Model PC-400 Portion Control Scale Operator`s Manual
Contents
1. ccccecccescesceesecsseccecseecseescecaeecaeeeseceneseeeeessecneecesecnaeceaecaaecaaecaeecaeseaeenseenneeneeeas 6 Chana Parameter EEE foarte e dol 6 Chaneging Startup Uns ltd idol 6 Legal Tor Trade Restrict ons EE E E soe castes dadhs Sooee dds lob etbbeossttelotben tet gos 6 Section 6 Setup Menus Explained cccccceseeeeeeeeeeeeeeeeeeeeeseneeeeeeeeees 7 Resoluton divisions Setup Menu ccccccccecssssseessceesceecesecesecseecseeeseeeseeeeeeeeseessecesecesecaeeaecsaecsecaecaaecaecaeecaeeeseesas 7 Capacity Setup Mi a daa die 7 Calibration Men A da iia 7 Auto O Mode siii italia 8 Auto Zero Track iii a ii dida incline 8 Motion A pt ii e added 8 Start UP Zeros ni A E A e dani 8 Dat Optio a Ai Saba aint 9 Data FOrmate tia A A A A A A is me 9 Baud Rates deta n 9 Convert Selecta a A A ii 9 Startup Units PERRO OPEN O Ro O 10 Operation Mode a o ode cae 10 Raw Counts aaa A sl ae Ei 10 Section 7 Data COMMUNICATIONS oooonnnnnnnnnccccnnnnnnnnnnnnnnnnnnnncnnnnnnnnnnnnninnas 11 Introduction to data COMMUNICATIONS ss o aeie n ar E R E E E E E A a 11 Printer Mod s ienai ineeie aE E ER EE E oE a E dia d 12 Data Output Formativi eai pit air Ee EROTA ERE ONE AEN E IAE E N EE 13 Bi directional Communications 2 ida A WA E OO ad 16 RS232 PiN CU iaa a Abie viet autho As 16 Section 8 Specification 17 Section 9 TroubleshootinQ oocccccconnncnccnccononannnoncccnnnnnconnnnanannnernnnnnannnes 18 Section 1 Unpacking and Inst2. FO Print String Definition for Each Weight Unit Pounds STX POL WEIGHT SP Ib SP ST CR LF Ounces STX POL WEIGHT SP oz SP ST CR LF Kiligrams STX POL WEIGHT SP kg SP ST CR LF Grams STX POL WEIGHT SP g SP SP ST CR LF Pounds ounces STX POL WEIGHTLB SP Ib POL WEIGHTOZ SP oz SP ST CR LF STX ASCII 02 POL minus sign for negative weight or a space for a positive weight WEIGHT 6 character field plus decimal if needed WEIGHTLB pound portion of lb oz weight WEIGHTOZ ounce portion of lb oz weight WEIGHTLB and WEIGHTOZ total 5 characters plus decimal SP ASCII space ST MOT if in motion or a space if stable CR Carriage return LF Linefeed Separator not printed F1 Format The F1 format is similar to FO with the following exceptions The space following the units is removed The units are in capitol letters MOT is replaced with M It is not legal for trade Dual print format 2P The dual print mode provides the PC 400 with the ability to print the current scale reading followed by the equivalent value in grams Displayed weight data with units See fig 1 for structure Carriage return amp line feed STX 2 452 lb CR LF ASCII characters 13 amp 10 STX __1112 q CR LF A gram weight data in parentheses Fig 3 Format 2P form F1 Print String
3. Setup Menu Select Scale Capacity Ibs 2 5 of scale displayed divisions is 2500 default for 5lb and 10lb scales 4 of scale displayed divisions is 5000 default for 2lb scales Capacity Setup Menu Scalecapacitysetto2 2pounds 3 Scale capacity setto 5 pounds tt Scale capacity setto 10 pounds te Scale capacity set to 13 2 pounds it Scale capacity set to 20 pounds Calibration Menu s rte Zero Calibration Point Press ZERO to calibrate zero point Apply full capacity to the scale except for the 2 2lb scale which uses 2lbs and the 13 2 Ib scale which uses 12lbs NOTE This parameter is only visible after a zero Calibration is performed Reset All Parameters to Default Settings r k Default parameters No Parameters are not defaulted Yes Set all parameters to their default values when UNITS is pressed Auto Off Mode Auto Off Mode The amount of time before the scale will shut off if not in use Stays on if lugged in Off Scale will run continually 60 minutes 30 minutes 20 minutes 10 minutes 5 minutes 4 minutes 3 minutes 2 minutes 1 minute O O o Auto Zero Tracking m of displayed divisions that are automatically zeroed from displayed zero while the scale is stable 1 2 division 3 divisions 1 division DO Dada r Daa a Motion Aperture of displayed divisions that must ge before motion is detected
4. Definition for Each Weight Unit Pounds STX POL WEIGHT SP LB ST CR LF Ounces STX POL WEIGHT SP OZ ST CR LF Kiligrams STX POL WEIGHT SP KG ST CR LF Grams STX POL WEIGHT SP G SP ST CR LF Pounds ounces STX POL WEIGHTLB SP LB POL WEIGHTOZ SP OZ SP ST CR LF STX ASCH 02 POL minus sign for negative weight or a space for a positive weight WEIGHT 6 character field plus decimal if needed WEIGHTLB pound portion of lb oz weight WEIGHTOZ ounce portion of lb oz weight WEIGHTLB and WEIGHTOZ total 5 characters plus decimal SP ASCII space ST M ifin motion or a space if stable CR Carriage return LF Linefeed Separator not printed The weight is first printed using the FO format Then the weight is recalculated in kilograms and is sent as a second line of text The kilogram data follows the FO data format except where parentheses are placed after the STX character and before the carriage return amp line feed Refer to Fig 3 SP Format The SP format is used with the Doran SSP label printer See Fig 4 for details ad Printer formatting strings FR L1 F 9 Current weight data with polarity l 0 060 Pa Current weight units Ib Gross weight status always prints Motion status when in motion 4 spaces if stable G mof Kilogram weight data with polarity 0 000 Kilogram units
5. and replace it with a new battery Please note that the battery connector is keyed and insertion should not require a lot of force If the connector will not go in place check to make sure the connector has the correct orientation Replace the battery compartment cover and the phillips head screw Voltage Levels To view the voltage of the battery perform the following steps Turn on the scale and wait for a stable weight to be displayed Press and hold UNITS Press and release ON OFF Release UNITS The battery voltage is now displayed Battery Voltages Battery Scale condition Voltage Level Fully Charged 8 4V Low Battery 6 3V Shut Off 6 0V Section 5 Parameter Setup The PC 400 has adjustable setup parameters which control the scale s operation Entering and Exiting Setup Mode Quick Setup The model PC 400 is equipped with a quick front panel setup mode This setup mode allows the non meteorological parameters to be modified To enter the front panel setup mode perform the following steps 1 Turn off the scale 2 Press and hold the UNITS button 3 Press and hold the ON OFF button for approximately one second 4 Release both buttons The scale will now be in the quick setup mode Full Setup To enter the complete setup menu perform the following steps Apply power to the PC 400 Remove the platter Turn the scale over and remove the calibration bolt Place a thin blunt object throu
6. e the ability of the receiving equipment to digest the data sent The transmission rate determines how fast the data is sent from the scale and is measured in Baud or bits per second For applications such as the PC 400 Baud and bits per second are interchangeable The transmission rate controls how many bits can be sent in a given time It is important that the sending and receiving units are set to the same Baud settings Typical values are 1200 2400 4800 and 9600 baud The term Asynchronous Serial Data Communications implies that the sending unit has no way of telling the receiving unit when a data bit has been sent or when to expect the next bit To correct this problem both the sending and receiving units use the baud rate setting to determine how fast data should be sent If the baud rates at the sending and receiving units differ the receiving unit will expect data to arrive at a different time than when the transmitting unit sent it When this happens data will be lost When the baud rates match the receiving unit has no problem with the data arriving early or late The only problem is knowing when the data transmission started The PC 400 and the equipment connected to it resolve this dilemma by sending a start bit at the beginning of each data byte This bit tells the printer or computer that a new data byte is on the way When the start bit is received the bit timer starts running and runs until it has received the cor
7. for damages to equipment or for personal injury caused by misuse overload accidental damage alteration improper installation or unauthorized opening of the equipment Under no circumstances will Doran Scales Inc be responsible for any indirect or consequential damages due to errors in weighing or failure of a Doran Scales Inc product to perform properly THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED THIS WARRANTY CONSTITUTES DORAN S EXCLUSIVE WARRANTY THERE ARE NO OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE Doran Scales Inc 1315 Paramount Pkwy Batavia IL 60510 1 800 262 6844 www doranscales com 21
8. 0 64 500 92 500 14 500 35 250 110 000 143 000 10 lb 6000 24 000 120 500 153 000 Section 4 Battery Charging The Model PC 400 can be operated by the Internal Rechargeable Battery The typical battery life is 15 hours of continuous use The scale will display LOW BATT in the LCD display panel when the battery needs to be recharged To recharge the battery follow these steps T 2 3 Insert the power connector into the rear of the scale Plug the power cord into an AC outlet 115 VAC If the scale is turned off four moving dots will appear on the bottom of the display As the battery charges the dots beginning on the left will remain on When the scale is fully charged all four dots will remain on It takes approximately four hours to completely recharge the battery The PC 400 can be used while it is being recharged The scale is ready to use powered by the fully recharged battery Replacement The Model PC 400 is powered by an internal rechargeable battery If the battery loses its ability to maintain a charge it will need to be replaced Replace the battery following these steps 1 Za 3 6 Remove any items from the scale platter and unplug the power cord from the rear of the scale Remove the scale platter and set it aside Turn the scale over and remove the phillips head screw on the battery compartment cover Remove the cover and disconnect the old battery from the battery connector
9. 1 division 2 divisions 3 divisions Controls the start up zero point na Scale will NOT zero on power up Calibrated zero is loaded on power up ir Scale will zero on power up NOTE The Legal for Trade mode disables certain options and selections listed above These items have been indicated by an asterisk Data Output oo Controls when information is transmitted from the scale though the serial port A ee data each time the display is updated H i Prints every stable weight The same as A 1 except the weight must return to zero before the next weight is printed 1 td Transmits data when the W command is received through the serial port Data Format r Format of transmitted data from the 1 serial port Basic dual print format Includes metric weight Enhanced data format Output NOT Legal for Trade Basic format for an Eltron SSP printer Call Doran for details Baud Rate Serial port transmission rate ii 1200 Baud bits per second ed 2400Baud bits per second y 4800Baud bits per second Convert Select Controls which units are available for if use All units are available lb oz kg g are available lb oz are available oz g are available ee ae th Ib kg are available E A Unit of measure that the scale displays upon power up __ The scale will power up in ounces The scale will power up in kilograms The scale
10. Model PC 400 Portion Control Scale Operator s Manual Doran Scales Inc 1315 Paramount Pkwy Batavia IL 60510 1 800 262 6844 www doranscales com Man 233 Manual Revision 0 1 Table of Contents Section 1 Unpacking and Installation ccoooonnnnnccnnccononancnnnnanannnennnos 1 Unpacime e dos lancer ce len con ao ots ote sate bite dos A aR o el acon ahead e ld Son oe ohn cone 1 Installation a Se acest o Toners a an ot ee eases o Meee dd 1 Electrical Connector de e dedo Uan Ml E o dd 1 Care amp Cleaning A re eto de Mo et e AE aces Po o o e e e clan 1 Section 2 Scale Operations Guide ooccccconnncncccnccononnnnnnncnnnnnncnnnnnanannnennnes 2 Display Ence a 2 Basic A te ea zte 2 A O RN ts 2 BV A A ad ai ais 2 POE A E A A A caan Bae aes 2 Section 3 Setup and Calibration Guide occconnccccnncccccccconoconcnncnnnannnnnnnnos 3 Power COME abi 3 RS 232 EMM A ti 3 Calibration and Parameter Setup osion ne a E ee ee 3 A Setups ensa ee Ayes E EE AEO E O E R E O N E E R Meee E E 4 Section 4 Date A Bacenetes 5 CA ee ee 5 Replacement torii cia Buck Foes tact tees ages Bae vent natant aa net Meee Secon Been eed Gn Cetera Be 5 Voltage Level a a aa Rein cd eto e dio el beds de cel om eke ata 5 Battery Voltages eet td hee Ne Sle cha no ess rennet ee Reece iat ett en GH Sle Beat eee uate 5 Section 5 Parameter Setup ccccccecessseeeeeeeeeeesneeeeeeeeeeeeeeeessnaeeeeeeesees 6 Entering and Exiting Setup Mode
11. Printer formatting string Pat NOTE Each line is terminated with a line feed ASCII 10 Fig 4 Sample SP Format SP Print String Definition for Each Weight Unit Pounds FR L1 LF LF POL WEIGHT LF Ib LF GS LF ST LF POL WEIGHT2 LF kg LF P1 1 LF Ounces FR L1 LF LF POL WEIGHT LF oz LF GS LF ST LF POL WEIGHT2 LF kg LF P1 1 LF SP kilograms FR L1 LF POL WEIGHT LF kg LF GS LF ST LF POL WEIGHT2 LF kg LF P1 1 LF K E Prj FR L1 LF LF POL WEIGHT LF g SP LF GS LF ST LF POL WEIGHT2 LF kg LF P1 1 LF Pounds ounces FR L1 LF LF POL WEIGHTLB SP Ib POL WEIGHTOZ LF oz LF GS LF ST LF POL WEIGHT2 LF kg LF P1 1 LF POL minus sign for negative weight or a space for a positive weight WEIGHT 6 character field plus decimal if needed WEIGHT2 Kilogram weight 6 character field plus decimal if needed WEIGHTLB pound portion of Ib oz weight WEIGHTOZ ounce portion of lb oz weight WEIGHTLB and WEIGHTOZ total 5 characters plus decimal SP ASCII space ST MOT if in motion or four 4 spaces if stable CR Carriage return LF Linefeed Separator not printed Bi directional Communications The scale will respond to the following single letter ASCII commands W initia
12. allation Unpacking Installation Before unpacking your Doran scale please read the instructions in this section Your new scale is a durable industrial product but it is also a sensitive weighing instrument Normal care should be taken when handling and using this product Improper handling or abuse can damage the scale and result in costly repairs that may not be covered by the warranty If you notice any shipping damage notify the shipper immediately Please observe the following precautions to insure years of trouble free service from your new scale 1 DO NOT drop the scale DO NOT immerse the scale DO NOT drop objects on the scale Carefully remove the scale from the shipping carton Be sure to retain all shipping materials in case the scale must be shipped elsewhere Place the scale on a stable flat surface Verify that the bubble level located under the platter shows that the scale is level Adjust the four feet to obtain a level condition bubble in center Electrical Connections The PC 400 uses a wall mounted transformer or an internal rechargeable battery to provide power to the scale The transformer requires 115 VAC 50 60 Hz power Be sure that the power outlet and transformer are not exposed to water while the scale is plugged in Care amp Cleaning With reasonable care this product will last for many years Here are some tips to care for your PC 400 Portion Control Scale e Hand clean with a damp c
13. eep Function The PC 400 has a feature called Auto Shut down that turns the scale off after a preset time of no activity This helps conserve battery life The preset time is selectable from 1 minute to 60 minutes or it can be disabled so the scale remains on continuously The default setting is 5 minutes Section 3 Setup and Calibration Guide Power connections The PC 400 is powered from a wall mounted transformer or the internal rechargeable battery The transformer has a power cord which plugs into the power jack located on the back of the scale RS 232 Connections The PC 400 has a standard RS 232 output To use this feature the optional RS 232 cable is needed Plug one end of the RS 232 connector into the RJ 12 connector located on the rear of the scale Attach the other end to your computer or printer Calibration and Parameter Setup Battery Compartment Cover Calibration Bolt PC400 Underside 1 After applying power to the PC 400 remove the platter turn the scale over and remove the calibration bolt as shown above Place a thin blunt object through the hole and press straight down The scale should enter the Setup Calibration mode and the scale should display div 2 5 or div 5 0 or div 10 depending on the scale resolution 2 Turn the scale upright replace the platter and press the UNITS button twice The scale should now display CAL 0 3 Remove any unnecessary wei
14. emove excess weight from scale platform If problem persists recalibrate If problem still persists the pcb or load cell may need to be replaced gS oL The scale is in gross overload The load exceeds the scale rating and might result in damage to the scale Remove excess weight immediately If problem persists recalibrate If problem still persists the pcb or load cell will need to be replaced Error Messages cont What to do or check SPnL Raw counts for the span calibration is too low Refer to the Analog Setup section for raw count ranges SPnH Raw counts for the span calibration is too high Refer to the Analog Setup section for raw count ranges 20 Limited One Year Warranty Doran Scales Inc warrants its products to be free from defects in material and workmanship for a period of one 1 year from date of shipment excluding the Internal Rechargeable Battery which has a 90 day warranty Any product found to be defective within this time period may be returned to Doran s factory freight prepaid with prior return authorization and proof of purchase showing date of original sale for repair or replacement at no charge Doran s liability under this warranty is limited to the repair or replacement of the defective product and in no event shall Doran Scales Inc be liable for consequential or indirect damages to equipment or personnel Nor shall Doran Scales Inc be liable
15. gh the hole and press straight down to activate the calibration switch The scale should enter the Setup Calibration mode and the scale should display div 2 5 div 5 0 or div 10 depending on the scale s resolution O The parameters are accessed by pressing the UNITS button Pressing this button will cause the scale to step to the next parameter on the list Pressing the ZERO button will change the current parameter setting To exit the setup mode press and release the UNITS button until the scale returns to the weight mode NOTE No setup information is saved until the PC 400 exits the setup mode A power failure while in the Setup Mode will cause changes to be lost After all changes have been completed and the scale is in the operating mode replace the calibration bolt on the bottom of the scale If it is necessary to seal the scale run a lead and wire seal through the calibration bolt and the adjacent bolt Changing a Parameter Once the desired parameter has been found it may adjusted Press and release ZERO to step through the individual options When you have stepped through all of the parameters the scale will return to the weigh mode Changing Start up Units The scale will power up with the same units that it was using when it was last turned off Legal for Trade Restrictions The Legal for Trade mode disables the pound ounce mode Section 6 Setup Menus Explained Resoluton divisions
16. ght from the scale platter Press ZERO Wait for the scale to count down from 7 to 0 If the scale detects motion the display will restart the count When finished the display will return CAL F5 NOTE If r9 Err appears on the display the calibration zero is out of range Press ZERO to clear this error Refer to the analog setup section for additional information 4 Place full capacity 2lbs for the 2 2lb scale and 12lbs for the 13 2lb scale on the platter and press ZERO Wait for the scale to count down from 7 to 0 If the scale detects motion the count will restart When finished the scale will return to the weigh mode NOTE If SPnL or SPnH appears on the display the calibration span is out of range Verify that the calibration weight is correct and repeat the calibration Refer to the analog setup section for additional information 5 If additional parameter changes are needed refer to Chapter 4 Analog Setup The following table shows the acceptable Raw Counts for no load and full load Raw Counts can be viewed through the last setup parameter Refer to Section 4 Parameter Setup for more information regarding parameter viewing If the scale s raw counts are not within the ranges specified in the following table load cell may need to be replaced Scale Capacity Acceptable Raw Counts Acceptable CHANGE in for no load Raw Counts for full load 18 500 41 00
17. k for air currents and or vibration around the scale If that is the cause it may be necessary to set the AZT and nnA parameters to wider settings to compensate see the parameter section Verify that no mechanical restrictions exist i e platter rubbing something caught under or around the load cell Bubble level cannot be centered Place scale on level surface If problem persists replace the bubble level and recalibrate Scale shuts itself off or will not turn Check the AO Auto Off parameter on Increase shut off time if necessary Battery or transformer may be bad See the battery section for testing the battery and wall transformer Error Messages Error Message Er EP The setup parameters loaded in nonvolatile memory have become corrupted Verify scale parameters and calibrate rg Er The calibration zero is out of range Error is displayed after a ZERO calibration attempt Press zero to clear this error Refer to the analog setup section for additional information Pcb or load cell may need to be replaced Ldg 0 The scale is attempting to zero on power up This message will remain until the scale is stable Air currents or vibration may be the cause If problem persists the pcb or load cell may be damaged NOTE This message will not appear if parameter Suo no ov Ld The scale is in overload The load on the scale platform exceeds the scale capacity by more than 105 R
18. loth using mild detergent e Do not wash the scale in a dishwasher the removable platter is dishwasher safe e Do not use strong solvents or abrasive cleaners as this can damage the touch panel or other plastic parts e Do not drop or overload the scale e Do not use sharp objects to press any of the buttons e Always use the PC 400 on a stable vibration free surface for best weighing results Donot immerse Section 2 Scale Operations Guide Motion Indicator Low Battery Indicator Citi PC 400 ONOS Ib 160 x 0 1 oz 4500 x 2 g Weighing Units Indicators Fig 1 PC 400 Display Functions The Model PC 400 controls consist of ON OFF UNITS and ZERO buttons located next to the main LCD display The display is used to provide weight indications and operator messages describing scale operation Basic Weighing 1 Select the desired weighing units by pressing the UNITS button 2 Empty the scale platter and press ZERO to zero the scale 3 Place an item on the scale platter and wait for the MOTION indicator to go out 4 Read the weight on the display Units Select Press the UNITS button to change weight display units from lb to oz to kg to g to Ib oz Battery When the battery needs to be recharged the LO BAT indicator illuminates Power The PC 400 is powered by an AC wall transformer or the internal rechargeable battery both standard features Turn the scale on or off by pressing ON OFF Automatic Sl
19. rect number of bits The number of bits sent by the PC 400 is controlled by the data bits parity and stop bit configuration The PC 400 is factory set for eight bits no parity and one stop bit This means that the eight bits following the start bit will be data followed by a stop bit The stop bit signals the end of the data and permits the bit timer a chance to reset itself before the next data byte is sent No parity bits are sent Printer Modes The PC 400 offers four different print control modes These modes dictate when data is transmitted though the serial port Transmit on demand tod In this mode scale data is transmitted whenever a print request is received from the serial port The scale must be stable and the weight must be valid no error codes displayed before data is printed Continuous print CP In continuous print data is transmitted each time the scale has a reading ready each time the display is updated with new data Readings which occur when the scale is in motion are called out by the abbreviation MOT following the data Auto Print 1 AP1 Auto Print 1 transmits the first scale reading after the scale leaves motion The reading must be stable and must be a valid reading before it can be sent Auto Print 2 AP2 Like Auto Print 1 Auto Print 2 transmits the first scale reading following the scale leaving motion In Auto Print 2 no further readings will be sent until the scale returns to displayed ze
20. ro The reading must be stable and must be a valid reading before it can be sent 12 Data Output Format In order for the serial data sent from the PC 400 to be useful the data must be organized so that it is easy to read To accomplish this the PC 400 arranges the displayed data with additional text to indicate the active units and to indicate the presence of motion during the reading FO Format The basic data format sent by the PC 400 is illustrated in Fig 2 through Fig 4 Each line of data begins with an STX character 02 hex start of text followed by a polarity sign Space for positive and for negative which indicates the reading polarity Next the displayed weight is sent Six digits are used with a decimal point inserted in the correct position After the weight data is sent a space followed by the units are added to the string If the scale is stable a space is printed else MOT is printed instead The string is then finished by adding a carriage return and a line feed STX ASCII character 02 hex normally a non printing character replaced with a space if negative weight Leading zeros are replaced with spaces Space Carriage return amp line feed ASCII characters 13 amp 10 STX__2 452 lb MOT CR LF Displayed weight data os Motion indicator Printed only when with units Ib oz kg g scale is in motion Space if stable Fig 2 Format FO standard form 13
21. tes transmission of current weight data if scale is stable U changes the displayed weight units Z zeroes the scale if in motion scale will wait until stable then zero RS232 Pin outs Pin Function NC T NC RXD TXD NC RJ11 As viewed from rear of scale OORUN Section 8 Specifications Model PC 400 Power Supply Wall Transformer output scale input 12VDC 300mA Neg center Internal rechargeable battery Indicator Capacities Printer Interface 17 Section 9 Troubleshooting General problem resolution Weight reading will not repeat or Make sure that the scale platter is not scale does not return to zero when rubbing or touching the scale cover Verify weight is removed that there is nothing caught in the platform under or around the load cell or spider Scale overloads early Verify scale calibration is correct If problem persists recalibrate the scale Scale will not come to zero when the Make sure that the scale is becoming ZERO button is pressed stable Motion annunciator is off If problem persists there may be a problem with the touch panel or pcb NOTE After pressing the zero button the scale should zero as soon as it becomes stable Weight readings don t seem to be Verify the scale calibration with an correct accurate test weight If the readings are not correct recalibrate Scale drifts off zero Chec
22. will power up in grams The scale will power up in pounds and ounces Operation Mode Sets the scale for Legal for Trade mode 4 amp Standard mode NOT legal for trade Me Handbook 44 Legal for trade Raw Counts HHH Raw counts from A D converter View these numbers if calibration is unsuccessful Refer to Section 3 for interpretation of these numbers Press UNITS to exit Indicates parameters available from the front panel setup 10 Section 7 Data Communications Introduction to data communications In the PC 400 data is sent to a printer or computer by using asynchronous serial data communications Data is broken up and sent one piece at a time to the printer or computer In spite of this apparent simplicity a basic understanding of serial data communications is needed when setting up the PC 400 The PC 400 transmits letters and numbers by replacing the letter or number with an eight bit ASCII code This code is then transmitted one bit at a time A bit is the smallest unit of data and can have a value of 1 or 0 By combining eight bits into a byte it is possible to get 256 unique bit patterns These patterns are used to create the ASCII codes used by the PC 400 to represent letters and numbers When setting up a serial communications system there are several concerns which affect the configuration of that system These are e transmission rate e knowing when data starts and stops
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