Gedge Systems GS3100 Manual

GS3100 Weigh/Batching Front End
Operating & Installation Manual.
488 Church Street, Richmond, Victoria, 3121, Australia.
Phone [phone]. Fax [phone].
Email [email protected]
Year 2000 Compliant
Issue 6 of November 2005 Copyright GS Systems Pty Ltd ABN 18737137544 All Rights Reserved
NOW AVAILABLE WITH OPTIONAL MODBUS ASCII & RTU SERIAL I/O
and HIGH PRECISION ANALOG OUTPUT OPTION

Gedge Systems - Melbourne - Australia Email: [email protected] page 2
GS3100 Weigh/Batching Front End
The contents, format and authorship of all material produced or printed by any medium,
by or on behalf of GS Systems Pty. Ltd., is the subject of strict proprietorship of and by
GS Systems Pty. Ltd., and cannot be copied, reproduced, plagiarized or used in part or in
whole either directly or indirectly by any party whatsoever without the prior written
consent of GS Systems Pty. Ltd. This publication, all of its parts and all matters derived
from it, forms part of such material.
Gedge Systems expressly disclaims all responsibility for the direct and indirect consequences to each and every
party whatsoever, in respect of the use or application of this product or any other Gedge Systems product if it
is used in any way whatsoever beyond or outside the specified purpose for which it was supplied.
MANUAL & SOFTWARE VERSION NOTICE.
Manuals issue 4 of January 2001 and later apply to GS3100 products fitted with software version 7 or
greater shipped January 2001 or later. The software version can be checked when power is first applied
by noting the displayed message “3100.7A” or “3100.7b”. The “7” part of the message is the software
version number, the “A” identifies the unit as a “standard” GS3100 and the “b” identifies the unit as one
fitted at the factory with the OPTIONAL MODBUS serial I/O.
Improvements introduced with version 7 are the addition of PLC compatible 8bit serial communications
and the simplification of the setpoint output settings.
Manual issue 5 did not include a complete list of all 20 MODBUS registers whereas issue 5a does.
This Manual issue 6 applies to all GS3100 shipped during or after November 2005 displaying, during
power up, the software version "3100_8A" or "3100_7b". No changes have been made to the operation
of the MODBUS version "3100_7b". However the standard version "3100_8A" has been expanded to
include an Optional Analog Output Card with 4-20mA and 0-10VDC. Also included are controls to
simulate Full Scale and Zero Analog Output to facilitate external equipment calibration without the need
to apply loads to the weighing system.

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GS3100 Weigh/Batching Front End
5 1 INTRODUCTION & FEATURES.
7 2 OPERATING THE GS3100
72.1 Introduction
72.2 Applying Power, Retained & Cleared Settings, Serial I/O Considerations.
82.3 Messages & their meaning including the 3 methods of locking the GS3100's keys.
92.4 Front Panel Display
92.5 Front Panel Lamps
10 2.6 Keyboard Controls
11 3 FULL INSTALLATION DETAILS.
11 3.1 Installation steps.
12 3.2 Unpacking the GS3100.
12 3.3 Check the mains supply voltage on the rear of the GS3100.
12 3.4 Electrical supply quality.
13 3.5 Analog Output Option6HPF (High Precision Fast clock rate)
13 3.5.1 Physical Installation and Adjustment.
13 3.5.2 Analog Output Load Simulation
14 3.5.3 Connections and Specification
15 3.6 Installing an optional serial card into the GS3100 & Setting its Baud Rate.
16 3.7 Selecting Isolated or Non-Isolated Operation of Serial Option Cards 202, 207, 07 & 08.
16 3.8 Setting the baud rate for the GS3100's standard RS-232C serial output.
17 3.9 Connecting Load Cells.
18 3.10 Connecting to the Mains Supply.
18 3.11 Calibration and Setup keys - Access and Use.
18 3.11.1 General.
18 3.11.2 Use of keys and access to the settings.
19 3.11.3 Use of the GS3100's keys for calibration and programming.
20 3.12 Digital Setup - Programming the GS3100.
20 3.12.1 Accessing Digital Setup.
20 3.12.2 Digital Setup Settings.
21 3.12.2.1 Resolution in display divisions.
21 3.12.2.2 Decimal Places.
21 3.12.2.3 Count By.
21 3.12.2.4 Update Rate.
21 3.12.2.5 Standstill {not in motion}.
21 3.12.2.6 Zero Track.
21 3.12.2.7 Function Lock.
22 3.12.2.8 Set point Test.
22 3.12.2.9 Open/Closed.
22 3.12.2.10 Output.
22 3.12.2.11 MODBUS baud rate.
23 3.12.2.12 Serial Comms - Word Composition.
23 3.12.2.13 Stream Output.
23 3.12.2.14 Units.
23 3.12.2.15 Block Division Character.
23 3.12.2.16 Beginning and End Character.
24 3.13 Device Number - its description and instructions for setting it.
24 3.14 Weight Units Labels
25 3.15 Weight Calibration
25 3.15.1 General
25 3.15.2 Zero Out The Dead Load Offset
25 3.15.3 Span Calibration.
Table of Contents

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26 3.16 Connecting the Standard RS-232C Serial Output & the Set Point Control Outputs.
27 3.17 Electrical Specification of the GS3100's Set Point Non-Latching Outputs.
28 3.18 Spike and Transient Suppression of Switched Load Noise.
29 4 STANDARD RS-232C SERIAL OUTPUT COMPOSITION
30 4.1 Serial Data Word Composition and Serial Flow Control - XON/XOFF.
30 5 SERIAL INPUT DIAGNOSTICS
31 6 SERIAL OUTPUT OPTIONS - RS-422A, 20mA, Optically Isolated RS-232C
31 6.1 Available Serial Output Options, What they do and Why they are selected.
31 6.2 Physical Installation, Baud Rate Selection, Output Selection, Set up,Format & Isolation.
32 6.2.1 Optical Isolation, the Position of Links LK1 on the Option Card & the need for a 9VDC Supp ly.
32 6.3 Optional Serial Output Cards - Output and Power Supply Connections.
33 7 SERIAL INPUT/OUTPUT OPTIONS - RS-232C, RS-422A, 20mA CL,
RS-485
33 7.1 Available Serial Input/Output Options, What they do and Why they are selected.
33 7.2 Physical Installation, Baud Rate Selection, Input/Output Selection, Set up & Isolation.
33 7.2.1 Isolation, the Position of Links LK1 on the Option Card & the need for a 9VDC Supply.
34 7.2.2 Maximum Baud Rate, Delay in Responding and Timing. (Not applicable to MODBUS)
34 7.3 Device Number and Digital Setup Settings for serial I/O. (Not applicable to MODBUS.)
35 7.4 Optional Serial Input/Output Cards - Input/Output and Power Supply Connections.
36 7.5 GS3100's Serial I/O Language.
36 7.5.1 Communications Flow Control.
36 7.5.2 Avoiding Multiple GS3100s on the same RS-485 Bus “Talking” at the same time.
37 7.5.3 Time Out and Clearing the Command Buffer.
37 7.5.4 Acquiring Zero and Missing Commands.
38 7.5.5 Communication Language and Commands.
38 7.5.5.1 General Command & Reply Structure.
38 7.5.5.2 ID Number Command.
39 7.5.5.3 Set Point Commands.
40 7.5.5.4 General Purpose Commands that Control the GS3100 and Ask for the Weight.
41 7.5.5.5 Requests for Information Commands.
42 7.5.5.6 Terminal Mode, the GS3100 transmitted key codes & two Useful Brief Commands.
45 7.5.5.7 Table of ASCII Characters that can be displayed by the GS3100 (includes their hex equivalent).
45 7.5.5.8 Table of Hexadecimal values for ASCII characters.
46 8 MODBUS3100 - FACTORY FITTED MODBUS ASCII and RTU OPTION.
46 8.1 Introduction.
46 8.2 Serial Transmission Modes, Speeds and Slave Numbers.
46 8.2.1 ASCII Mode
47 8.2.2 RTU Mode
47 8.3 MODBUS Functions and Exception Response.
47 8.4 Timing Considerations.
47 8.4.1 Timing - ASCII mode versus RTU mode.
47 8.4.2 Timing - GS3100's time to Respond.
48 8.4.3 Timing - Baud Rate
48 8.5 GS3100's 20 Holding Registers.
50 8.6 Battery RAM - Additional “MODBUS3100" Option Features.
50 8.7 MODBUS Installation and Setup.
51 8.8 MODBUS Communications Testing/Demonstration.
52 9 TECHNICAL SPECIFICATION.
53 10 WARRANTY
Table of Contents

1INTRODUCTION & FEATURES.
The GS3100 is a high performance, high accuracy and high stability microprocessor based digital weight
indicator designed specifically as THE PERFECT Weigh/Batching Front End. The sensible size of the GS3100's
front panel, keyboard and display make it easy to read and use during manual operation and installation. The
very short case length and short cable connectors allow fitment into low cost small enclosures. The GS3100's
wide range of flexible settings will ensure its profitable application in a large number of applications, where it
really shines when used as the input device for Computer/PLC Controlled Batching and Weighing.
The GS3100 includes features NEVER SEEN BEFORE in weight indicators. It sets the benchmark by which
the usefulness of all other indicators used as “front ends” will be judged. Major features and benefits are:-
nNOW AVAILABLE (with version 8A) - Optional High Precision 14bit (1:16,000) 4-20mA and 0-10VDC
Analog Output using OPTION6HPF plus 100% & 0% Load Simulation for external equipment calibration.
nNOW AVAILABLE - MODBUS ASCII and RTU OUTPUT. The factory fitted Option “MODBUS3100"
provides full modbus RTU and ASCII serial I/O from 1200Baud to 19,200Baud with support for
multi-holding register read function 03 and single register write function 06. SLAVE number can be set from
01 to 99. By also selecting Option07 or Option08, users can choose the serial I/O level to suit their
application. Available I/O includes RS-232C; 20mA Current Loop; RS-422A or RS-485 MultiPoint. In
addition, the MODBUS option includes battery backed ram for tare, ID number and zero tracked value.
nNOW AVAILABLE with the release of SOFTWARE VERSION 7 or GREATER - PLC COMPATIBLE 8bit
SERIAL COMMUNICATIONS. You can now easily select the serial word type best suited to your application
- choose either 7bit with Even parity or 8bit with no parity. Word type selection as required by the MODBUS
standard remains fully automatic for MODBUS protocols.
nA World First. The first Digital Weight Indicator to be designed “from the ground up” as a “front end” for
Computer/PLC Controlled batching. It has all of the features and none of the hassles of competing products
which have to be “shoe horned” into the job. It is tailored for the job and fits perfectly.
nComputer/PLCs can talk to “factory floor” operators, via the GS3100, ACROSS the WORLD. The in-built
advanced serial I/O language, using optional serial I/O cards, allows the GS3100's keyboard and display to be
used as the PLC/Computer operator's interface - whether it be on the factory floor or, via a modem, on the
other side of the World. The remotely situated PLC/Computer can completely control the GS3100. In
addition to weight, set point and ID information, it can also request a vast range of information, including
many of the GS3100's installed settings, its product designation, software version and much more.
nSerial I/O Controlled Stream Weight Data Mode. The GS3100's serial I/O language includes commands
which enable the remote Computer/PLC to turn-on and turn-off the GS3100's serial weight stream mode. This
allows the remote Computer to request “high speed” weight data during critical weighing/batching periods
AND to “put to sleep” the GS3100 during periods when high speed weight data is not required.
nGS3100 as the remote Operator input device for the Computer. All front panel key operations can be sent to
the remote Computer. Immediately the Computer puts the GS3100 into “terminal mode”, all operations of the
GS3100's front panel keys are sent to the Computer and not acted upon by the GS3100. During all of this
time, the GS3100 continues weighing and set point operations without interruption.
nGS3100 as a remote message display for the PLC/Computer. Immediately the Computer puts the GS3100 into
“terminal mode”, the GS3100's display is completely under the control of the Computer. It will display any
messages sent to it and so, can be used by the Computer to “talk to” the on-floor operator. During all of this
time, the GS3100 continues weighing and set point operations without interruption.
nStandard “no-extra cost” RS-232 Serial Output. For Computer/PLC controlled applications requiring only
serial weight data, the GS3100 is perfect. Its standard RS-232C 4800/9600 baud output can be programmed
to send weight information, OR, weight information including the status of the alarm set points as well as the
operator ID information.
nFull Range of Programmable Settings. The GS3100's extensive range of keyboard programmable settings
allows it to be “customized” to suit any application. The content of the serial output can be extensively varied
to suit the application. So, too, can the operation of the set points and access to the keyboard functions.
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nAs standard - Dual Optically Isolated Set points for High and Low Alarms - a vital safety measure. The dual
set points can monitor the weight, “in-the background”, while the Computer/PLC is controlling the batching
process. In the event of a fault with the Computer, or with related equipment, the set points can trigger alarms
or close down the plant.
nFull SIX wire load cell connection. The GS3100 automatically and accurately compensates for long load cell
cable runs typical in weigh/batching applications. Competitors “cheap” products, which use only FOUR wires
cannot compensate for long cable runs and can produce errors in excess of 10% of reading as a result.
nAssured and Guaranteed Accuracy and Stability. Every GS3100 spends at least ONE DAY in our thermal
chamber cycled between equivalent operating temperatures of -10oCand +40oC. Their accuracy and stability
are continuously monitored and recorded. If they don't meet our specifications 100%, they don't get shipped.
Typically, actual shipped performance is FIVE to TEN TIMES MORE STABLE than our published
specification - you can rely on it.
nHigh Speed TWENTY PER SECOND operation tuned to provide rapid response. Slower update rates can
also be programmed during installation if required.
nInstalls into small low cost enclosures - 150mm Body length and 180mm total depth with connectors allows
installation into a standard 200mm depth enclosure.
nOperator friendly via the use of a colour coded layout with FIFTEEN sensibly sized 12mm keys and a large
14mm display.
nEasy to use, the front panel lamps and descriptions are clear. The method of entering set points and other
information is natural and easy to remember.
nHighly Reliable with a design based on 15 years of weighing electronics equipment design. Complete
“in-house” manufacturing and testing assures a long trouble free life.
nLow additional equipment costs. Powerful optically Isolated 0.5Amp 45VDC solid state outputs allow direct
connection to alarm or feeder solenoids driven by a user supplied low cost power supply.
nNot a Panel meter. The GS3100 is a proper full function weight indicator. It is designed and manufactured
by Gedge Systems who has international weights and measures approvals for weight indicators and
controllers.
nDisplay any weight to 199990. The wide ranging display of 6 digits allows virtually any weight to be
displayed. Weight settings include adjustable display resolution from 400 to 10,000 divisions in 100 division
steps, adjustable “count by” settings of 1, 2, 5, 10, 20 and 50 with adjustable decimal point - all set up via the
keyboard with easy to understand and remember settings.
nEasy to calibrate. No internal potentiometers or gain/zero switches within the GS3100. Calibration is
automatic via the front panel keyboard using easy to follow steps.
nEasy connections via 100% “plug and socket” connections. Special “short length” cable connectors with metal
back shells supplied as standard to reduce the required panel depth. The panel mounting hardware is supplied
as a no extra cost standard item.
nAdded security - the GS3100 records attempts to access its settings. Calibration and programming can only be
accessed by a secure key sequence. Every failed attempt to access the GS3100's settings is recorded. So too
is every successful access attempt. This information is displayed when power is applied, and so can be noted
by installation and supervisory personnel - it can also be transmitted to a remote Computer/PLC using the
GS3100's I/O features.
nQuality Assured. All features, operations, displays, outputs as well as standard and options connectors have to
meet a 100% performance test before shipping.
nA full record of manufacture. Gedge Systems maintains a detailed and full record of every product
manufactured. This record includes all of the extensive manufacturing test sheets and procedures, all linked to
the product's serial number and invoice number. We are able to repair our products quickly and economically
and return them to you just as they were manufactured.
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GS3100 Weigh/Batching Front End

2OPERATING THE GS3100
2.1 Introduction
The following section describes the operation of the GS3100 using its own front panel display, keyboard and
lamps. The GS3100 can also be operated entirely by a remote Computer or PLC, via an optional serial input and
output card. This method of operation is described in the OPTIONS section of this manual and only mentioned
briefly in the following.
2.2 Applying Power, Retained & Cleared Settings, Serial I/O Considerations.
Retained and Cleared Settings & Serial I/O Considerations: When power is removed, the GS3100 retains all
of its settings, including all of the calibration and setup information, the two set point values and the key zero
value. The only exceptions are: the Tare value; any zero tracked value and the ID number, all of which are
cleared and set to zero when power is next applied. In addition, any “flags” which were set during serial I/O,
will also be cleared. This point is particularly important if the remote computer is “locking out” the GS3100's
keyboard. The “lockout” flag will be cleared and keyboard access enabled when power is re-applied. Further, if
the GS3100 was being operated in “terminal” mode, it resumes operation in its normal mode when power is
re-applied. Remote control schemes should include techniques to frequently poll the GS3100 to determine its
status and, if necessary, re-apply the key locking and terminal mode functions.
{The GS3100 also clears the above mentioned settings following a proper calibration or setup procedure. It does
not clear them, however, following an unsuccessful attempt to gain access to the GS3100's CAL function.)
Messages when power is applied: When power is applied, the GS3100 loads its retained settings, clears the
above mentioned settings and “flags”, and then verifies its configuration. It then displays the below sequence of
messages which are followed by a display of the gross weight:-
3100.8A This identifies the product as a GS3100, with software version 8 installed. The GS3100 is type A.
3100.7b This identifies the product as a GS3100, with factory installed “MODBUS3100" Option fitted.
Software version 7 installed. The GS3100 is type b.
888888 The GS3100 “turns on” all the bars of its display and all of its six lamps to verify that they are
working properly.
Blank This is a blank display with nothing shown. The GS3100 “turns off” all the bars of its display and all
of its six lamps to verify that they are working properly.
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FCA002 “FCA” stands for Failed Calibration Access. The number shown is the number of times that someone
has attempted to gain access to the GS3100's calibration and set up settings but have failed to do so. This
number may change during installation due to the accidental operation of the wrong key by installation
personnel. This is not a problem. The number should be noted down when installation is complete, as any
change after that will indicate that someone has attempted unauthorized access to the GS3100 settings.
SCA002 “SCA” stands for Successful Calibration Access. The number shown is the number of times that
someone has successfully gained access to the GS3100's calibration and set up settings. This number will
change during installation. The number should be noted down when installation is complete, as any change
after that may indicate that someone has gained unauthorized access to the GS3100 settings.
2.3 Messages & their meaning including the 3 methods of locking the GS3100's keys.
The following messages may be displayed when power is applied, or during operation of the GS3100. The
explanation of the messages contains recommendations that should ONLY be carried out by personnel who are
fully qualified and authorized to do so.
Locd F Locked Key Function. This means that the key just operated has been locked out by the function lock
setting in Digital Setup during installation. See page 21.
Locd L Locked Keys “Lockout”. This means that the key just operated has been locked out by a remote
Computer or PLC sending a keyboard locking command to the GS3100. See page 40 and the factory installed
“MODBUS3100" Option.
Locd.tr Locked Keys in terminal restricted mode. This means that the key just operated has been locked out
by a remote Computer or PLC which has placed the GS3100 into the “terminal” but does not want the GS3100
to transmit the keyboard key codes. See page 42.
too Hi. Too High. This message is displayed when a set point value is being entered if the key just operated
would cause the value to exceed 120% of the GS3100's installed capacity. The message is displayed for 1
second, followed by a 2 second display of the allowed maximum value for the set point. The value being
entered is then displayed. It should be changed to ensure it does not exceed the maximum allowed value.
Err1 Error 1. The GS3100's factory settings are damaged and the GS3100 cannot operate properly. It must be
returned to the factory for testing and repair. There is no “in the field” solution for this problem.
-—-—-— The gross weight on the scale or in the weigh hopper is greater than the set up and calibrated
capacity of the GS3100. This may occur briefly as the weight on the scale approaches, and, due to impact
loading, overshoots the full capacity of the scale. The scale or system installer should be contacted to remedy
this, as it may indicate the possibility of damage occurring to the load cells due to the load overshoot.
OFF The electrical signal from the load cells is greater than the allowed input to the GS3100. This indicates a
serious problem, because the allowed input to the GS3100 is very large, regardless of how it has been
calibrated. Possible causes are: damaged load cells due to overload, lightning strike or welding. Damaged load
cell cables for whatever reason. Damaged load cell circuit to the GS3100. Incorrect connection to the GS3100
of the load cell cables. A failure of the GS3100's load cell input. If the GS3100 displays weight when a star
bridge or load cell simulator is properly connected to it, the fault will be in the load cell circuit external to the
GS3100. Contact the scale or system supplier to investigate the fault.
-OFF The electrical signal from the load cells is negative and greater than the allowed input to the GS3100. If
the load cells are “sitting on a bench”, and have no load upon them, this may not be a serious problem, as it
may just mean that the load cells unloaded electrical output is more negative than is usual. Try loading the
load cells to see if the displayed message disappears. Alternatively, try swapping the signal cables as they may
be connected in a way that makes the electrical signal go negative on load rather than positive.
If it is not any of these, then this indicates a serious problem, because the allowed negative input to the
GS3100 is large, regardless of how it has been calibrated. Possible causes are: damaged load cells due to
overload, lightning strike or welding. Damaged load cell cables for whatever reason. Damaged load cell circuit
to the GS3100. Incorrect connection to the GS3100 of the load cell cables. A failure of the GS3100's load cell
input. If the GS3100 displays weight when a star bridge or load cell simulator is properly connected to it the
fault will be in the load cell circuit external to the GS3100. Contact the scale or system supplier to investigate
the fault.
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GS3100 Weigh/Batching Front End

2.4 Front Panel Display
The GS3100's six digit display will normally
show the weight on the scale or weigh hopper,
with the Gross or Net lamp illuminated to indicate
the type of weight.
The display is also used while entering an ID
number or set point values. If this is the case, an 'i' will be displayed to the left of the number for ID entry. Set
point entry allows up to six digit numbers so the display will not include any messages while set points are
entered, but the lamps will tell you which set point it is.
In any event, the GS3100's display will always automatically return to a display of weight after 15 seconds of
inactivity when set point values or ID numbers are displayed.
Finally, the GS3100's display may contain none of these. Instead, it may contain a message that has been sent to
it from a remote computer or PLC (from across the room or across the world). If this is the case, the messages
and their meaning should be contained in the documentation supplied with your weigh batching systems. You
will need to contact your system supplier for details concerning this.
2.5 Front Panel Lamps
The GS3100's front panel contains six lamps as shown and described below:
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GS3100 Weigh/Batching Front End
The GROSS or NET lamps are only on when
weight is displayed. GROSS indicates that the
gross weight is displayed. NET indicates that
the displayed weight is the GROSS weight
minus a tare value (NET weight).
The COMMS lamp flashes when serial information is
received or transmitted by the GS3100. It only flashes
during the actual transmission, and so, if there are periods
of inactivity on the GS3100’s serial port, this lamp will be
off.
When the GS3100 is in the “terminal” mode, this lamp will
be off for most of the time. It will flash briefly when the
GS3100’s keys are operated as the key code is transmitted
to the computer and, as the computer transmits information
to the GS3100. There may be a fault with the serial output
if this lamp does not flash when serial information is
supposed to be transmitted. Alternatively, the GS3100 may
The ENTRY lamp will be on as follows:-
During entry of an ID number or set point value.
During operation of the GS3100 in “terminal mode”,
under the complete control of a remote Computer or
PLC. When operated in this way, the ENTRY lamp
illuminates immediately the GS3100 is placed in the
“terminal mode” by a command from the remote
Computer/PLC. It remains on until a front panel key is
pressed, when it goes off. The key value is then sent
to the remote Computer/PLC which can then send an
acknowledgement message to the GS3100’s display.
Receipt of this message by the GS3100 causes the
ENTRY lamp to again be turned on.
This lamp is not directly controlled by the remote
Computer/PLC - its operation is automatic and is
controlled by the GS3100 based on the above
operations.
If the GS3100 is used in the “restricted terminal
mode” this lamp is always off as the GS3100’s keys
are not transmitted to the computer in this mode.
The set point lamps SP1 and SP2 will be OFF all of
the time that the GS3100 is operated in the “terminal
mode”. At all other times, they will be ON when the
weight is equal to the set point or greater than the set
point and OFF when the weight is lower than the set
point. {The GS3100’s control outputs are closed and
conducting current when the set point lamp is ON and
open circuit when the set point lamp is OFF.}
Lamp ON if weight >= setpoint
Lamp OFF if weight < setpoint.
SP1 or SP2 lamp will also be ON while a set point
value is being entered at the keyboard.

2.6 Keyboard Controls
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GS3100 Weigh/Batching Front End
ZERO Zeros the gross weight and momentarily blanks the display to show that the operation was successful.
The ZERO key can be operated while NET weight or GROSS weight is displayed. Its operation has no effect
on any stored tare values and it does not switch from net to gross when operated in the net mode.
The ZERO key will not operate if it has been “locked out” during installation of the GS3100, or if the scale
is in motion, or the gross weight to be zeroed (including any value zeroed already) exceeds 2% of the installed
capacity of the weighing system.
The YES identity on the key is only for use and convenience during “terminal mode” operation.
PRINT Prints the weight or sends a print command to a remote Computer
or PLC. When the GS3100’s serial output has been installed to operate in the
printer mode, the display blanks and the COMMS lamp flashes following a
successful print operation. The GS3100 will not print if the scale is in motion.
The PRINT key is “buffered” for 2 seconds, and so, provided the scale
becomes still within this time, a print operation will occur.
If the GS3100 is sending stream weight data, the PRINT key operation
may also be sent, depending on the way the GS3100 is set up. If it is sent, the
COMMS lamp flashes and the display blanks briefly.
G/N The GROSS/NET key switches the weight display
between gross weight and net weight. During entry of set
point values or ID numbers it can be used to exit the
entry returning the GS3100 to its weight display mode
without saving the changes.
ENTER, ID#, SP1, SP2 and the numeral keys 0to 9. These keys are used to display and to enter ID numbers
and set point values. To display a setting, operate the appropriate key - ID#, SP1 or SP2. The current value will
be displayed. If you do nothing for 15 seconds, the GS3100 will automatically return to its weight display. The
GS3100 continues to check its set points and to drive it’s serial output even while ID numbers and set point
values are being changed. To change a value, first display it, then key CLEAR while the current value is
displayed. This tells the GS3100 that you want to make a change and it immediately clears the display. You then
use the numeral keys to enter the new value and key ENTER again to save it. The GS3100 momentarily blanks
its display to signify a successful operation. If you try to enter a set point value that is too large, the GS3100 will
warn you with a message “too Hi”. You can quit changing a value without affecting the existing setting by
keying G/N instead of the ENTER. When you key ENTER to save your new set point value, the GS3100
automatically adjusts the smallest increment to suit the GS3100’s set up and displays the adjusted value (for
example, it would make “3" a ”5" if the GS3100 was set up to count by 5).
TARE Acquires the gross
weight as a tare value and
switches the display to a net
weight of zero. Does not
operate if the scale is in
motion or if the function
has been “locked out”.
CLEAR During set point
and ID entry clears the
display to zero. CLEAR
must be operated after a set
point or ID# is displayed in
order to clear it and enter a
new value.