Pennsylvania 7100 Series User manual

1
Value You Can Count On!
Pennsylvania Scale Company
Model 71/72/7300 Series Scales
Operation
&
Calibration
Manual
Pennsylvania Scale Company
1042 New Holland Avenue
Lancaster PA 17601
For online interactive tech support or more information on Pennsylvania
Scale products, visit our website at www.pascale.com
Part Number UM-12199
Version 4.02
Revised January 31,2003

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71/72/7300 SERIES SCALES
OPERATIONS MANUAL -SECTION 1
CONTENTS
INTRODUCTION 3
INSTALLATION AND SET-UP 4
DIAGNOSTICS 5
OPERATION
OPERATIONAL FEATURES 6
EXTERNAL CONNECTORS 6
DISPLAYS AND INDICATORS 6
PUSH-BUTTON FUNCTIONS 7
WEIGHING
WEIGHING WITHOUT TARE 8
WEIGHING WITH TARE 8
BI-DIRECTIONAL SERIAL ASCII INTERFACE
INTRODUCTION 9
COMMUNICATION 9
CONNECTOR PIN-OUT 10
TYPICAL CABLE WIRING 10
COMMAND FORMATS 11
SCALE COMMANDS 12
SAMPLE COMPUTER PROGRAM 14
ERROR MESSAGE LIST 16

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71/72/7300 SERIES SCALES
PROGRAMMING/CALIBRATION -SECTION 2
CONTENTS (cont’d.)
INTRODUCTION 18
7X00 SERIES CALIBRATION 19
DATA ENTRY EXAMPLE 21
7X00 CALIBRATION PROCEDURE22
CALIBRATION STEPS 24
BUILDING A FORMATTED PRINT 28
FORMATTED PRINT CODES 30
COMMAND FORMATS 32
RS-232 SCALE COMMANDS 33
RS-232 COMMUNICATION
CONFIGURATION 35
RS-232 PRINT CODES 36
RS-232 SERIAL INTERFACE 36
CALIBRATION COMMANDS 38
CALIBRATION EXAMPLE 40
“CAL” COMMAND 41

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INTRODUCTION
This operating manual covers the followingPennsylvaniaScaleproducts.
Model Description
7100 Smartbase with no internal display or push-buttons.
7200 Smartbase with internal display and no push-buttons.
7300
Scale with internal display and zero, unit, and print
push-buttons.
The Pennsylvania Scale Company 7X00 Series products have been designed to be
simple and easy to operate. But they also have many features that make them extremely
versatile to use such as:
ØStandard RS-232 Interface with a selectable output for
communications with a computer or printer
ØAdjustable response time
ØOptional push-buttons
ØOptional remote displays
ØSingle board electronics for ease of servicing.
ØSingle button selection of two weighing units.
In addition, the scale can be calibrated with existing keypads or through the RS-232
Interface to match the requirements of the application on hand, as it employs a digital
calibration technique that eliminates dip switches and potentiometers.

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INSTALLATION AND SET-UP INSTRUCTIONS
The 7X00 Series Scale has been packaged to ensure safe,damage-freearrival. Please
use reasonable care when removing the unit from the shipping carton, and retain the original
packaging materials in case reshipment is required.
NOTE: TO PROTECT THE WARRANTY, FILL OUT AND RETURN
THE WARRANTY CARD AND THE SCALE CONDITION
REPORT.
To prepare the 7100, 7200 and 7300 system for operation, follow the procedure
outlined below.
1. After opening the shipping carton, remove the molded foam top from the carton. (On
2 lb. and 5 lb. capacity scales the platform is packaged on top of this foam, remove it
first and lay it aside.)
2. Gently lift and remove the stainless steel platform cover only. (On 2 lb. and 5 lb.
capacity scales the platform is packaged separately and does not need to be
removed.)
3. Remove any options which may be packed with the scale.
4. Carefully remove scale from the packaging by grasping both sides of the base.
DO NOT LIFT SCALE BY THE TOP SPIDER ASSEMBLY.
5. Place the scale on a stable, level surface for operation.
6. Adjust the corner leveling feet until the level bubble indicates the unit is level. Firmly
tighten the hex jam nuts on the leveling feet. (Any time the scale is relocated, it
should be leveled.)
7. Remove the protective plastic wrap from the platform and place the platform on the
spider.
8. To activate the scale, plug the line cord into any grounded 50/60 hertz 120 volt outlet.
The version number of the software installed is displayedfirst, followedbythe scale's
diagnostic countdown process. During this countdown the display(on 7200, 7300, or
a 7100 with a remote display option) will first show the version number of the
software, followed by 9.9.9.9.9.9. through 0.0.0.0.0.0. Each number representing a
self-diagnostic test to verify the operation of important unit functions. If the scale
should fail any of these tests the display will freeze on that number. (A diagnostic
failure may be bypassed by pressing the ZERO button.) The serial interface on all
models will also transmit the test numbers. On page 4 is the table which lists each
test and its corresponding display.

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DISPLAY DIAGNOSTIC FUNCTION
9.9.9.9.9.9. EPROM Checksum, light all LEDS
8.8.8.8.8.8. RAM check
7.7.7.7.7.7. No test
6.6.6.6.6.6. Check switches not shorted
5.5.5.5.5.5. No Test
4.4.4.4.4.4. Check load cell excitation voltage
3.3.3.3.3.3. Analog verify (checks output from analog -digital)
2.2.2.2.2.2. Load CFG EEPROM, test virgin,
checksum, initialize on error
1.1.1.1.1.1. Load CAL EEPROM, test virgin,
checksum, initialize on error
0.0.0.0.0.0. No test
------------ Initializing system (may take several seconds)
After the countdown is completed, the scale performs an initial zeroing of the system.
No weight should be on the platform at this time.
NOTE: Allow at least 20 minutes for initial warm-up and load cell stabilization.
9. The system should now be ready for operation.

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OPERATION
OPERATIONAL FEATURES
The following features are available on all 7X00 Series Scales.
Overload -If the weight exceeds 105% of full capacity, the scale will read out "OLOLOL",
meaning overload.
Underload -If the weight is below-3% of full capacity, the scale will read out "ULULUL",
meaning system underload.
Automatic Zero-Tracking (AZT) -Maintains the system zero to within +/-1/4 of the
display resolution (The resolution being the smallest
increment the scale is programmed to read). AZT
increases the overall accuracy of the system by
removing errors at zero caused by accumulation of
debris on the base/container or minor drifts in the
electronics or load cell.
EXTERNAL CONNECTORS
Available on 7100, 7200 and 7300 scales and may be accessed through the opening on the
bottom of the scale.
D-Subminiature Connector (9-pin) -Used with RS-232 Interface.
Remote Display Connector -Used to connect the remote display option to the scale.
DISPLAYS AND INDICATORS ( Refer to Fig. 1 on Page 6)
Available on the Models 7200 and 7300 with or without a remote display option, or a 7100
with a remote display option.
Weight Display -Indicates weight when the meter is weighing.
Zero Indicator -Illuminates when the weight is within +/-1/4 of the display resolution of
system zero.
Weighing Unit Indicators -Two weighing unit indicators are provided to indicate the unit
of measure being displayed (lb, kg, g, oz, etc.).

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PUSH-BUTTON FUNCTIONS (Refer to Fig. 1 below.)
A standard feature on the Model 7300, buttons are also available on the 7100 and
7200 with the optional remote display with push-buttons.
ZERO ON/OFF Push-button -Sets meter to zero. It also functions as a CONTINUE
switch during the self-diagnostic check (i.e., if the meter
stops at a diagnostic check number, the switch may be
pressed to resume the countdown). If held in for five
seconds, the unit turns off. Press again to turn on.
UNITS Push-button -Use this button to select between the primary(upper UNIT indicator)
and secondary (lower UNIT indicator) weighing unit.
PRINT Push-button -Transmits formatted print to any device connected to the RS-232
port. Holding this push-button for four seconds will access the
RS-232 configuration mode.

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WEIGHING
The following instructions are for theModel 7300 with or without a remote display
option or 7100/7200 Scales with a remote display option with push-buttons. (The 7100 and
7200 scales without the remote display with push buttons require RS-232 communications to
operate. Refer to the RS-232 command section for operating these scales.)
WEIGHING WITHOUT TARE
Establish a base zero by pressing ZERO with nothing on the scale platform to clear
any existing weights.
Use the UNITS button to select either the Primary or Secondary weighing unit.
Place the item(s) to be weighed on the platform and read the weight on the display.
NOTE: If very light items (less then 1/4 of the display resolution) are placed on
the platform individually, the weight may be zeroed off by the AZT
feature. Add light items to the platform simultaneously.
WEIGHING WITH TARE
Establish the tare weight by placing the container or object to be tared-off on the
platform and press ZERO.
Place the objects to be weighed in the container and read the net weight on the
display. To clear a tare value, remove all weight from the scale, press ZERO.

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BI-DIRECTIONAL SERIAL ASCII INTERFACE
INTRODUCTION
The 7X00 Scale Series Serial ASCII Interface is an RS-232C, TTL-compatible,
asynchronous serial interface capable of bi-directional transmission of scale data.
This interface features programmable baud rates, word lengths, stop bits, parity,
address number and a formatted print.
COMMUNICATION CAPABILITIES
The interface provides three basic types of communication with the Model 7X00
Series:
1. Transmission of a predetermined (at set-up time) array of information for formatted
printing. This may be initiated by pressing the PRINT push-button on a 7300 front
panel or remote display with push buttons or by sending "SRP"<CR> ("Send
Requested Print") command to the unit. The scale is shipped from the factory set-up
to send the Gross weight when the PRINT button is pressed.
2. Transmission and alteration of specific data upon request from an external device.
3. Alteration of the unit's operating mode upon request from an external device.
4. Alteration of scale Calibration and RS-232 communications parameters and print
formatting information. (Refer to Programming and Calibration section of this
manual for more information.)