Salter Brecknell 304BP User Manual





Revision 1.0

July, 2003

Contents subject to change without notice.

Salter Brecknell Weighing Products.

1000 Armstrong Drive

Fairmont, MN 56031

Tel [phone]
Tel [phone]

Fax [phone]

E-mail: [e-mail]

Web: www.salterbrecknell.com.

Electromagnetic Compatibility Statement for Europe

PRODUCT PBS Series Directives with which this equipment complies:
Harmonized Standards applied:

EN 55022:1998 (Class B)
EN 61000-3-2:1995 + A1:1998 + A2:1998
EN 61000-3-3:1995
EN 55024:1998
EN 61000-4-2:1995 + A1:1998
EN 61000-4-3:1996
EN 61000-4-4:1995
EN 61000-4-5:1995
EN 61000-4-6:1996
EN 61000-4-8:1993
EN 61000-4-11:1994

Year in which CE mark affixed 2001 Date of issue October 2001

EMC 89/336/EEC EMC Directive
EMC 92/31/EEC EMC Directive
EMC 93/68/EEC EMC Directive



This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used
in accordance with the instructions manual, may cause harmful interference to radio
communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his/her own
expense.

2

TABLE OF CONTENTS

Page

Chapter 1: Introduction to the Salter Brecknell 304-BP Series Precision Balance......................... 5

Chapter 2: Getting Started.............................................................................................................. 6

Chapter 3: Operation ...................................................................................................................... 7

3.1 Display .......................................................................................................................... 7

3.1.1 Liquid Crystal Display (LCD)............................................................................ 7

3.2 Keyboard....................................................................................................................... 8

3.2.1 Function Keys .................................................................................................. 8

3.3 General Scale Operation .............................................................................................. 8

3.3.1 Weighing an Item............................................................................................. 8

3.3.2 Taring an Item.................................................................................................. 9

3.3.3 Clearing a Tare ................................................................................................ 9

Chapter 4: Advanced Features and Operation............................................................................... 10

4.1 Piece Counting.............................................................................................................. 10

4.2 Clearing the Piece Count.............................................................................................. 11

4.3 Memory Accumulator.................................................................................................... 11

4.3.1 Displaying the Memory Accumulator ............................................................... 11

4.3.2 Adding to the Memory Accumulator................................................................. 11

4.3.3 Clearing the Memory Accumulator................................................................... 11

4.4 Percentage Mode.......................................................................................................... 11

4.5 Display APW Mode....................................................................................................... 12

Chapter 5: Scale Configuration....................................................................................................... 13

5.1 Scale Configuration Overview....................................................................................... 13

5.2 User (“A”) Menu ............................................................................................................ 13

5.2.1 Entering the User Menu................................................................................... 13

5.2.2 Navigating in the User Menu............................................................................ 13

5.2.3 Notes on the User Menu.................................................................................. 14

5.2.4 Units Selection Procedure (A6)........................................................................ 15

5.2.5 Custom Unit Procedure (A7)............................................................................ 16

5.2.6 Exiting the User Menu...................................................................................... 16

5.3 Factory Setup (“F”) Menu.............................................................................................. 16

6.1 Scale Calibration Procedure ......................................................................................... 19

6.2 Calibration adjustment .................................................................................................. 20

3

Appendix A: Specifications................................................................................................................ 21

Appendix B: Serial Port Information .................................................................................................. 23

B.1 Serial Port Hardware..................................................................................................... 23

B.2 Serial Port Modes ......................................................................................................... 23

B.2.1 Demand Mode ................................................................................................. 23

B.2.2 Continuous Mode............................................................................................. 25

B.2.3 Recognized Host Commands .......................................................................... 26

B.3 Transmit APW Mode..................................................................................................... 26

Appendix C: Error Messages............................................................................................................. 27

C.1 Error Messages............................................................................................................. 27

C.1.1 Operator Errors................................................................................................ 27

LIST OF FIGURES

1-1 304-BP Series Front Panel..................................................................................................... 5

2-1 304-BP Back Panel................................................................................................................. 6

3-1 304-BP Display Detail............................................................................................................. 7

3-2 Function Keys Layout ............................................................................................................. 8

5-1 User Menu Key Assignments ................................................................................................. 13

5-2 User Menu Chart .................................................................................................................... 14

6-1 Calibration Mode Key Assignments........................................................................................ 19

B-1 Pin Assignments for DSUB9 serial port connector ................................................................. 22

B-2 Cable Diagram for Scale to PC............................................................................................... 22

B-3 Cable Diagram for Scale to Printer......................................................................................... 22

B-4 Demand Mode Output Format for Print Command ................................................................ 23

B-5 Demand Mode Output Format for M+ Command................................................................... 23

B-6 Demand Mode Output Format for MR Command .................................................................. 24

B-7 Continuous Mode Output Format ........................................................................................... 24

LIST OF TABLES

1-1 304-BP Series Product Matrix ................................................................................................ 5

3-1 304-BP Series Annunciator Definitions................................................................................... 7

4-1 304-BP Piece Counting Sampling Limits................................................................................ 10

4-3 304-BP Percentage Sampling Limits...................................................................................... 12

5-1 User Menu Chart .................................................................................................................... 14

6-1 304-BP Calibration Test Weight ............................................................................................. 19

4

CHAPTER 1: INTRODUCTION TO THE SALTER BRECKNELL 304- BP SERIES PRECISION

BALANCE

The 304-BP Series Precision Balance, available in several capacities, is a large capacity, affordable
balance designed for the classroom, laboratory or industrial applications. The 304-BP features 1:30,000
displayed resolution, a large, high contract LCD display and digital calibration. Weighing modes include
gram (kilogram), carat, avoirdupois pound and troy ounce. In addition, you may program one
additional custom unit. A “Plus” model is available that features 1:50,000 displayed resolution.

The scale is available in three weight capacities as illustrated in Table 1-1. The “Plus” model
matrix is shown in Table 1-2.

Prior to using the scale, please read this user’s guide carefully and completely. Store the manual
in a safe and convenient place so it will be available if you have questions concerning the
operation of the scale.

MODEL CAPACITY / GRADUATION

304-BP-300 300 x 0.01 g

304-BP -600 600 x 0.02 g

304-BP -1500 1500 x 0.05 g

304-BP -3000 3000 x 0.1 g

Table 1-1: 304-BP Series Product Matrix

Figure 1-1: 304-BP Series Front Panel

5

CHAPTER 2: GETTING STARTED

After unpacking the scale, a small amount of preparation is required before the scale can be
used. Please refer to Figure 2-1 below as needed.

Power Jack

Serial Port

Figure 2-1: 304-BP Back Panel

Step 1. Position the scale in its area of intended use. Observe the following guidelines for

suitable location.

1. Choose a firm, stable floor or table.

2. Do not share an AC outlet with electrical noise producing equipment, such as
refrigeration units. This includes products with electrical motors and/or relays.

3. Do not place the scale in an area with changing ambient temperature and/or high
humidity.

4. Do not place the scale in an area prone to exposure to direct sunlight, wind, or dust.

5. Do not place the scale in an area with vibrating equipment.

Step 2. Install the AC Adapter.

1. After placing the scale in its area of use, locate the AC Adapter.

2. Connect the female end of the AC Adapter to the connector on the rear of scale, and

then plug the adapter into an AC outlet. Make sure that the AC voltage appearing

at the wall outlet matches the input voltage marked on the AC adapter.

NOTE: Six AA size alkaline batteries may also be used to power the scale. The battery
holder is located underneath the scale. Please observe the indicated polarity when
installing the batteries.

Step 3. If applicable, install the serial printer.

1. Connect the printer to the 304-BP‘s interface port using the optional serial cable.

2. Configure the printer’s communication parameters as detailed in Chapter 5.

Step 4. Push the ON/OFF key on the front panel to begin use.

6

CHAPTER 3: OPERATION

CUMRMem

APW

ct

3.1 DISPLAY

The Model 304-BP series scale utilizes a 6 character LCD (Liquid Crystal Display) to

display the weight and system information.

3.1.1 LIQUID CRYSTAL DISPLAY (LCD)

Figure 3-1 shows the display detail of the 304-BP Series. The display consists of 6 numeric

characters, weight units and system status flags. Table 3-1 lists the various
annunciators you may see and their meanings.

-> 0 <­LowBat

Stable

ozt

FIGURE 3-1: 304-BP Display Detail

Annunciator MEANING

-> 0 <-

Low Bat

Stable

MR

Mem

APW

Center of Zero annunciator. Indicates that the scale is at gross zero.

Indicates a low battery condition. Check / replace the batteries.

This light is on whenever the scale is stable.

Indicates that the scale is briefly displaying the contents of the memory accumulator.

Indicates that there is a value greater than zero in the memory accumulator.

Indicates that the scale is displaying the APW (Average Piece Weight) in grams of
the items you are counting.

dwtoz

pcs

lb

gGN%

ozt

ct

CU

dwt, oz, lb, g,

GN

pcs, %

Indicates that the scale is currently weighing in troy ounces.

Indicates that the scale is currently weighing in carats.

Indicates that the scale is currently weighing in your programmed custom unit.

Indicates the unit of measure the scale is currently weighing in.

Indicates that the scale is currently in piece count (pcs) or percentage mode (%).

TABLE 3-1: 304-BP Series Annunciator Definitions

7

3.2 KEYBOARD

The keyboard is composed of eight function keys. Refer to Figure 3-2 for the overall layout
and key locations.

ZERO SAMPLE PRINT

M+

3.2.1 FUNCTION KEYS

Zero - This key sets the scale to display zero.
Sample – This key puts the scale into sampling mode, which is used for piece

counting. See Section 4.1 for more information.
Print - This key is used to send weight information out to the serial interface port. The

scale cannot be in motion or in an overload condition.
Units – This key toggles the scale among the available weight units. The available

weight units are lb, oz, g, pieces, %, GN, dwt, ct, ozt and custom unit. To see how to
turn some units off, see Section 5.2.4.

M+ – Pressing this key adds the displayed weight or pieces to the memory
accumulator. See Section 4.3 for more information.

MR – Pressing this key briefly displays the contents of the memory accumulator but
only if the Mem annunciator is lit. See Section 4.3 for more information

UNITS

SAVE

MR

MC

FIGURE 3-2: Function Keys Layout

ON

OFF

MC – Pressing this key clears the memory accumulator. See Section 4.3 for more

information.

On/Off - This key toggles the scale ON and OFF.

3.3 GENERAL SCALE OPERATION

3.3.1 WEIGHING AN ITEM

1. Select the desired weighing unit by pressing the UNITS key until that unit is

indicated on the display.

2. If necessary, press the ZERO key to obtain a weight reading of zero.

3. Place the object to be weighed on the scale’s platter and allow the weight

indication to stabilize. If the item weight exceeds the scale’s weight capacity, it
displays “oooooo”.

4. Read the weight shown on the display.

8

3.3.2 TARING AN ITEM

To weigh an item in a container, the weight of that container must first be subtracted
from the overall weight to obtain an accurate weight reading. This is known as taring.

1. Select the desired weighing unit by pressing the UNITS key until that unit is

indicated on the display.

2. Place the empty container on the scale’s platter and allow the weight indication to

stabilize.

3. Press the ZERO key.

4. Place the material to be weighed in the container and allow the weight indication

to stabilize.

5. Read the weight shown on the display.

3.3.3 CLEARING A TARE

1. To clear a tare, take everything off of the scale’s platter and press the ZERO key.

9

CHAPTER 4: ADVANCED FEATURES AND OPERATION

4.1 PIECE COUNTING

This mode is used to indicate the number of pieces of an item you have placed on the
scale’s platform and is accessed by pressing the SAMPLE key. To ensure accuracy, the
parts you are counting must be consistent in weight.

The scale uses the sampling method to determine the average piece weight (APW) of the
items you wish to count. When sampling items, always count the parts in your hand and
place them on the platform all at once. If the APW of the items is too light or the total weight
of the sample is too light, accuracy cannot be guaranteed. You will get an error message,
but piece counting will still be allowed. Consult Table 4-1 or Table 4-2 for minimum piece
weights and sample weights.

1. If the items you will be counting require a container, you must first tare the container off by
pressing the ZERO key.

2. Press the SAMPLE key. The scale will display “5 0 pcs”. The scale is prompting you to place
five identical items on the platform.

NOTE: If you wish to change the sample number, simply press the SAMPLE key
repeatedly until the desired sample number appears. Available choices are 5, 10, 20,
50, 100, 200, and 500.

3. Place the sample items on the platform all at once. Once the scale stabilizes, the scale will
display “5 – pcs”.

4. Press the SAMPLE key to take the sample. If the sample meets the limits shown in Table 4-1
or Table 4-2, the scale will now display the number of pieces on the scale. If it does not, the
scale briefly displays an “Lo”, but still allows piece counting. If this occurs, you should use a
higher sample amount to achieve better piece count accuracy.

NOTE: If the scale displays an “Add” message, the unit weight of the items you wish to
count or total sample weight is too light for your scale to process at all.

MODEL Capacity / Graduation Minimum Piece Weight Minimum Sample Weight

304-BP-300 300x 0.01 g 0.008 g 0.25 g

304-BP -600 600x 0.02 g 0.016 g 0.5 g

304-BP-1500 1500x 0.05 g 0.04 g 1.25 g

304-BP-3000 3000x 0.1 g 0.08 g 2.5 g

TABLE 4-1: 304-BP Piece Counting Sampling Limits

10

4.2 CLEARING THE PIECE COUNT

1. To clear the piece count, press the SAMPLE key to take a new sample.

4.3 MEMORY ACCUMULATOR

Your scale comes equipped with a handy memory accumulator, which can be used in
conjunction with the piece counting feature. As with a hand-held calculator, the memory
accumulator can be added to, displayed and cleared at anytime.

NOTE: This feature can be used in any weighing mode. However, the accumulator memory
is automatically cleared if the scale is switched to another unit of measure using the UNITS
key.

4.3.1 DISPLAYING THE MEMORY ACCUMULATOR

1. Press the MR key. The scale briefly displays the total value stored in the
accumulator but only if the Mem annunciator is lit.

NOTE: If a device is connected to the scale’s serial port, then that device will
receive an automatic printout of the number of entries made and as well as
the total value stored in the accumulator. See Appendix B for more detailed
information.

4.3.2 ADDING TO THE MEMORY ACCUMULATOR

1. Press the M+ key. The scale shows “Add”, lights the Mem annunciator,
and then adds the current value shown on the display to the memory
accumulator.

NOTE: If a device is connected to the scale’s serial port, then that device will
receive an automatic printout of that entry. See Appendix B for more detailed
information.

4.3.3 CLEARING THE MEMORY ACCUMULATOR

1. Press the MC key. The scale displays “Clr” to indicate that the memory has been
cleared and also extinguishes the Mem annunciator.

4.4 PERCENTAGE MODE

This mode is used to indicate the weight percentage of an item you have placed on the
scale’s platform relative to 100%. This is useful for filling and moisture determination
applications.

The scale uses the sampling method to determine the percentage value of 100%. Consult
Table 4-3 and Table 4-4 for acceptance criteria.

1. Press the UNITS key until the scale is in percentage mode, indicated by the % sign. The
scale should display “100 0 %”. If it does not, press the SAMPLE key.

2. If the items you will be counting require a container, you must first tare the container off by
pressing the ZERO key.

3. Place the reference item (100%) on the platform. Once the scale stabilizes, the scale will
display “100 – %”.

11

4. Press the SAMPLE key to take the sample. If the sample meets the limits shown in Table
4-3 or Table 4-4, the scale will now display 100%.

NOTE: If the scale displays an “Add” message, the weight of the reference item you
wish to sample is too light for your scale to process at all.

MODEL Capacity / Graduation Minimum Sample Weight Best Sample Weight

304-BP-300 300x 0.01 g 1 g 100 g

304-BP -600 600x 0.02 g 2 g 200 g

304-BP–1500 1500x 0.05 g 5 g 500 g

304-BP-3000 3000x 0.1 g 10 g 1000 g

TABLE 4-3: 304-BP Percentage Sampling Limits

4.5 DISPLAY APW MODE

This mode is used to indicate the Average Piece Weight (APW) of the items you are
counting in grams.

1. Sample the items you wish to count by following the procedure described in Section

4.1.

2. Press the UNITS key until the APW annunciator is lit. The scale now briefly displays

the current APW before reverting back to weighing mode.

12

CHAPTER 5: SCALE CONFIGURATION

5.1 SCALE CONFIGURATION OVERVIEW

The scale contains two main setup menus: The User (“A”) menu - which configures the
serial communication port and enables some user options - and the Factory Setup (“F”)
menu. Both menus consist of several menu selections, each with its own sub-menu of choices.

5.2 USER (“A”) MENU

5.2.1 ENTERING THE USER MENU

1. Turn OFF the scale.

2. Press and hold the UNITS key while turning the scale back ON.

3. When the scale shows “- - - - - -“, you may release the UNITS key. The scale
shows
“A 1”.

5.2.2 NAVIGATING IN THE USER MENU

Use the directional keys shown in Figure 5-1 to move around in the User Menu Chart
shown in Figure 5-2 on the following page.

1. To move to a new “A” heading, use the M+ (left) or MR (right) key to move right or

left in the User Menu Chart.

2. To move to the selection level, press the SAMPLE (down) key once. The

current saved selection is shown.

3. To view the available selections for the current “A” heading, use the M+ (left)

or MR (right) key to move through the selection field.

4. To save a new selection, press the PRINT (Save) key .To exit without saving,

press the ZERO (up) key to return to the current “A” heading.

5. Repeat Steps 2 through 5 until the User Menu is programmed.

Figure 5-1: User Menu Key Assignments

13

A1

Baud Rate

A2

Data Bits, Parity

A3

Transmission Mode

A4

Display Check

8n 7O 7E

2400 4800 9600

1200

600

A5

Auto Power Off

Off 1 3 5 10 15 20 30

A6

Units Selection

Press SAMPLE

key to begin

C d

A7

Custom Unit

Press SAMPLE

key to begin

Press SAMPLE
key to begin

A8

Serial Port Mode

1 2

0

Figure 5-2: User Menu Chart

5.2.3 NOTES ON THE USER MENU

1. Detailed descriptions of the user menu parameters can be found in Table 5-1 on the next
page. Factory-set defaults are shown in bold with a checkmark (√).

14

NAME/CODE DESCRIPTION CODE/VALUE

√√√√

A1

Baud Rate

A2

Data Bits and
Parity

A3

Mode of Serial
Transmission

A4

Display Check

A5

Auto Power Off
Period

A6

Units Selection

Selects the baud rate for data transmission through the serial port. 600

1200 2400
4800 9600√√√√

Selects the number of data bits and parity of serial transmission.

"8n" = 8 data bits with no parity bit and one stop bit

"7O" = 7 data bits with odd parity bit and one stop bit

"7E" = 7 data bits with even parity bit and one stop bit

Selects when data will be sent out of the serial port to a printer or
computer:

"C" = Continuous mode; send data continuously

"d" = Demand mode; send data when a PRINT command is issued

from the computer.

Actuates the function that illuminates all digit segments, decimal
points, and LCD annunciators in a test sequence. Pressing the
SAMPLE key to scroll down one level begins the test sequence.

Selects the auto off time period in minutes. Scale must be idle during
this period to shut off automatically.

"OFF" = Feature Disabled

Actuates the function that allows customization of the displayed
weight units. Pressing the SAMPLE key to scroll down one level
begins the sequence.

8n√√√√

7O
7E

C

d√√√√

Press SAMPLE
key to begin
sequence

OFF

5 10
15 20
30

Press SAMPLE
key to begin
sequence

1

A7

Custom Unit

A8

Serial Port
Mode

Actuates the function that allows setup of the custom unit. Pressing
the SAMPLE key to scroll down one level begins the sequence.

Selects the mode of the RS-232C serial port:

"0" = Full Duplex Mode

"1" = APW Transmit Mode

Table 5-1: User Menu Chart

5.2.4 UNITS SELECTION PROCEDURE (A6)

1. While in the A6.sub-menu, press the SAMPLE key. The scale illuminates the lb
annunciator and displays the current status (ON or OFF) of the lb unit.

2. Use the M+ key to toggle the status of the unit from ON to OFF.

3. Use the ZERO key to toggle among the available weight units.

4. Repeat Steps #2 and #3 until you have programmed all units.

5. Press the PRINT key to save all of your new settings and return back to the A6
sub-menu prompt.

Press SAMPLE
key to begin
sequence

0√√√√

1

15

5.2.5 CUSTOM UNIT PROCEDURE (A7)

The custom unit multiplier is the conversion factor that you would multiply grams
by in order to obtain the custom unit of weight. For example, if you wish to display
weight in troy ounces, you would enter in a multiplier value of 0.64301 ( 1 g =

0.64301 ozt). The scale automatically determines the proper display increment for
your custom unit.

1. While in the User Menu, scroll to "A 7", then scroll down once using the
SAMPLE key to enter the custom unit multiplier menu.

2. The display will momentarily show "C U" for the custom unit, followed by the
current value for the custom unit multiplier with the decimal point.

3. Use the left or right directional keys (shown in Figure 5-1 above) to move the
decimal point position to the correct position. Pressing the M+ key or the MR
key will change the position of the decimal point.

4. After setting the correct decimal point position, press the PRINT key to save
it.

5. The display will momentarily show "SET", followed by a value with one
flashing digit. This value will be the current multiplier value with the decimal
point position programmed above.

6. Use the four directional keys (shown in Figure 5-1 above) to adjust the
displayed value to the actual custom unit multiplier value. Increase the
flashing digit by pressing the ZERO key. Decrease the flashing digit by
pressing the SAMPLE key. Pressing the M+ key or the MR key will change
the position of the flashing digit.

7. After setting the exact value, press the PRINT key to save the custom unit
multiplier value. The display will show "EndCU" momentarily, then revert
back up to A7.

5.2.6 EXITING THE USER MENU

1. Exit the User (“A”) menu by first turning the scale OFF, then turning it back ON
without holding down any keys. The display will go through a digit check, then
settle into Normal Operating mode. All front panel keys will now return to their normal
mode of operation.

5.3 FACTORY SETUP (“F”) MENU

To enter the “F” menu, power down the scale. Press and hold the PRINT key while
powering on the scale until the scale displays a row of dashes (------) and beeps. Release
the PRINT key. Scale now displays F1. Use the left and right arrow keys to move to another
F number. Use the down arrow key to enter the F number. Use the left and right arrow keys
to view and select the choices. Press SAVE button to accept choice. Use up arrow key to
return to F menu.

To exit F menu, power off scale. Power on scale.

Refer to the “F” menu flow diagram and table for more information.

16

F1

30000

50000

60000

0

0.1

0.3

0.512345135

10

125

None

0.0

0.00

0.000

0.0000

Off10152025305012345102030

Grad

F3
Zero Track

F5
Motion Band

F9
Display Div

22
Creep Band

F24
Cal Adjust

F10
Decimal pt.

F23
Creep Time

F16
Zero Cal

Press Down Arrow
to begin

F17
Span Cal

Press Down Arrow
to begin

“F” Menu Flow Chart

17

PARAMETER

(Soft Key Text)

DESCRIPTION AVAILABLE

CHOICES

F1

Graduations

F3

Zero Track

F5

Motion Band

F9

Display
Divisions

F10

Decimal Pt.

F16

Zero Calibration

Specifies number of full-scale graduations. Value should be
consistent with legal requirements and environmental limits on
the useful system resolution.

Selects the range within which the scale will automatically zero.
Note that the scale must be in standstill to automatically zero.
Selections are in Display Divisions.

Sets the level at which motion is detected by comparing the
present display update with the previous one. If motion is not
detected for two seconds or more, scale is in standstill and can
process a Print or Zero command. Maximum value varies
depending on local regulations.

Determines the desired weight increments. Value should be
consistent with legal requirements.

Determines location of the decimal point. 0 0.0

Performs zero calibration. See chapter 6 for calibration

instructions

1,000 2,000
5,000 10,000
24,000 30,000
50,000

0d

0.5d√√√√

1d
3d
5d

1d√√√√

3d
5d
10d

1
2
5

0.00 0.000

0.0000

F17

Span Calibration

F22

Creep Tracking
(CrpTrk)

F23

Creep Time

F24

Calibration Adjust

Performs scale calibration. See chapter 6 for calibration

instructions

Sets the range within which the scale will attempt to offset the
effects of load cell creep. Use a lower setting for lower capacity
load cells and vice-versa. Selections are in seconds.

FACTORY SET – DO NOT CHANGE

Sets the range within which the scale will attempt to offset the
effects of load cell creep. Use a lower setting for lower capacity
load cells and vice-versa. Selections are in seconds.

FACTORY SET – DO NOT CHANGE

Allows experienced service technicians to adjust calibration to
compensate for linearity adjustments. USE WITH CAUTION

Off
10, 15, 20, 25, 30,
50,

1, 2, 3, 4, 5, 10,
20, 30,

18

6.1 SCALE CALIBRATION

1. Enter F menu by powering down scale. Press and hold the PRINT key while powering on the

scale until the scale displays a row of dashes (------) and beeps. Release the PRINT key. Scale
now displays F1.

2. Use the RIGHT ARROW key to move to F16 and press the DOWN ARROW key. Scale

displays C0 and then displays the zero counts. Press the ZERO key. Scale displays ZERO then

0. Press the SAVE key to accept and return to F16.

3. Use RIGHT ARROW key to go to F17. Use DOWN ARROW key to begin calibration. Scale

displays C1 then displays 0.00 with the right digit blinking. Use the LEFT ARROW key to
position the blinking cursor over the first digit of the test weight value. Use the UP ARROW
key to increment the digit to the test weight value. Place the test weight on the scale. The left
most digit blinks faster then slows. After weight has stabilized, press the SAVE key to accept
the fist cal point.

4. The scale displays SAVE, then SET then C2. Repeat step 3 for cal point 2 and cal point three.

5. To exit without performing three point calibration, press SAVE twice.

6. Scale returns to F17.

CHAPTER 6: SCALE CALIBRATION

Model Capacity/Graduation Test Weight

304-BP-300 300 g x 0.01 g 100g

304-BP –600 600 g x 0.02 g 100g
304-BP –1500 1500 g x 0.05 g 500g
304-BP –3000 3000 g x 0.1 g 500g

TABLE 6.1: 304-BP Calibration Test Weights

19

6.2 USING CALIBRATION ADJUSTMENT

1. This is an after scale calibration function. Be sure to have completed either single or multi

point calibration procedures before proceeding. This is not a substitution for scale calibration
but is a fine tuning tool to make small compensation adjustments.

2. Experienced service technicians may use the calibration adjustment feature to make fine

adjustments for critical applications.

3. Refer the to the “F” menu procedures and use F24.

4. Press the DOWN ARROW key.

5. The scale shows a regular scale display.

6. Place a test weight on the scale and view the results.

7. If the weight is slightly off, press the PRINT key and the right most digit blinks.

8. Use the UP or DOWN arrow key to adjust the digit.

9. Press SAVE to store and return to F24.

10. Repeat procedure with additional weight to adjust linearity.

20

APPENDIX A: SPECIFICATIONS

CONSTRUCTION:

Housings: Grey ABS
Sub-Platform: Metal
Platter: Plastic with Stainless Steel

Cover
Feet: Adjustable Non-skid Hard
Rubber

DISPLAY:

6 digit, 7-segment LCD

KEYPAD:

8-key Tactile Keypad

OVER CAPACITY ANNUNCIATION:

103% of Full Scale Capacity

PHYSICAL DIMENSIONS:

304-BP-300, 304-BP-600

OPERATING TEMPERATURE RANGE:

32°F to 104°F
(0°C to 40°C)

POWER SOURCE:

AC Adapter, 9VDC, 500 mA,
included

ALTERNATIVE POWER SOURCE:

6-AA alkaline batteries, replaceable

SERIAL PORT:

Full Duplex RS-232,
Female DSUB9

WEIGHT:

Net Weight: 3.0 lb (1.4 kg)
Shipping Weight: 4.8 lb (2.2 kg)

ø4.53 in [115 mm]

8.46 in [215mm]

7.87 in [200mm]

8.46 in [215mm]

ø4.53 in [115 mm]

2.84 in [72mm]

8.47 in [215mm]

304-BP-1500, 304-BP-3000

5.70 in [145mm]

2.84 in [72mm]

8.47 in [215mm]

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APPENDIX B: SERIAL PORT INFORMATION

Front View

B.1 SERIAL PORT HARDWARE

The COM1 serial port is a full duplex RS-232 port designed for connection to one of the following

devices:

• Serial receipt printer (dot matrix)

• Computer

• Remote display

• S-630 or S-650 Scale (to transmit APW)

Figure B-1 shows the serial port pin assignments for the scale’s female DSUB9 connector. Refer to

Figures B-2 and B-3 for some suggested cable diagrams.

1. Plug the serial printer or computer communication cable (not included) directly into the
scale’s DSUB9 serial port connector.

Pin No. Pin Name

2

Receive Data

3

Transmit Data

5

Signal Ground RS-232

Signal Level

RS-232
RS-232

Figure B-1: Pin assignments for the DSUB9 serial port connector

SCALE PC

2 RXDRXD 2

TXD 3

S. GND 5

DSUB9 DSUB9

3 TXD
5 S. GND
4 DTR
6 DSR
8 CTS

FIGURE B-2. Cable Diagram for Scale to PC

5

TXD 3

S. GND 5 7 S. GND

2

3

SCALE PRINTER

3 RXD

DSUB9 DSUB25

FIGURE B-3. Cable Diagram for Scale to Printer

22

B.2 SERIAL PORT MODES

B.2.1 DEMAND MODE

The scale provides a full duplex, demand serial transmission mode. This mode is

configured in the A3 sub-menu of the User Menu. See Chapter 5 for more
information. The demand mode allows control from a host device, such as
a PC, and can also be activated by pressing the PRINT key on the scale’s
front panel. Figure B-2 shows a suggested cable diagram for interface to a
PC.

Demand mode is also used when interfacing to a serial printer. Figure B-3 shows a

suggested cable diagram for interface to a serial printer.

Figure B-4 shows the serial output data format for demand mode when a PRINT command

is issued to the scale.

<STX> <POL> xxxxx.xx Units <CR> <LF>

Start
Transmission

Polarity:
<SP> = Positive
"–" = Negative

Weight Data

Units:
lb = pound
g = gram
kg = kilogram
pcs = pieces
oz = ounce GN = Grain
dwt = pennyweight

<SP>

Space

Carriage
Return

cu = custom unit
ozt = Troy ounce
ct = carat
pct = percentage

Line
Feed

FIGURE B-4. Demand Mode Output Format for Print Command

Figure B-5 shows the serial output data format for demand mode when an M+ (Memory

Plus) command is issued to the scale.

<STX> xxxxx.xx Units <CR> <LF>

Start
Transmission

<SP> x 2

2 Spaces

ASCII 43

<SP> x 4"+"

4 Spaces

Accumulator Entry

Units:
lb = pound
g = gram
kg = kilogram
pcs = pieces
oz = ounce GN = Grain
dwt = pennyweight

<SP>

Space

Carriage
Return

Line

Feed
cu = custom unit
ozt = Troy ounce
ct = carat
pct = percentage

FIGURE B-5. Demand Mode Output Format for M+ Command

23

Figure B-6 shows the serial output data format for demand mode when an MR (Memory

Recall) command is issued to the scale.

<STX> xxxxx.xx Units <CR> <LF>

Start
Transmission

Space

xxx <SP>

<SP>

Total # of Entries

Space

"T"

ASCII 84

Accumulator Total

Units:
lb = pound
g = gram
kg = kilogram
pcs = pieces
oz = ounce GN = Grain
dwt = pennyweight

<SP>

Space

Carriage
Return

Line

Feed
ct = carat
ozt = Troy ounce
cu = custom unit
pct = percentage

FIGURE B-6. Demand Mode Output Format for MR Command

B.2.2 CONTINUOUS MODE

The scale provides a full duplex, continuous serial transmission mode. This mode is

configured in the A3 sub-menu of the User Menu. See Chapter 5 for more
information. The continuous mode is used to interface to computers,
scoreboards, and other remote devices requiring constant data updating.
The transmission occurs at the end of each display update. Figure B-7
shows the serial data format for Continuous Mode.

<STX> <POL> xxxxx.xx Units <STAT> <CR> <LF>

Start
Transmission

Weight Data

Status:
<SP> = OK

M = Motion
Polarity:
<SP> = Positive
"–" = Negative

O = Overload

Units:
g = gram ct = carat
kg = kilogram

ozt = Troy ounce

Carriage
Return

lb = pound cu = custom unit

pct = percentagepcs = pieces
oz = ounce GN = Grain
dwt = pennyweight

FIGURE B-7. Continuous Mode Output Format

24

Line
Feed

B.2.3 RECOGNIZED HOST COMMANDS

“P” - This command is sent to the scale to print the indicated display. The scale will

not respond if the scale is in motion, positive overload or negative overload.

“Z” - This command is sent to the scale to zero the scale. The scale will not respond

if the scale is in motion, positive overload or negative overload.

“M” - This command is sent to the scale to add an entry to the accumulator (M+).
“R” - This command is sent to the scale to recall the contents of the accumulator

(MR).

“C” - This command is sent to the scale to clear the contents of the accumulator

(MC).

“U” - This command is sent to the scale to toggle among the configured units.

B.3 TRANSMIT APW MODE

The Transmit APW Mode is designed specifically for connection to any of the following TC
Series scale models:

• S-630

• S-650

•

•

Its purpose is to allow APW’s derived on the 304-BP precision balance to be

transmitted to a larger scale for actual piece counting there. Just press the PRINT
key at any time on the 304-BP to initiate the transmission. Consult your S-630, or S­650 scale manual for more information.

25

APPENDIX C: ERROR MESSAGES

C.1 ERROR MESSAGES

If the scale encounters an error condition, it will display a message alerting the operator. A
description of each display follows:

C.1.1 OPERATOR ERRORS

Message Explanation

“o o o o o o”

Indicates that the weighing capacity of the scale has been
exceeded.

Add Indicates that there is not enough internal resolution to

calculate the unit weight of an item. This means that the
items you are counting are too light for the scale to
process at all.

Lo Indicates that unit weight of the items you are sampling

is too light for the scale to process accurately.

O L Indicates that value in the accumulator exceeds the

display capacity of the scale.

Err 10

Err 11

Err 12

Scale cannot read serial number. Scale must be returned for
service.

Serial number mismatch. Re-enter setting code from product
ID tag.

Invalid setting code. Re-enter proper setting code from
product ID tag.

Note: Contact Service Department at Salter Brecknell for instructions on how to re-enter setting
code.

26