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

2
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

3
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

4
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.

5
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.

6
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.

7
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.).

8
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.

9
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.

10
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.)

11
RS-232 PIN ASSIGNMENTS and IMPLEMENTED FUNCTIONS
Connection to the Serial Port is made via a DB-9 female connector found in the
access area on the bottom of the scale.
PIN EIA CODE FUNCTION DIRECTION
2 BB Transmit Data Output
3 BA Receive Data Input
5 AB Signal Ground -
6 CC Data-Set Ready (DSR) Output
7 CB Clear to Send (CTS) Input
8 CA Request to Send (RTS) Output
NOTE: All remaining pins are currently unused and unconnected. For simple
terminal usage where the data rate does not exceed either machine's
capacity to process it, only pins 2, 3, and 5 need to be connected.
TYPICAL CABLE WIRING
To connect to a IBM AT or compatible use a cable with one male and one female
DB-9 connector with all nine pins connected straight through.
The unit leaves the factory with the following default communication settings :
BAUD 300
WORD LENGTH 7 bits
STOP BITS 1
PARITY ODD
These settings may be changed using the local or remote display keyboard, or RS-232
Interface commands. If the RS-232 Interface is used, initial communication with the users
computer or terminal must be established using the above settings. To return the RS-232
settings to the above default values:
1. Unplug the unit power cord or otherwise remove power.
2. Depress the internal Calibrate button.
3. Plug in (or energize) the unit and continue to hold the
calibrate button for 5 seconds.
For information on how to reconfigure the RS-232 parameters, refer to the
Calibration and Programming section of this manual.

12
COMMAND FORMATS
The Model 7X00 Series can be controlled from an external device (such as a
computer or terminal) by various commands, each three letters long, which represent related
English phrases or words. For example, to tell the scale to zero, type ZRO followed by a
carriage return.
When the scale receives command strings, they are first placed in a 125-character
buffer. If many commands are sent to the scale at high baud rates, it is possible to
completely fill this buffer and data will be lost. Be sure to send commands to the scale at a
rate which does not exceed 125 characters every 500 ms.
The basic command formats are:
1. [<add>]<cmd><cr>
2. <cmd> [<flt>]<cr>
Where <cmd> is a three letter command, <add> is a scale address number (0-255),
<cr> represents a carriage return, and <flt> is a mixed number, the brackets [ ] are used to
indicate an optional part of the command.
The following are some examples of command formats:
Command format 1:
SRP<cr> Send a formatted print
Command format 2:
ITW 13.43<cr> Instructs scale to set tare weight
to 13.43 in the current unit
Command format 3:
5 SGW<cr> Instructs the scale with address #5 to
send the gross weight.

13
MODEL 7X00 SERIES RS-232 SCALE COMMANDS
General Commands
ATW Acquire Tare Weight
CHK Initiate self-diagnostics CHecK
LCK LoCK out keypad
PON Power ON
POF Power OFf
RES RESet, clears tare weight
UCK UnloCK keypad
UNP UNits Primary
UNS UNits Secondary
ZRO ZeRO scale -
Commands Which Enter Information into the Unit
ITW [ FLOATING POINT NUMBER ] Input Tare Weight
Commands Which Request Information
SAI Send All Information
SAO Send Abbreviated Output (same as SRP)
SCI Send Configuration Information
SDT Send DaTe (with time and date option only)
SGW Send Gross Weight
SMI Send Metrological Information
SNW Send Net Weight
SPC Send Print Codes
SRP Send Requested Print
STM Send TiMe (with time and date option only)
STW Send Tare Weight
SVN Send Software Version Number

14
Calibrate and Configure Commands
CAL CALibrate -Same as pressing SW4 button.
CFC ConFigure Communication -To set baud rate etc.
CFP ConFigure Print codes -To enter print codes.
CLE CaLibration End -To save calibration data.
CLP CaLibrate Primary -To set-up primary calibra-
tion data.
CLU CaLibration Unstable -To set-up print
stable/unstable.
CLW CaLibration Weight -To calibrate with weights.
NOTES: All commands and parameters must be separated by spaces. The entire
command string must be terminated with a carriage return.
All calibrate and configure commands are further explained in the
Calibration and Programming section of this manual.
All tare functions are available only through the RS 232 interface.
The
display on the scale will only show the gross weight.

15
SAMPLE COMPUTER PROGRAM
The 7600 series RS-232 Interface may be tested by connectingitto aterminal withan
RS-232 port, or a computer with an RS-232 and a terminal program. If a terminal program is
not available the following program is provided for an IBM PC or compatible using
BASICA, MBASIC or QuickBASIC.
10 ' Terminal Program written for BASIC Programming Language
20 ' Provided by Pennsylvania Scale Company
30 '
40 DEFINT A-Z
50 FALSE = 0: TRUE = NOT (FALSE)
60 KEY OFF: CLS : LOCATE 25, 1
70 PRINT SPACE$(20); "Press Alt-X to Exit Terminal Program"
80 LOCATE 1, 1
90 OPEN "Com1:300,o,7,1" FOR RANDOM AS #1 'Handshaking Enabled
100 OPEN "test.dta" FOR OUTPUT AS #2
110 WHILE NOT (QUIT)
120 KEYBOARDINPUT$ = INKEY$
130 IF KEYBOARDINPUT$ = CHR$(0) + CHR$(45) THEN QUIT = TRUE
140 IF KEYBOARDINPUT$ <> " " THEN PRINT #1, KEYBOARDINPUT$;
150 IF LOC(1) > 0 THEN
160 SCALEINPUT$ = INPUT$ (LOC(1), #1)
170 PRINT SCALEINPUT$;'Writes data from scale to screen
180 LPRINT SCALEINPUT$; 'Writes data from scale to printer
190 PRINT #2, SCALEINPUT$; 'Writes data from scale to file
200 END IF
210 WEND
220 END
NOTES:
ØOmit line 180 if data is not to be sent to the printer.
ØOmit lines 100 and 190 if data is not to be written to a file.
ØIn line 100, the word "OUTPUT" opens the file "test.dta", deleting any data
that was in the file before this program was started. If you want to preserve the
contents on the file "test.dta" from one session to another, replace the word
OUTPUT with APPEND on line 100.
SAMPLE COMPUTER PROGRAM (cont’d.)

16
NOTES:
ØLine 90 opens the serial communications port, using 300 baud, Odd parity, 7
data bits, and 1 stop bit. These represent the default settings for the scale, other
entries may be used if the scale settings have been changed. Valid entries for
baud rate are 300, 600, 2400, 4800, 9600, or 19200. Valid entries for parity are N
(none), E (even), or O (odd). Valid entries for data bits are 7 or 8. Valid entries
for stop bits are 1 or 2. Com2 may be used if the scale is attached to serial
communications port #2.
ØTo eliminate the need for attaching the handshaking lines in the cable between
the scale and the computer, change line 90 to read:
90 OPEN "Com1:300,o,7,1,RS,DS0" FOR RANDOM AS #1
'Handshaking Disabled

17
ERROR MESSAGE LIST
During Diagnostics:
Err1.CA Scale Calibration
Err2.00 to Err2.63 EEPROM Write Failure
Err2.rS Serial Interface Setup
Err3.Hd Deadload too High
Err3.nS No Sense Line Connected
Err3.-d Negative Deadload
Err4.Sh Load Cell Excitation Shorted
Err6.-1 to Err6.-4 Switch SW1-SW4 Shorted
Err8.00 to Err8.FF RAM Test Error
Err9.CS Eprom Checksum Error
All Other Times:
Message on Display Explanation Message From ASCII Port
Err2.00 to Err2.FF EEPROM read error "Err2.? EEPROM"
Err 10 Count too large none
Err 11 Keyboard Entry Error none
Err 13 Negative number less none
than -99,999 will not
fit on the display.
Err 30 Illegal Zero none
Err 31 Illegal Tare none
Err 40 Load Cell error none
Err 80 RS -232 Input Error none
Err 81 RS -232 Input Error none
Err 82 RS -232 Overflow none
Err Cnf Config load error on startup "Err 85 Reset to 300 baud"
Err xx* Undefined (Consult Factory) none
ULULUL Load Cell Underload "Err 41"
OLOLOL Load Cell Overload "Err 42"
CalErr RS -232 Cal Error "Calibration Command
Error"
none Bad Print Code "Err 83 Print Code"
none No End Code "Err 84 No Code 99"

18
* Where "xx" equals any number or character not shown on the above list.
71/72/7300 SERIES SCALES PROGRAMMING/CALIBRATION
SECTION 2
INTRODUCTION
This manual covers the Programming and Calibration of thePennsylvania
Scales Model 7100, 7200 and 7300.
The 7100, 7200 and 7300 series scales can be calibrated using the standard or
optional function buttons, or through the RS-232 Interface. The scale employs a digital
calibration technique that makes it very versatile when matching the Scale to the require-
ments of the application at hand.
This manual covers calibration and programming of the following Pennsylvania products:
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.
All of these products come standard with a RS-232 Interface and the capability of
accepting a remote display with or without push-buttons.

19
7X00 SERIES CALIBRATION
The following calibration data entry applies to the Model 7300 or a 7200 and 7100
with a remote display with push-buttons interfaced. For calibration of models without
push-buttons, please refer to the RS-232 Interface command section.
Before attempting to calibrate the scale, a thorough understanding of the method of
data entry is required. Below is an explanation of the switches and their functions.
When the calibration mode is entered, the pushbutton switches will be redefined to
allow data entry. The four switches will be redefined as shown by the parentheses.
CAL (D.P. / CLR)
[The CAL switch is located inside of the scale on the main PCB, directly below
the access cover plate.]
ZERO (INC.) UNITS (ADV.) PRINT (ENT.)
ON/OFF
Following is a description of the function of each switch.
INC (Increment)
This switch is used to key numbers onto the display. The value of the number
increases by one each time the switch is pressed. Holding the switch closed will engage
automatic incrementing.
NOTE: This switch will also act as a scroll push-button, used to make calibration
selections where noted in the instructions. For all other calibration steps
it acts as the increment push-button.

20
FUNCTION BUTTONS (cont’d.)
ADV (Advance)
The advance switch multiplies any number keyedintothe scaleby 10,(The number is
shifted one digit to the left each time the button is pressed). If this switch is pressed when the
display shows "0", the digit will not shift. If it is pressed when the display is filled, the
display will be cleared and the input procedure can be restarted.
D.P. / CLR (Decimal Point / Clear)
Pressing this push-button once causes the decimal point to appear.Ifan erroris made
at any time during data entry pressing this push-button twice will clear the display. The
correct data can then be entered.
ENT (Enter)
When this push-button is pressed the data currently displayed is committed to system
memory and the calibration automatically advances to the next calibration step.