PC-902 Counting Scale PC-902 User Instructions ENGLISH - USA 43000-0018 Issue AC June 2008
© Avery Weigh-Tronix LLC, 2006. All rights reserved. The information contained herin is the property of Avery Weigh-Tronix LLC and is supplied without liability for errors or omissions. No part may be reproduced or used except as authorised by contract or other written permission. The copyright and foregoing restriction on reproduction extend to all media in which the information may be embodied.
Contents page Contents ......................................................................................................................... 3 Introduction..................................................................................................................... 5 Keyboard and Display .................................................................................................... 6 Scale Setup and Operation ...................................................................................
PC-905 Counting Scale User Instructions
1 Introduction This manual tells you how to operate the PC-902 high precision counting scale. You can configure your scale for different options and sampling methods. See the PC-902 Service Manual for details on configuration and calibration. This scale also has an RS-232 I/O channel for communication with appropriate remote devices.
Keyboard and Display 2 Keyboard and Display Figure 2.1 shows the front panel of the PC-902. This is made up of the keyboard and display. Figure 2.1 PC-902 Front Panel There are six keys to the right of the display: • PRINT Sends serial data from the RS-232 port to a connected printer. If the unit is configured for PC or Broadcast mode, this key will not function. See the Service Manual. • UNITS Press this key to change the displayed unit of measure. If enabled, the choices are lb, kg, g, and oz.
The display has seven alphanumeric characters for displaying numbers and messages. Annunciators are built into the display to indicate the following functions: PC-902 Counting Scale User Instructions • COUNT Annunciator indicates the scale is in count mode. • WEIGHT Annunciator indicates scale is in weight mode. • lb, kg, g, oz Annunciator indicates the current unit of measure. • LO BAT Annunciator indicates the battery has 1 or 2 hours of battery life remaining, depending on battery installed.
Scale Setup and Operation 3 Scale Setup and Operation This section of the manual covers getting your scale ready to work and operating the scale. This section is divided into the following: 3.1 • 3.1 - Unpacking the Scale (page 8) • 3.2 - Installing the Scale (page 8) • 3.3 - Battery Power Option (page 9) • 3.4 - Operation as a Scale (page 10) • 3.5 - Operation as a Counting Scale (page 11) • 3.6 - Counting Using Bulk Sampling (page 12) • 3.
3.3 Battery Power Option 3.3 Battery Power Option The PC-902 has an internal and an external battery option. The battery can be recharged in place by connecting the transformer to a power source and to the scale. The battery will recharge while the scale is being powered by the transformer. See the Battery Information table below for information on charge times, etc. The battery circuits are designed with overcharge protection. Press the SAMPLE key on the front panel to turn the scale on.
Scale Setup and Operation 3.4 Operation as a Scale The PC-902 can be used as a bench scale or as a counting scale. The annunciators indicate when you are in the weigh mode or count mode and when the unit is configured for pounds, kilograms, grams, or ounces. While in weight mode, press the UNITS key to change the unit of measure.
3.5 Operation as a Counting Scale 3.5 Operation as a Counting Scale Counting consists of two major steps; entering a piece weight and adding the items to be counted. You enter the piece weight in one of these ways: • bulk sampling or dribble sampling (bulk is the default method) • reverse sampling, method 1 or method 2 (method 1 is default). This can be used if either bulk or dribble is enabled.
Scale Setup and Operation 3.6 Counting Using Bulk Sampling Bulk sampling is an automated sampling method. You place all the items to be sampled on the scale at the same time and the scale will automatically calculate the piece weight and display the count, without any further action. Follow these steps for bulk sampling. If you have a container, place it on the scale and press the TARE key to tare the container. This can be done in count or weight mode. 1.
3.7 Counting Using Dribble Sampling 3.7 Counting Using Dribble Sampling Dribble sampling requires one more step than bulk sampling You can count the items to be sampled onto the scale and then press the SAMPLE key to begin the piece weight calculation. This can be handy if the items are more easily counted onto the scale one at a time versus all at once. Follow these steps for dribble sampling.
Scale Setup and Operation 3.8 Using Reverse Sampling for Counting, Method 1 Method 1 or 2 are chosen in the Service Menu. See the Service Manual for instructions. Reverse sampling occurs when you place an unknown number of items on the scale, determine a piece weight (by method 1 or 2), and the scale counts items as they are removed from the scale. Method 1 and 2 are slightly different. Method 1 results in negative counts as parts are removed. Method 2 results in positive counts as parts are removed.
3.9 Using Reverse Sampling for Counting, Method 2 3.9 Using Reverse Sampling for Counting, Method 2 Method 1 or 2 are chosen in the Service Menu. See the Service Manual for instructions. Reverse sampling is independent of the bulk or dribble modes. It does not matter which of those you have enabled. Reverse sampling occurs when you place an unknown number of items on the scale, determine a piece weight (by method 1 or 2), and the scale counts items as they are removed from the scale.
Serial Communications 4 Serial Communications This section covers the serial communications capabilities of the PC-902. In this section you will find: Default serial settings are: 9600 Baud, 8 databits, No parity, and 1 stop bit 4.1 • 4.1 - Cable Pinouts (page 16) • 4.
The functional pinout is as follows: DB-9F Scale Serial I/O Connector Pin PC-902 Counting Scale User Instructions Signal Description 1 Reserved 2 TXD 3 RXD 4 Reserved 5 SIG GND 6 Reserved 7 Reserved 8 Reserved 9 +5V 17
Serial Communications 4.2 Preset Print Formats Imp Printer Formats 8 Formats are available with the Imp printer selected. LEGEND: CR = carriage return LF = line feed SP = space U = units character W = net weight character C = count character T = Tare character G = gross weight character P = piece weight character I = weight type identifier ‘G’, ‘T’, ‘N’ (gross, tare or net) 1. Ft 1 = Net weight onlyWWWW.WW 2. Ft 2 = Net weight with unitsWWWW.WWUU 3.
4.2 Preset Print Formats 4. Ft 4 = Displayed count or weight with identifierIn COUNT MODE, CCCCCCCPCS In WEIGH MODE, IWWWW.WW 5. Ft 5 = Displayed weight with identifier and unitsIn COUNT MODE, CCCCCCCPCS In WEIGH MODE, IWWWW.WWUU 6. Ft 6 = Net weight with units, count and piece weightNet Count = WWWW.WWUU(Net = or Gross = ) = CCCCCCC Piece Wt = PPPPPPUU 7.
Serial Communications 8.
4.2 Preset Print Formats Zebra 2844 Printer Formats Time and date will appear only if the printer has this option installed.
Serial Communications PC Protocol The scale's RS-232 bidirectional communication works in a master/slave protocol. A computer or master sends a command code to the scale (slave) which will return a response to the master device or perform a scale function. Commands to the scale are in uppercase, terminated with a carriage return. Scale responses begin with the lowercase equivalent of the command code.
4.
Serial Communications NCI Protocol Key to symbols used: Start of Text End of Text character Line Feed character Carriage Return character Space X Weight characters from display including minus sign and outof-range characters HML... Three status bytes uu Units of measure (lb, kg, oz, g, etc. using ANSI standard abbreviations). Command Possible Scale Response Notes* Descriptions W XXXXX.XXuu[HML] XXXXX.
4.2 Preset Print Formats The NCI protocol may have three status bytes.
Serial Communications Broadcast Protocol Broadcast protocol will support the use of the RD-4100, RD-6100 and Evolution series indicators as remote displays.
5 Error Messages The error messages you might see on the display are shown below. Error message no CAL Scale has not yet been calibrated Lo bAt Low Battery voltage SPL Err - Abort CAn't PC-902 Counting Scale User Instructions Error condition Sampling error, aborting process. Use next available sample size.
Error Messages 28 PC-902 Counting Scale User Instructions
6 Specifications Capacity (lb) Available Countby Values 5,000d NTEP (Default) 25,000d 50,000d 100,000d 10 .002 .001 .0005 .0002 .0001 25 .005 .002 .001 .0005 .0002 50 .01 .005 .002 .001 .0005 100 .02 .01 .005 .002 .001 Capacity (kg) Available Countby Values 5,000d NTEP (Default) 25,000d 50,000d 100,000d 5 .001 .0005 .0002 .0001 .00005 12 .002 .001 .0005 .0002 .0001 25 .005 .002 .001 .0005 .0002 50 .01 .005 .002 .001 .
Specifications Internal Resolution: 1:2,000,000 Dimensions: Weighing Platform: 12.6” X 14.08”, 25, 50 & 100 lb capacity 8” diameter, 10 lb capacity Display Assembly: 6.31” x 12.86” Overall Dimensions: 17.50” x 14.08” x 4.25-5.40” Construction: Diecast aluminum base and load bridge, Stainless Steel Weight Platter, ABS plastic display assembly Display: Large 0.5” H 7-digit / 7-segment Backlit LCD display.
Avery Weigh-Tronix USA 1000 Armstrong Dr. Fairmont MN 56031 USA Tel: 507-238-4461 Fax: 507-238-4195 Email: industrial@weigh-tronix.com www.wtxweb.com Avery Weigh-Tronix UK Foundry Lane, Smethwick, West Midlands, England B66 2LP Tel: +44 (0)870 903 4343 Fax: +44 (0)121 224 8183 Email: info@awtxglobal.com www.averyweigh-tronix.
