GSE Model 250/250X Technical Manual
Copyright © 2008 GSE. All rights reserved.
Published by:
GSE
1525 Fairlane Circle
Allen Park, MI 48101
USA
Information in this Technical Reference Manual is subject to change without notice due to
correction or enhancement. The information described in this manual is solely the property of
GSE. This manual may not be distributed without written permission of GSE.
GSE Locations
GSE
1525 Fairlane Circle
Allen Park, MI 48101
U.S.A.
www.gse-inc.com
GSE Amprobe Europe GmbH
Phone: +49 (0) 2161-59906-11
Fax: +49 (0) 2161-59906-20
Version 2.4 Page 5
Table of Contents
Chapter 1: Introduction _________________________________________________ 9
Manual Set _______________________________________________________________________ 10
Document Conventions _____________________________________________________________ 10
Specifications _____________________________________________________________________ 11
Chapter 2: Installation _________________________________________________ 13
General Warnings __________________________________________________________________ 13
Electrical Safety ___________________________________________________________________ 13
Cleaning _________________________________________________________________________ 13
Panel Mount Template ______________________________________________________________ 13
Cable Connections _________________________________________________________________ 14
DC Power (DC PWR + DC PWR -) _____________________________________________________ 14
Load Cell Connection ______________________________________________________________ 15
Load Cell Signals ________________________________________________________________ 15
4 – Wire Connection _____________________________________________________________ 15
6 – Wire Connection _____________________________________________________________ 15
Communication Port Connection _____________________________________________________ 16
RS-232 Serial ___________________________________________________________________ 16
Printer Connection _______________________________________________________________ 17
Remote Key ____________________________________________________________________ 17
Remote Display _________________________________________________________________ 17
Setpoint Output Connection _________________________________________________________ 18
Model 250 _____________________________________________________________________ 18
Model 250X ____________________________________________________________________ 18
GSE-Link Option Connection (Opto-Link) ______________________________________________ 19
Connecting Shields ________________________________________________________________ 20
Chapter 3: Configuration _______________________________________________ 21
Basic Operation ___________________________________________________________________ 21
Display ________________________________________________________________________ 21
Status annunciators ______________________________________________________________ 22
Setup Mode Annunciators _________________________________________________________ 22
Selections and Options ____________________________________________________________ 23
Numeric Entry __________________________________________________________________ 23
Keypad ________________________________________________________________________ 23
Update Model 250 Firmware _________________________________________________________ 26
Chapter 4: Setup ______________________________________________________ 27
Accessing the Setup Mode __________________________________________________________ 27
Full Setup ______________________________________________________________________ 27
Safe Setup _____________________________________________________________________ 27
Setup Display Prompts ____________________________________________________________ 28
Setup Lock Out _________________________________________________________________ 28
Exit the Setup Mode ________________________________________________________________ 28
Page 6 250 Technical Reference
Groups and Items __________________________________________________________________ 29
GRP (Group) ___________________________________________________________________ 29
ITM (Item) _____________________________________________________________________ 29
Setup Parameters __________________________________________________________________ 29
Build _________________________________________________________________________ 29
Option ________________________________________________________________________ 30
Cal ___________________________________________________________________________ 31
Spec __________________________________________________________________________ 32
Serial _________________________________________________________________________ 34
Set.Pts or CheckW _______________________________________________________________ 35
Clock _________________________________________________________________________ 36
Test __________________________________________________________________________ 36
Factory ________________________________________________________________________ 37
End ___________________________________________________________________________ 37
Special Functions __________________________________________________________________ 37
None __________________________________________________________________________ 37
Test __________________________________________________________________________ 37
Count _________________________________________________________________________ 37
Units __________________________________________________________________________ 38
Hold __________________________________________________________________________ 38
Peak Hold ______________________________________________________________________ 38
Live Weight Averaging ___________________________________________________________ 38
Show Total (Accumulation) ________________________________________________________ 39
Chapter 5: Calibration _________________________________________________ 41
Calibration with Test Weights ________________________________________________________ 41
Zero __________________________________________________________________________ 42
Span __________________________________________________________________________ 42
Calibration with mV/V Entry _________________________________________________________ 42
DIR.ZER (Direct Zero Calibration Entry) _____________________________________________ 42
DIR.SPN (Direct Span Calibration Entry) _____________________________________________ 43
Using Linearization ________________________________________________________________ 43
ED.LIN (Edit Linearization Points) __________________________________________________ 43
CLR.LIN (Clear Linearization) _____________________________________________________ 44
Reset Calibration __________________________________________________________________ 44
Chapter 6: Approvals __________________________________________________ 45
Regular and Legal for Trade Modes ___________________________________________________ 45
NTEP Requirements ________________________________________________________________ 45
OIML Requirements ________________________________________________________________ 46
Audit Trail ________________________________________________________________________ 46
Physical Seal _____________________________________________________________________ 46
Chapter 7: Setpoints ___________________________________________________ 49
Setpoint Connection _______________________________________________________________ 49
Setpoint Operation (250 and 250SS) __________________________________________________ 49
Checkweigh Operation (250X) ________________________________________________________ 49
Chapter 8: Communications _____________________________________________ 50
Automatic Weight Output ___________________________________________________________ 51
Auto Weight Format String ________________________________________________________ 51
Printing __________________________________________________________________________ 52
Version 2.4 Page 7
Master Serial Output _______________________________________________________________ 53
Advanced Communication __________________________________________________________ 53
Using GSE View Software ________________________________________________________ 53
Protocol Summary _______________________________________________________________ 54
Example: Reading a Weight or Setpoint Value ________________________________________ 55
Example: Remote Keypress _______________________________________________________ 57
Example: Reading a Value in Hexadecimal ___________________________________________ 58
Example: Setting a Value _________________________________________________________ 61
Error Codes (Registers) ___________________________________________________________ 62
Chapter 9: Troubleshooting _____________________________________________ 63
Error Messages _________________________________________________________________ 63
Weighing Errors _________________________________________________________________ 63
Setup and Calibration Errors _______________________________________________________ 63
Diagnostic Errors ________________________________________________________________ 64
Appendix _____________________________________________________________ 65
Dimensional Drawings ______________________________________________________________ 65
Setup Menu Quick Reference ________________________________________________________ 69
Index _________________________________________________________________________ 71
Version 2.4 Page 9
Chapter 1: Introduction
The Model 250 series of indicators use the latest Sigma-Delta A/D technology to ensure fast and
accurate weight readings.
The setup and calibration of the Model 250 are stored digitally within non-volatile memory.
All versions of the 250 provide a method of easily connecting an RS-232 cable for temporary
communication for software upgrades or link to the GSE View software. Refer to page 53 for
more information.
Standard Model 250
The ABS plastic version of the Model 250 is available in wall/desktop and can be panel mounted.
It may be operated from either 4 AA batteries or a DC power source from 12V to 24V.
Figure 1: Model 250 Indicator
Model 250SS Panel Mount
The Model 250SS Panel Mount has a stainless steel face with a membrane keypad overlay. The
parameter map is the same as the Model 250.
The panel mount version may be operated from either 4 AA batteries or a DC power source from
12V to 24V.
Figure 2: Model 250SS Indicator
Page 10 250 Technical Reference
Model 250X
The Model 250X enclosure is rated as IP69K for severe washdown applications. The Model
250X may be operated from 9.6V, 12V or 24V batteries or a DC power source from 12V to 24V.
This version of the Model 250 is only available in wall/desktop.
Figure 3: Model 250X Indicator
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• Technical Reference Manual - Contains detailed information on calibration and setup. This
manual is intended for use by Scale Technicians who are installing the indicator.
• Operator Manual – Used for day to day operation of the indicator.
• Quick Start Manual - Intended for Scale Technicians who are familiar with the indicator and
simply need a quick reference for menu options and connection diagrams, etc.
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The following document conventions (typographical) are used throughout this reference manual.
Bold Text Bold text denotes words and phrases to note.
[KEY] A keypress while in the WEIGH MODE
<Key> A keypress while in the SETUP MODE. These keypresses are designated by the display
annunciators
Note: In the Specifications section the < symbol means less than and the > symbol means
greater than.
^ This symbol denotes one space (used in Automatic Weight Output on page 51)
⊗ Items marked with ⊗ indicate that the setting is available only in Full Setup and is trade
critical. When trade critical settings are changed the calibration counter will be incremented.
Version 2.4 Page 11
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250 250SS Panel
Mount
250X
Performance
Resolution Up to 30,000 divisions, minimum of 0.25 V/division, 20 updates/second
Zero Cancellation +/- 2.0 mV/V
Span Adjustment 0.1 mV/V to 3.0 mV/V full scale
Stability / Drift Zero: < 0.1
μ
V/°C (+ 8ppm of deadload max)
Excitation 5 volts for up to 4 x 350 or 8 x 700 ohm load cells (4 or 6 wire plus shield). Maximum load cell
resistance is 1000 ohms
A/D Type 24 bit Sigma Delta with +/- 8,388,608 internal counts
A/D Conversion Rate 20Hz with FIR filtering > 80db
Operation
Environment
Temperature: 14 to 122°F
ambient
Humidity: <92% non-
condensing
Storage: -4 to 122°F ambient
IP55 when panel mounted
Temperature: 14 to 122°F
ambient
Humidity: <90% non-
condensing
Storage: -4 to 122°F ambient
IP65
Temperature: 14 to 122°F
ambient
Humidity: 100%
Storage: -4 to 122°F ambient
IP69K
Setup and Calibration Full digital with visual prompting
Digital Filter 0.1 to 4.0 seconds
Zero Range Adjustable from 2% to 20% of full capacity
Electrical
AC Wall transformer: 110/240
VAC to 12 VDC @ 0.5mA
Wall transformer: 110/240
VAC to 12 VDC @ 0.5mA 100 – 240 VAC 50/60 MHz
DC
12 to 24 VDC (2.5 VA max)
4 x AA batteries (Alkaline
or rechargeable NiMH,
NiCad)
12 to 24 VDC (2.5 VA max)
4 x AA batteries (Alkaline or
rechargeable NiMH, NiCad)
12 VDC rechargeable NiMH
(optional) battery pack.
Enclosure
Material
ABS, Silicon Rubber,
Nylon, Acrylic (no halogen
used)
Stainless Steel face plate
Food grade plastic with stainless
steel mounting bracket
Mounting Desk, panel, wall or column panel Desk, wall, column
Dimensions
(Refer to page 65)
Desk: 6.5” (164mm) x 3.8”
(97 mm) x 3.2” (81mm)
Panel: 6.5” (164mm) x 3.0”
(77 mm) x 1.16” (29.5 mm)
7.8” (199mm) x 4.4” (112
mm) x 1.8” (44.5 mm)
9.8” (249.mm) x 6.4” (163 mm)
x 4.7” (119mm)
Features
Display LED backlit LCD with six 0.8” digits with 8 annunciators including units
Keypad 6 key silicon rubber 6 key membrane 6-key capacitive
GSE Link Infra-red connector for optional GSE-Link PC cable (to RS-232 PC port)
RS-232
Communication
RS-232 automatic transmit, network or printer outputs.
Transmission rate: 2400, 4800, or 9600 baud
Setpoints
2 isolated transistor drive
outputs (300mA total at
50VDC)
2 isolated transistor drive
outputs (300mA total at
50VDC)
3 isolated high side drive outputs
(400mA each at 12 – 24 VDC)
Function Key Unit switching, counting, manual hold, peak hold, live weight and accumulation
Battery Backed
Time/Date Battery life 10 years minimum
Linearization Five point linearity correction 10 point linearity correction
Approvals FCC, CE, NTEP FCC, CE, NTEP CE, NTEP
Shipping Weight 1.0 lb 5.0 lb 4.4 lb
Version 2.4 Page 13
Chapter 2: Installation
The following steps are required to set up the indicator.
• Inspect indicator to ensure it is in good condition.
• Use connection diagrams to wire up load cell, power and auxiliary cables as required.
• Use the template provided for hole locations.
• Connect power to indicator and press [ON/OFF] key to turn the Model 250 ON.
• Refer to the Setup Parameter section on page 29 for information on configuring and calibrating the
Model 250.
• To turn the Model 250 OFF press and hold [ON/OFF] key for three seconds (until display blanks).
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• Do not subject the Model 250 indicator to shock, excessive vibration or extremes of temperature
(before or after installation).
• Inputs are protected against electrical interference, but excessive levels of electro-magnetic radiation
and RFI may affect the accuracy and stability.
• The indicator should be installed away from any sources of excessive electrical noise.
• The load cell cable is particularly sensitive to electrical noise and should be located well away from
any power or switching circuits.
• For full EMC or for RFI immunity, termination of cable shields and correct grounding of the indicator
is essential.
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• For your protection all electrical hardware must be rated for environmental conditions of use.
• Make sure all AC powered equipment is installed near an easily accessible power socket outlet.
• To avoid the possibility of electric shock or damage to the Model 250, always switch OFF or isolate
the indicator from the power supply before maintenance is carried out.
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To clean and maintain the Model 250, never use harsh abrasive cleaners or solvents. Wipe the
indicator with a soft cloth slightly dampened with warm soapy water. For the stainless steel
models, use a cleaner specifically for stainless steel.
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Use the panel mount template (included with the Model 250 and Model 250SS) for drill hole
locations. The template indicates positions for the two 4mm mounting screws through the panel.
Also displayed on the template is the position of the rectangular hole that should be cut to allow
for the connection of cables. The drilling template supplied with the indicator allows for front or
rear machining of the panel.
Page 14 250 Technical Reference
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All cable connections are made to the rear of the Model 250 using screwless terminals. The
Model 250SS and 250X indicators will need to have the rear cover removed to access the
connection terminals. The Model 250SS uses screwless terminals where the Model 250X uses
screw in terminal connectors.
Wires must be stripped of insulation by at least 3/8” (10mm). It is not necessary to tin the ends of
the wire with solder or to add crimp ferrules to the wires. However, these techniques are also
compatible with the terminals and may ultimately make for a neater job.
To install wires in the Model 250 and Model 250SS, depress the lever located beside the terminal
required and push wire into the hole. Release the lever and pull gently on the wire to ensure it is
secure in the terminal. Refer to the corresponding drawing below.
To install wires in the Model 250X, remove the load cell connector and loosen the screws. Insert
the wires in the designated position of the connector and tighten the screws. Gently pull on the
wire to ensure it is secure in the connector. Refer to the corresponding drawing below.
NOTE: For wash down and severe wash down environments, be sure to avoid splicing
communication cables, load cell cables or home run cables. Splicing cables may cause water
wicking of the cable and jeopardize the integrity of stainless steel and IP69K enclosures. Make
sure all cables are sealed on both ends to prevent water damage.
250/250SS Load Cell Connection 250X Load Cell Connection
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The DC supply need not be regulated, provided that it is free of excessive electrical noise and
sudden transients. The Model 250 series indicators can be operated from a high quality AC wall
transformer as long as there is sufficient capacity to drive both it and the load cells.
The Model 250X offers two DC power variations. A 12 VDC rechargeable NiCad battery for
portable severe wash-down applications or supply your own DC power from a car/truck battery.
The battery pack option uses an external charger.
Version 2.4 Page 15
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LOAD CELL SIGNALS
Very low output scale bases may be used but may induce some instability in the weight readings
when used with higher resolutions. Generally speaking, the higher the output, or the lower the
number of divisions, the greater the display stability and accuracy.
The indicator can display the milliVolt-per-Volt reading that can be used to check scale base
signal output levels. For more information, refer to SCALE (Scale Base Test Display) page 36.
The Model 250 will accept either 4-wire or 6-wire load cell cable connection. To correspond with
the actual cabling installation the indicator must be configured in setup to the correct setting. For
more information, refer to CABLE (4-Wire or 6-Wire) page 30.
4 – WIRE CONNECTION
The minimum connectivity requirements are the connection of four wires (i.e. Excitation + and -
along with Signal + and -). Internally the indicator has a precision analog switch that can be used
to connect the Sense + and - lines directly to the Excitation + and - lines.
Any addition to the load cell manufacturer's cable length using 4-wire connection, is only
recommended for short cable runs. Where long additions to cable lengths are needed, a 6 wire
extension is required.
The BUILD:CABLE parameter must be set to 4 to allow for 4-wire connection. Refer to CABLE
(4-Wire or 6-Wire) page 30.
6 – WIRE CONNECTION
The excitation and signal lines are connected the same as for a 4-wire installation. The extra two
wires should be connected to the Sense + and Sense – terminals.
The BUILD:CABLE parameter must be set to 6 (the default) to allow for 6-wire connection. Refer
to CABLE (4-Wire or 6-Wire) page 30.
6-Wire Load Cell Connection (250/250SS)
6-Wire Load Cell Connection (250X)
4-Wire Load Cell Connection
(
250/250SS
)
4
-
Wire Load Cell Connection (250X)
Page 16 250 Technical Reference
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This section provides diagrams to illustrate the terminal connections.
RS-232 SERIAL
Connection between the indicator and computer DB9 or DB25 serial port (RXD, TXD, GND)
DB25 RS-232 - Indicator to PC (250/250SS)
DB25 RS-232 - Indicator to PC (250X)
DB9 RS-232 - Indicator to PC (250/250SS)
DB9 RS-232 - Indicator to PC (250X)
Version 2.4 Page 17
PRINTER CONNECTION
Connection between the indicator and printer DB25 serial port (RXD/TXD, GND and DTR))
REMOTE KEY
The indicator requires a voltage free contact between TXD and RXD to enable the remote key
input and the SPEC:REM.FN parameter must be set. Refer to page 34 for configuration details.
NOTE: The remote input will not function when in setup or when using the Opto-Link.
REMOTE DISPLAY
The remote display documentation should be referred to for connection details. Connect TXD to
RXD and GND to GND on the remote display.
Remote Display Connection
WARNING
Do not connect voltage to the remote key input switch or connection terminals. Connection of any
active circuitry may damage the indicator.
Remote Key Input Connection (250/250SS)
Remote Key Input Connection (250X)
DB25 RS-232 - Indicator to Printer
(250/250SS)
DB25 RS-232 - Indicator to Printer
(250/250SS)
Page 18 250 Technical Reference
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MODEL 250 AND 250SS
The output drivers for the Model 250 are isolated open emitter transistor drives that are capable
of driving up to a total of 300mA. This configuration allows for the direct connection of the
indicator outputs to most PLC types.
The voltage applied to the COM terminal appears on the output lines (i.e. OUT1 and OUT2) when
the outputs are active (e.g. to connect to a PLC connect +24V to the common terminal). The
outputs can then be connected directly to PLC inputs so when activated the PLC will see the 22V
signal (approx. - the exact switch loss will depend on loading of the output).
To drive external loads (e.g. relays), connect the relay coil positive supply to the output common
and the output line directly to one side of the relay coil. Connect the other end of the relay coil to
the negative supply. It is recommended that fly-back diodes or transient suppressors be fitted
across relay coils to limit switching noise.
MODEL 250X
The output drivers for the instrument are high side drive and are capable of driving up to 400mA
each. This configuration allows for the direct connection of the instrument outputs to most types
of PLC.
The voltage applied to the instrument’s positive power supply terminal (+) appears on the output
lines (Over, Pass and Under) when the outputs are active. The outputs can then be connected
directly to PLC inputs.
To drive external loads (eg. relays), connect the output line directly to the positive side of the
relay coil. Connect the negative side of the relay coil to COMMON. It is recommended that fly-
back diodes or transient suppressors be fitted across inductive loads such as relay coils to limit
switching noise.
Out
p
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(
250X
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Out
p
ut to PLC
(
250X
)
Output to Relay (250/250SS)
Output to PLC (250/250SS)
Version 2.4 Page 19
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A temporary infrared communication link can be established between the Model 250 and a
computer using the GSE-LINK cable option. The GSE-LINK cable can be used to transfer setup
and calibration information from a computer. It can also be used to download software upgrades
to the Model 250 from a PC.
The computer end of the GSE-LINK cable is a standard female DB9 connector. The indicator
end of the cable consists of an infrared transceiver, which attaches to the left side of the Model
250 display. To facilitate a quick and simple connection, the infrared transceiver is secured in
place by a permanent magnet located within the head of the GSE-LINK.
Refer to GSE-LINK Activation on page 25 for more information.
Figure 4: GSE Link Option Attachment
WARNING
The GSE-LINK head contains a strong magnet and care should be taken with it's proximity to
electronic media (e.g. credit cards, floppy disks, etc.) and/or other electronic instrumentation.
Page 20 250 Technical Reference
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To obtain full EMC or for RFI immunity, cable shields MUST be connected to the ground lug on
the rear of the indicator.
Figure 5 illustrates an example of possible connections. Also shown are the connecting cables
restrained using cable ties fastened around the cable strain relief anchors.
Figure 5: Cable Shield Connection
Care should be taken when connecting shields to maximize EMC or RFI immunity and minimize
ground loops and cross-talk (interference) between indicators.
For full EMC or for RFI immunity, termination of the cable shields at the ground (earth) lug is very
important. The ground lug of the indicator must be separately connected to ground potential via a
reliable link.
The Model 250 should only be connected to ground via a single reliable link to avoid ground
loops.
Where each indicator is separately grounded, interconnecting cable shields should be connected
at one end only.
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