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Pennsylvania 7400 Operation Manual

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Pennsylvania Scale Company
Model 7400 Digital Indicator
Operation 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
Revised September 3, 2002
1

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  • Page 1 Pennsylvania Scale Company Model 7400 Digital Indicator Operation 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 Revised September 3, 2002...

  • Page 2: Table Of Contents

    7400 SERIES INDICATOR - OPERATIONS - SECTION 1 CONTENTS INTRODUCTION - 7400 Indicator INSTALLATION and SET-UP CONNECT A PLATFORM ATTACHING NON-PENNSYLVANIA PLATFORMS 4 - 5 DIAGNOSTIC FUNCTIONS 4 - 5 OPERATIONS FEATURES EXTERNAL CONNECTORS DISPLAYS AND INDICATORS PUSH-BUTTON FUNCTIONS WEIGHING...

  • Page 4: Introduction - 7400 Indicator

    Programming/Calibration Pennsylvania Scale Model 7400 Indicators. of the The 7400 Series Indicator is designed to be simple and easy to operate. It has many features that makes it extremely versatile to use such as: Ø Standard RS-232 Interface with a selectable output for communications with a computer or printer Ø...

  • Page 5: Installation And Set-Up

    WARRANTY CARD AND THE SCALE CONDITION REPORT. The 7400 is designed to be used with a separate load cell based weight platform. This platform may have a 1, 2, or 3 mv/v sensitivity and a bridge resistance of 87 to 2000 ohms.

  • Page 6: Attaching Non-Pennsylvania Platforms

    After attaching your 7400 to a platform, it may be activated by plugging the line cord into any grounded 50/60 hertz 120 volt outlet (220 volt if the option was ordered). The 7400 will begin a diagnostic countdown. During this countdown the display (on 7400M, 7400MS, 7400SS or a 7400 Smart Box with a remote display option) will first show the version number of the software, followed by 9.9.9.9.9.9.
  • Page 7 DIAGNOSTICS (cont’d.) DISPLAY DIAGNOSTIC FUNCTION 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) - - - - - - A to D converter calibration 2.2.2.2.2.2. Load CFG EEPROM, test virgin, checksum, initialize on error 1.1.1.1.1.1.

  • Page 8: Features

    Remote Display Connector - Used to connect the remote display option to the scale. DISPLAYS AND INDICATORS (Available on the 7400M, 7400MS and 7400SS with or without a remote display option or the 7400 Smart Box with a remote display option.) Weight Display - Indicates weight when the meter is weighing.

  • Page 9: Push-Button Functions

    OPERATIONAL FUNCTIONS (cont’d.) PUSH-BUTTON FUNCTIONS Available on the 7400M, 7400MS, 7400SS standard and on the 7400 Smart Box with a remote display with buttons option. 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).

  • Page 10: Weighing

    The following instructions are for the 7400M, 7400MS and 7400SS with or without a remote display option or a 7400 Smart Box with a remote display option WITH push-buttons. (The 7400 Smart Box without a remote display with push buttons requires RS- 232 communications to operate.

  • Page 11: Bi-Directional Serial Ascii Interface

    COMMUNICATION CAPABILITIES The interface provides three basic types of communication with the Model 7400: 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 the front panel or remote display with push buttons or by sending "SRP"<CR>...

  • Page 12: Rs-232 Assignments

    RS-232 PIN ASSIGNMENTS AND IMPLEMENTED FUNCTIONS Connection to the Serial Port is made via a DB-9 female connector found on the bottom of the indicator. EIA CODE FUNCTION DIRECTION Transmit Data Output Receive Data Input Signal Ground Data-Set Ready (DSR) Output Clear to Send (CTS) Input...

  • Page 13: Command Formats

    COMMAND FORMATS The Model 7400 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.

  • Page 14: Rs-232 Scale Commands

    MODEL 7400 RS-232 SCALE COMMANDS General Commands Acquire Tare Weight Initiate self-diagnostics CHecK LoCK out keypad Power ON Power OFf RESet, clears tare weight UnloCK keypad ZeRO scale Commands Which Enter Information into the Unit ITW [ FLOATING POINT NUMBER ]...
  • Page 15 MODEL 7400 RS-232 SCALE COMMANDS (cont’d.) 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 2 of this manual.

  • Page 16: 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...
  • Page 17 SAMPLE COMPUTER PROGRAM (cont’d.) 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 18: 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 Err7.nr Defective NOV RAM Err8.00 to Err8.FF...
  • Page 20 Pennsylvania Scale Company Model 7400 Digital Indicator 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 Revised September 3, 2002...
  • Page 21 SECTION 2 INTRODUCTION The 7400 can be calibrated using the standard or optional function buttons or through the RS-232 Interface. It employs a digital calibration technique that makes it very versatile when being matched to the requirements of the application at hand.
  • Page 22 The four switches will be redefined as shown by the parentheses. CAL (D.P. / CLR) [The CAL switch is located inside of the 7400 on the main PCB, on the top edge of the board and on the approximate center side to side.] ZERO (INC.)
  • Page 23 FUNCTIONS (cont’d.) ADV (Advance) The advance switch multiplies any number keyed into the scale by 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 may be restarted.
  • Page 24 DATA ENTRY EXAMPLE The following example describes the switch-closure sequence needed to enter the number 320.0. 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 CALIBRATION PROCEDURE The calibration of the 7400 is divided into five major categories. The entry point to each of these categories are the calibration steps that are evenly divisible by ten. STEP DESCRIPTION Cal 20 Entry point (20) = Manual CAL (Input operational features) (40) = Load Cell (Calibrates the scale weights) This mode requires the use of approved weights to be completed.
  • Page 26 CALIBRATION (cont’d.) To begin calibration: CAUTION: Since this must be done with the indicator turned on, care MUST be taken not to come in contact with the 110 volt power supply section on the far left side of the circuit board. Ø...
  • Page 27 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 20 for a sample print out.) STEP DESCRIPTION (Press ENTER after each entry) CAL 20 Manual Calibration entry point CAP 21 Full Capacity - Input full capacity of scale rES 22...
  • Page 28 CALIBRATION STEPS (cont’d.) CAL 40 Load Cell Calibration entry point FIL 41 Response time - Enter a number from 0 to 9 to select the response time of the scale. Pressing the INC button will scroll through the numbers. Press ENTER when the desired number is reached.
  • Page 29 CALIBRATION STEPS (cont’d.) CFG 60 RS-232 Configuration (This step can also be reached from the front panel by pressing and holding the PRINT button for 2 seconds.) Press ENTER. (* = default) bAU 61 BAUD RATE: Select a baud rate from the table below using the SCROLL (INC) push-button to view the options;...
  • Page 30 The time is entered in number of minutes, from .5 to 25. Entering a zero will disable the sleep mode for AC only scales. (AC/DC versions of the 7400 are not available at this time.)
  • Page 31 CALIBRATION STEPS (cont’d.) CAL 80 Formatted print slot programming. Press ENT to access the first print slot. 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 scale receives an SRP command from a computer or terminal.
  • Page 32 EXAMPLE OF BUILDING A FORMATTED PRINT To build a simple formatted print that could be sent to a ticket printer the following print codes could be entered: PSL 81 - 65 (This is a carriage return and line feed.) PSL 82 - 30 (Prints the gross weight with prefix and suffix.) PSL 83 - 65 (Sends another carriage return and line feed.) PSL 84 - 32 (Prints the net weight with prefix and suffix.) PSL 85 - 65 (Sends a carriage return and line feed.)
  • Page 33 See Page 14 for a list and definition of the characters sent.) 53 = ABO Checksum (May be used in building a continuous output compatible with other Pennsylvania Scales.) 54 = Select Leading Zeros 59 = No Operation FORMATTED PRINT CODES (cont’d.)
  • Page 34 Print Special ASCII Characters Formatted Print Codes 60 = Print an ASCII space (SP) 61 = Print an ASCII horizontal tab (HT) 62 = Print an ASCII line-feed (LF) 63 = Print an ASCII start of header (SOH) 64 = Print an ASCII carriage return (CR) 65 = Print an ASCII carriage return and line feed (CR LF) 66 = Print an ASCII form-feed (FF) 67 = Turn on large print (PA Scale printer)(SO, HEX 0EH)
  • Page 35 English phrases or words. When the 7400 receives a command string, it is 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.
  • Page 36 MODEL 7400 SERIES RS-232 SCALE COMMANDS General Commands Acquire Tare Weight Initiate self-diagnostics CHecK LoCK out keypad Power ON Power OFf RESet, clears tare weight UnloCK keypad ZeRO scale Commands Which Enter Information into the Unit ITW [ FLOATING POINT NUMBER ]...
  • Page 37 CONFIGURATION OF RS-232 COMMUNICATION PARAMETERS The unit leaves the factory with the following default communication settings : BAUD WORD LENGTH 7 bits STOP BITS PARITY These settings may be changed using the local or remote display keyboard as described above, 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 set- tings.
  • Page 38 CONFIGURATION OF RS-232 PRINT CODES These print code settings may be changed using either the local or remote display push-buttons, or through RS-232 Interface commands. When communication with the unit has been established, the CFP (ConFigure Print code) command may be used as follows: COMMAND FORMAT DESCRIPTION...
  • Page 39 "Push CALIBRATION SELECT Switch" Push the Calibrate Button now. (CALSEL) This only has to be done once. After this, other commands can be entered. "W? Calibration Command Error" If illegal values for the (CALErr) settings, incorrect number of settings, spaces not used between the settings, etc.
  • Page 40 NOTE: Spaces must separate the command and settings. And each command string must be terminated with a carriage return. CLP - CaLibration Primary COMMAND: CLP 10.0 0.002 5.0 1 Enters the Calibration Factors for the Primary weighing mode. The example shown selects: 10.0 = Full scale Capacity 0.002 = Resolution 5.0 = Zero Range...
  • Page 41 RESPONSE TO TERMINAL (parenthesis indicate local display message): "Internal A/D Calibration.- Please Wait" (------) Place the following weights on the platform, press ENTER (either on terminal or scale) after each: 0.000 lb* (LoAd 0.000) 5.000 lb* (LoAd 5.000) (* = Current weighing unit selected will be displayed.) 10.000 lb* (LoAd 10.000) 0.000 lb* (LoAd 0.000)
  • Page 42 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 Ends the calibration process, stores results See the individual command descriptions for complete command and response information.
  • Page 43 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 key (SW4).
  • Page 44 USING THE “CAL” COMMAND (cont’d.) Configuration Step (80)? 80* 81 Print Slot (65)? 65 {Print codes on p. 10} 82 Print Slot (30)? 30 {Print codes on p. 10} 83 Print Slot (65)? 65 {Print codes on p. 10} 84 Print Slot (99)? 99 {Print codes on p.

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