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Pennsylvania Scale Company 7500 Series Operation Manual

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Pennsylvania Scale Company
For online interactive tech support or more information on Pennsylvania
Scale products, visit our website at
Model 7500 Scales
&
7500/4 Indicator
Operation
&
Calibration
Manual
Pennsylvania Scale Company
1042 New Holland Avenue
Lancaster PA 17601
Version 4.02
Revised September 3, 2002
www.pascale.com

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Summary of Contents for Pennsylvania Scale Company 7500 Series

  • Page 1 Pennsylvania Scale Company Model 7500 Scales & 7500/4 Indicator 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 Version 4.02...

  • Page 2: Table Of Contents

    CONTENTS 7500 SERIES – OPERATIONS-SECTION 1 INTRODUCTION - INSTALLATION AND SET-UP PLATFORM CONNECTION DIAGNOSTICS OPERATING OPERATIONAL FEATURES INTERNAL CONNECTORS DISPLAYS AND INDICATORS PUSH BUTTON FUNCTIONS WEIGHING WEIGHING WITHOUT TARE WEIGHING WITH TARE COUNTING COUNTING WITHOUT SAMPLE UPDATE COUNTING WITH SAMPLE UPDATE...
  • Page 3 FORMATTED PRINT CODES COMMAND FORMATS RS-232 SCALE COMMANDS RS-232 CONFIGURATION RS-232 PRINT CODES RS-232 SERIAL INTERFACE CALIBRATION COMMANDS CALIBRATION EXAMPLE “CAL” COMMAND 7500 SERIES – ADDENDUM – SECTION 3 INTRODUCTION 7500 AC/DC Operating Instructions 7500 Basis Weight Scale 7500M Money Manager Scale...

  • Page 4: Introduction

    INTRODUCTION This manual covers the Operations and Programming/Calibration of the Pennsylvania Model 7500 series scales and indicators. The 7500 is designed to be simple and easy to operate. But has many features that make it extremely versatile to use, such as: Ø...

  • Page 5: Installation And Set-Up

    INSTALLATION and SET-UP INSTRUCTIONS (Scale Version) The 7500 Series Scale has been packaged for shipment to ensure safe, damage-free arrival. Please use reasonable care when removing the unit from the shipping carton and retain the origi- nal packaging materials in case reshipment is required.
  • Page 6 (The diagnostic failure may be bypassed by pressing the ZERO button.) The serial interface on all models will also transmit the test numbers. INSTALLATION AND SET-UP INSTRUCTIONS (7500/4 Indicator) 7500/4 Indicator has been packaged for shipment to ensure safe, damage-free arrival. Please use reasonable care when removing the unit from the shipping carton, and retain the original packaging materials in case reshipment is required.
  • Page 7 CONNECTING THE 7500/4 IN WASHDOWN APPLICATIONS: Open the 7500/4 enclosure by removing the screws holding on the back plate. Carefully remove the back plate from the indicator. The main circuit board is mounted to the back plate. On the main circuit board, locate the load cell terminal block labeled P11. A white dot on the circuit board denotes the location of pin #1 on the terminal block.

  • Page 8: Diagnostics

    DIAGNOSTICS 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 to digital) 2.2.2.2.2.2. Load CFG EEPROM, test virgin, checksum, initialize on error 1.1.1.1.1.1.

  • Page 9: Operational Features

    OPERATION OPERATIONAL FEATURES The following features are available on the 7500 series. 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.

  • Page 10: Displays And Indicators

    DISPLAYS AND INDICATORS Weight Display - Indicates weight when the scale is weighing. Indicates count when scale is in the counting mode, and displays messages during calibration and sample set operations. Zero Indicator - Illuminates when the weight is within +/-1/4 of the display resolution of system zero.

  • Page 11: Weighing

    WEIGHING WEIGHING WITHOUT TARE Ø Remove any items setting on the weighing platform Ø Press the UNITS button to select either the Primary or secondary weighing unit (Associated indicator will be lit.) Ø Establish a base zero by pressing the ZERO button with nothing on the weighing platform.

  • Page 12: Counting

    COUNTING COUNTING WITHOUT SAMPLE UPDATE Ø Remove all objects from the weighing platform and press ZERO. Ø If a container will be used to hold the parts being counted, place the empty container onto the platform at this time. Ø Press the SAMPLE SET button.
  • Page 13 COUNTING WITH SAMPLE UPDATE (cont’d.) Ø Scale will display "- - - - - -" for about 2 seconds and then display the count. Ø The count accuracy can now be improved by randomly adding quantities of parts that are greater then one but less then the original sample.

  • Page 15: Bi-Directional Serial Ascii

    BI-DIRECTIONAL SERIAL ASCII INTERFACE INTRODUCTION 7500 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 7500: The interface provides three basic types of communication with the Model...

  • Page 16: Command Formats

    TYPICAL CABLE WIRING: To connect to an IBM AT or compatible use a cable with one male and one female DB-9 connector with all nine pins connected straight through. RS-232 COMMUNICATIONS PARAMETERS The unit leaves the factory with the following default communication settings : BAUD WORD LENGTH 7 bits...

  • Page 17: Scale Commands

    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 MODEL 7500 RS-232 SCALE COMMANDS General Commands...
  • Page 18 Commands Which Request Information Send All Information Send Abbreviated Output (same as SRP) Send Configuration Information Send COunt Send DaTe (with time and date option only) Send Gross Weight Send Metrological Information Send Net Weight Send Print Codes Send Piece Weight Send Requested Print Send Sample siZe Send TiMe (with time and date option only)

  • Page 19: Sample Computer Program

    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);...
  • Page 20 NOTES: Omit line 180 if data is not to be sent to the printer. Omit lines 100 and 190 if data is not to be written to a file. In line 100, the word "OUTPUT" opens the file "test.dta", deleting any data that was in the file before this program was started.

  • Page 21: Error Message List

    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...

  • Page 22: 7500 Series - Programming/Calibration

    7500 SERIES - PROGRAMMING/CALIBRATION SECTION 2 INTRODUCTION programming and calibration This manual covers the of the Pennsylvania Scale Model 7500 series. The 7500 can be calibrated from the keypad, or through the RS-232 Interface. A digital calibration technique is employed that makes it very versatile when matching the indicator to the...
  • Page 23 7500 SERIES CALIBRATION Before attempting to calibrate the 7500, a thorough understanding of the method of data entry is required. Below is an explanation of the switches and their function. When the calibration mode is entered, the front keypad buttons will be redefined to allow data entry.
  • Page 24 DATA ENTRY EXAMPLE The following example describes the switch-closure sequence needed to enter the number 320.0. 1 While the display is alternately flashing the calibration step number and the data stored, press the INC button to start the data input sequence . The display will stop flashing and show "0".
  • Page 25 7500 SERIES CALIBRATION The calibration of the 7500 is divided into seven major categories. The entry point to each of these categories is the calibration step that is evenly divisible by ten. STEP DESCRIPTION Cal 20 Entry point (20) = Manual CAL (Input operational features)

  • Page 26: Calibration Procedure

    To begin calibration 7500 scale: The calibration switch on the 7500 Series Scale is located below an access plate on the top, front, center of the scale. The access plate is held in place by a sealing screw that passes up through the bottom of the scale.

  • Page 27: Calibration Steps

    CALIBRATION STEPS NOTE: During the calibration procedure each calibration step will be printed to any device interfaced to the RS-232 port. (Refer to page 24 for a sample print out.) STEP DESCRIPTION (Press ENTER after each entry.) (* = normal entry) CAL 20 Manual Calibration entry point CAP 21 - Full Capacity - Input full capacity of scale...
  • Page 28 CAL 30 Entry point for secondary weighing unit. 2Un 31 - Select secondary weighing unit from the following chart with the INC button: 1 = lb 5 = lb t 9 = c 13 = tons 2 = kg* 6 = g 10 = oz f 3 = g 7 = dwt...
  • Page 29 CFG 50 Entry point for sample sizes. (May be accessed from the front panel by pressing and holding the PRINT button for 2 seconds.) SS1 51 - Key in first sample size. (Normal entry is 10*) NOTE : ENTERING A "0" FOR THIS STEP WILL DISABLE THE COUNT MODE. SS2 52 - Key in sample size number two.
  • Page 30 Ech 65 - ECHO: Use the INC button to select whether the scale is to echo input data back to the sending device. no Ech (No echo)* Ech (Echo) Cdr 66 - COMM (Network) ADDRESS: If the scale is used in a networking situation it may be assigned an address number. When an address number is assigned, the scale will ignore any commands not preceded by that number.

  • Page 31: Building A Formatted Print

    Before continuing, an explanation of formatted printing is necessary. BUILDING A FORMATTED PRINT The user defined formatted print is the string of information sent from the RS-232 port when the PRINT button is pressed or the indicator receives an SRP command from a computer or terminal. The user selects the format of this string by entering two digit print codes into the 21 available print slots, PSL 81 through PSL 102.
  • Page 32 TARE 1.000 LB...

  • Page 33: Formatted Print Codes

    FORMATTED PRINT CODES Print Prefix and Suffix Formatted Print Codes 02 = Current Time (Time and Date option only) 03 = Current Date (Time and Date option only) 04 = Current weighing unit suffix label 05 = "GROSS" prefix label 06 = "TARE"...
  • Page 34 FORMATTED PRINT CODES (cont’d.) Continuous Output Print Codes 50 = Continuous output (Formatted print will be sent continuously as long as scale is turned on.) 51 = Toggled continuous output (The formatted print will be sent continuously after the PRINT button is pressed or an SRP command is received by the scale. Pressing the PRINT or sending SRP a second time will turn off the continuous output.) 52 = Status Character (May be used by a computer to determine the condition of the...
  • Page 35 FORMATTED PRINT CODES (cont’d.) Continuous Output Print Codes (cont’d.) OL/UL, count, secondary, stable n OL/UL, count, secondary, unstable p Net, count, primary, stable, non-zero weight q Net, count, primary, stable, zero weight Net, count, primary, unstable, non-zero weight Net, count, primary, unstable, zero weight Net, count, secondary, stable, non-zero weight u Net, count, secondary, stable, zero weight v Net, count, secondary, unstable, non-zero weight...

  • Page 36: Command Formats

    COMMAND FORMATS The Pennsylvania Scale Model 7500/4 Indicator may be calibrated and programmed through the RS-232 Interface using a terminal or computer. The scale is controlled by various commands, each three letters long, that represent related English phrases or words. When the scale receives command strings, they are first placed in a 125-character buffer.

  • Page 37: Rs-232 Scale Commands

    MODEL 7500/4 RS-232 SCALE COMMANDS General Commands Acquire Tare Weight Initiate self-diagnostics CHecK LoCK out keypad Power ON Power OFf RESet, clears tare weight and piece weight Select Count Mode Select Sample Size Seclect Weight Mode UnloCK keypad UNit Primary UNit Secondary ZeRO scale Commands Which Enter Information into the Unit...
  • Page 38 MODEL 7500/4 RS-232 SCALE COMMANDS (cont’d.) Calibrate and Configure Commands (* requires CAL switch to be pressed) CAL* CALibrate - Scale will follow push button cal. ConFigure Communication - To set baud rate etc. ConFigure sLeep mode ConFigure Print codes - To enter print formatting. ConFigure Time and date (Time and Date option only) CaLibration End - To save calibration data.

  • Page 39: Rs-232 Print Codes

    COMMAND FORMAT DESCRIPTION CFC 9600 8 1 0 0 5 <ENT> Selects 9600 Baud, 8 bit word length, 1 stop bit, no parity, no echo, and address #5. Other baud rates that can be used are: 300, 600, 1200, 2400, 4800 &...

  • Page 40: Rs-232 Serial Interface

    CFT 2 11 00 11 05 94 <ENT> Scale will set the clock to 12 hour, currently AM, the hour to 11:00, minutes to 0, month to Nov., day to 5, and year to 1994. NOTE: Spaces must separate the settings and there must be 6 entries, followed by a carriage return.

  • Page 41: Calibration Commands

    CR/LF "Waiting for Calibration Command" If settings are acceptable. (-232- ) "? Calibration Command Error" If illegal values for the (CALErr) settings, incorrect number of settings, spaces not used between the settings, etc. NOTE: Spaces must separate the command and settings. And each command string must be terminated with a carriage return.
  • Page 42 COMMAND: CLW 3 1 10 <ENT> Enters the Weight Calibration a filter response of 3, and using a 1 lb. and 10 lb. weight. NOTE: Unless Calibration points are entered as part of the CLW command, Calibration points will default to one half, and one, times the full scale primary weighing range. RESPONSE TO TERMINAL (parenthesis indicate local display message): "Internal A/D Calibration.- Please Wait...

  • Page 43: Calibration Example

    RESPONSE TO TERMINAL: "Saving CAL Data If data acceptable. CAL Completed" CALIBRATION EXAMPLE Using the example commands from above, a typical sequence of calibration commands might be: CLP 10.0 0.002 5.0 1 Enters the primary calibration factors CLU 0 Selects print while Unstable for non-NTEP CLW 3 Enters the weight calibration mode CLS 2 0.001...
  • Page 44 USING THE "CAL" COMMAND The "CAL" command may also be used to calibrate the scale. This command will cause the scale to enter the same calibration routine as the push button calibration process. After the "CAL" command is sent to the scale it will prompt the operator to press the calibration select button on the main PCB (SW4).
  • Page 45 USING THE "CAL" COMMAND (cont’d.) Configuration Step (50)? 50* 51 Sample size #1 (10)? 10 {#1 Sample set number} 52 Sample size #2 (20)? 20 {#2 Sample set number} 53 Sample size #3 (50)? 50 {#3 Sample set number} 54 Sample size #4 (100)? 100 {#4 Sample set number} Configuration Step (60)? 60* 61 Baud Rate ( 300)? 0...

  • Page 46: 7500 Series - Addendum - Section

    7500 Series – Addendum Section 3 Special Programs INTRODUCTION The 7500 may be ordered with a number of different software program options for special application use. This addendum to the manual provides instructions on operational differences between these scales and the standard scale. The addendum instructions cover only the...
  • Page 47 7XOO Series AD/DC Scales NOTE: These instructions cover only the operational differences between the AC/DC and the AC only scale. They are meant to be used in conjunction with the standard operator's manual. UNPACKING AND SET-UP: This scale has been shipped with the battery installed and ready for operation. Although the battery was fully charged when the scale was packed, it is recommended that the scale be plugged in and the battery charged for a full 12 hours before using on DC for the first time.
  • Page 48 To operate the scale on DC: 1. Disconnect the AC power supply/line cord from both the AC outlet and the scale. Press the ON/OFF switch on the back of the scale to "ON" and hold it until the display lights up, then release the switch.

  • Page 49: 7500 Basis Weight Scale

    7500-5BW – Basis Weight scale This Pennsylvania Scale Model 7500 has special software installed that provides for three basis weights. When the scale is turned on, it displays the actual weight on the platform. Press the UNITS switch once to display the first basis weight (multiplied by 480). The “x480” LED indicator will light.

  • Page 50: 7500M Money Manager Scale

    7500M Money Manager Scale The Pennsylvania Scale Model 7500 M is a 7500 scale with all of the counting functions removed, and replaced with money management software for 4 user defined coin values. To enter the Coin Weighing mode, press the UNITS button twice. The units will switch from Primary Units, to Secondary Units, Coin Value.
  • Page 51 The display will alternate between “VAL 51” the current coin value. The appropriate LED will also be lit. Key in the value of the coin if different, and press the PRINT button to continue. The display will alternate between “SS 52” and the current sample size. Key in the number of coins in the sample.
  • Page 52 the scale is in the Coin mode. 22 – Send Net Weight – Modified to send the Net value of the coins on the platform, if the scale is in the Coin node. 30 – Send Gross Weight with prefix and suffix – Modified to send the Gross value of the coins on the platform, if the scale is in the Coin mode and a prefix indicating the current Coin.

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