset 1 to200, maintainingthe same100 unit offset. Inorder to changethe amount of offset, the Preset 1 value is changed. The Preset tracking feature is programmed by adding a “-” modifier in front of the desired mode.

[51 1] OUTPUT1 ASSIGNED TOCOUNTER A, OUTPUT 2 ASSIGNEDTO

COUNTER B (Gemini 4200 Only)

[51 2] OUTPUT 1 & 2 ASSIGNED TO COUNTER (B)

CODE 52 - OUTPUT 1 TERMINATION MODES

The Gemini has six “Output Termination Modes”, which control the way Output 1 will terminate or reset. In all modes, Output 1 will terminate immediately when the counter to which it is assigned is manually reset.

Output 1 termination modes 1 & 2 are available only with a Gemini 4200 and when both outputs are assigned to Counter B, [51 2].

A reverse phase mode is available on the Gemini. This refers to the complementing of the logic state of the output. With normal phase operation, when the display value reaches the Preset 1, Output 1 will turn on. The reset conditionof Output 1 isoutput off. In reverse phaseoperation, the Output 1 turns off when the Preset 1 is reached. The reset condition of Output 1 is output on. (Note: The state of the relay, if used, is also reversed.) A “-” sign in front of the mode identifier will provide for reverse phase operation. The absence of a “-” sign will indicate normal phase operation.

[52 1] TERMINATE AT OUTPUT 2 START - Output 1 will terminate when

Output2 starts.Output 1is setfor normalphaseoperation. (Gemini4200 Only) [52 2] TERMINATE AT OUTPUT 2 END - Output 1 will terminate when

Output2 ends.Output 1is setfor normalphaseoperation. (Gemini4200 Only) [52 3] TERMINATE AT MANUAL RESET - Output 1 activates when the

Counter A or Counter B value, whichever it is assigned to, is greater than or

equal to the Preset 1 Value. In this mode, once Output 1 is activated, it does

not deactivate until the moment a reset occurs. Output 1 is set for normal

phase operation. [52 4] TERMINATE AT MANUAL RESET END - This mode is like the

preceding, except Output 1 deactivates when reset ends. Output 1 is set for

normal phase operation.

[52 5] TERMINATE AFTER TIMED OUTPUT 1 - Once the output has been

activated, it will deactivate after the predetermined length of time (code 53) has expired. Manual reset will override the timed output and reset Output 1. Output 1 is set for normal phase operation.

[52 6]BOUNDARY MODE - When in boundary mode, the Preset 1 Value serves

asthe boundary point.When the CounterA or BValue (whichever itis assigned to) is less than Preset 1, Output 1 is not activated (normal phase). When the CounterA orB Value is greater thanor equalto Preset 1,Output 1is activated. If the Counter A or B Value were to drop below Preset 1, Output 1 would then deactivate. For negative Preset points, Output 1 is not activated when the CounterA orB Value ismore positivethat the Preset1 Value. Whenthe count is more negative than or equal to Preset 1, Output 1 is activated. If the count becomes more positive than Preset 1, Output 1 again deactivates. When the Preset 1 value is changed, Output 1 will immediately go to the proper state. Upon power up, Output 1 will “remember”its power down boundary condition and go to that state. Output 1 is set for normal phase operation. Programming Boundarymodewill automaticallyselect [61 1]when [51 1] isprogrammed.

[52 -1] [52 -2] [52 -3] These modes are the same as above with the exception [52 -4] that the output is set for reverse phase operation. [52 -5] [52 -6]

CODE 53 - TIMED OUTPUT 1 VALUE

Note: ATimed Output Value of zero cannot be programmed into the Gemini. If a

value of 0 is entered into the display and the “E” key is pressed, the unit will

not enter the 0, but will stay in the data entry mode. If a new value is not

entered, it willtime out and the unitwill continue touse its previous setting.

CODE 54 - OUTPUT 2 TERMINATION MODES

The Gemini 4200 has six “Output 2 Termination Modes”, which control the way Output 2 will terminate or reset. In all modes, Output 2 will terminate immediately when Counter B is manually reset.

Output 2 termination modes 1 & 2 are available only when both outputs are assigned to Counter B, [51 2].

A reverse phase mode is available on the Gemini 4200. This refers to the complementing of the logic state of the output. With normal phase operation, when the display value reaches the Preset 2, Output 2 will turn on. The reset conditionof Output 2 isoutput off. In reverse phaseoperation, the Output 2 turns off when the Preset 2 is reached. The reset condition of Output 2 is output on. (Note: The state of the relay, if used, is also reversed.) A “-” sign in front of the mode identifier will provide for reverse phase operation. The absence of a “-” sign will indicate normal phase operation.

[54 1] TERMINATE AT OUTPUT 1 START - Output 2 will terminate when

Output 1 starts. Output 2 is set for normal phase operation.

[54 2] TERMINATE AT OUTPUT 1 END - Output 2 will terminate when

Output 1 ends. Output 2 is set for normal phase operation.

[54 3]TERMINATE AT MANUAL RESET - Output 2 activates when Counter

B is greater than or equal to the Preset 2 Value. In this mode, once Output 2 is

activated,it does notdeactivate until themoment a reset occurs. Output 2 is set

for normal phase operation.

[54 4] TERMINATE AT MANUAL RESET END - This mode is like the

preceding, except Output 2 deactivates when reset ends. Output 2 is set for

normal phase operation.

[54 5] TERMINATE AFTER TIMED OUTPUT 2 - Once Outp u t 2 has been

activated, it will deactivate after the predetermined length of time (code 55)

has expired. Manual reset will override the timed output and reset Output 2.

Output 2 is set for normal phase operation.

CODE 54 - OUTPUT 2 TERMINATION MODES (Cont’d)

[54 6] BOUNDARY MODE- When in boundary modethe Preset 2Value serves

asthe boundary point. When the Counter B Valueis less than Preset 2, Output 2is not activated (normal phase).When the Counter B Value isgreater than or equal to Preset 2, Output 2 is activated. If the Counter B Value were to drop below Preset 2, Output 2 would then deactivate. For negative Preset points, Output 2 is not activated when the Counter B Value is more positive that the Preset 2 Value. When the count is more negative than or equal to Preset 2, Output2 is activated.If the countbecomes morepositive thanPreset 2, Output 2 again deactivates. When the Preset 2 value is changed, Output 2 will immediatelygo tothe proper state. Upon power up, Output 2 will“remember” its power down boundary condition and go to that state. Output 2 is set for normal phase operation. Programming Boundary mode will automatically select [56 1].

[54 -1] [54 -2] [54 -3] These modes are the same as above with the exception [54 -4] that the output is set for reverse phase operation. [54 -5] [54 -6]

CODE 55 - TIMED OUTPUT 2 VALUE (GEMINI 4200 ONLY)

TheGemini 4200has the capabilityof varying theTimed Output2 Value from

Note: ATimed Output Value of zero cannot be programmed into the Gemini 4200.

If avalue of 0 is entered into the display and the “E” key is pressed, the unit will not enterthe 0, but will stayin thedata entry mode. If anew valueis not entered, it will time out and the unit will continue to use its previous setting.

CODE 56 - COUNTER B RESET MODES

The Gemini has six different Counter B reset modes. Note: For Gemini 4200 all reset to preset modes reset to preset 2. There are also two methods by which manual reset can act on the counter (reset must be enabled, see function code 66 and dip switch set-up). The first is a “maintained” reset action, where the unit is held at reset for as long as the reset terminal or reset button is activated. The second is a “momentary” reset, in which the unit resets, when reset is activated, and starts counting even though the reset terminal or reset button may still be active. A “-” sign in front of the mode identifier indicates “momentary” reset action, the absence of the “-” sign indicates “maintained” reset action.

In“Reset to Zero” modes theOutput activates at the PresetValue. In “Reset to Preset” modes, the Output activates at zero.

In the “Reset to Preset” modes, for proper operation, the counter normally counts down. In the “Count with Inhibit” and “ Separate Inputs” input response modes, [43 1, or 4], the unit will automatically count down if a Reset to Preset mode is selected. In the other input response modes, proper input phasing is required for down counting. See “CODE 43 - INPUTS 1 & 2 RESPONSE MODES” section for details.

The activation and de-activation response time for reset is 10 msec. [56 1] MANUAL RESET TO ZERO (RTZ) - Manual reset to zero is

accomplished by pulling the “RST.” terminal to “COMMON” or, if the front

panel reset is enabled, by pressing the front panel reset button. Reset is

“maintained”. [56 2] MANUAL RESET TO PRESET (RTP) - Manual reset to Preset is

accomplished by pulling the “RST.” terminal to “COMMON” or, if the front

panel reset is enabled, by pressing the front panel reset button. Reset is

“maintained”. [56 3] AUTOMATIC RESET TO ZERO AFTER TIMED OUTPUT - The

counterautomatically resets to zero when TimedOutput ends. Manual reset is

“maintained” and will override automatic reset. [56 4] AUTOMATIC RESET TO PRESET AFTER TIMED OUTPUT - The

counter automaticallyresets to Preset when TimedOutput ends. Manual reset

is “maintained” and will override automatic reset.

[56 5] AUTOMATIC RESET TO ZERO AT BEGINNING OF TIMED

OUTPUT (AT PRESET) - In this reset mode, the counter will automatically reset to zero at the beginning of Timed Output (at Preset). The Timed Output Value must be shorter than the time required for the counter to count to the Preset 2 Value, otherwise, the Output will appear to be latched on. Manual reset is “maintained” and will override automatic reset.

[56 6] AUTOMATIC RESET TO PRESET AT BEGINNING OF TIMED

OUTPUT(AT ZERO)- Inthis reset mode,the counterwill automaticallyreset to Preset at the beginning of Timed Output (at zero).The Timed Output Value must be shorter than the time required for the counter to count to zero, otherwise, the Output will appear to be latched on. Manual reset is “maintained” and will override automatic reset.

[56 -1] [56 -2] [56 -3] These modes are the same as above with the exception [56 -4] that manual reset is set for “momentary” operation. [56 -5] [56 -6]

CODE 61 - COUNTER (A) RESET MODES

There are two ways to reset Counter A. The reset button or “RST.” terminal can be used, if the appropriate “Reset Button & Terminal Activation Mode” is programmed. The second way is the use of the “RST.A” terminal. If it is necessary to reset Counter A & B independently, the “Reset Button & Terminal Activation Mode” should be programmedto Reset Counter B, and the “RST.A” terminal should then be used to reset Counter A.

For the Gemini 4200, if both outputs are assigned to Counter B [51 2], or the Output 1 Termination mode is boundary [54 6], the only Counter A Reset mode that is available is Reset to Zero [61 1].

Thereare twomethodsby which manualresetcan act onCounter A(reset must be enabled - see function code 66 and dip switch set-up). The first is a “maintained” reset action, where the unit is held at reset for as long as the reset terminalor reset button is activated. Thesecond is a “momentary”reset, inwhich the unit resets, when reset is activated, and starts counting even though the terminal or reset button may still be active. A “-” sign in front of the mode identifier indicates “momentary” reset action, the absence of the “ -” sign indicates “maintained” reset action.

The activation and de-activation response time for reset is 10 msec.

[61 1] MANUAL RESET TO ZERO (RTZ) - Manual reset to zero is

accomplished by activating the appropriate reset button or terminal. Reset is “maintained”.

The following modes are only available on the Gemini 4200

[61 2] MANUAL RESET TO PRESET 1 (RTP) - Manual reset to Preset 1 is

accomplished by pulling the “RST.” terminal to “COMMON” or, if the front panel reset is enabled, by pressing the front panel reset button. Reset is “maintained”.

[61 3] AUTOMATIC RESET TO ZERO AFTER TIMED OUTPUT 1 - The

counter automaticallyresets to zero when Timed Output 1 ends. Manual reset is “maintained” and will override automatic reset.

[61 4] AUTOMATIC RESET TOPRESET 1 AFTER TIMED OUTPUT1 - The

counter automatically resets to Preset 1 when Timed Output 1 ends. Manual reset is “maintained” and will override automatic reset.

[61 5] AUTOMATIC RESET TO ZERO AT BEGINNING OF TIMED

OUTPUT 1 (AT PRESET 1) - In this reset mode, the counter will automatically reset to zero at the beginning of Timed Output 1 (at Preset 1). TheTimed Output 1 Value(code 53)must beshorter than thetime required for thecounter tocount tothe Preset1 Value,otherwise, Output1 willappear tobe latched on. Manual reset is “maintained” and will override automatic reset.

[61 6] AUTOMATIC RESET TO PRESET 1 AT BEGINNING OF TIMED

OUTPUT 1 (AT ZERO) - In this reset mode, the counter will automatically reset to Preset 1 at the beginning of Timed Output 1 (at zero). The Timed 1 Output Value (code 53) must be shorter than the time required for the counter tocount to zero, otherwise, Output1 will appear to belatched on. Manualreset is “maintained” and will override automatic reset.

[61 -1] [61 -2] [61 -3] These modes are the same as above with the exception [61 -4] that manual reset is set for “momentary” operation. [61 -5] [61 -6]

CODE 64 - COUNTER A SCALE MULTIPLIER

There are four Counter A scale multipliers that are available. They effectively dividethe internal CounterA Value by1, 10, 100,and 1000 respectively,to yield the displayed Counter A Value. Note: Use of a small scale multiplier in conjunction with a small Scale Factor could cause the internal Counter A Value to be exceeded before the 6-digit display value is exceeded.

[64 1] x1 [64 2] x0.1 [64 3] x0.01 [64 4] x0.001

CODE 65 - COUNTER A DECIMAL POINT & LEADING ZERO BLANKING

There are six basic modes of decimal point placement for Counter A of the Gemini. The decimal point is placed to the right of the display digit that corresponds to the mode identifier. (The right most decimal point, digit 1, is never turned on.) A “-” sign in front of the mode identifier will inhibit leading zero blanking. The absence of a “-” sign will enable leading zero blanking.

[65 1] 0 [65 2] 0.0 [65 3] 0.0 0 LEADING ZERO [65 4] 0.0 0 0 BLANKING [65 5] 0.0000 [65 6] 0.00000

[65-1] 000000 [65-2] 00000.0 [65-3] 0 0 0 0.0 0 LEADING ZERO [65-4] 0 0 0.0 0 0 BLANKING INHIBITED [65-5] 00.0000 [65-6] 0.00000

CODE 66 - “OPERATOR ACCESSIBLE FUNCTIONS” MODES

The Gemini has six basic levels of “Operator Accessible Functions”. Each of these levels can be modified to enable or disable manual reset. When the “PGM. DIS.” (program disable) terminal is connected to “COMMON”, access to all functionsis disabledexcept for those listed belowwhich willremain enabled.All of the function codes and parameters can be interrogated, regardless of the “Operator Accessible Functions” mode selected.

A “-” sign in front of the mode identifier will disable the front panel Reset button and the “RST.” terminal.

Note: The front panel reset button can be independently disabled by using the

disable reset DIP switch.

[66 1] NO FUNCTIONS ENABLED EXCEPT RESET - In this mode, manual

reset is enabled, but none of the programming functions can be changed. [66 2] PRESET PROGRAMMING AND RESET ENABLED - In this mode,

manual reset and the programming of the Preset Values are enabled. [66 3] SCALE FACTOR PROGRAMMING AND RESET ENABLED - In this

mode,manualreset andthe programmingofthe ScaleFactor Valuesare enabled. [66 4] SCALE FACTOR, PRESET PROGRAMMING AND RESET

ENABLED In this mode, manual reset and the programming of the Scale

Factor and Preset Values are enabled. [66 5] PRESET, COUNTER LOAD PROGRAMMING, AND RESET

ENABLED - In this mode, manual reset and the programming of the Presets

and Counter Load Values are enabled. [66 6] PRESET, SCALE FACTOR, COUNTER LOAD PROGRAMMING,

ANDRESET ENABLED -In this mode, manualreset andthe programmingof

the Preset, Scale Factor and Counter Load Values are enabled.

[66 -1] [66 -2] [66 -3] These modes are the same as above with [66 -4] the exception that reset is disabled. [66 -5] [66 -6]

PRESET VALUES

Whenever the display value equals the preset value, an output action will occur. This

action depends on the previously programmed modes. The preset values may vary from

-999,999to 999,999. (Referto “Programmingthe Presets,Scale Factors, TimedOutputs & Counter Load Values” for instructions on entering the preset values.)

TheScale Factorwill havea directeffect on thepreset valuebeing entered.For aScale FactorValue greater than one, the preset value should be an integer multiple of the Scale Factor. If it is not, the Gemini will automatically adjust the preset value up or down to force it to be evenly divisible by the Scale Factor.

“1” - PRESET 1 VALUE “2” - PRESET 2 VALUE (GEMINI 4200 Only)

SCALE FACTORS A & B

“3” SCALE FACTOR - The Scale Factor, for the Value (Counter A or Counter B) thatis currently beingdisplayed, is accessedby pressing the “ 3” key. To accessthe Scale Factorof the “other”display value, the“+/-” keywould be pushed (tochange the d isplay to the other value), then the “3” key would be pushed.

Thenumber ofpulses counted (internal countvalue) is multipliedby the ScaleFactor, which changes the displayed value accordingly. A Scale Factor Value of 1.0000 would resultin a display ofthe actual numberof input pulses that havebeen counted. The Scale Factor is used primarily for conversion from existing pulses per unit of measure to the required displayed units. This includes conversion from different units of measure (i.e feet to meters,etc.). The Scale Factor Values may range from-5.9999 to +5.9999. Refer to “Programmingthe Presets, Scale Factors, Timed Output & Counter Load Values” for entering instructions.

Itis important to note that the precision of a counter application cannot be improved by using a Scale Factor greater than one. To accomplish greater precision, more pulse information must be generated per measuring unit. For example, if 5 pulses are being received per foot of material, the precision of 10th of feet cannot be attained by simply programminga Scale Factor of 2.0000,even though the display is reading in 10ths. In this case, the display will increment by two for each count input. Thus if an odd preset value wasentered, suchas 6.7ft., theGemini willalter thepreset toread in even tenths offeet.

Note: Useof a small Scale Factor in conjunction with a small scalemultiplier couldcause

the internal count value to be exceeded before the 6-digit display value is exceeded.

COUNTER LOAD VALUES

The Counter Load Value is provided to allow the user to modify the Counter A or B values. The Counter Load Values are reset to zero when the Gemini is powered up. Once the Counter Load Value has been changed,it willremain setto that v alue until theunit ispowered down and up. Accessing the Counter Load Value for the counter that is currently being displayed is done by pushing the “E” button and while being held down also pushing the “+/-” button.

“E”& “+/-” -Counter LoadValue for the currentlydisplayed counter.

DUAL COUNTER BATCHING APPLICATION

Atypical application for theGemini 4200 willrequire a slow down output and a final cut output for cut. In this application the user also desires a total count of pieces cut per shift, or per order. The Gemini 4200 can easily be programmed to handle these requirements.

A manufacturer of cardboard packaging inserts needs to cut various length cardboard inserts to a 32ndth of an inch tolerance. To achieve this accuracy, an RPGB 1200 coupled to a length sensor conversion bracket and a 1 foot circumferencewheel will be used. The sensor will provide 1200 pulses per foot or 100pulses perinch. Thiswill enablethe cutbe madeto 100thof aninch accuracy.

Thelength of the cardboard insert will vary from run to run, however the slow down output needs to occur 5 inches before the final cut is to be made. This requirement can be handled easily with the Gemini 4200’s preset tracking feature. The Preset 1 value is initially programmed to be 5 inches less than the Preset2 value. (Preset 2 must be programmedfirst.) Then whenever thelength of the cardboard insert is changed (Preset 2), the Gemini will automatically adjust Preset 1 to be 5 inches less than the new Preset 2 value.

Thelast requirementis tototalize the numberof piecescut. This isachieved by using the output cut pulse at “O2 SNK”, as an input count pulse to Input 1 of the Gemini4200. TheInputs 1& 2 Responsemode of the unit wouldbe programmed to the “Separate Inputs” mode. Then, whenever a cut is made, the Gemini would increment Counter A to provide a total count of pieces cut.

HARDWARE SET-UP

The application drawing shows how the hardware for this system is to be connected.

The normally open contact of relay 1 is connected to the slow down actuator. The normallyopen contact of relay 2 is connected to the knife actuator. The “O2 SNK”output is connected to Input1, which will provide ainput pulse to Counter A each time a piece is cut.

The Dip switches are setup as shown. Input 1 is set-up to work with an open collectoroutput. Thenumber of piecescut will befar less than100/ sec. therefore the “HI/LO FRQ” switch for Input 1 is placed in the “LO FRQ” position for higher noise immunity. Input 2 is also set-up to work with an open collector output. The “HI/LO FRQ” switch is placed in the “HI FRQ” position since the count frequencies involved will be over 100 cps. The “EN/DIS RST” switch (8), is set to “EN RST” to allow front panel reset.

SCALING FOR COUNTER A

Counter A is used to totalize the number of pieces cut. There is 1 pulse provided for each piece cut. Counter A, therefore, does not require special scaling.The Gemini4200 issimply leftat its factorysettings of 1 for ScaleFactor A and Scale Multiplier A.

SCALING FOR COUNTER B

Counter B is used to control the length of the cardboard insert. The display reading for Counter B is to be in hundredths of an inch. The “Numberof Pulses” per 1200 “Display Units” (1200 hundredths of an inch = 1 foot) is 1200. It can easily be seen that 1 pulse will provide for 1 “Display Unit” of indication (1 hundredthof an inch).The Gemini 4200 can therefore beleft at itsScale Factor B and Scale Multiplier B factory settings of 1. The “Counter A & B Number of Count Edges”, code 44, is also left at the factor set value of 1.

STEP BY STEPPROGRAMMING OF THE GEMINI 4200

STEP1 -Enter code41 (UnitPersonality). Select andenter mode2 toset theUnit

Personality to Dual Counter. STEP 2 - Enter code 42 (“Reset Button & Terminal Actuation Mode”). Select

andenter mode 2 soreset will reset CounterB. This will allow CounterB to be

reset when the front panel reset button is pushed. STEP3 -Enter code 43 (“Inputs 1& 2 ResponseModes”). Selectand entermode 4

forSeparateInputs mode(Input 1= CounterA input,Input 2= CounterB input). STEP4 - Enter code 44 (“Counters A& B Number of Count Edges”).Select and

enter mode 1 for single edge counting. STEP5 -Enter code45 (Counter BScale Multiplier).Select and entermode 1for

a scale multiplier of 1. STEP 6 - Enter code 46 (Counter B Decimal Point & Lead Zero Blanking).

Select and enter mode 3 for a decimal point in the hundredths location. STEP 7 - En ter code 51 (Output Assig n ment). Select and enter mode (-)2 to

assign both outputs to Counter B and enable preset tracking. STEP8 - Enter code 52 (Output 1 TerminationModes). Select and enter mode 2

for termination at Output 2 end.

Note: The Timed Output 1 Value, code 53 is not used in this application.

STEP9 - Enter code 54 (Output 2 TerminationModes). Select and enter mode 5

for timed output operation. STEP 10 - Enter code 55 (Timed Output 2 Value). Change the value to 0.50 and

enter. STEP 11 - Enter code 56 (Counter B Reset Modes). Select and enter mode 5 for

AutomaticResettoZeroatPreset2.

Note: Code 61 (Counter A Reset Modes) was automatically selected to mode

1, Reset to Zero, when mode [51 2] was programmed.

STEP 12 - Enter code 64 (Counter A Scale Multiplier). Select and enter mode 1

for a scale multiplier of 1.

STEP 13 - Enter code 65 (Counter A Decimal Point & Leading Zero Blanking).

Select and enter mode 1 for no decimal point.

STEP 14 - Enter code 66 (Operator Accessible Functions Modes). Select and

enter mode 2 for Preset programming and reset enabled. When the “PGM.DIS.”terminal isconnected to“COMM.”, the onlychanges thatwill be possible are resetting the unit and changing the Preset.

TheGemini4200 in nowfully programmed.Jumperthe “PGM.DIS.”terminal to“COMM.” to prevent accidental program changesand to enable the “Operator Accessible Functions”.

20 MA CURRENT LOOP COMMUNICA TIONS

The Gemini 4000’s 20 mA Current Loop Communications Option allows a “two-way” serial communications link to be established in order to monitor the count, rate, Presets and Scale Factors from a remote location. Some typical devices that can be connected with the Gemini are: a printer, terminal, programmablecontroller, or host computer. For devices that use RS232, a GCM Serial Converter Module is available to convert the 20 mACurrent Loop signals to RS232 and vice-versa.

There are two loops that must be established. One for sending commands to the Gemini and one for receiving the data values from the Gemini. Up to sixteen Geminis can be connected together in the “loop”. These units are assigned unit addresses by setting the Serial DIP Switches on each unit. The applications can beas simple as attachinga printer to obtain hard copy of the count informationor asinvolved as usinga host computerto automaticallyset up thePresets and Scale Factors of a number of Gemini units.

With the Serial Loop Option, the following functions can be performed:

1. Interrogation of the Count, Rate, Presets, and Scale Factors.

2. Changing of the Presets and Scale Factors.

3. Resetting of the Count values.

4. Automatic print-out when using a printer and the Print Request Terminal.

5. Change viewed display channel.

COMMUNICATION FORMAT

Datais sentby switchingoff and onthe currentin the20 mAcurrent loop.Data isreceived by monitoring the switching action and interpreting the codes thatare transmitted. In order for data to be interpreted correctly, there must be identical formats and Baud Rates. The format that the Gemini will accept is: 1 start bit, 7 data bits, 1 odd parity bit, and 1 stop bit. The Baud Rates that are available are: 300, 600, 1200 and 2400.

Theselection of theBaud Rate is accomplishedby setting DIPswitches. Refer to the Current Loop Installation section, for set-up instructions.

SENDING COMMANDS & DATATO THE GEMINI

When sending commands to the Gemini, a command string must be constructed. The command string may consist of command codes, value identifiers,and numerical data. B elow is a list of commandsand valueidentifiers that are used when communicating with the Gemini.

COMMAND DESCRIPTION

N (4EH) Address command; followed by a unit address number 1-15

and one of the following commands. P (50H) Transmit per Print Options command. R (52H) Reset command; operates on Count values and output T (54H) Transmit Value command; operates on Rate orCount values,

Preset and Scale Factors. V (56H) Change Value command; operates on Scale Factors, and the

Preset. D (44H) ChangeDisplay command;operateson Displayvalues E& F.

VALUE

IDENTIFIER

DESCRIPTION MNEMONIC

A (41H) Preset 1 (PS1) B (42H) Preset 2 (PS2) C (43H) Scale Factor A (SFA) D (44H) Scale Factor B (SFB) E (45H) Rate or Count A (CTA) F (46H) Count B (CTB)

FIG. 1: DATA FORMAT-10 BIT FRAME [300, 600, 1200, 2400 Baud]

The command string is constructed by using the above commands and value identifiers along with the data values that are required. Data values may or may not contain the decimal point if a decimal point is programmed into the Gemini. TheGemini will accept thedecimal points, however, it does not interpret themin any way. Leading zeros can be eliminated, however, all trailing zeros must be present. For example, if a Scale Factor of 1.0000 is to be sent, the data value can betransmitted as 1.0000or 10000. If a“1” is transmitted, the Scale Factor willbe changed to 0.0001.

TheAddress command is used to allow a command to be directed to a specific unit in the Serial Communications Loop. Whenever the unit address is zero, transmission of the Address command is not required. This is done for applications which do not require more than one Gemini. For applications that require several units, it is recommended that each Gemini in the loop be given a separate address. If they are given the same address, a command such as the Transmit Value Command, will cause all the units to respond at the same time, resulting in erroneous data.

Thecommand stringis constructed in aspecific logical sequence. The Gemini will not accept command strings that do not follow this sequence. Only one operation can be performed per command string. Below is the procedure to be used when constructing a command string.

1.If the Gemini, to which the commandis to be sent, is assigned an address other

than zero, the first two characters of the command string must consist of the

Address Command (N) and the address number of the unit (1-15).

2. The next characters in the command string is the actual command that the

Geminiis to performand the value identifier if it pertains to the command. (A

command such as the Transmit per Print Options, “P”, command does not

require a Value Identifier.)

3. If the “Change Value” command is being used, the next characters in the

command string is the numerical data value.

4. The last character in the command string is the command terminator (*). This

character must be sent in order to tell the Gemini that the command string is

complete, so that they can begin processing the command.

Below are some typical examples of properly constructed command strings. (EX. 1) Change Preset 1 on the Gemini with address of 2 to 00123.4.

COMMAND STRING: N2VA1234*

(EX. 2) Have the Gemini with address of 3 transmit the Count B value.

COMMAND STRING: N3TF*

(EX. 3) Reset Counter B of the Gemini with address of 0.

COMMAND STRING: RF*

As shown, all commands must be terminated with a “Command Terminator” (* or 2AH). The Gemini will not process the command until the terminator is sent. If illegal commands or characters are sent to the Gemini, they still would needto be terminatedby an (*).If they are n ot terminated, thenext commandwill not be accepted.

When writing application programs in Basic, the transmission of spaces or carriagereturn andline feed shouldbe inhibited byusing the semicolondelimiter with the “PRINT” statement. The Gemini will not accept a carriage return or line feed as valid characters.

When a “Change Value” command is sent to the Gemini, a short amount of timeis requiredfor the unitto process thedata. This timeincreases withthe count rate. During this time, only one additional commandmay be sent to the Gemini. Thismaybedone80msecafterthetransmissionofthe“ChangeValue” command.After the second commandhas been transmitted, the unit will ignore any further commands until 10 msec after both the “Change Value” and second command have been processed. It is recommended that a “Transmit Value” command follow a “Change Value” Command. If this is done, the reception of the data can provide a timing reference fo r sending another command and will insure that the change has occurred.

SENDING COMMANDS & DATATO THE GEMINI (Cont’d)

The timing diagrams show the timing considerations that need to be made.

RECEIVING DATA FROM THE GEMINI

Data is transmitted from the Gemini when a “Transmit Value” or “Transmit per Print Options” command is sent to the unit, or when the “PRINT REQ.” terminal is activated. The Gemini can transmit 6 values: display channel A, displaychannel B, Preset1, Preset 2, ScaleFactor A, andScale Factor B. A list of theabbreviations usedwhen theGemini transmitsthevalues areshown below.

CTA - Counter A or Rate A Value

CTB - Counter B Value

PS1 - Preset 1

PS2 - Preset 2

SFA - Scale Factor A

SFB - Scale Factor B

A typical transmission,with the “PR. ID” (Print ID) switch in the up position,

is shown below.

The first two digits transmitted are the unit address followed by two blank spaces.If the unit address is 0, thefirst locations will be left blank. The next three lettersare the abbreviation for the mnemonicvalue followed by one blank space. The actual values are transmitted last. Negative values are indicated by a “-” sign. For positive values, the “+” sign is not transmitted. Overflowed count values are s hown by an asterisk preceding the most significant digit of the value. The decimal point position will “float” within the data field depending on the actual value it represents.

For peripheral control purposes, a single line transmission will have a <CR> attachedto theend of theabove string.For a“T” command or each lineof a block transmission, only the above character string is sent. For the last line of a block transmission, a <SP> <CR> <LF> is attached to the end of the above character string. An example of a typical serial transmission:

3 CTB -1234.56 < CR> < LF>

If the “Print Request” terminal initiates the transmission, a 400 msec delay is inserted before the transmission to keep multiple transmissions from overrunning the printer.

When the Print ID switch is in the down position, the unit willnot transmit the characters before the data value (address, Value ID, spaces) or the 400 msec printer delay. The same above value when transmitted with the “PR.ID” switch in the down position, is transmitted as:

-1234.56 < CR> < LF>

Note: When using the Gemini with a printer, with the “Print ID” switch in the

down position, some printers may not work, since the printer delay is not

transmitted.

FIG. 2: TIMING FOR SENDING COMMANDS

(**) This is the time that it takes the Gemini 4000 to process the preset. It varies with the Count Rate and Scale Factor Value.

FIG. 3: RESET COMMAND TIMING

PRINT OPTIONS

The various Print Options are used mainly in conjunction with a printer and the Print Request Terminal. They provide a choice of Gemini data values to be printedwhen eitherthe Print Request Terminalis activated orthe “Transmitper Print Options” (P) command is sent to the Gemini. The various Print Options available are:

A. Print Display A count or rate value B. Print Display B Count Value C. Print Display A & B Values D. Print Preset 1 & 2 and Scale Factors A & B E. Print Display B, Presets 1 & 2, and Scale Factors A & B F. Print Display A, Presets 1 & 2, and Scale Factors A & B G. Print Display A & B, Presets 1 & 2, and Scale Factors A & B

Atypical print-out is shown below. The Print Optionsare selected bysetting S3, S4 and S5 on the Serial DIP Switch. See Page 34 for the various switch settings.

1 CTA 000054 1 PS1 000100 1 PS2 000500 1 SFA 01.0000 1 SFB 02.5000

CURRENT LOOP INSTALLATION

WIRING CONNECTIONS

When wiring the 20 mA current loop, remove the 7-position terminal block (TBD),located on theright side ofthe top board. Referto the numberslisted with the terminal descriptions below or on the top label, and install each wire in its proper location on the terminal block. When all connections are made, replace the terminal block into its proper location.

It is recommended that shielded (screened) cable be used for serial communications. This unit meets the EMC specifications using ALPHA #2404 cable or equivalent. There are higher grades of shielded cable, such as, four conductor twisted pair, that offer an even higher degree of noise immunity.

TERMINAL DESCRIPTIONS FOR TERMINAL BLOCK TBD

1. -20 mA SRC (COMM.) - Co mmon

2. PRINT REQUEST - The Print Request Terminal is pulled low to request the

Geminito transmitaccording tothe Print Optionsmode that has been selected.

(Minimum Activation time = 25 msec.)

3.+20 mA SRC- The 20mA SRC terminalprovides the source current forone of

the loops.

4. SO- (Serial Out-) -

5. SO+ (Serial Out+) -

The Gemini transmits the requested data on these terminals. They are connected in series to the receive input of the d evice to be connected.

6. SI- (Serial In-) -

7. SI+ (Serial In+) -

The Gemini receives commands on these terminals. They are connected in series with the transmit or output terminals of the device to be connected.

Note: The serial Input terminals must be held in the mark condition (current on)

in order for the Gemini to respond to a Print Request terminal activation.

SERIAL DIP SWITCH SET-UP

TheSerial DIPswitches are accessiblethrough theside of theGemini. Alist of the DIP switch positions and their functions are shown in the figure at right.

BR0& BR1,BAUD RATE -Set-up isshown , atright. Whenchanging theBaud

Rate, the unit should be powered-down and then powered back up again. The

unitwill onlyrecognize abaud ratechange uponpower-up, afteractivating the

“Print Request” terminalor after a few characters have been sent at the new baud rate (If the two previous conditions have not occurred, the Gemini will

see the characters as erroneous and it will check the baud rate and set itselfto operate at the new rate).

PR.ID- PRINTID. -When this switch is inthe upposition, theGemini willprint

the unit address, data value ID and the data value when a transmission is requested. The unit will also insert a 400 msec delay between transmissions when the “P” command or Print Request terminal is used. This switch position is generally used when the unit is connected with a printer. When the switch is in the down position, the Gemini will transmit only the data value,without the unitaddress and data ID. The400 msec delay, described above, willnot be inserted. This switch position usage is intended for applications where the Gemini is communicating with a computer. In these circumstances printing the address and value ID and inserting a 400 msec print delay is usually unnecessary and needlessly slows down communication throughput.

PC0, PC1, & PC2, PRINT OPTIONS - Used to control which values are

printed out when the Print Request terminal is activated or when the Transmit per Print Options command “P” is sent to the Gemini 4000.

AD0, AD1, AD2, & AD3 UNIT ADDRESS - These switches are used to give

eachunit aseparate addresswhen morethan oneunit isconnected inthe Loop. See below for Switch Set-up.

PROCESS MONITORING SYSTEM

Five Geminis with 20 mA Current Loop Option, are used to monitor and control parts packaging machines in a plant. The units are located at each of the machines in the production area of the building. The communications lines are run to an Industrial computer located in the p roduction offices.

[OTHER GEMINIS OR RLC PRODUCTS WITH 20 MA CURRENT LOOP

CAN BE CONNECTED IN THE SAME LOOP.]

The drawing below shows the Current Loop set-up. Each Geminiis given an address and the Serial DIP switches are set accordingly.A BaudRate of1200 is selected and setin eachof the Geminis. An application program is written, which sends and retrieves data from the units using the Change and Transmit Value commands.

NOTE: The Gemini DC out (terminals 4 & 5)

could be used in place of the external 12

VDC supply.

COMMUNICATIONS APPLICATION

TROUBLESHOOTING GEMINI SERIAL COMMUNICATIONS

If problems are encountered when trying to get the Gemini(s) and host device orprinter tocommunicate,the followingchecklist can beused tohelp find the solution.

1.Check all wiring. Referto the previous application examples and use themas a

guide to check your serial communication wiring. Proper polarity of all

Geminisand otherperipherals must beobserved. If amultimeter orammeter is

available, insert it in series in each Serial loop and check for current flow with

all units powered up. If no current is flowing, either the loop is not wired

correctly, or some other fault has occurred. If too much current has been sent

througha Serial Inputor Output, the unitmay have beendamaged. If aGemini

is suspected, it can be tested for operation by using the Serial Loop-back test

described in the next section.

2. If the Gemini is set-up with a “host computer”, device or printer, check to

make sure that the computer or device is configured with the same

communication format as the Gemini. The only communication format the

Gemini will accept is; 1 start bit, 7 data bits, odd parity, and 1 stop bit.

3.Check the baud rate settings and make sure all devices in the loop are set to the

same baud rate.

4. Check the Gemini’s unit address. If the Address command is not used when

transmitting a commandto the Gemini, the Gemini’s address must be s et to 0.

See “Sending Commands & Data to the Gemini” section for command

structure.

5. If two-way communications are to be established between the Gemini and a

computer, try getting the computer to receive transmissions from the Gemini

first. The Gemini’s “PRINT REQ.” terminal can be used to initiate the

transmissions from the Gemini.

6. When sending commands to the Gemini, the * (2Ah) must terminate the

command. NO CARRIAGE RETURNS (0Dh) OR LINE FEED (0Ah)

CHARACTERS SHOULD BE SENT TO THE GEMINI. If they are sent, the

Gemini will not respond to the next command.

7.For applications where 1200 Baud or lower is used, the commandterminator (*)

can be sent before the string to eliminate any illegally transmitted characters.

SERIAL LOOP-BACK SELF-TEST

TheGemini has aSerial Loop-back Self-test f eature. This test enables the user to verify the operation of the Gemini when problems are encountered trying to get the Gemini and “Host device” communicating. In this test, the Gemini’s Serial Input and Output Loops are connected together with the 20 mA source supplyingthe loop current.The Gemini then transmitsdata “to itself”.Ifthe data is received properly, the Gemini will change its Scale Factor B value to 0.1111. To perform the loop-back test, f ollow the test sequence as described below.

1. With the unit powered down, wire up the serial terminal block, “TBD”,as

shown in the diagram below.

2. Set the Gemini’s unit address to 15 (set switches 7-10 of the Serial DIP Switch

to the down position).

3. Apply power to the unit. On power-up the Gemini will perform the loop-back

test.To check the results: Callup the Scale Factor B valueby pressing the “3”

key while the Counter B value is being displayed. If the Serial loop is

functioning properly the Scale Factor B value will be 0.1111. If this result is

not obtained, double check the connections with those shown in the diagram,

and the unit address switch positions and repeat step 3.

4. If the connection between the Print Request terminal, “PRINT REQ.” and

“COMMON” isdisconnected while the unit is under power, the Scale Factor

B value will change back to its previous setting.

Ifthe unitdoes notpass thistest, contactyour localRed LionControls distributor.

APPENDIX “A” - INST ALLATION & INPUT CONFIGURATION SWITCH SET-UP

Before installing the Gemini into the panel, the user should first become familiarwiththe unit. It mayalso bedesirable to programthe unit and appropriate DIP switches for the application at hand (Refer to the “Programming and Applications” sections). Once the unit is programmed,the settings will be saved in memory.The Program Disable “ PGM. DIS.” terminal should be connected to “COMM.” to prevent accidental or unauthorized programming changes.

Installation Environment

The unit should be installed in a location that does not exceed the maximum operating temperature and provides good air circulation. Placing the unit near devices that generate excessive heat should be avoided.

The bezel should be cleaned only with a soft cloth and neutral soap product. DoNOT use solvents. Continuous exposureto direct sunlight mayaccelerate the aging process of the bezel.

Do not use tools o f any kind (screwdrivers, pens, pencils, etc.) to operate the keypad of the unit.

PANEL MOUNTING {Note: See Appendix “B” for dimensions}

TheGemini isintended to bemounted intoan enclosed panelwith a gasket to provide a water-tight seal. The unit meetsNEMA 4/IP65 requirements for indoor use when properly installed. Two mounting clips and screws are providedfor easy installation. Consideration shouldbe given to the thickness of the panel. A panel which is too thin may distort and not provide a water-tight seal. (Recommended minimum panel thickness is 1/8".)

After the panel cut-out has been completed and deburred, remove the backingfrom the adhesiveside of the gasket, andcarefully apply the gasket to the panel. DO NOT

APPLY THE ADHESIVE SIDE OF THE

GASKET TO THE COUNTER BEZEL. Insert the unit into the panel.

Installthe screwsinto the narrowends of themounting clipsas shown inthe drawing to the left. Thread the screws into the clips until the pointed end just protrudes through the other side.

Install each of the two mounting clips by inserting the wide lip of the clips into thewide end of the holes locatedon either side of the case. Tighten the screws evenly, applying uniform compression, thus providing a water-tight seal.

CAUTION: Only minimum pressure is required to seal panel. Do NOT

over

tighten mounting screws.

SELECT AC POWER (115/230 VAC)

The AC power to the unit must be selected for either 115 VAC or 230 VAC. The selector switch is located through an access slot on the side of the case (See the Installation Figure on the previous page, or the label on the case). The unit is shipped from the factory with the switch in the 230 VAC position.

Caution: Damage tothe unit mayoccur if the AC selector switch isset incorrectly.

EMC Compliance Installation

This unit complies with the Electromagnetic Compatibility (EMC) standards listed in the specifications. Compliance to the EMC standards was demonstrated by means of a test set-up using the following installation methods:

1. Unit mounted in a metal panel connected to earth ground (protective earth).

2.Shielded (screened)cables forSignal and Controlinputs withshield drain wire

connected to earth ground at the mounting panel only.

Belden#8451 2conductor, #22AWG twistedpair withfoil shieldand drain wire Belden #8771 3 conductor, #22 AWG with foil shield and drain wire Alpha #2404 4 conductor, #22 AWG with foil shield and drain wire

3. Metal bezel of unit connected to mounting panel with 9 inch (23 cm) ground

lead from rear bezel screw. Test: Immunity to ESD per EN61000-4-2.

4.Shaffner FN610 EMI Filter placedon DC mainscable whenusing optional DC

power. Test: Electrical Fast transients (burst) (EFT) EN 61000-4-4.

5.Shaffner FN610 EMI Filter placedon DC mainscable whenusing optional DC

power supply. Test: RF Conducted Immunity per ENV 50141.

Shield Termination

EMC compliance installation testing had the drain wire for the shielded cable

terminated as shown. The drain wire was less than 0.5" (12.7 mm) long.

Additional EMC Installation Guidelines

Although this unit is designed with a high degree of immunity to ElectroMagnetic Interference (EMI), proper installation and wiring methods must be followed to ensure compatibility in each application. The type of the electrical noise, source or coupling method into the unit may be different for various installations. Listed below are some additional EMC guidelines for successful installation in an industrial environment.

1. The unit should be mounted in a metal enclosure, which is properly connected

to protective earth.

a. If the bezel is exposed to high Electro-Static Discharge (ESD) levels,

above 4 Kv, it should be connected to protectiveearth. This can be done bymaking surethe metalbezel makesproper contactto the panelcut-out or connecting the bezel screw with a spade terminal and wire to protective earth.

2. Use shielded (screened) cables for all Signal and Control inputs. The shield

(screen) pigtail connection should be made as short as possible. The

connection point for the shield depends somewhat upon the application.

Listed below are the recommended methods of connectingthe shield, in order

of their effectiveness.

a. Connect the shield only at the panel where the unit is mounted to earth

ground (protective earth).

b. Connect the shield to earth ground at both ends of the cable, usually

when the noise source frequency is above 1 MHz.

c. Connect the shield to common of the unit and leave the other end of the

shield unconnected and insulated from earth ground.

3. Never run Signal or Control cables in the same conduit or raceway with AC

powerlines, conductorsfeeding motors,solenoids, SCRcontrols, and heaters,

etc. The cables should be run in metal conduit that is properly grounded. This

is especially useful in applications where cable runs are long and portable

two-way radios are used in close proximity or if the installation is near a

commercial radio transmitter.

4. Signal or Control cables within an enclosure should be routed as far away as

possible from contactors, control relays, transformers, and other noisy

components.

5. In very electrically noisy environments, the use of external EMI suppression

devices, such as ferrite suppression cores, is effective. Install them on Signal

and Control cables as close to the unit as possible. Loop the cable through the

core several times or use multiple cores on each cable for additional protection.

Install line filters on the power input cable to the unit to suppress power line interference. Install them near the power entry point of the enclosure. The following EMI suppression devices (or equivalent) are recommended: Ferrite Suppression Cores for signal and control cables:

Fair-Rite # 0443167251 (RLC #FCOR0000) TDK # ZCAT3035-1330A Steward #28B2029-0A0

Line Filters for input power cables:

Schaffner # FN610-1/07 (RLC #LFIL0000) Schaffner # FN670-1.8/07 Corcom #1VR3

Note: Reference manufacturer’s instructions when installing a line filter.

6. Long cable runs are more susceptible to EMI pickup than short cable runs. Therefore, keep cable runs as short as possible.

7. Switching of inductive loads produces high EMI. Use of snubbers across inductive loads suppresses EMI. Snubbers:

RLC #SNUB0000

WIRING CONNECTIONS

After the unit has been mechanically mounted, it is ready to be wired. All

wiring connections are made on removable plug-in terminal blocks. There is a separate terminal block for the bottom board (TBA), relay board (TBB), count inputs (TBC), and optional Serial Communications (TBD). When wiring the unit, remove the terminal block and use the numbers on the label to identify the position number with the proper function. Simply strip the wire, leaving approximately ¼" bare wire exposed (stranded wires should be tinned with solder).Insert the wire into the terminal and tightendown the screwuntil the wire isclamped in tightly.Each terminal canaccept up to two18-gage wires. After the terminal block is wired, install it in the proper location on the PC board. Wire each terminal block in this manner.

Allconductors shouldmeet voltageand current ratingsfor each terminal.Also

cablingshould conformto appropriatestandards of g ood installation, localcodes andregulations. It is recommendedthat power suppliedto the unit(AC or DC)be protected by a fuse or circuit breaker.

POWER WIRING

AC Versions AC Power Wiring

PrimaryAC power is connected to terminals 1 and 2, labeled AC. To reduce the chance of noise spikes entering the AC line and affecting the counter, an AC feed separate from that of the load should be used to power the counter. Be certain that the AC power to the counter is relatively “clean” and within the specified range. Connecting power from heavily loaded circuits or circuits that also power loads that cycle on and off, (contacts, relays, motors, etc.) should be avoided.

The voltage selector switch, located on the side of the unit, is used to select the propervoltage. The switch is a slidemovement type and can beset by usinga small screwdriver. If the switch is towards the front of the unit, it is set for 230 VAC input. The switch is in the 230 VAC position when shipped from the factory.

Note: Before applying power to the unit,make sure the AC power selector switch

is set for the proper voltage setting.

DC Power Wiring

The DC power is connected to terminals 3 & 5, marked DC IN and COMM. respectively.The DC power source mustbe capable of supplying the unit’srated current (700 mA max.) and be within the specified 11 to 14 VDC range. The powersource can be a 12 V battery or an external power supply that is capable of supplyingthe unit’s rated current.It is not necessaryto provide battery backup to retain count information. The Gemini h as non-volatile memory that stores information on power down, thereby eliminating the need fo r battery back-up.

Output Power

DC OUT terminal provides a DC output for sensor power (+12 VDC ±25%). The maximum sensor current is 100 mA. This terminal number is model dependent. Refer to the label on the unit for correct number.

RELAY WIRING

To prolong contact life and suppress electrical noise interference due to the switching of inductive loads, it is good installation practice to install a snubber across the contactor. Follow the manufacturer’s instructions for installation.

Note: Snubber leakage current can cause someelectro-mechanical devices to be

held ON.

SERIAL COMMUNICATIONS

The Gemini can be purchased with a 20 mA Current Loop Communications Option. On these units, refer to the “Current Loop Communications” section of the manual, for wiring and operational procedures of the Serial Loop.

INPUT 1 & MAGNETIC PICKUP INPUT

The Magnetic Pickup Input and Logic Input 1 utilize some commoncircuitry. For this reason the Input 1 switches are used to set up both the Magnetic and Logic Input 1. S1 selects between Magnetic Pickup Input and Logic Input 1. WHEN A MAGNETIC PICKUP IS BEING USED, S2 MUST BE IN THE “SNK” POSITION or the unit will not count.

S3 (HI/LO FRQ) and S4 (HI/LO BIAS) do not effect the Magnetic Pickup Inputand their settingsare inconsequential. WhenS1 is inthe Logic position,the Magnetic Pickup Input is disabled and Input 1 can be used as a logic input.

Note: A Magnetic Pickup type sensor should not be used unless a large enough

signal is provided at all speeds of operation.

INPUT 2

Input 2 is designed specifically for Logic type inputs. When Input 1 is set up forLogic operation, bothInputs 1 and2 operate identically. DIP switch positions S5, S6, and S7 function the same as S2, S3, and S4.

INSTALLATION & REMOVAL OF THE RELAY BOARD

To install the relay board, locate the relay opening at the lower right-hand corner, on the back of the Gemini. Pull the tab down while sliding the board into the two slots in the housing. The relay board will seat into the unit, allowing the tab to return to its original position. To remove the relay board, pull down on the tabjust enough to allow therelay board to slideout. Grasp the terminalblock and pull to remove the board.

NOTES:

1. SENSOR VOLTAGE AND CURRENT The +12 V sensor supply voltage on the “DC OUT” terminal is nominal with +/-25% variation due to line and internal load variations. All RLC sensors will accommodate this variation.

2. HI/LO FRQ SELECTION The HI/LO FRQ selection switch must be set on “LO FRQ” when switch contacts are used to generate count input signals. Since the “LO FRQ” mode also provides very high immunity against electrical noise pickup, it is recommended thatthis modealso be used, whenever possible, with electronic sensor outputs. The “LO FRQ” mode can be used with any type of sensor output, provided count pulse widths never decrease below 5 msec, and the count rate does not exceed 100 cps.

3. V

and VIHlevels given are nominal values +/-10% when counter voltage on “DC OUT” terminal is +12 VDC. These nominal values will vary in proportion to the variations in the “DC OUT” terminal voltage, which are caused by line voltage and load changes.

4. When shielded cable is used, the shield should be connected to “COMM.” at the counter and left unconnected at the sensor end.

5. Inputs 1 and 2 can accept source pulses from other circuits up to +28 V in amplitude. For voltages above +28 V, a limiting resistor and zener diode should be used to limit the voltage at the input.

CONNECTIONS & CONFIGURATION SWITCH SET-UPS FOR VARIOUS SENSOR OUTPUTS (See Note 5)

SENSOR INPUT CONNECTIONS & INPUT CONFIGURATION SWITCH SET-UP

The accompanying diagram shows the details of Input 1, Input 2, and Magnetic Pickup circuit. The schematic circuit for Input 2 is almost identical to thatof Input 1,with the exception that Input 2 doesnot have theMagnetic Pickup circuitry paralleled with it. The four switches used to set up Input 1 and the Magnetic Pickup are designated S1, S2, S3, and S4. To set up Input 2, use switches S5, S6, and S7. The functions of these switches are as follows:

S1 - MAG: Enables the Magnetic Pickup terminal to be used.

LOGIC: Disables the Magnetic Pickup Input.

Note: SWITCH S2 MUST BE IN THE “SNK” POSITION FOR MAGNETIC PICKUP OPERATION.

S2- SNK:Provides a 7.8K pull-upresistor forsensors with currentsinking

outputs. SRC: Provides a 3.9 K pull-down resistor for sensors with current sourcing outputs.

S3 - HI FRQ: Removes damping capacitor and allows operation up to the

max. count frequency. Min. count ON or OFF time - 50 usec (U/D or INH.),50%Duty Cycle(all other“Inputs A& BResponse Modes”). LO FRQ: Connects damping capacitor for switch contact debounce. Limitscountspeed to 100cps max.Min. countpulse ONor OFFtime 5 msec. (See Note 2, Page 42.)

S4- HIBIAS: Sets input triggerlevels at mid-range to accept outputs from

2-wire proximity sensors, resistive photo-cells, and logic pulses with full0 to+12 Vswings. (V

=5.5V,VIH=7.5V,SeeNote3,Page42.)

LO BIAS: Sets input trigger levels to the low range to accept logic pulseswith0to5Vswings.(V

=1.5V,VIH=3.75V,SeeNote3,

Page 42.)

S5 - Same as S2, for Input 2. S6 - Same as S3, for Input 2. S7 - Same as S4, for Input 2. S8 - DIS. RST.: Disables front panel Reset button, “R”.

EN. RST.: Enables front panel Reset button “R”, if “Operator

Accessible Functions” mode (code 66) has reset enabled.

CHAN. B CHANNEL A

APPENDIX “B” - SPECIFICA TIONS& DIM ENSIONS

1. DISPLAY: 6-digit 0.56" (14.2 mm) High LED display.

2. POWER REQUIREMENTS:

AC Versions

AC Power: Switch selectable 115/230 VAC (±10%), 50/60 Hz, 20 VA DC Power: 11 to 14 VDC @ 0.7 amp maximum

3. SENSOR POWER: +12 VDC (±25%) @ 100 mA.

4. MEMORY: Non-volatile E

PROM memory retains all programming information and count values (except Counter Load values) when power is removed or interrupted.

Power Cycles (ON/OFF): 100,000 minimum Data Retention: 10 yrs. minimum

5. INPUTS 1 AND 2: Switch selectable to accept count pulses from a variety of

sources including switch contacts, outputs from CMOS or TTL circuits, and all standard RLC sensors. Current Sourcing - Unit provides pull-down resistor for sensor with current sourcing outputs. (Max. input voltage = 28 VDC @ 7 mA.) Current Sinking - Unit provides pull-up resistor for sensors with current sinking outputs. (Max. sensor current = 1.6 mA.) Debounce- Damping capacitor provided for switch contact debounce. Limits countspeed to100 Hzmaximumand inputpulse widthsto 5msec. minimum. Lo Bias - Input trigger levels V

=1.5V,VIH=3.75V

Hi Bias - Input trigger levels V

=5.5V,VIH=7.5V

Note: Bias levels given are ±10% @ 12 VDC. They vary proportionally with sensor supply voltage at “DC OUT” terminal.

6. MAGNETIC PICKUP INPUT: Sensitivity: 150 mV peak (typical @ 12 VDC) Hysteresis: 100 mV Input impedance:26.5KΩ @60Hz Maximum Input Voltage:±50Vp

7. RATE ACCURACY AND REPEATABILITY: +0.012%

8. RATE MINIMUM INPUT FREQUENCY: 0.03 Hz

Note: At frequencies below 0.03 Hz (1 pulse every 32 sec.) the rate display will go to zero.

9. CONTROL INPUTS: Reset - Active low (V

= 1.5 V max.), internally pulled up to +12 VDC (I

SNK

mA), activation and de-activation response time = 10 msec. Program Disable - Active low (V

= 1.5 V max.), internally pulled up to +5

VDC (I

SNK

=1mA).

Print Request - (Serial Communications) Active low, (V

= 1.5 V max.),

internally pulled up to +5 VDC (I

SNK

=1mA).

10. MAXIMUM COUNT RATES:

NOTE: Mounted units require a clearance of 6.8" (W) behind the panel.

DIMENSIONS In inches (mm)

COUNTER/RATE MODE [41 1]

MODE X1 X2 X4 Uni or Bi-directional 10 KHz 5 KHz Anti-Coincidence Add/Subtract 4 KHz 2.5 KHz Separate Input 8 KHz 4 KHz Quadrature 5 KHz 4.5 KHz 2.5 KHz

11. SERIAL COMMUNICATIONS: Type- Bi-directional20

mAcurrentloop, 20 mAsource provided.(Powers up

to 7 units in a loop with internal current source.)

Baud Rate - Programmable300 to 2400. Maximum Address - 16 units. (Actual number in a single loop is limited by

serial hardware specifications.) Data Format - 10 bit frame, Odd parity (one start bit, 7 data bits, one odd parity bit, and one stop bit.)

Serial Hardware Specifications -

SO - Output Transistor Rating: V

max

= 30 VDC, V

SAT

=1V

max

at 20 mA

SI - Input Diode Rating: V

=1.25V

TYP

;1.5V

max

Note: Thecompliance voltagerating ofthe sourcemust begreater than the

sum of the voltage drops around the loop.

12. OUTPUT(S): Solid-State - Current sinking NPN open collector transistors. I

SNK

= 100 mA

max. @ V

=1V. VOH= 30 VDC max. (Internal Zener diode protection).

Relays - Mounted on a field replaceable PC board. Form C contacts rated at 5 amps @ 120/240 VAC or 28 VDC (resistive load), 1/8 H.P. @ 120 VAC (inductive load). The operate time is 5 msec nominal and the release time is 3 msec nominal.

Relay Life Expectancy - 100,000 cycles at Max. Rating. (As load level decreases, life expectancy increases.)

Programmable Timed Outputs - The timed outputs can be set from 0.01 to

599.99 seconds, ±(0.01% + 10 msec.).

13. CERTIFICATIONS AND COMPLIANCES:

SAFETY

IEC61010-1,EN 61010-1:Safety requirementsfor electricalequipment

for measurement, control, and laboratory use, Part 1. IP65 Enclosure rating (Face only), IEC 529 Type 4 Enclosure rating (Face only), UL50

ELECTROMAGNETIC COMPATIBILITY: Immunity to EN 50082-2

Electrostatic discharge

EN 61000-4-2 Level 2; 4 Kv contact

Level3;8Kvair

Electromagnetic RF fields EN 61000-4-3 Level 3; 10 V/m

80 MHz - 1 GHz

Fast transients (burst) EN 61000-4-4 Level 4; 2 Kv I/O

Level3;2Kvpower

RF conducted interference EN 61000-4-6 Level 3; 10 V/rms

150 KHz - 80 MHz

Power frequency magnetic fields EN 61000-4-8 Level 4; 30 A/m

Emissions to EN 50081-2

RF interference EN 55011 Enclosure class A

Power mains class A

Notes:

1. Metal bezel of unit connected with ground from rear bezel screw to metal mounting panel.

2. When the unit is DC powered, a power line filter (RLC#LFIL0000 or equivalent) was installed, so as not to impair the function of the unit.

Refer to the EMC Compliance Installation section of the manual for

additional information.

14. ENVIRONMENTAL CONDITIONS: Operating Temperature: 0 to 50°C Storage Temperature: -40 to 70°C Operating and Storage Humidity:

85% max. RH (non-condensing) from 0°C to 50°C.

Altitude: Up to 2000 meters

15. CONSTRUCTION: Metal die-cast bezel, plastic case. This unit is rated for NEMA 4/IP65 indoor use. Installation Category II, Pollution Degree 2

16. WEIGHT: 2.1 lbs. (0.9 Kg)

DUAL COUNTER MODE [41 2]

MODE X1 X2 X4 Uni or Bi-directional 9 KHz 4.5 KHz Anti-Coincidence Add/Subtract 5 KHz 2.5 KHz Separate Input 7.5 KHz 3.5 KHz Quadrature 4.5 KHz 4 KHz 2.5KHz

APPENDIX “C” -TROUBLESHOOTING GUIDE

Themajority of difficultiesarising

withthe Gemini are related to incorrecthook-up and programmingset-up. Always

check all connections, f unction codes, Scale Factors, and preset as a first step in troubleshooting.

Before applying power, double check all wiring. Improper AC voltage or AC connections may result in permanent

damage to the unit.

For further technical assistance, contact technical support at the appropriate company numbers listed on the back of

this instruction manual.

PROBLEM

POSSIBLE CAUSE REMEDIES

NO DISPLAY 1. Power off, improperly connected, or power 1. Check all wiring, verify power.

brown-out.

P ON DISPLAY 1. Data error on power-up. 1a. Press “E” key.

b. Check all function codes.

E ON THE DISPLAY 1. Data error detected by processor. 1a. Press “E” or “ R” button.

b. Check all function codes. c. Check signal lines fo r possible noise sources.

NO RESPONSE TO FRONT PANEL 1. Panel disabled. 1. Consult manual on “Operator Accessible

Functions" modes.

UNIT DOES NOT COUNT 1. No input. 1. Check sensors/connections.

2. Input selected incorrectly. 2. Check rear panel DIP switches.

3. Count inhibited. 3. Check function code 43, “Input 1 and 2 Response” modes.

4. Scale factor/multiplier too small. 4. Check scale factor value and scale multiplier values.

UNIT WILL NOT ACCEPT THE DESIRED 1. When counter scale factors greater than 1 are used, 1. Unit automatically adjusts preset to be PRESET the p reset value must be evenly divisible by the evenly divisible by the scale factor.

scale factor.

APPENDIX “C” - TROUBLESHOOTING GUIDE (Cont’d)

PROBLEM

POSSIBLE CAUSE REMEDIES

UNIT COUNTS INCORRECTLY 1. Input type incorrectly selected. 1. Check rear panel DIP switches. Turn on LO

FRQ. switch for count speed of less than 100 cps.

2. Inputs incorrectly connected or loose connections. 2. Check sensors/input connections.

3. Electrical interference. 3. Check connections and wiring for noise sources.

4. Wrong counting mode. 4. Verify functions and modes.

5. Scale factor incorrect. 5. Change scale factor value.

UNIT WILL NOT RESET 1. Front panel reset disabled. 1.Check rear panel DIP switch.

2. Reset disabled. 2. Check function code 42 or 66.

DATA VALUES AND FUNCTIONS WILL 1. Front panel locked out. 1. Consult manual on “Operator Accessible NOT CHANGE OR NOT RECORDED Functions" mode (66).

2. Incorrect programming procedure (“E” not pressed). 2. Consult section on programming functions in sequential order.

UNIT COUNTS WHILE RESET IS 1. Reset mode set for “momentary reset”. 1. Change reset mode to “Maintained” reset (56). ACTIVATED

CODE MODE DESCRIPTION COMMENTS

41 UNIT PERSONALITY (-)Loads factory set code values*

+/-1 Counter/Rate* Rate Display → value (A)/Counter → Display value (B)

42 RESET BUTTON & TERMINAL ACTUATION MODES

1 Reset Rate Output For Rate, reset only affects the output and does not 2 Reset Counter change the displayed value. For Counter, reset affects the 3 Reset Rate Output & Counter output as well as the count value

43 INPUTS1&2RESPONSE MODES

1 Count with Inhibit Input 1 = Cnt & Rate, Input 2 = Inh for Cnt. 2 Count with Up/Down Control Input 1 = Cnt & Rate, Input 2 = Up/Dn for Cnt 3 Add/Subtract Input 1 = Add & Rate, Input 2 = Subtract 4 Separate Inputs Input 1 = Rate, Input 2 = Counter 5 Quadrature Input 1 = Cnt & Rate, Input 2 = Quadrature 6 Quadrature x4 Input 1 = Cnt, Quad, & Rate, Input 2 = Cnt & Quad

44 COUNTER NUMBER OF COUNT EDGES Cannot be programmed in Quad x4.

1 Single Edge Counting (x1) Count on falling edge of count input 2 Double Edge Counting (x2) Counton both edges of count input.

45 COUNTER SCALE MULTIPLIER

1 1 2 0.1 3 0.01 4 0.001

46 CNTR DECIMAL POINT & LEAD ZERO BLANKING

- (+) Leading Zero Blanking Enabled

- (-) Leading Zero Blanking Disabled * +/-1 No Decimal Point +/-2 Decimal Point Right of Digit 2 +/-3 Decimal Point Right of Digit 3 +/-4 Decimal Point Right of Digit 4 +/-5 Decimal Point Right of Digit 5 +/-6 Decimal Point Right of Digit 6

* Polarity sign is displayed in front of the identifier, a (-) sign is displayed, a (+) sign is not.

APPENDIX “D” - GEMINI COUNTER/RATE MODE FUNCTION COMMAND CODE SUMMARY

CODE MODE DESCRIPTION COMMENTS

51 OUTPUT ASSIGNMENT

(+) Preset Tracking Disabled

(-) Preset Tracking Enabled Preset 1 tracks Preset 2 +/-1 Output 1 to Rate A, Output 2 to Counter B +/-2 Outputs1&2toCounter B +/-3 Outputs1&2toRate A Automatically selects code [56,1].

52 OUTPUT 1 TERMINATION MODES

(+) Normal Phase Output normally “OFF”, turns “ON” at preset.

(-) Reverse Phase* Outputnormally “ON”, turns “OFF” at preset. +/-1 Terminate at Output 2 Start (Gemini 4200 only) Only available when [51 2] +/-2 Terminate at Output 2 End (Gemini 4200 only) Only available when [51 2] +/-3 Terminate at Manual Reset +/-4 Terminate at Manual Reset End +/-5 Terminate after Timed Output 1 +/-6 Boundary

53 TIMED OUTPUT 1 VALUE Range 0.01 to 599.99 sec. 54 GEMINI 4200 OUTPUT 2 TERMINATION MODES

(+) Normal Phase Output normally “OFF”, turns “ON” at preset.

(-) Reverse Phase* Outputnormally “ON”, turns “OFF” at preset. +/-1 Terminate at Output 1 Start Only available when [51 2] +/-2 Terminate at Output 1 End Only available when [51 2] +/-3 Terminate at Manual Reset +/-4 Terminate at Manual Reset End +/-5 Terminate after Timed Output 2 +/-6 Boundary Automatically selects code [56 1]

55 GEMINI 4200 TIMED OUTPUT 2 VALUE Range 0.01 to 599.99 sec. 56 COUNTER RESET MODES

(+) Maintained Unitremains reset as long as reset is activated.

(-) Momentary* Unit will reset instantly and will start counting again

even if reset is still activated.

* Polarity sign is displayed in front of the identifier, a (-) sign is displayed, a (+) sign is not.

APPENDIX “D” - GEMINI COUNTER/RATE MODE FUNCTION COMMAND CODE SUMMARY

CODE MODE DESCRIPTION COMMENTS

56 COUNTER RESET MODES (Cont’d)

+/-1 Manual Reset to Zero Automatically selected when outputs are configured for rate

[51 3] or when boundary mode is used [54 6]. +/-2 Manual Reset to Preset** +/-3 Automatically Reset to Zero after Timed Output** +/-4 Automatically Reset to Preset after Timed Output** +/-5 Automatically Reset to Zero at Preset** Counter resets as soon as Output is activated.** +/-6 Automatically Reset to Preset at Zero**

61 RATE RIGHT-HAND DUMMY ZEROS

1 1 Dummy Zero 2 2 Dummy Zeros 3 3 Dummy Zeros 4 No Dummy Zeros

62 RATE CONVERSION FACTOR

1 Rate Per Second (x1) 2 Rate Per Minute (x60) 3 Rate Per Hour (x3600)

63 RATE MINIMUM UPDATE TIME

1 0.5 Sec minimum/1 Sec maximum 2 1 Sec minimum/2 Secs maximum 3 2 Secs minimum/4 Secs maximum 4 4 Secs minimum/8 Secs maximum 5 8 Secs minimum/16 Secs maximum Maximum rate = 7500 cps 6 16 Secs minimum/32 Secs maximum Maximum rate = 3250 cps

64 RATE SCALE MULTIPLIER

1 1000 2 100 3 10

4 1 * Polarity sign is displayed in front of the identifier, a (-) sign is displayed, a (+) sign is not. ** For the Gemini 4200, all reset to preset modes reset to preset 2 and Timed Output refers to Output 2.

APPENDIX “D” - GEMINI COUNTER/RATE MODE FUNCTION COMMAND CODE SUMMARY

CODE MODE DESCRIPTION COMMENTS

64 RATE SCALE MULTIPLIER (Cont’d)

5 0.1

6 0.01

65 RATE DECIMAL POINT & LEAD ZERO BLANKING

(+) Leading Zero Blanking Enabled

(-) Leading Zero Blanking Disabled* +/-1 No Decimal Point +/-2 Decimal Point Right of Digit 2 +/-3 Decimal Point Right of Digit 3 +/-4 Decimal Point Right of Digit 4 +/-5 Decimal Point Right of Digit 5 +/-6 Decimal Point Right of Digit 6

66 “OPERATOR ACCESSIBLE FUNCTIONS” MODES “PGM DIS” Terminal connected to “Comm”

(+) Reset Button & “RST” Terminal Enabled Front panel reset can be independently disabled by using

DIP switch.

(-) Reset Button & “RST” Terminal Disabled* This mode has no affect on the “RST A” terminal which is

always enabled. +/-1 No Functions Enabled +/-2 Preset Programming Enabled +/-3 Scale Factor Programming Enabled +/-4 Preset & Scale Factor Programming Enabled +/-5 Preset & Counter Load Programming Enabled +/-6 Preset, Scale Factor & Counter Load Programming Enabled

1 PRESET 1 Up to +/-999999 2 PRESET 2 Up to +/-999999 3 Display A RATE SCALE FACTOR Upto 5.9999 3 Display B COUNTER SCALE FACTOR Up to +/-5.9999

E & Display B COUNTER LOAD VALUE Up to +/-999999. Counter load value is NOT saved in

+/- memory when power is removed.

* Polarity sign is displayed in front of the identifier, a (-) sign is displayed, a (+) sign is not.

APPENDIX “D” - GEMINI DUAL COUNTER MODE FUNCTION COMMAND CODE SUMMARY

CODE MODE DESCRIPTION COMMENTS

41 UNIT PERSONALITY (-)Loads factory set code values*

+/-2 Dual Counter* Counter A→Display value (A)/Counter B→Display value (B)

42 RESET BUTTON & TERMINAL ACTUATION MODES

1 Reset Counter A Reset affects the outputs as well as the displayed value. 2 Reset Counter B 3 Reset CounterA&B

43 INPUTS1&2RESPONSE MODES

1 Count With Inhibit Input 1 = Cnt A & Cnt B, Input 2 = Inh. 2 Count With Up/Down Control Input 1 = Cnt A & Cnt B, Input 2 = Up/Dn. 3 Add/Subtract Input 1 = Add, Input 2 = Subtract 4 Separate Inputs Input 1 = Counter A, Input 2 = Counter B 5 Quadrature Input 1 = Cnt A & Cnt B, Input 2 = Quadrature 6 Quadrature x4 Input 1 = Cnt & Quad, Input 2 = Cnt & Quad.

44 COUNTERA&BNUMBER OF COUNT EDGES Cannotbe programmed in quadrature x4.

1 Single Edge Counting (x1) Count on falling edge of count input. 2 Double Edge Counting (x2) Count on both edges of count input

45 COUNTER B SCALE MULTIPLIER

1 1 2 0.1 3 0.01 4 0.001

46 CNTR B DECIMAL POINT & LEAD ZERO BLANKING

(+) Leading Zero Blanking Enabled

* Polarity sign is displayed in front of the identifier, a (-) sign is displayed, a (+) sign is not.

APPENDIX “D” - GEMINI DUAL COUNTER MODE FUNCTION COMMAND CODE SUMMARY

CODE MODE DESCRIPTION COMMENTS

51 OUTPUT ASSIGNMENT

(+) Preset Tracking Disabled

(-) Preset Tracking Enabled* Preset 1 tracks Preset 2 +/-1 Output 1 to Counter A, Output 2 to Counter B +/-2 Outputs1&2toCounter B Automatically selects [61 1]

52 OUTPUT 1 TERMINATION MODES

(+) Normal Phase Output normally “OFF”, turns “ON” at preset.

53 TIMED OUTPUT 1 VALUE Range 0.01 to 599.99 sec. 54 GEMINI 4200 OUTPUT 2 TERMINATION MODES

(+) Normal Phase Output normally “OFF”, turns “ON” at preset.

55 GEMINI 4200 TIMED OUTPUT 2 VALUE Range 0.01 to 599.99 sec. 56 COUNTER B RESET MODES

(+) Maintained Unitremains reset as long as reset is activated.

(-) Momentary* Unit will reset and start counting again, even if reset is

still activated.

* Polarity sign is displayed in front of the identifier, a (-) sign is displayed, a (+) sign is not.

APPENDIX “D” - GEMINI DUAL COUNTER MODE FUNCTION COMMAND CODE SUMMARY

CODE MODE DESCRIPTION COMMENTS

56 COUNTER B RESET MODES (Cont’d)

+/-1 Manual Reset to Zero Automatically selected when boundary mode is used [52,6]. +/-2 Manual Reset to Preset** +/-3 Automatically Reset to Zero after Timed Output** +/-4 Automatically Reset to Preset after Timed Output** +/-5 Automatically Reset to Zero at Preset** Counter resets as soon as Output is activated.** +/-6 Automatically Reset to Preset at Zero**

61 COUNTER A RESET MODES

(+) Maintained Unitremains reset as long as reset is activated. (-) Momentary* Unit will reset and start counting again, even if reset is

still activated. +/-1 Manual Reset to Zero Automatically selected when boundary mode is used [52,6]. +/-2 Manual Reset to Preset 1 +/-3 Automatically Reset to Zero after Timed Output 1 +/-4 Automatically Reset to Preset 1 after Timed Output 1 +/-5 Automatically Reset to Zero at Preset 1 Counter resets as soon as Output 1 is activated. +/-6 Automatically Reset to Preset 1 at Zero

64 COUNTER A SCALE MULTIPLIER

1 1 2 0.1 3 0.01

4 0.001 * Polarity sign is displayed in front of the identifier, a (-) sign is displayed, a (+) sign is not. ** For the Gemini 4200, all reset to preset modes reset to preset 2 and Timed Output refers to Output 2.

APPENDIX “D” - GEMINI DUAL COUNTER MODE FUNCTION COMMAND CODE SUMMARY

CODE MODE DESCRIPTION COMMENTS

65 CNTR A DECIMAL POINT & LEAD ZERO BLANKING

(+) Leading Zero Blanking Enabled

66 “OPERATOR ACCESSIBLE FUNCTIONS” MODES “PGM DIS” Terminal connected to “Comm”

(+) Reset Button & “RST” Terminal Enabled Front panel reset can be independently disabled by using

DIP switch.

(-) Reset Button & “RST” Terminal Disabled* This mode has no affect on the “RST A” terminal which is

1 PRESET 1 Up to +/-999999 2 PRESET 2 Up to +/-999999 3 Display A COUNTER A SCALE FACTOR Up to +/-5.9999 3 Display B COUNTER B SCALE FACTOR Up to +/-5.9999

E & Display A COUNTER A COUNTER LOAD VALUE Up to +/-999999. Counter Load value is NOT saved in

+/- memory when power is removed.

E & Display B COUNTER B COUNTER LOAD VALUE Up to +/-999999. Counter Load value is NOTsaved in

+/- memory when power is removed.

* Polarity sign is displayed in front of the identifier, a (-) sign is displayed, a (+) sign is not.

APPENDIX “E” -SCALING FORCOUNTING

The Gemini is factory set to provide 1 count on the display for each pulse that is input to the unit. In many applications, there will not be a one to one correspondence between input pulses and display units. In these applications it willbe necessary for the Gemini toscale or multiply the input pulsesby a scaling factor to achieve the proper display units (feet, meters, gallons, widgets, etc.). Therearethree differentfunction codesthat areused in scalingthe inputpulses to the desired reading. They are: the “Counter Scale Factor”, the “Counter Scale Multiplier”, and the “Counter Number of Count Edges”. All three are factored together to provide the Total Scaling that is necessary.

This section applies to Counter A (if Dual Counter personality) and Counter B. Thereare separateScale Factorsand ScaleMultipliers associatedwith each counter.

The “Number of Count Edges”, function code 44 or code 43 (Quad x4), will apply to both counters. In other words, if one counter requires that 2 count edges be used per input pulse, programming that mode will cause both counters to use both count edges. In the Quadrature x4, Inputs 1 & 2 Response mode, both the rising and falling edges of both Inputs, 1 & 2, are counted. In this mode the “Number of Count Edges” is 4.

The first step in scaling the counter requires that the “Number o f Pulses” per “DisplayUnit” or “Display Units” be obtained. This mayrequire a small amount of deductive reasoning. For example: A 48 tooth gear is mounted to a 2 ft circumference feed roll in a paper processing plant. It is desired to totalize the total footage of paper processed. In this example the units of display will be in feet.A sensor sensing the gear teeth will provide 48 pulses for each revolution of the feed roll. Each revolution will equate to a linear distance of 2 feet. The number of “Display Units” will be 2. The “Number of Pulses” per “Display Units” (2 feet) would naturally be 48.

Once the number of “Display Units” and the “Number of Pulses” have been obtained, the Total Scaling Factor can be calculated.

The “Total Scaling Factor”, denoted as “K

”, is simply the total amount of scaling required. It is obtained by dividing the “Display Units” by the “Number of Pulses” as shown in Formula #1 below.

FORMULA #1: K

= Display Units/Number of Pulses

WHERE:

DISPLAYUNITS -The numberof units(revolutions, feet,10ths of feet,meters,

etc.) that would be acquired after the “Number of Pulses” has occurred.

NUMBEROF PULSES -The Number ofpulses required to achievethe number

of “Display Units”. For the preceding example, the Total Scaling Factor, “K

”, is calculated by

pluggingin 2 and 48 inthe formula. K

=Display Units/Number ofPulses = 2/48

= 0.041667.

As previously stated, the Total Scaling Factor, “K

”, is the combination of the ScaleFactor, ScaleMultiplier, andNumber ofCount edges.In manyapplications the Total Scale Factor, “K

”, can be programmed directly into the Scale Factor, the

ScaleMultiplier and Numberof CountEdges factory settings, of x1,would beused.

In someapplications, more display resolution may be required. Whenever the Total Scaling Factor is greater than 1.0000 and when utilizing only o ne edge per count pulse, there may not be enough display resolution. For example; with a Total Scaling Factor of 2.000, when an input pulse is generated, the display will incrementby 2. If the displayunits is in feet, when 3 feet has gone b y, the display will still only read 2. It will not increment again until 4 feet has been accumulated.Withthis amountof displayresolution itwould be impossible toset the Preset and have the output respond at odd feet intervals (1, 3, 5, etc.). To increase resolution, the Number of Count edges will have to be increased. This can be achieved by programming Function code 44 to mode 2, 2 edges, or Function code 43 to mode 6, Quad x4, if quadrature counting is being used.

If enough resolution still has not been attained, more input pulses will need to be generated per display unit.

The amount of resolution required will vary depending on the particular application. In cut-to-length applications, a high amount of resolution is often necessary. However, in totalizing applications, display resolution may not be important. It should be noted that whenever the number of count edges is increased to 2 or 4 (Quad x4), the maximumcount frequency will decrease. (See Appendix “B” for maximum count frequency specification.)

Note: When using 2 or 4 edge counting for length sensor, on/off duty cycle must

be 50% to maintain max. accuracy (mag. pickup will not work).

Once the Number of Count Edges (NCE) to be used has been determined, the

Remaining Scaling factor required, “K

”, can be calculated. This is simply the

Total Scaling Factor, “K

”, divided by the Number of Count edges.

FORMULA #2: K

R=KT

/NCE

WHERE: K

- Remaining Scaling required

In our original example, the Total Scaling Factor, “K

” was determined to be

0.041667. Since this value is less than one, sufficient pulse information is being generated, i.e., there is enough resolution for the units selected. The Number of Count edges can be left at the factory set value of 1. The Total Scaling Factor, “K

”,effectively becomesthe Total Scaling Remaining, “KR”.(KR=0.041667/1

= 0.041667)

If the scaling remaining is between 0.6000 and 5.9999, it can be programmed directly into the Scale Factor value and the x1 factory setting for the Scale Multiplier, “SCM”, can be used.

The general rule for choosing an SCM value is, when the Remaining Scaling Required, “K

”, is less than 0.6000, an SCM value of 0.1 or 0 .01 can be used to get a Scale Factor value between 0.6 and 5.9999 or to the point where the maximum number of significant digits is obtained.

FORMULA #3: SF = K

/SCM

Following our continuing example, it is easy to see that the Scaling

Remaining, “K

” (0.041667), cannot fit into the Scale Factor Value without losing significant digits. Using the Formula above and a Scale Multiplier value of0.01, willallow usto getthe maximumnumberofsignificant digits possible (SF=K

/SCM = 0.041667/0.01 = 4.1667).

COUNTER SCALING EXAMPLE:

EXAMPLE #1:

A flow sensor provides 62 pulses per gallon. Calculate the scaling required to

provide a display reading in gallons.

In this example the number of “Display Units” is the same as the desired

reading, since there are no decimal points involved.

The number of “Display Units” displayed after 62 pulses have been counted

should be 1.

STEP 1 - C alculate the Total Scaling Factor, “K

”, using Formula #1.

= Display Units/Number of Pulses (Formula #1)

= 1/62 = 0.016129

STEP 2 - In this application 62 pulses per gallon provides more than enough

resolution, so the “Number of Count Edges” is left set to the factory configured value of 1. With a “ NCE” value of 1, the remaining amount of scaling necessary is still 0.016129

R=KT

/NCE (Formula #2)

= 0.016129/1 = 0.016129

STEP3 - In order to provide maximumscaling accuracy, a “Scale Multiplier”

value is chosen that will give the maximum amount of significant digits in the Scale Factor. A value of 0.01 will result in a Scale Factor Value of 1.6129.

SF = K

/SCM (Formula #3)

SF = 0.016129/0.01 = 1.6129

EXAMPLE #2:

A quadrature Rotary Pulse Generator that provides 100 pulses per revolution iscoupled toa feedroll that is2.5 feetin circumference.It isdesired to read in feet with display resolution to the nearest hundredth of feet.

Inthis application, the requirementis for the display toread in hundredths of a foot. A 2.5 ft. distance will equate to 250 “Display Units” (hundredths). The “Number of Pulses” for 2.5 ft. (250 hundredths) is 100, as stated.

From the information obtained, the Total Scaling Factor, “K

”, can be

calculated, using Formula #1.

= Display Units/Number of Pulses

=250/100=2.5

With a Total Scaling Factor, “ K

”, of 2.5, it can easily be seen that for every pulse that is input, the display will increment by 2.5 display units (hundredths). The application requiresresolution to the nearest hundredth of a foot. In order to get higher resolution, Quadrature x4 Input Response Mode is selected. This will providefour times more resolution. Using Formula#2, and 4 for the “Number of Count Edges”, the Remaining Scaling, “K

”, is calculated.

R=KT

/Number of Count Edges

=2.5/4=0.625

At this point, it can be seen that the Remaining Scaling value of 0.625 will fit into the Scale Factor value range without losing any significant digits or scaling itany further. Because of this, the ScaleMultiplier (SCM) factory set value of x1 is used, and 0.6250 is programmed directly into the Scale Factor, “SF”.

SF = K

/SCM

SF = 0.6250/1 = 0.6250

APPENDIX “F” - SCALINGFOR RA TE

The Gemini offers a simplified method for scaling the rate indicator. The methoddoes not require timeunitconversions. Thedesired timeformat (RatePer Second, Rate Per Minute, Rate Per Hour) is simply selected as part of the programming procedure.

Dueto the waythe rate iscalculated (See “General Description”section), high resolution and accuracy can be realized at all input rates, slow or fast. It is not necessary to increase the pulse information to obtain higher resolution.

The Rate Minimum Update Time, f unction code 63, can be increased (from

0.5 sec. up to 16 sec.) to provide averaging in applications where the input pulse spacing is not stable. The Update time selected, however, will not affect the scaling in any manner.

Scaling the Rate channel simply involves programming the Gemini so that pulse units inputted to the unit will be scaled to the desired display units (revolutions,feet, meters, etc.) in the desiredtime format (Rate Per Second,Rate per Minute, Rate Per Hour).

There are two basic types of rate scaling applications for the Gemini. The first is when the rate indicator is to display the rate at which the counter is counting (count and rate using the same sensor). In this case, the rate indicator can be programmed with the same scaling parameters as the counter. The only other requirement is that the desired “Rate Conversion Factor”, function code 62, be selectedto provide the rate displayin the desiredtime format,i.e., Rateper Second, Rateper Minute or Rate per Hour. This will automatically scale the rate by x1, x60 or x3600 (1 pulse per second = 60 pulses per minute = 3600 pulses per hour).

Note: If the number of Count Edges for Counter B is 2 or 4, the rate must be

scaled by the same amount using the Rate Scale Factor and Scale Multiplier.

This is due to the fact that the rate indicator only uses 1 edge.

Thesecond basictype ofrate applicationis whenthe rateindicator and counter areusing two separatesensors. In this case, both the rate andcount channels must be scaled separately.

Scaling for the count channel is discussed in Appendix “E” - Scaling for Counter.

In order to scale the rate, it is only necessary to know the numberof pulses per display unit or units (feet, revolutions, etc.). For example; if a 48 tooth gear, which is coupled to a shaft, is being sensed and it is desired to indicate the shaft speed in revolutions,the display units would be revolutions. It is obvious that 48 pulses will occur in one revolution.

Inorder to convert thepulse units to revolutions, itis necessary for theGemini to multiply the number of pulses by a scaling factor to convert the pulse units to revolution units. The Gemini has two programming codes that serve to scale pulse units to desired display units. They are: the Scale Factor and the Scale Multiplier. Both are used to attain the Total Scaling Factor, “K

”.

To calculate the Total Scaling Factor, “K

”, for the application, the following

formula is used.

FORMULA #1: K

= Display units/Number of pulses

WHERE:

DISPLAYUNITS -The numberof units(revolutions, feet,10ths of feet,meters,

etc.) that would be acquired after the “Number of Pulses” has occurred. NUMBEROF PULSES -The Number ofpulses required to achievethe number

of “Display Units”.

Using the example previously discussed, the display unit would b e 1 revolution and thenumber of pulses per display unit would be 48. Therefore, the TotalScale Factor would be 0.020833 (K

=Display Units/Numberof Pulses = 1 rev/48 pulses per rev = 0.020833). In many applications the Total Scale Factor, “K

”, can be programmed as the Scale Factor, “SF”, and the Scale Multiplier, “SCM”,factory setting, x1, would be used. However, in some applications, such as the one above, it may be desired to obtain more significant digits in the Scale Factor, “SF”.

These situations occur when the “K

” factor does not calculate to an even numberthat will be fit into the f our decimal places available to the Scale Factor. The following formula can be used to calculate the Scale Factor when an SCM value other than x1 is needed.

FORMULA #2: SF = K

/SCM

In this formula, the Total Scaling Factor, previously calculated, is divided by

the Scale Multiplier Value, “SCM”, to obtain the Scale Factor, “SF”.

The general rule for choosing an SCM value is, when the Total Scale Factor,

“K

”, is less than 0.6000, an SCM value of 0.1 or 0.01 can be used to get a Scale Factorvalue between 0.6and 5.9999, orto the point where the maximumnumber of significant digits is obtained. If the Total Scaling Factor, “ K

”, is greater than

5.9999, then an SCM value of 10, 100, or 1000 can be used to obtain a Scale Factor Value between 0.6 and 5.9999.

In our initial example, the Total Scaling Factor, “K

” was determined to be

0.020833. It is easy to see that this number cannot be programmed into the Scale Factor,“SF”, without losing significant digits. Using formula #2 and the general

rulesstated above,a ScaleMultiplier Valueof 0.01is chosenand the Scale Factor is calculated as shown below. This will provide maximumamount of conversion accuracy possible.

SF = K

/SCM

SF = 0.020833/SCM

SF = 0.020833/0.01 = 2.0833

In situations where the Total Scale Factor is already in range of the Scale Factor (0.0001 to 5.9999) and when there are no significant digits that are lost, theTotal Scaling Factor, “K

”,can be programmed directly intothe Scale Factor Valueand a Scale Multipliervalue of 1 (thefactory set value) used.For example; if the display units are in feet and there are 100 pulses per foot, the Total Scaling Factor,“K

”,wouldbe0.01(KT=Display units/pulsesper displayunits =1 /100

= 0.01). Since the Total Scaling Factor, “K

”, is exactly 0.01, it can be programmed into the Scale Factor Value, “SF”, and the Scale Multiplier Value, “SCM”, can be left at, or programmed to, its factory setting of x1.

After the Scale Factor and Scale Multiplier values are selected, all that is necessary to complete the scaling is to choose the Rate Conversion Factor. The RateConversion Factor canbe selected to provideindication in Rate perSecond, Rate Per Minute, or Rate per Hour.

Note: There maybe situations wherethere are manymore pulses per display unit

than needed. In these situations the minimum SCM value (0.01) may not

provide enough significant digits in the Scale Factor. To achieve more

significant digits, the Rate Conversion Factor should be set to mode 1, Rate

per Second and the following formula be used.

SF = K

xCF

SCM

Where: CF = 60 f or display reading in Rate Per Minute, or

CF = 3600 for display reading in Rate Per Hour

RATE SCALING EXAMPLE:

EXAMPLE #1:

A 60 tooth gear is mounted to a roll that has a circumference of 2 feet. It is desired to have a rate readout in 10ths of feet per minute. Calculate the Scale Factor and Scale Multiplier values necessary to provide the desired readout.

Inthis example one revolution of the web willprovide 60 pulses for 2 feet of linear travel. Since the desired display units are to be in tenths of feet, it is necessary to convert 2 feet to tenths, giving us 20 tenths (display units). The Total Scaling Factor, “K

”, is calculated by simply plugging in the two

numbers into formula #1.

= Display Units/Number of Pulses

= 20/60 = 0.333333

In order to get the maximum number of significant digits in the Scale Factor

we use formula #2 and a Scale Multiplier value of 0.1 as shown below.

SF = K

/SCM SF = 0.333333/0.1 = 3.3333

To obtain rate indication in Feet Per Minute, the Rate Conversion Factor is programmedfor Rate per Minutemode. A decimal point is also added to provide for a display of feet in 10ths.

EXAMPLE #2:

Theshaft of apositive displacement pumphas a 14tooth sprocket that isbeing sensedby a magneticpickup. It is known thatwhen the unit is pumping810 liters of water per minute, the shaft is turning 400 RPM. It is desired to have a display readout in liters per minute.

With the Gemini, it is not necessary to deal with time unit conversions. From the information given, we know that when the shaft has turned 400 revolutions, 810 liters of water will have been pumped. The first step we need to take, is to calculate the number of pulses that occur when 810 liters have been pumped.

NUMBER OF PULSES = # of Revolutions x Pulses per Rev.

NUMBER OF PULSES = 400 Rev x 14 Pulses per Rev = 5600 pulses.

Wenow have all theinformation necessary to scalethe rate. The TotalScaling Factor, “K

”, is calculated using Formula #1 as shown below.

= Display Units/Number of Pulses

= 810/5600 = 0.144643

It is noticed that there are more significant digits in the Total Scale Factor, “K

”, than there are available for the Scale Factor, “ SF”. In order to acquire the maximum amount of significant digits for the Scale Factor, Formula #2 is used and a Scale Multiplier value of 0.1 is selected.

SF = K

/SCM

SF = 0.144643/0.1 = 1.4464

The Scale Factor, “ SF”, then becomes 1.4464 (1.44643 rounded to 4 decimal

places). This provides the maximum amount of conversion accuracy possible.

The final step is to select a Rate Conversion Factor. The Rate Conversion

Factor is chosen to be Rate Per Minute as was required.

MODEL

NO.

DESCRIPTION

W/20 mA

Current Loop

PART NUMBERS

115/230 VAC

GEM41 Gemini 4100

No GEM41060

Yes GEM41160

GEM42 Gemini 4200

No GEM42060

Yes GEM42160 Gemini 4100 Relay Board RLYBD001 Gemini 4200 Relay Board RLYBD002

For Information on Pricing, Enclosures & Panel Mount Kits, refer to the RLC Catalog or contact your local RLC distributor.

APPENDIX “I” - ORDERINGINFORMATION

LIMITED WARRANTY

The Company warrants the products it manufactures against defects in materials and workmanship for a period limited to two years from the date of shipment, provided the products have been stored, handled, installed, and used under proper conditions. The Company’s liability under this limited warranty shall extend only to the repair or replacement of a defective product, at The Company’s option. The Company disclaims all liability for any affirmation, promise or representation with respect to the products.

The customer agrees to hold Red Lion Controls harmless from, defend, and indemnify RLC against damages, claims, and expenses arising out of subsequent sales of RLC products or products containing components manufactured by RLC and based upon personal injuries, deaths, property damage, lost profits, and other matters which Buyer, its employees, or subcontractors are or may be to any extent liable, including without limitation penalties imposed by the Consumer Product Safety Act (P.L. 92-573) and liability imposed upon any person pursuant to the Magnuson-Moss Warranty Act (P.L. 93-637), as now in effect or as amended hereafter.

No warranties expressed or implied are created with respect to The Company’s products except those expressly contained herein. The Customer acknowledges the disclaimers and limitations contained and relies on no other warranties or affirmations.

Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com

Gemini 4100, 4200 Instruction Manual

Specifications and Main Features

Frequently Asked Questions

User Manual