GSE 250 Reference guide

Brand: GSE

Model: 250

Type: Reference guide

GSE Model 250

Digital Indicator Series

Technical Reference Manual

Issue AC

GSE Model 250/250X Technical Manual

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

Page 8 250 Technical Reference

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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

• 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.

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

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

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

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

Page 12 250 Technical Reference

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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).

• 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.

• 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.

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.

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

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

(

)

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

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

)

Wire Load Cell Connection (250X)

Page 16 250 Technical Reference

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

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

ut to Rela

(

250X

)

Out

ut to PLC

(

250X

)

Output to Relay (250/250SS)

Output to PLC (250/250SS)

Version 2.4 Page 19

E-

-L

(

O-

-L

)

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

 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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GSE 250 Reference guide

Brand: GSE

Model: 250

Type: Reference guide

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GSE 250 Reference guide

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