Rice Lake MSI4300 User Manual

MSI4300

PortaWeigh Plus

7 Key Version

Operator’s Manual

MSI4300/7

PORTA-WEIGH PLUS
CRANE SCALES
7 KEY VERSION

User
Guide

Quality
Industrial
Weighing
and Force
Measurement
Equipment

Measurement
Systems
International

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

TABLE OF CONTENTS

General Description............................................... 3

Unpacking..............................................................3

Liquid Crystal Display .......................................... 3

Backlight................................................................ 4

Batteries ................................................................. 4

Standard Features ..................................................5

Infrared Remote Control Features ......................... 6

Quick Keyboard Operation.................................... 7

Shifted & Secondary Functions............................. 7

Operation Guide .................................................... 8

POWER ................................................................. 8

ZERO..................................................................... 9

NET/GROSS ....................................................... 10

TARE ................................................................... 11

TOTAL ................................................................ 12

VIEW ∑ (total) ................................................... 15

TEST.................................................................... 16

SETUP ................................................................. 16

FILTER ................................................................ 18

UNITS ................................................................. 18

AUTO OFF.......................................................... 19

Infrared Remote Control...................................... 20

Lighting ............................................................... 20

Contrast................................................................ 21

HI SETPT (Setpoint) ........................................... 21

LO SETPT (Setpoint) ......................................... 22

Set Point Entry..................................................... 22

To Disable a Set Point ......................................... 24

PEAK HOLD....................................................... 25

Tare Memory ....................................................... 26

CLEAR ................................................................ 29

SELECT .............................................................. 30

ENTER ................................................................ 30

System Initialize .................................................. 30

Calibration (front panel) ...................................... 31

EIA-232-D Serial Output Option ........................ 34

Operation ............................................................. 36

Computer Operation of the

MSI Porta-Weigh Plus ......................................... 37

Porta-Weigh Plus Basic

Programming Example ........................................ 39

Specifications ...................................................... 44

Options ................................................................ 46

The MSI Limited Warranty ................................. 47

Proper Loading Procedures ................................. 48

Page 2 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

GENERAL DESCRIPTION

The Measurement Systems International Porta-Weigh Plus crane scale
represents a new level of technology and performance in the scale
industry. The MSI-4300 Porta-Weigh Plus is a computerized, self­contained, battery-operated crane scale. The scale is made up of three
separate sections which house the electronics, load cell and battery.
The sections are bolted together and sealed against moisture by the
use of O-rings. The scale housing is made of impact resistant cast
aluminum alloy. All electronics are shock mounted and the recessed
display window is impact resistant ADC Monomer that is much
tougher than polycarbonate.

A 16 bit microcontroller coupled with an alphanumeric display gives
unprecedented versatility and programmability. The advanced power
saving circuitry provides in excess of 2000 hours of operating time
from ordinary D cell alkaline batteries. The large, backlit, alphanu­meric display provides precise, unambiguous indication of operating
modes such as net, gross, and total. Digital calibration makes main­taining the scale a snap, and the single printed circuit board, fully
shock-mounted, marine-proof construction makes for a rugged and
reliable scale. To further enhance the versatility of the Porta-Weigh
Plus, a ruggedized, marine-proof, infrared remote control system can
access and control all the operating modes of the scale. The scale is
designed to meet or exceed the requirements of all regulatory agen­cies.

UNPACKING

LIQUID CRYSTAL DISPLAY

When unpacking the scale from the shipping container, ensure that all
parts are accounted for. Check the scale for any visible damage and
immediately report any to your shipper. It is advisable to use the
original shipping container when shipping or transporting the Porta­Weigh Plus.

The Porta-Weigh Plus is equipped with a large Liquid Crystal Display
(LCD) providing both weight indication and setup parameters. The
LCD is optimized for viewing in a cone beneath the scale, as the scale
is primarily used overhead. Direct head height viewing angle is
compromised. The best contrast is achieved when the scale is about a
foot or more above head height.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 3

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

BACKLIGHT

A display light for low light operation is standard with the Porta­Weigh Plus. This light is activated and deactivated by a photocell
which senses ambient light levels. In the "Automatic" mode, no
controls are required to activate the back light. Under the SETUP
menu (see SETUP in the operation instructions), the backlight can be
fixed on, fixed off, or set in the default AUTOMATIC mode.

If battery life is the primary consideration in using the Porta-Weigh
Plus, the backlight should be forced off (see SETUP). The backlight
alone uses 8 times the energy normally consumed by the scale. If the
backlight is left off the Porta-Weigh Plus will achieve greater than
2000 hours of operation.

6 Digit Weight Indication

International Motion Icon

Motion Indicator

Minus Sign

Center of Zero Icon

Low Battery Indicator

"Infrared Remote On" Indicator

MOTION

0

-

+

∑

AUTOREMOTE

BATTERIES

Page 4 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

METRIC

8

Character Message Display

"Auto-Total On" Indicator

Units

lb, kg, t, METRIC t

Liquid Crystal Display Detail

Type:
8 Standard “D” cells (NEDA/ANSI 13A, IEC LR20). Alkaline type is
preferred. Standard Carbon-Zinc can also be used, but this cuts the
available battery life in half.

Installing and Changing:

1) The batteries must have enough charge to ensure accurate
operation. (8 batteries in series must total more than 5.5V).

2) Turn the scale off.

3) Remove the battery tubes by turning the knobs counterclock­wise. It is not necessary to remove both tubes at once.

4) Replace the batteries with four fresh "D" cells in each tube;

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

polarity is indicated on the tube.

5) Reinstall the battery tube by inserting the tube back into the
scale and turning the knobs clockwise.

6) Option: The batteries can be checked with the test mode.
Power displayed is in relative percent of battery life. If the
number with fresh batteries is extremely low, (<10%) turn
power off, remove the tubes and check that the polarity of all
batteries are correct.

Rechargeable Batteries:
The Porta-Weigh Plus will operate efficiently with standard Ni-Cad
"D" cells. Batteries must be charged in an external battery charger.
Expect scale operation time to be from 1/4 to 1/2 that of alkaline.

STANDARD FEATURES

• Designed to meet or exceed all US and international stan­dards.

• Rugged construction throughout. Single PCB is shock
mounted and can withstand shocks in excess of 50G’s.
Switches are totally sealed and rated for over 10 million
operations.

• Precise high resolution 16 bit A/D conversion coupled with
advanced 16 bit Microcontroller provides world class
features and accuracy.

• Six large, 1.65 inch high digits for clear weight readings from
a distance.

Typical Weight Display

MOTION

Overload Display ("ERROR" flashes)

∑

AUTO

• Easy to read annunciation of measurement modes such as
NET or GROSS are provided on nine .825 inch high alpha­numeric characters. These are also used for menu prompts.

• Display illumination uses long life, EL backlighting coupled
with a transflective liquid crystal display. This provides
optimum display contrast under all ambient conditions from
full sunlight to total darkness. Operation is light-sensing
automatic or manually set.

• Exceptional battery life: Typically 2000 hours of continuous

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 5

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

use provided by 8 alkaline ‘D’ cells. Maximum battery life is
reduced by use of the backlighting; full time low light
operation will provide up to 400 hours of operation. A typical
operating cycle of 8 hours daylight use and 2 hours night use
will provide 10 months of operation on a single battery.
The Porta-Weigh Plus will automatically power down when
not in use (this feature can be disabled). And a low battery
indication appears when approximately 10% of battery life
remains.

• Easy to maintain: Full digital calibration assures reliable,
repeatable measurements.

• Selectable for lbs, kg, tons, and metric tons unless prohibited
by regulations.

• Automatic or manual weight totalization for loading opera­tions.

• Complete marine sealing ensures reliable operations under
harsh weather conditions.

• Anti-EMI shielding standard. Low emissions and susceptibil­ity.

• Easily customized for special applications.

• Up to 10 recallable Tare memories stored manually or
automatically.

• Peak Hold mode for stress analysis.

• 2 set points can be set for any in-range weight for operator
alerts or process control. External setpoint outputs available.
(Contact factory for information).

• Silicon elastomeric rubber switches, which are more rugged
than mechanical switches, provide 10 million operations.
They can withstand excessive impact without affecting
operation. Rubber membrane provides watertight seal.
Additional poly shield on underlay provides second layer of
integrity and prevents humidity contamination.

INFRARED REMOTE CONTROL FEATURES

The infrared remote control option allows all features of the scale to
be operated at distances up to 10 meters from the scale. This rugged
option is shock proof and waterproof. In addition to remote operation
of all the standard modes of the scale the following features are added:

• 9 ID codes. This feature provides the user with the ability to
store up to 9 separate totalizations. Keeping track of indi­vidual loads is simpler than ever. Each of the 9 totalizations
can go up to 999999 counts.

• Numeric entry of tare values and set points.

Page 6 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

∑

∑

∑

∑

∑

∑

QUICK KEYBOARD OPERATION

SELECT

∑

ENTER

POWER SHIFT

1 7654

ZERO NET/GROSS TARE TOTAL VIEW

0

SETUP PEAK HOLD TARE MEMORY

TEST

T

32

∑

CLEAR

1. POWER: Turns the scale on and off.

2. ZERO: Zeros the scale. Has full range to 100% of scale
(except for some legal for trade units).

3. NET/GROSS: Toggles the display between GROSS and
NET modes. To enter NET mode, a valid tare value must be
stored.

4. TARE: In GROSS mode, pushing this switch stores the
current weight reading as a tare value and switches the unit to
the NET mode. When in NET mode, pushing this switch
provides a brief display of the Tare value.

5. TOTAL: Pressing this will add the current weight to the
Total Register. The scale must return to zero before this
button can be used again. When in Auto Total mode, this key
is an Auto Total On, Auto Total Off toggle.

6. VIEW∑: Displays the total weight accumulated and the
number of weighments.

7. SHIFT: Used to shift to secondary functions and as an enter
key when inputting variables.

SHIFTED & SECONDARY FUNCTIONS

POWER SHIFT

TEST

1 7654

1. SHIFT POWER/TEST: Completes an LCD test, an internal
function test, indicates % remaining battery life and displays
the R calibration number.

ZERO NET/GROSS TARE TOTAL VIEW

0

SETUP PEAK HOLD TARE MEMORY

T

∑

CLEAR

SELECT

32

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

∑

ENTER

Page 7

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

2. SHIFT ZERO/SETUP: Enables the setup menus. Controls for
Units, Filtering, Backlight, Set Points, IR Remote, Auto
Power (off), and Total mode are found in the Setup menu.
(Legal-for-trade units may have a subset of these functions).

3. SHIFT NETGROSS/PEAKHOLD: Enables/disables the
Peak-Hold function. The highest reading is captured. Use
Shift-Clear to erase the current peak.

4. SHIFT TARE/TARE MEMORY: Enables the Tare Memory
menus. Use the Select and Enter yes to store and/or apply up
to 9 tare values.

5. SHIFT TOTAL/CLEAR: Used to Erase (Clear) Peak-Hold
values and numeric values. The Clear function is also a
useful shortcut out of various setup menus.

6. SHIFT VIEW∑/SELECT: The select key is used to scroll
through various menu choices in Setup, Tare and Calibration
menus. It is also used to input numbers for Setpoints, Tares
and Calibration.

7. SHIFT: Used in conjunction with the Select key to enter
selected values or parameters. This function of the Shift key
is only active when it is needed.

OPERATION GUIDE
POWER

Page 8 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

MOTION

0

-

+

∑

AUTOREMOTE

METRIC

Function:
Turns the Scale On/Off (toggle action).

Use:

1) The batteries must have enough charge to ensure accurate
operation. (8 batteries in series must total more than 5.4V).

2) Ambient temperature must be greater than -30°C and less
than 60°C (-22° to 140°F).

Action:

1) Push POWER button.

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

2) Display Check: All segments and the Total LED are illumi­nated for 1 second.

3) Message displays “MSI PAW+”, numerics give the software
version number (1 second).

4) During display test and MSI message, all internal operations
are checked and any nonconformance causes an error
message to be displayed.

Final:
Unit reads the current weight in the last set mode (NET, GROSS,
VIEW TOTAL, PEAK NET, PEAK GROSS).

ZERO

Function:
Sets the zero reading of the scale.

Use:

1) The scale must be stable. The scale will not zero if the
motion detect annunciator is on.

2) The scale must be in the Gross mode. The scale will not zero
in the Net or Total modes.

3) The scale will accept a zero setting over the full Range of the
scale (Legal-for-trade models might have a limited zero
range). Zero settings will subtract from the overall capacity
of the scale. For example, if you zero out 1000 lbs on a 5000
lb scale the overall capacity of the scale will reduce to 4000
lbs plus the allowed overrange amount.

Action:
Push ZERO button.
The weight reading must be stable within ±1 division. If this condition
is met the display reads “ZEROED” and the digits display 0 (or 0.0 or

0.00 depending on resolution). The zero setting is stored by the
backup memory, which will restore it the next time the system is
turned on.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 9

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

NET/GROSS

Function:
Switches the display between Net and Gross modes. Net Weight is
defined as Gross Weight minus the Tare Weight.

Use:

1) There must be a Tare weight established to switch from
Gross mode to Net mode (See Tare).

2) NET/GROSS will work even when the scale is in motion.

Action:
Push NET/GROSS.

• No current tare is stored (Tare = Ø).
No Action, display continues to read the Gross weight only.

• A tare value is stored:
Toggles between Net and Gross display modes. Display reads
“GROSS” or “NET”.

Page 10 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Note: The NET/GROSS key also functions while in the PEAK HOLD
mode. There is not a separate maximum value for PEAK NET and
PEAK GROSS. PEAK NET is computed from maximum gross minus
the tare value.

Final:
The display reads “GROSS” and the digits display “0” (or 0.0 or 0.00
depending on resolution).

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

TARE

Function:
Stores a Tare Weight (Gross Weight mode) or...Displays temporarily
the Tare Weight (Net Weight mode).

Use:

1) Only positive weight readings can be tared.

2) The scale will only tare when it is in the GROSS mode

3) The motion annunciator must be off, the weight reading must

be stable. The weight reading must be stable within ±1
division (Motion annunciator off).

4) Setting or changing the tare has no effect on the zero setting.

5) Taring will reduce the apparent overrange of the scale. For
example, if a 1000lb container was tared and the scale
capacity is 5000lb, the scale will overload at a net weight of
4000lb (5000-1000) plus any additional allowed overload
(usually ~4%) .

6) The tare value is stored in the backup memory, which will
restore it the next time the system is turned on.

Action:
Push TARE

• The scale must be in the GROSS mode: The entire range of
the scale can be Tared. If the motion condition is met the
display temporarily reads “TARE SET” and then converts to
a “NET” display and the weight digits register Ø. All
subsequent readings are deviations from the set Tare value.

Final:

• Tare is set, displaying NET weight.
Any subsequent pushes of the TARE key will display the
Tare value temporarily unless the NET/GROSS key is used
to return to the Gross reading.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 11

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

To remove the Tare Value:
Without erasing the value, push NET/GROSS. The Tare will remain
in memory until a new tare value is stored.

Note: A factory option is available that will erase the Tare by pushing
the TARE key when the weight is at zero.

TOTAL

Function:

For accumulation of multiple weighments. The accumulator always
uses the displayed weight, so Gross and Net readings can be added
into the same total. There are two modes of Totalizing which are set in
the Calibration SETUP section. The Manual mode requires that the
TOTAL key is pushed when the weight currently on the scale should
be added to the previously accumulated value. The Auto mode will
automatically add the last, settled, stable, value to the total. Both
modes require that the weight on the scale returns within 1% (relative
to full scale) of Gross Zero or Net Zero before the next weighing can
be added. Applied weight must be 2% of full scale or “Min e”
(whichever is greater) above Gross Zero or Net Zero before it can be
totaled.

Page 12 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Manual Total:
Use:

1) The motion annunciator must be off, the scale must be stable

±1 division. If there is considerable motion on the scale, use
the Medium or High Filter setting (see SETUP).

2) Only positive readings can be accumulated.

3) After a weighment is totaled, the weight on the scale must
return to below 1% of full scale capacity relative to Gross
Zero or Net Zero before another weight can be added to the
total. This assures that a weight on the scale is only added to
the total once.

4) When the total weight exceeds the display capability of
999,999 counts, or the total count exceeds 9999, dashes will

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

appear to reflect a display overflow. If you have a printer
option, the larger numbers can be printed through the use of
the PRINT button on the Remote, or with a computer
hookup.

Action:

Push TOTAL
The current weight is added to the total register. The total weight
along with the number of weighments is displayed briefly on the LCD.
(See VIEW TOTAL)

• Weight greater than 2% of full scale or “Min e” whichever is
greater (settable parameter-contact factory) :
Add the current reading (relative to the tared zero or Gross
zero depending on mode) to the contents of the accumulate
register.

• When a valid value is added, the display gives an indication
of the new total and how many weighments have been
totaled. i.e. 1 TOTAL , 2 TOTAL , 3 TOTAL, ...x TOTAL.
The Total accepted LED (center right of display) will also
light for 4 seconds providing additional indication that the
Total command was accepted.

To Clear the total:
Press VIEW∑, SHIFT & CLEAR .
Press VIEW∑ to exit View Total.

Auto Total:
Setup Option:
Allows for auto accumulate. When a weight threshold of 2% of full
scale or “Min e” (whichever is greater) above Net Zero or Gross Zero
is exceeded the accumulate function operates automatically. The
displayed weight is added to the accumulated value in the Total
Register only when the weight returns to zero (0±1% of full scale).
When a weight that meets the minimum accept limit, settles (no
motion), the Total LED indicator will flash three times. If the weight
changes to a new settled value the LED will flash again indicating that

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 13

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

the previous settled reading has been replaced. The last settled reading
is what will be used for totalizing when the scale returns to zero. The
user must take caution that when removing the load the scale does not
go out of Motion or a possibly erroneous reading could occur. The last
settled weight is actually added to the total when the scale returns to
less than 1% of full scale. The Total LED will flash for a steady 4
seconds indicating the weight has been totaled and the total value will
be shown briefly.

Note: MSI can modify or supply the Porta-Weigh Plus with a “maxi­mum settled weight mode” AutoTotal. Contact factory for details.

Action:

∑

AUTO

Page 14 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Push TOTAL.

1) The message "TOTAL ON" appears briefly, then "AUTO ∑"

annunciator.

2) Pick up the weight to be totalized. The LED will flash three
or more times when the weight is settled.

3) Set down the weight. The screen displays the new total and
will indicate “x TOTAL ” where x is the number of totaled
weighments up to 9999.

• The total key is used as a Total Enable, Total Off, toggle key
which is indicated briefly on the message display (i.e.
“TOTAL ON” or “TOTAL OFF”. Auto Totalizing will only
occur in the TOTAL ON mode.

• The Auto Total On mode is indicated by an “AUTO ∑”
annuciator on the LCD .

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

Rules for Auto Total:

1) The scale cannot be in motion. An auto total acceptable
reading is indicated by three or more short flashes of the
Total LED.

2) Weight readings must be greater than 2% of FS or “Min e”
(whichever is greater) relative to Net Zero or Gross Zero.

3) Each reading added to total must be preceded by a return to
zero (Net or Gross) ±1% of FS. Totalization of the last settled
weight is indicated by a 4 second flash of the Total LED.

VIEW ∑ (TOTAL)

Function:
Displays the current Total value and allows the total to be cleared.

Action:
To display the current Total Value:
Press VIEW ∑ .
The message display will read “TOTAL” and the total value is
displayed on the numeric digits. The Total Value will stay displayed
until VIEW∑ is pushed again. The number of totalized weighments is
displayed on the far left of the message display.

To clear a stored Total Value:
While in the “VIEW ∑” mode, press VIEW ∑, SHIFT & CLEAR .
The total reading and the number of weighments counter will revert to
zero.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 15

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

TEST

MOTION

0

-

+

Function:
Provides a functional system test, and an on-demand display check
without disturbing the current weighment. Also provides calibration
verification in the form of a load cell Calibration number.

Action:
To start the test sequence: Press SHIFT & POWER.

1) All digits (7 segment and 16 segment) count once from 0 to

9. All annunciators are tested including lb, kg, t, and the
Total LED.

2) Battery condition is displayed next in the form: % of Battery
life with a figure from 1 to 100 on the digits. The % battery
life will vary depending on whether the backlight is on or off.

3) The CAL number is displayed next. To ensure that the CAL
number is accurate the scale must be unloaded and in the
same units that it was calibrated in. The original CAL
number is printed on the right battery tube calibration label.
Cal number shifts of up to 10 counts are insignificant.

4) Internal tests are performed to further ensure scale integrity.

∑

AUTOREMOTE

METRIC

SETUP

Page 16 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Final:
Either the reading returns to the last condition, or an error message is
displayed.

Function:
Allows Front Panel entry of seldom set parameters.

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

Action:

1) Press SHIFT & SETUP to enter the Setup menu. The
message describes the parameter being set. To change the
setting of the parameter push ENTER . Options are viewed
by repeated pushing of the SELECT key. Selections are
stored with the ENTER key. Pushing the CLEAR key will
skip all remaining parameters and return the scale to normal
operation. Pushing the POWER key will also exit the setup
mode (and turn off the power).

Note: Not all the selections below are activated on every Porta-Weigh
Plus. Legal-for-trade issues and application issues require certain
menu items to be under the Calibrate menu (under seal, see calibration
section), and certain items to be disabled. Any or all menu items can
be eliminated under software control (contact factory for details).

Top Menu Sub-Menu Selections (highlighted selections are defaults)

FILTER LOW, MEDIUM, HIGH
UNITS POUNDS, KILOGRAM, TONS, METRIC Tons
AUTO OFF ENABLED, DISABLED
REMOTE ENABLED, DISABLED
LIGHTING AUTOmatic On, Off
CONTRAST (eight steps with message numerics at "123456")
HI SET PT HI VALUE Set value

MODE GROSS, NETGROSS, DISABLE
RESPONSE NORMAL, BLANK LCD, BLINK LCD (and Backlight)
EXIT? (exit Setpoint sub-menu)

LO SET PT LO VALUE Set value

MODE GROSS, NETGROSS, DISABLE
RESPONSE NORMAL, BLANK LCD, BLINK LCD (and Backlight)

EXIT? (exit Setpoint sub-menu)
TOTALIZE MANUAL, AUTOmatic
EXIT? Push ENTER to quit Setup, push SELECT to return to the top menu

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 17

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

FILTER

Use the LOW setting for most scale applications. It settles fastest and
is intended for general use. Use the MEDIUM setting when the scale
is being used under conditions that cause light to medium swinging.
Use the HIGH setting when there is a lot of scale motion. There is a
time penalty when using the HIGH setting. The user should wait at
least 5-15 seconds to ensure that the final reading has settled (motion
indicator off). (Not available in some legal-for-trade systems)

To change the filter settings:

1) Push SHIFT SETUP (Unless you are already in the Setup
menu).

2) The message should read "FILTER". If it does not, push
SELECT until it does.

3) Push ENTER. You are now in the Filter menu.

4) Push SELECT to change from LOW, MEDIUM or HIGH
settings. When the desired filter setting is displayed on the
message display, push ENTER.

5) Now you are back in the Setup menu. Push CLEAR to return
to normal operation or push SELECT to scroll to a different
setup operation.

UNITS

Page 18 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Units can be changed by scrolling through the choices with the
SELECT key and pushing ENTER when the desired unit is displayed.

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

The actual FS range of the scale is dictated by the units in which it
was calibrated in. For example, a 10,000 X 2 lb scale has a maximum
overload of 10,400 lbs. If the units were changed to kgs by the setup
menu, the range before overload would be 4717 kg (10,400 x .4536).
The resolution will round out to 1 kg in this example. (Not available in
some legal-for-trade systems).

To change Unit settings:

1) Push SHIFT SETUP (Unless you are already in the Setup
menu).

2) Push SELECT until the message display reads "UNITS".

3) Push ENTER. You are now in the Units menu.

4) Push SELECT until the desired units are displayed, then
press ENTER .

5) Now you are back in the Setup menu. Push CLEAR to return
to normal operation or push SELECT to scroll to a different
setup operation.

AUTO OFF

The AUTO OFF feature when enabled prolongs the battery life of the
scale by turning the power off after 1 hour of non use. Any time a key
is depressed (any key), or the detected weight is in motion, the 1 hour
limit is reset. Therefore the scale will stay on indefinitely if the weight
is changing or any key is pressed at least once an hour. This feature
defaults to the enabled mode when initially calibrated. When disabled
the scale will stay on, only the power key will turn it off.

To change the Auto Off mode:

1) Push SHIFT SETUP (Unless you are already in the Setup
menu).

2) Push SELECT until the message display reads "AUTO­OFF".

3) Push ENTER. You are now in the Auto-Off menu.

4) Push SELECT to toggle between "ENABLED" and "DIS­ABLED". When the desired mode is displayed, push EN­TER.

5) Now you are back in the Setup menu. Push CLEAR to return
to normal operation or push SELECT to scroll to a different

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 19

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

operation.

INFRARED REMOTE CONTROL

The infrared remote control option must be enabled in its setup menu
to operate. When enabled, the remote circuitry adds a slight drain to
the batteries even while the Scale is off. The approximate power-off
battery life with Remote enabled is 40,000 hours vs. a remote disabled
power-off battery life of 200,000 hours which exceeds the shelf life of
alkaline batteries. (The remote option is not available in some legal­for-trade systems)

To enable/disable the Infrared Remote

1) Push SHIFT VIEW (unless you are already in the Setup
Menu).

2) Push SELECT until the message display reads "REMOTE".

3) Push ENTER. You are now in the Remote menu.

4) Push SELECT to change between "ENABLED" and "DIS­ABLED". When the desired mode is displayed on the
message display, push ENTER.

5) Now you are back in the Setup Menu. Push CLEAR to go
back to normal operation or push SELECT to scroll to a
different setup operation.

LIGHTING

Page 20 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

The backlight is normally controlled by a photocell which detects
ambient light and determines if the backlight should be on or off
(AUTOmatic mode). Should the user desire the backlight can be
permanently enabled (ON mode) or for increased battery life, perma-

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

nently disabled (OFF mode).

To change the Backlight Mode:

1) Push SHIFT SETUP (unless you are already in the Setup
Menu).

2) Push SELECT until the message display reads "LIGHTING".

3) Push ENTER. You are now in the (Back) Lighting menu.

4) Push SELECT to change between "AUTO" (Automatic light
sensing mode), "ON" (always on) (Warning: drains batteries
at a higher rate) or "OFF". When the desired mode is
displayed on the message display, push ENTER .

5) Now you are back in the Setup Menu. Push CLEAR to go
back to normal operation or push SELECT to scroll to a
different setup operation.

CONTRAST

Used to optimize the contrast of the liquid crystal display at various
viewing angles. This is factory preset for optimal viewing from below
the scale. By accomplishing eight steps, the viewing angle can be
changed slightly to improve the contrast for other visual applications.

To change the Display Contrast:

1) Push SHIFT SETUP (unless you are already in the Setup
Menu).

2) Push SELECT until the message display reads "CON­TRAST".

3) Push ENTER . You are now in the contrast setting mode.

4) Push SELECT repeatedly to change the message display
contrast. There are eight steps. When the desired contrast
setting is reached, push ENTER .

5) Now you are back in the Setup Menu. Push CLEAR to go
back to normal operation or push SELECT to scroll to a
different setup operation.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 21

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

HI SETPT (SETPOINT)

When the weight exceeds the set value the Porta-Weigh Plus can
respond in a variety of ways. The normal response of the HI SETPT is
to turn on an open Drain MOSFET which can be used to drive relays,
lights, sirens, etc. (Contact the factory or your distributor for more
details). Other HI SETPT responses possible are to blank the display
or flash the reading on and off.

LO SETPT (SETPOINT)

When the weight falls below the set value, the Porta-Weigh Plus can
respond in a variety of ways. The normal response of the LO SETPT
is to turn on an open Drain MOSFET which can be used to drive
relays, lights, sirens, etc. (Contact the factory or your distributor for
more details). Other LO SETPT responses possible are to blank the
display or flash the reading on and off. The Lo Set Point can be
configured by customer order to become a second “greater than” a
value response. This is typically used in overload warning systems
and is standard in audible alarm option equipped units.

SET POINT ENTRY

A Set point is entered by the following procedure:

1) Press SHIFT ZERO to get into the Setup Menu.

2) From the Setup function, push the SELECT key until the
message reads “HI SETPT” (or “LO SETPT”)

INDIVIDUAL DIGIT FLASHES EVERY

TIME SELECT KEY IS PUSHED.

Page 22 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

2) Push ENTER. This accepts that the HI SETPT can be
entered.

3) The message display reads “HI VALUE”. Push ENTER.

4) The most significant digit flashes. Display reads “INPUT
WT”. Push the SELECT key until the first digit of the desired
weight value is displayed. Push ENTER. (The "CLEAR" key
can be used to change an entry if needed)
Note: To enter, for example, 100kgs on a 10,000 kg scale, the
first two digits should be entered as zeros (00100).

5) The next most significant digit flashes. Use the SELECT key
and the ENTER key to finish out the value entry.
Note: With the IR Remote the value can be directly entered)

6) After the entire Hi Set Point is entered the display will step to
“MODE”. Push ENTER. The first selection is “DISABLED”.
This mode allows the user to program a set point without the

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

setpoint actually operating. To enable the setpoint, push
SELECT until either the "GROSS“ mode or the "NET/
GROSS" mode is selected. In the “GROSS” mode the
setpoint will operate at the value set based on Gross Weight
regardless of any tare value being subtracted. If this is the
desired set point operation mode push ENTER. If the set
point should operate relative to a tared weight the
“NETGROSS” mode should be used. Use the SELECT key
to change from “GROSS” to “NETGROSS” and then push
ENTER. In this mode the set point will operate at the value
which represents either a Gross weight or a Net weight.

7) The next selection is the Set Point “RESPONSE”...what
should the scale do when the Set Point value is reached? Push
ENTER. There are now three selections: The “NORMAL”
response turns on the internal MOSFET which is connected
to a user supplied alert device such as a siren or strobe light.
Use the SELECT key to change the response to
“BLANKLCD”. In this mode the liquid crystal display
weight reading blanks out and the message displays HI
SETPT. The MOSFET functions as before. Use the SELECT
key again to change to the “BLINKLCD” response. Weight
readings continue, but the display alternates between a
standard weight reading, and a “HI SET PT” indication. In all
three modes, the overload condition will override the display
mode.

8) After the desired Set Point response is selected, push EN­TER.

9) The Set Point Menu is now back on the screen. The SELECT
key can be used to return to any of above operations
(VALUE, MODE, RESPONSE) if modifications need to be
made. To quit and return to normal scale operation use
SELECT until the message “EXIT?” appears and push
ENTER, or push CLEAR (no shift required). This returns
you to the Setup Menu. Again, push CLEAR to get out of the

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 23

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

menu and back to standard scale operation. Use the same
procedure for a Low Set Point.

TO DISABLE A SET POINT

Page 24 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

It is often useful to be able to set up a Set Point ahead of time and
disable it for testing purposes.

1) From the Setup function, push the SELECT key until the
message reads “HI SETPT” (or “LO SETPT”).

2) Push ENTER. This accepts that the HI SETPT is to be
modified.

3) Push SELECT until the “MODE” message appears. Push
ENTER.

4) Push the SELECT key until the message “DISABLE”
appears. Push ENTER. This disables the Set Point and
returns you to the Set Point Menu.

5) Push CLEAR two more times to get out of the SetPoint and
Setup menus, or using the SELECT key, scroll to the next
desired operation. To re-enable the Set Point, follow steps 1­3 above. On step 4 select the “GROSS” mode or the

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

“NETGROSS” mode.

PEAK HOLD

Function:
Allows the capture of a Peak Weight value. Useful for stress testing
and related operations where the maximum weight measured is stored.

Action:
Selecting Peak Hold converts the scale to a peak reading display
mode.

To Measure Peak Weight:

1) Select the appropriate filter for the application. The Low
filter converts to a special high speed filter used for the Peak
Hold mode only and should be used for peak hold applica­tions such as cable break tests and other fast transient events.
The Medium and High filters are best for maximum capacity
or peak load tests because these filters will tend to eliminate
peak values due to crane or boom “bounce”. See “Filters” in
the SETUP section for more information.

2) Push SHIFT PEAK HOLD. Display reads “PK GROSS” or
“PEAK NET”.

To Clear Peak Weight:
While the display reads “PK GROSS” or “PEAK NET” press SHIFT
CLEAR.

Note: The last peak value is saved even when not in the peak hold
mode unless it is cleared with the Shift Clear procedure above.

To Return to Normal Operation:
Push SHIFT PEAK HOLD. The message display will return to
GROSS or NET, whatever the last standard mode was.

Note: The Tare, Tare Memory, Zero, Total, and View Total functions
are disabled until the Peak Hold function is removed. Setup, Test,
NET/GROSS, and ID# (Remote users only) are still active.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 25

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

TARE MEMORY

Function:

• Allows storing and recalling a numeric or Semi-Auto Tare
value. Up to 10 digital or Semi-Auto Tare values can be
entered including the standard Tare available directly on the
keyboard.

• The following functions are available: Apply a previously
stored tare, store the current weight in Tare Memory (Semi­Auto Tare), enter a weight manually and store it in Tare
Memory (Keyboard Tare), modify a previously stored Auto
or Keyboard Tare.

Page 26 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Rules for Use:

1) The input value must be greater than zero and at least 1
display increment.

2) When storing an Auto Tare, the motion annunciator must be
off. The manual keyboard total function is independent of
motion and can be applied at any time.

3) Will not work in the Peak Gross or Peak Net modes.

4) Values can only be entered or applied when gross weight is
the current weighing mode. However, the values associated
with each Tare memory can be reviewed.

Action:
Selection is made of 1 of 10 Tare Memory values. The selection is
then Set or Entered into to store or modify. An empty Tare Memory is
designated by a zero and can not be used until a positive value is
stored.

To apply a stored tare value:

1) Push SHIFT TARE MEMORY.
The liquid crystal display provides the value and number of
the Tare memory. The numeric digits display the value stored

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

and the message display indicates the tare memory number in
the form of “TARE x” (where x equals the tare memory
number from 1 to 9 or is left blank for the base tare memory).
Note: An asterisk (*) character shows to the left of the
currently in use Tare Memory.

2) Use the SELECT key to scroll to the Tare Memory number/
value desired. Infrared remote users can key in the Tare
Memory number directly.

3) Push TARE .
The selected Tare Memory value is subtracted from the
current gross weight. The scale returns to standard operation
in the Net mode.
Note: To return to normal operation without changing the
Tare mode, push CLEAR (no SHIFT required).

To store the current weight as a tare memory (Semi Auto Tare):

1) Push SHIFT TARE MEMORY. The tare value is displayed.
The message provides the number (1-9) of the Tare Memory
in the form of “TARE x". Use the SELECT key to scroll to
the Tare Memory number that you wish to store the value in
(Infrared Remote users can key in the Tare Memory number
directly).

2) Push ENTER. This enables the store function. The message
display indicates "AUTO x" (where x equals the tare memory
number from 1 to 9 or is left blank for the base tare memory).
The numerics show the current gross weight reading.

3) Push TARE or ENTER . If Tare is pushed, the new reading is
applied immediately and the scale reads in the Net mode.
Steps 4 and 5 are skipped. The current gross weight reading
is transferred into the Tare Memory. If Enter is pushed the
value is stored but not applied.

4) The Tare Memory can now be applied by pushing TARE
(skip step 5), or a different Tare Memory can be selected
with the SELECT key.

5) To return to normal operation without applying a Tare, scroll
using the SELECT key until the message reads “EXIT?” and
push ENTER, or push the CLEAR key.

To manually enter a stored tare value (keyboard tare)

1) Push SHIFT TARE MEMORY.
The liquid crystal display provides the value and number of
the Tare memory. The numeric digits display the value stored
and the message display indicates the tare memory number in

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 27

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

the form of “TARE x” (where x = the tare memory number
from 1 to 9 or is left blank for the base tare memory). Use the
SELECT key to scroll to the Tare memory number that you
wish to store the value in. (Infrared remote users can key in
the Tare Memory number directly).

2) Push ENTER. This enables the "AUTO x" store function.

3) Push SELECT. This enables the manual keyboard tare value
entry. The message display reads "INPUT Tx". The far left
digit on the numeric display will flash. If a value was
previously stored the value flashing will be the last entered
Tare. This allows easy modification. All digits must be
entered, therefore small tare values must be preceded by
leading zeros.

Note: With Remote Control option, the Tare value can be
entered directly from the numeric keypad. Skip to step 6.

4) Use the SELECT key to change the flashing digit. When the
desired digit is displayed, push ENTER.

5) Repeat step 4 for the remaining digits.

6) When the last digit is entered the ENTER key is pushed again
to return to the Tare Memory menu, or the CLEAR key can
be used to delete the entire value and start over.

7) At this point the TARE key can be pushed to immediately
apply the new tare or the SELECT key can be used to select
another Tare Memory for entry or modification.

Page 28 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

To manually enter a stored tare value (keyboard tare):

1) Push SHIFT TARE MEMORY.
The liquid crystal display provides the value and number of
the Tare memory. The numeric digits display the value stored
and the message display indicates the tare memory number in
the form of “TARE x” (where x = the tare memory number
from 1 to 9 or is left blank for the base tare memory). Use the
SELECT key to scroll to the Tare memory number that you
wish to store the value in. (Infrared remote users can key in
the Tare Memory number directly).

2) Push ENTER. This enables the "AUTO x" store function.

3) Push SELECT. This enables the manual keyboard tare value
entry. The message display reads "INPUT Tx". The far left
digit on the numeric display will flash. If a value was
previously stored the value flashing will be the last entered
Tare. This allows easy modification. All digits must be
entered, therefore small tare values must be preceded by

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

leading zeros.

Note: With Remote Control option, the Tare value can be
entered directly from the numeric keypad. Skip to step 6.

4) Use the SELECT key to change the flashing digit. When the
desired digit is displayed, push ENTER .

5) Repeat step 4 for the remaining digits.

6) When the last digit is entered the ENTER key is pushed again
to return to the Tare Memory menu, or the CLEAR key can
be used to delete the entire value and start over.

7) At this point the TARE key can be pushed to immediately
apply the new tare or the SELECT key can be used to select
another Tare Memory for entry or modification.

To delete a stored tare value:
Note: This procedure is not usually necessary because a new tare
value can always be stored over an old value or the undesired value
can just be ignored. Some situations using the ID Number function
(See Infrared Remote section) may require that a tare value be deleted.
Also to disable the NET/GROSS operation the selected Tare must be
deleted.

1) Push SHIFT TARE MEMORY.
The message provides the value of the first Tare Memory in
the form of “TARE x”. Use the SELECT key to scroll to the
Tare Memory number/value that you wish to delete.

2) Push ENTER. Push SELECT. The numerics show the current
stored tare value with the left-most digit flashing.

3) Push CLEAR (no Shift required). The value will be elimi­nated and the memory location will indicate “0” on the
numeric digits.
Note: The entire value will clear only if the left most digit is
flashing. The Clear key will backstep delete any other digit.

4) A new Tare Memory can now be applied as described
previously. To return to normal scale operation without
applying a Tare, scroll using the SELECT key until the
message reads “EXIT?” and push ENTER, or push the
CLEAR key.

CLEAR

Function:
Used to clear numeric values and calculated values and to exit from

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 29

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

Setup menus.

Action:
Described per function. See Total, Set Points, Peak Hold, Tare
Memory.

SELECT

Function:
Used to enter numeric values and select stored Tare values and to
scroll through the setup menus.

Action:
Described per function. See Setup, and Total.

ENTER

Function:
Used to enter numeric values, setup parameters, and modify stored
Tare values.

SYSTEM INITIALIZE

Page 30 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Action:
Described per function. See Setup, Set Points, Tare Memory, and
Total.

This function should only be used when the operator is prepared for a
complete setup and Calibration procedure. Under no circumstances
should this procedure be initiated by the end user.

Function:
Clears the internal calibration settings. Starts the scale from the
beginning. Usually used for board replacement, troubleshooting, or
load cell replacement. This procedure does not alter factory features
settings.

Action:
To initiate a system initialization, push the SHIFT key and then push
the CALIBRATION key (inside the seal port). The message will
display “RESET”. A full calibration must follow this operation.

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

CALIBRATION (FRONT PANEL)

Function:
Calibration of the scale can be performed from the front panel after
being enabled by pushing the calibration switch behind the seal port.
To fully calibrate a Porta-Weigh Plus, the user is required to have an
accurate test weight system of adequate capacity and in the case of a
legal-for-trade Porta-Weigh Plus, the test weight system must be
certified by the appropriate regulatory agency.

Important Note: At any point, the calibration procedures can be halted
by turning the power off.

Action:
To enable Calibration; remove the seal port on the right side of the
scale. Press the switch button in the hole. The Calibrate Setup Menu
appears. Push the SELECT key to scroll through the various Calibrate
Setup menu choices. Once the desired operation is displayed, push
ENTER. To return to normal operation either scroll with the SELECT
key to exit and push ENTER, or push CLEAR.

Calibration setup menu:
Note: Some legal-for-trade Porta-Weigh Plus units have more menu
selections. The operation of these additional menu selections is
detailed in the Setup section of this manual.

Top Menu Selections

UNITS POUNDS, KILOGRAMS, TONS, METRIC Tons
STD CAL (perform a standard Cal)
FINE CAL (fine adjust the calibration)
CAL RCAL (Use the Rcal value for Cal)
AZM ENABLE, DISABLE
EXIT Push ENTER to quit setup, push SELECT to return to

the top menu

Note: Skip the units section if the units are not being changed from
what the scale was last calibrated in.

To select calibration units

1) Use the SELECT key to scroll to the “UNITS” message.
Push ENTER.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 31

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

2) Use the SELECT key to scroll through the Units options.
When the desired units are displayed, push ENTER.

Standard calibration:
Standard Calibration is to be used for normal test weight or cal fixture
calibration of the Porta-Weigh Plus.

1) Use the SELECT key to scroll to the “STD CAL” message.
Push ENTER.

2) The message reads “Ø SCALE”. Remove all weight from the
scale. When motion ceases push ZERO . Assuming the
detected zero weight is within acceptable limits the message
reads “WEIGHT” indicating it is time to add the test
weight(s).

3) Pick up a test weight of at least 20% of capacity. (Note: A
test weight of 50% or more of capacity is recommended for
highest accuracy.) A legal-for-trade unit must be calibrated at
80% of capacity or greater.

4) Use the SELECT key to cause the displayed reading to match
the value of the test weight.

Note: If the Select key is not pressed, the calibration weight
will default to the scale full capacity. When a match is made
push ENTER. Repeat for the remaining digits. When the last
digit is entered the scale should be steady, as this can affect
calibration accuracy. (Infrared Remote users can input the
number directly and must enter leading zero's.)

Page 32 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

For example: 5000 lbs of dead weights are available to
calibrate a 2500 kg scale. Since 5000lbs = 2268 kgs (5000 x

0.4536), the number entered with the select and enter keys
would be 2268.

5) Calibration is complete, push CLEAR to return to normal
scale operation, or push SELECT to choose another Calibrate
Setup function.

Fine calibration
Fine calibration is for minor adjustments to the calibration and is
usually not necessary. It is especially useful in hydraulic cal fixtures
for fine adjustments.

1) Use the SELECT key to scroll to the “FINE CAL” message.
Push ENTER.

2) Pick up a test weight of (or set the hydraulic tension to) at
least 50% of capacity. The weight is indicated on the numeric
digits.

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

WARNING: This function will not work unless the scale is loaded at
45% of capacity or more.

3) Use the SELECT key to cause the displayed reading to move
up slightly. Use the CLEAR key to cause the reading to move
down. Each push of the Select or Clear key causes the
calibration to shift by 1/4 displayed count. When the dis­played reading is acceptable push ENTER .

4) Fine Calibration is complete, push CLEAR to return to
normal scale operation, or push SELECT to choose another
Calibrate Setup function.

Calibrate with RCal
Calibrate with the Resistor Calibration number.

Caution: Cal RCal is for emergency calibration when test weights or a
calibration system is not available.

1) Remove the right (facing the back) battery tube. On the
calibration label is a printed RCal value. Make a note of the
value and reinsert the battery tube. Turn the scale power on
and push the calibrate enable switch behind the seal port.

2) Use the SELECT key to scroll to the “CAL RCAL” message.
Push ENTER.

3) The message reads “Ø SCALE”. Remove all weight from the
scale. Push ZERO. The scale will internally zero when
motion ceases and assuming the detected zero weight is
within acceptable limits.

4) Use the SELECT and ENTER key to cause the left most digit
of the displayed reading to match the RCal value noted
earlier. Repeat for the remaining digits. Push ENTER.
Note: The RCal value is stored in internal memory and will
show up as a default value. If this is the desired value just
push the enter key.

5) Cal RCal is complete, push CLEAR to return to normal scale
operation, or push SELECT to choose another Calibrate
Setup function.

To enable/disable AZM (Auto Zero Maintenance)

1) Use the SELECT key to scroll to the “AZM” message. Push
ENTER.

2) Use the SELECT key to scroll through the AZM options.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 33

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

When the desired mode "ENABLED", or "DISABLED" is
displayed push ENTER.

Caution: Disabling Auto Zero Maintenance will degrade temperature
and drift performance of the Porta-Weigh Plus.
Disabling the AZM is only intended for certification testing.
Under no other circumstances should the scale be used with the AZM
disabled.

When calibration is finished:
Seal the Calibration Port.

Calibration cycle:
Measurement Systems International recommends that the Porta-Weigh
Plus is calibrated at least once a year by a qualified scale technician
with certified calibration standards.

EIA-232-D SERIAL OUTPUT OPTION

Function:
The EIA-232 output is used in conjunction with the Infrared Remote
Control to output weight and total data to a printer or can be used for
two-way communications with a computer.

Page 34 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Electrical Conformance:
The electrical characteristics of the serial output is configured to
conform to the EIA Standard EIA-232-D. Cable connections include
RXD, TXD, Ground, CTS, and RTS. (CTS / RTS handshaking is not
currently supported, consult factory)

Configuration:
The Porta-Weigh Plus serial port option is factory configured only.
Standard data configuration is:

Baud Rate: 9600
Data Bits: 8
Parity: None
Start Bits: 1
Stop Bits: 1

By customer order, the standard configuration can easily be changed.
Available configurations include any combination of the following
settings:

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

Baud Rate: 300, 600, 1200, 2400, 4800, 9600, 19200, 38400
Data Bits: 7 or 8
Parity: None, Even, Odd
Start Bits: 1
Stop Bits: 1 or 2

Data Format:

Each transmitted reading consists of 24 to 33 characters including 10
customizable characters. The preamble (five characters) is intended

Data Field

# 1 sp X X X X X X X X sp Y Y Y Y Y Y Y sp Z Z Z

B C D E

Preamble

Post String

for

A

F

printer control characters but can be any ASCII characters. The post
string (five characters) is used for Line Feed or other end-of -line
control characters. In addition, there is a 5 character initialization
string transmitted when the Porta-Weigh Plus is turned on. These three
character strings are custom programmed to customer specifications
into the Porta-Weigh Plus at the factory. The standard configuration is
optimized for a 24 column printer, available from several manufactur­ers. Contact the factory for a list of plug compatible printers. The
transmitted data is grouped in fields, A through F, defined as follows:

A. Preamble field: up to 5 characters can be sent for control

characters and printer formatting. The standard configuration
eliminates the preamble.

B. ID Code Field: the first character is the number sign, the

second character is a digit from 1 to 9 indicating the ID
number.

C. Weight Field: eight characters of weight or total data. “0” to

“9”, including a minus sign and a decimal point if appropri­ate.

D. Mode Field: seven characters that indicate the printed weight

modes: GROSS, NET, TOTAL, PKGROSS, PKNET

E. Units Field: three characters that indicate the weight unit: lbs,

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 35

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

kgs, ton, mtn (Metric Tons)

F. Post String: up to five control characters used in printer

interfacing. Default character is LF (line feed).

OPERATION

The Porta-Weigh Plus serial port can be used in two modes:

Infrared Remote Control Option:
This is a print on command mode which works when the print button
on the remote control is activated.

Computer Control:
The computer can control and receive data from the Porta-Weigh Plus
through the use of simple ASCII commands. These commands can be
sent through the use of a data communications program, or a custom
Basic program.

The following table details the ASCII commands for controlling the
operation of the Porta-Weigh Plus model 4300.

Page 36 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

COMPUTER OPERATION OF THE MSI PORTA-WEIGH PLUS

FUNCTION ASCII Code Comments

Power Off A Power on must be from the Porta-Weigh Plus
Zero B Subject to motion rules
Net/Gross C Function toggles, query scale for current mode
Tare D Functions only in the Gross mode
Total E Add the current weight to the total register or in

auto-total mode, total on/off
View Total F Toggles, query scale for current mode
Calibrate G Internal switch must be pushed
Shift H Display test and diagnostics
ID Number I Must be followed by a number 1-9
Print J Will print the current display mode
Clear Selected Mode K Sets scale to
Test L Display test and diagnostics
Setup M Allows changing setup parameters
Peak Hold N Toggles, query scale for current mode
Tare Memory O Must be followed by a number 1-9
Clear P Will clear totals if in view total mode
Query Selected Mode Q Poll for current scale mode
Numerics 0-9 Used with Tare Memory, setpoints, etc.

GROSS Mode

The following functions are intended for factory internal use. Will not function unless the
seal port Calibrate and CLEAR keys are depressed immediately after power on.

Calibrate Clear R WARNING This completely clears the Calibra-

tion Constants

Manager Calibrate W Configuration manager calibrate mode

Manager Upload X Upload the scale configuration to host µC

Manager Download Y Download a new configuration from the host

µC to the Porta-Weigh Plus

The Porta-Weigh Plus does not have an EIA-232 input buffer. This
limits how fast commands can be sent. Some delay (~10ms) between
ASCII commands should be included in any software written to
control the Porta-Weigh Plus. The speed of data transmission is
limited only by the baud rate and the user interface. The response to a
print command is virtually instantaneous. However, transmission of
new, updated, data from the Porta-Weigh Plus is limited by the speed
of the A/D conversion, and the filter setting. The low filter limits the
data update to a 2 per second rate, the medium is about 1 per second,
and the high setting has about a 1 per 2 second update rate. These

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 37

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

speeds must be taken into account to prevent the printing of duplicate
date.

LO SETPT

HI SETPT

GND

TOTAL

GND*

TXD*
RXD*

RTS*

CTS*

+ 12V IN

* Standard EIA-232-D interface connections

Standard setpoint interface connections

End view of interface receptacle

When the EIA-232 option or setpoint option is used, the interface
receptacle shown is installed in the Porta-Weigh Plus front casting and
the mating connector is supplied. Pins 1-5 are for the EIA-232
interface and pins 6-10 are for setpoint interface.

Page 38 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

PORTA-WEIGH PLUS BASIC PROGRAMMING EXAMPLE

Note: The following BASIC program is intended as an example only.
Measurement Systems International does not guarantee that it will run
without modification on any personal computer. There can be signifi­cant timing and compatibility differences from PC to PC.

Programming Example:
This basic routine interrogates the scale as to what the currently
selected modes are, prints them, and then prints out the current
weights for GROSS, NET, TARE (A valid Tare Weight must be
stored prior to running this program), Peak GROSS, and VIEW
TOTAL. This routine is written in GW-BASIC and is configured to
operate out of COM Port 1. Baud rate and EIA-232-D configurations
are factory set to 9600 baud, 1 stop bit, 8 data bits, and no parity.

100 CLS:LOCATE 1:DEFINT A,Z: REM Initialize Screen
110 COMFIL$="COM1:9600,N,8,1,RS,CS0,DS0,CD0": REM Setup PC Comm Port
120 OPEN COMFIL$ AS #1
130 PRINT #1,"Q": REM Query PAW+ Selected Modes
140 A$=INPUT$(1,#1):A=ASC(A$): REM Input Mode Data
150 IF A$ < " " AND A$ > "/" THEN PRINT "ERROR Wrong Data Returned":GOTO130
160 IF A AND 1 THEN W$="ON " ELSE W$ = "OFF": REM Auto Total Mode
170 IF A AND 2 THEN X$="ON " ELSE X$ = "OFF": REM View Total Mode
180 IF A AND 4 THEN Y$="ON " ELSE Y$ = "OFF": REM Peak Hold Mode
190 IF A AND 8 THEN Z$="ON " ELSE Z$ = "OFF": REM Net Mode
200 REM Print current selected Mode status
210 PRINT "AUTO TOTAL IS ";W$;" VIEW TOTAL IS ";X$
220 PRINT "PEAK HOLD IS ";Y$;" NET MODE IS ";Z$
230 GOSUB 400:GOSUB 410: REM Set Gross Mode, Print GROSS Weight
240 PRINT #1,"C":GOSUB 410: REM Set Net Mode, Print NET Weight
250 PRINT #1,"D":GOSUB 410: REM Display Tare, Print TARE Weight
260 GOSUB 400:GOSUB 430: REM Reinitialize to GROSS, Delay
270 PRINT #1,"N":GOSUB 410: REM Set Peak Hold Mode, Print Peak Wgt
280 GOSUB 400:GOSUB 430: REM Reinitialize to GROSS, Delay
290 PRINT #1,"F":GOSUB 410: REM Set View Total, Print TOTAL Weight
300 END: REM End of Program,start of subroutines
400 PRINT #1,"K":RETURN: REM Set Gross Mode subroutine
410 GOSUB 430:PRINT #1,"J": REM Delay, then tell PAW+ to transmit
420 A$=INPUT$(24,#1):PRINT A$:RETURN: REM Capture data, print to screen
430 FOR I =1 TO 500:NEXT I:RETURN: REM Delay subroutine

Note: The time of the delay routine was set for a 20MHz CPU. Adjust
up or down as needed for other speeds.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 39

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

INFRARED REMOTE CONTROL

Operating the Porta-Weigh Plus with the Infrared Remote Control is
identical to operating the scale from the standard keyboard. However,
additional features are available using the remote and certain cautions
are warranted.

Page 40 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

The Infrared Remote is highly directional and requires fairly accurate
aiming to achieve the maximum operation range. The shape of the
remote is designed to help in aiming. Aiming becomes less critical as
the distance decreases. The differences between front panel operation
and remote operation are described below.

Remote Power On/Off:
To turn the Porta-Weigh on with the remote requires that the power
key is held down until the scale turns on... usually about 1 to 2
seconds. Power-on is the only function that requires more than a short
push of the button. Power-off is instantaneous. Holding down the
button on power-off might cause the unit to turn back on.

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

ID Number:
Up to 9 separate ID codes are available. Each ID code has a total
register, and a tare register. Weighing setups can be prearranged by
setting the ID number and establishing a Tare Memory for that ID
number. Then the next time that particular ID number is selected the
proper tare value is already established, and any previously stored
total value is enabled.

Action:
The ID number is changed by pushing “ID NUMBER” and then the
desired number (1-9). The default ID number is 1 which is the only
available ID without the remote.

Printing:
Pushing the Print key on the remote will cause the current displayed
value to be printed (requires EIA-232 option).

Action:

• To print the Gross, Net or Total values, first use the NET/

GROSS key or the VIEW∑ key to place the desired mode on
the display, then push PRINT.

• To print the Tare value: While in NET mode push TARE
followed by PRINT.

Caution: Do not accidently push the Tare key while in Gross mode as
this will clear the old tare and establish a new tare.

Numeric Entry
The Tare memory values and Setpoint values can be directly entered
from the remote. Instead of using the select key to scroll through
values, push the desired number directly. The Tare memory number
can also be accessed directly. (i.e. SHIFT - TARE - 3 will directly
select Tare memory #3).

REMOTE CONTROL BATTERY REPLACEMENT

Type:
Standard 9 volt (NEDA/ANSI 1604 A, IEC 6LR61). alkaline type is
preferred due to high LED peak currents. There is storage space for a
spare battery internal to the remote.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 41

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

When to Change:
The internal 9 volt battery needs replacing when the indicator LED is
no longer visible when any button is pushed. The operating range of
the remote will gradually decrease. When the range is insufficient for
your normal mode of operation, replace the battery (even if the LED is
still visible).

Installing/Changing:

1) Turn the remote unit over. Remove the three phillips screws
with a number 2 phillips head screwdriver.

2) Turn the unit right side up. Pop the front panel out by
applying pressure to the lower left corner of the blue urethane
case thus exposing a corner of the front panel / switch
assembly. With a flat screwdriver blade; carefully pry out the
switch from the urethane case by working the screwdriver up
the left edge of the switch assembly. Be careful not to insert
the screwdriver too deep as you may damage the internal
electronics.

3) Fold the switch assembly to the left side of the unit, exposing
the battery and the printed circuit board.

4) Pull the battery connector off the battery. Remove the battery
by tilting it up sideways.

5) Install the new battery by tilting it in sideways and wedging it
in the small indented region between the printed circuit board
and the case wall.

6) Reconnect the battery connector. Check for operation by
pushing any key on the front panel and ensuring that the
indicator LED is lighted. If it does not, check that the
keyboard connector is still seated properly and the battery is
fresh.

7) Replace the front panel / switch assembly by centering it over
the open area and pressing evenly around the edges until it
seals.

8) Replace the three screws. Make sure the screw seal gaskets
are in good condition.

Page 42 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Infrared Remote Comments:

• Due to the sensitivity required to allow for full sunlight
operation, it is possible to overload the input to the infrared
remote receiver in the scale if the remote is too close. This
situation is characterized by erratic remotely controlled
operation. The simple remedy for this is to not aim directly at
the scale, but aim slightly off center when very close.

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

• The range of the remote is optimized when the scale is 8 feet
or more off the ground. The infrared sensor is aimed slightly
down to help diminish sunlight overload. When the scale is
closer to the ground, aim the remote up into the infrared
window from below. If the scale is used normally very low to
the ground it is sometimes possible to bounce the infrared
signal off the ground and up into the sensor.

• Using SHIFT key functions requires that the keys are entered
in rapid fashion. If more than five seconds pass between the
SHIFT key and subsequent key presses, the scale will forget
that you pushed SHIFT. This could mean, for example, that
the scale will turn off rather than go into the test function
(Shift, Power).

• The ID# function has a five second maximum window for the
number entry otherwise the ID# will remain as before.

• As shipped, any Measurement Systems International infrared
remote will operate any Porta-Weigh Plus. It is possible, by
special order, to encode the infrared transmissions so that a
separate remote is required for each different Porta-Weigh
Plus. Up to eight channels are possible. Contact the factory
for more details.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 43

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

SPECIFICATIONS

Accuracy

±0.1% of applied load for all capacities 100,000 lbs (50,000 kg)
and below ±1.0% > 100,000 lbs (50,000 kg)

Maximum Resolution

12,500 displayed counts
50,000 to 80,000 counts internal

Standard Industrial Resolution

5000 displayed counts

Display

6 digit 1.6"/40 mm high numeric liquid crystal (weight display)
8 digit 0.8"/20 mm high alphanumeric liquid crystal display
(message / units display)
Annunciators for measurement modes
Sunlight visible light emitting diode indicator for Totalization
Photocell activated electroluminescent backlighting

Filtering:

Low, Medium, High (switch selectable)

Power:

8 standard D Cells

Operating Time:

2000 hours typical with occasional use of the LCD backlight. 400
hours with continuous use of backlight.

Temperature Range

-20° C to +60°C Operating (-4°F to 140°F)

-40°C to +80°C Storage (-40°F to 176°F)

Enclosure

NEMA IV, Alodined cast aluminum

Safe Overload

200% of rated capacity

Ultimate Overload

500% of rated capacity except 70,000 and 100,000 lb models,
450% of rated capacity

Hook

Crosby-Laughlin S-1 Timken Bearing swivel hook or equivalent

Top Eye Nut

500 through 30,000 pound capacity, Crosby-Laughlin or equiva­lent

Top Shackle

50/70/100,000 pound capacity, Crosby-Laughlin or equivalent

Page 44 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

OPTIONS

• NIST and OIML legal-for-trade approved (approvals
pending). Contact factory for US and International specifica­tions Class III and IIIL.

• Infrared full function remote control.
All functions are controllable with the MSI infrared remote
control. This weather sealed, pocketable device has an
outstanding range of up to 30 meters (100 feet) in ideal
conditions and 5 meters in broad daylight. Unit functions are
identical to the front panel with the addition of a Print
command (requires EIA-232 option), a 10 key numeric entry
capability, and adds ID code number entry with up to 9
totalization memories. Uses 1 or 2 standard 9V batteries.

• EIA-232 and external I/O .
2 way EIA-232-D communications are provided for interfac­ing the Porta-Weigh Plus to a remote printer or computer.
Requires cable pinouts.
External Setpoints: Provides 2 open drain contacts for
interfacing to external devices such as warning lights, process
relays, or sirens.
External Power: Allows connection of a 6 - 15 Vdc external
power source.

• Audible overload alarm.
Coupled with the internal setpoints, a single (pulsing) or dual
level (pulsing or steady tone) overload alarm can be set at
any weight. Can also be used for an in-limits or out-of-limits
indicator.

• AC power.
115 VAC 50/60 Hz or 230 VAC 50/60 Hz. Recommended
for stationary applications only.

• Extra loud siren.
114 dB loud siren for overload warning.

• Dual Load Cell.
A second slave load cell can be connected allowing summed
dual load cell operation. The load cell interconnect cable is
limited to 33’ (10 meters). Specify interconnect cable length.

• Substitute Stainless Steel Link for swivel hook.

• Oversized Top Lifting Eye or Shackle.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 45

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

THE MSI LIMITED WARRANTY

MEASUREMENT SYSTEMS INTERNATIONAL, INC., WAR­RANTS load sensing elements and meters against defects in work­manship and materials for a period of one year from date of purchase
and warrants electrical cables and batteries against the same defects
for a period of ninety (90) days from date of purchase.

Any device which proves defective during the warranty period will be
replaced or repaired at no charge; provided that the defective device
is returned to the Company freight prepaid.

In no event shall the Company be liable for the cost of any repairs or
alterations made by others except those repairs or alterations made
with its specific written consent, nor shall the Company be liable for
any damages or delays whether caused by defective workmanship,
materials or otherwise.

The Company shall not be liable for any personal injury or property
damage resulting from the handling, possession or use of the equip­ment by the customer.

Page 46 MSI-4300 Porta-Weigh Plus/7 Key • User Guide

The warranty set forth herein is exclusive and is expressly in lieu of
all other warranties, express or implied, including without limitation
any implied warranties of merchantability or fitness, or of any other
obligations or liability on the part of the Company.

The liability of the Company under this warranty is limited solely to
repairing or replacing its products during the warranty periods; and the
final judgement and disposition of all claims will be made by MEA­SUREMENT SYSTEMS INTERNATIONAL, INC.

M E A S U R E M E N T S Y S T E M S I N T E R N A T I O N A L

PROPER LOADING PROCEDURES

DO NOT

ZERO NET/GROSS TARE TOTALPOWER VIEW∑SHIFT

0

∑

T

SELECT

SETUP

TEST

DO NOT INTERFACE HARDWARE

(SHACKLES, HOOKS ETC.) THAT ARE

OVERSIZED AND RESTRICT SINGLE POINT

LOADING AND SELF-ALIGNMENT WHICH

CAN RESULT IN OFF-AXIS LOADING.

PEAK HOLD TARE MEMORY

ENTER

CLEAR

DO NOT

DO NOT

ZERO NET/GROSS TARE TOTALPOWER VIEW∑SHIFT

0

∑

T

SELECT

SETUP

TEST

PEAK HOLD TARE MEMORY

ENTER

CLEAR

DO NOT USE MULTIPLE ATTACHMENTS.

DO

ZERO NET/GROSS TARE TOTALPOWER VIEW∑SHIFT

0

∑

T

ENTERSETUP

TARE MEMORY

SELECT

PEAK HOLD

CLEAR

TEST

1. DO NOT PUSH OR PULL ON LOADED

SCALE. 2. DO NOT PULL LATERALLY ON

HOOK WITH SCALE LOADED.

PUB.PLP-01-95

ZERO NET/GROSS TARE TOTALPOWER VIEW∑SHIFT

0

∑

T

ENTERSETUP

TARE MEMORY

SELECT

PEAK HOLD

TEST

CLEAR

USE HARDWARE THAT CREATES SINGLE
POINT ATT ACHMENTS AND ALLOWS THE

SCALE FREEDOM OF ALIGNMENT.

MSI-4300 Porta-Weigh Plus/7 Key • User Guide

Page 47

MADE IN THE

USA

© 1997 by Measurement Systems International
Printed in U.S.A.
PUB.146-01-91B

Measurement Systems International

14240 INTERURBAN AVENUE SOUTH

SEATTLE, WASHINGTON 98168-4660 U.S.A.

WEB: www.msiscales.com • Email: [e-mail]

PH: 206-433-0199 • FAX: [phone]

A RICE LAKE WEIGHING SYSTEMS COMPANY

Measurement Systems

International

TM

14240 Interurban Avenue South Suite 200 Ɣ Seattle, WA 98168-4661 Ɣ USA

Phone: [phone] Ɣ Fax: [phone]

www.msiscales.com

©

2012 Rice Lake Weighing Systems