Avery Weigh-Tronix PC-820 User manual

PC-820/821 Parts Counter
Service Manual

2PC-820/821 Parts Counter Service Manual

3
PC-820/821 Parts Counter Service Manual
Table of Contents
Table of Contents........................................................................................................3
Specifications ..............................................................................................................4
Introduction .................................................................................................................5
About This Manual ................................................................................................5
PC-820 Description .....................................................................................................5
Front Panel Keys...................................................................................................6
Hard Keys........................................................................................................6
PC-820 Menus ............................................................................................................6
Entering the Menu.................................................................................................7
Test Menu .............................................................................................................7
Setup Menus .........................................................................................................9
User Menu (password is 111) .........................................................................9
Configuration Menu (password is 2045) .......................................................12
Calibration Menu (password is 30456)..........................................................20
Configuration of Remote 1 for Analog Scale Base .................................21
Calibration Error Messages.....................................................................21
Serial Communication ...............................................................................................22
Scale Status Byte Definition................................................................................24
Appendix A: Available PC-820 Displays ...................................................................25
Appendix B: Tips on Using Harmonizer ....................................................................27
Technical Drawings and Parts Lists.................................................................... 29-46
10 lb / 5 kg 12" x 14" Parts and Assembly..........................................................29
Draft Shield Parts and Assembly ........................................................................30
50 lb / 25 kg and 100 lb / 50 kg 12" x 14" Parts and Assembly..........................31
System Wiring Block Diagram ............................................................................32
Main Computer & I/O, Remote Analog, Internal Battery Charger PC Boards ....33
Display & Interface Bd. Display Assembly, Keypad Assembly and Matrix .........34
Internal Battery & Charger PC Board Parts and Assembly ................................35
Dimensional Outline for 12" x 14" Base ..............................................................36
COM2 Interface Cable Options and Pin-outs .....................................................37
COM1 Interface Cables, 820 to Quartzell Base and 820 to Eltron Printer
Cable Assemblies..........................................................................................38
BP-25R External Battery .....................................................................................39
Zeus Kits, Internal and External ..........................................................................40
SSCU Parts and Assembly .................................................................................41
SSCU-8 Remote Expanded Control I/O Board ...................................................42
SSCU External (16) I/O Cutoff Expansion Board ...............................................43
Remote (TTL) Keyboard Options........................................................................44
Opto-22 Control Interface Devices......................................................................45
Wiring Diagram for Input and Output Modules ...................................................46
Pages are numbered consecutively beginning with the cover page.

4PC-820/821 Parts Counter Service Manual
Capacity Resolution Expanded
Resolution
10 lb .001 lb .00005 lb
50 lb .005 lb .0002 lb
100 lb .01 lb .0005 lb
5 Kg .0005 Kg .00002 Kg
25 Kg .002 Kg .0001 Kg
50 Kg .005 Kg .0002 Kg
In-line transformer, 115 VAC, 50/60 Hz
Optional 230 VAC, 50/60 Hz
Zero, Tare, Enter, Escape, Clear, 0-9, Decimal Point, Previous, Next, and 5
Softkeys
All keys provide users with tactile and (configurable) audio acknowledgment
when they are activated
Display symbols include Stability, Active Tare, Current Base, Center of
Zero, Low Battery, Unit of Measure and Display Label
240 x 64 dot matrix LCD display
5" x 1.33" displayable area
PC-820: Cold cathode fluorescent backlit (white on blue)
PC-821: LCD without backlight
Selectable update rate: 0.5, 1, 2, or 5 times per second
Pounds, kilograms, grams, ounces, pounds and ounces, and two fully
customizable units of measure
Up to 1 part in 500,000
Battery protected real time clock (Y2K compliant)
Quartzell: 1 part in 2,000,000
Analog (optional): 1,000,000 counts analog
Fully selectable to ignore noise and vibration
Capable of storing 1000 records including part number, description, count
accumulator, tare, and piece weight. (Database is very flexible and number
of records is dependent upon record content and BASIC application.)
Scale has 2 power-saving timers; one controls backlight and another has
capability of shutting the scale off. Any keypress wakes the scale.
Specifications
Capacities and Resolutions
Power
Operational keys
Annunciators
Display
Display rate
Units of measure
Displayed resolution
Time and date
Internal resolution
Harmonizer digital filtering
Memory
Power saving

5
PC-820/821 Parts Counter Service Manual
Introduction
PC-820 Description
This manual covers the information you need to configure and service your
PC-820 parts counting scale.
Major sections of this manual are headed by titles in a black bar like Intro-
duction above. Subheadings appear in the left column. Instructions and text
appear on the right side of the page. Occasionally notes, tips, and special
instructions appear in the left column.
The PC-820 is a 12” x 14” scale with an attached 5” x 12” display housing.
See Figure 1. The scale base is cast aluminum enclosing a Quartzell®
weight sensor and electronics package. The scale platter is stainless steel.
Figure 1
PC-820 front panel
The display is a 64 x 240 dot matrix which allows several lines of text and
the ability to display graphics. See Appendix A: Available PC-820 Displays.
There are five softkeys located directly below the display, a numeric keypad
to the right and six other labeled keys. The keys will be described in the next
section.
Built into the PC-820 are two RS-232 serial communication ports (Com1 and
Com2). Com1 can also be used as an RS-485 port. See the section Serial
Communication for information on setting up Com1 as RS-485. Com2 can
be a bidirectional RS-232 port or a printer, keyboard and scanner port.
This scale has an internal database and can have the option card to support
a remote Quartzell®or analog base. Com3 is the local Quartzell interface.
About This Manual
The unit must be plugged into
an easily accessible outlet that
is earth grounded and of the
appropriatevoltage.
To increase the contrast of the
display, press and hold the
CLEAR and 9 keys until the
desired contrast is reached. To
decrease contrast, press and
hold the CLEAR and 3 keys.
References to the PC-820 also
apply to the PC-821.
If you upgrade the firmware in
the scale, you must download
your software program from
SimPoser.

6PC-820/821 Parts Counter Service Manual
Front Panel Keys The keys on the front panel of the PC-820 are of two types; hard keys and
softkeys. Hard keys are labeled directly and softkey labels appear on the
display. Softkeys function differently at different times and their labels
change as needed.
Below are brief descriptions for each of the hard key functions:
ESCAPE Press the ESCAPE key to back out of menus or cancel a
numeric entry without accepting the value.
ZERO Press the ZERO key to establish a zero reference. When
the scale is at zero, the center-of-zero icon will be displayed.
When scale motion ceases, the stability symbol will appear
above the center-of-zero icon.
TARE With an empty container on the scale, press the TARE key
to enter an active tare weight. The display shows net weight.
ENTER Press the ENTER key to accept displayed information,
whether it is numeric characters you have keyed in or if it is
a choice displayed while in the menus.
CLEAR Press the CLEAR key to clear a displayed number while in
the data entry mode.
0-9 & .Use the numeric keys for entering in numbers or a decimal.
Right Arrow Press this key to scroll through extra softkeys available in
some applications and to move to the right in the menus.
Left Arrow Press this key to scroll through extra softkeys available in
some applications and to move to the left in the menus.
Hard Keys
PC-820 Menus
Information about the scale, testing functions, data management, scale
configuration, and calibration are accessed through menus, some of which
are protected by passwords. The password protected menus appear under
Setup. The user menu is also protected by a password. It is covered in the
User's Manual.
Figure 2
Menu Structure
Center of Zero icon
Stable scale icon

7
PC-820/821 Parts Counter Service Manual
The display will instruct you
how to exit from a display
screen. Press ESCAPE to
back out of most screens. This
will cancel any values you’ve
keyed in. Press ENTER to
accept changed values.
Entering the Menu To enter the menu, press and hold the ESCAPE key until the unit beeps.
The menu structure is pictured in Figure 2. The words in the rectangles
represent softkeys you will see on the display.
Upon entering the menu the display shows the following softkeys:
About Press this softkey to see the scale model name, firmware ver-
sion, license number and licensed company of the downloader
program, the file name, download time and date the file was
downloaded.
Audit Press this softkey to display the calibration and configuration
audit trail counters. The configuration counter increments each
time the configuration menu is accessed or when a new configu-
ration file is downloaded. The calibration counter increments each
time a base is calibrated. These numbers cannot be erased or
changed by the user.
Test Press this softkey to access the test menus for the display,
keypad, local or remote Quartzell bases or a remote analog base,
serial ports, outputs and inputs. Follow prompts on the display to
accomplish these tests. See Figure 3 and the Test Menu section
below for more information.
Setup Press this softkey to access the password protected menus. The
names and passwords for the Setup menus are:
User menu password - 111
Configuration menu password - 2045
Calibration menu password - 30456
See Figure 4 and the Setup Menu section below for more infor-
mation.
Off Press this softkey to turn the PC-820 off. Pressing any key will
turn the scale on.
The Test menu, shown in Figure 3, lets you test your scale operation.
Figure 3
Test Menu
Following are explanations of the tests in this menu.
Test Menu

8PC-820/821 Parts Counter Service Manual
Display This test continuously cycles the display through various pat-
terns.
Keypad This test lets you check each front panel key for proper opera-
tion.
Bases This key allows you to view the output from the selected base.
(Local, Remote 1 and Remote 2, if connected).
For Quartzell bases you will see a screen similar to this:
This screen shows you:
• the serial number of the Quartzell in the currently selected
base
• the raw counts from the cell (which should be stable ±200
counts and increase when weight is applied)
• the tension frequency (Ft) and compression frequency (Fc)
(Each should be as stable as the other and within 10% of
each other. As weight increases the tension count should
increase and the compression count should decrease.)
• Cell size (30Kg for example)/Display resolution for maximum
efficiency (10000 is shown)
• Software version of the cell (vD.A in this example)
For analog bases you are shown:
• a raw count value and its equivalent mV/V value. (These
values should be positive and increase as weight is applied.
Serial Use this to test your ports. Select Port #1, 2, or 3 then short the
TX and RX on the selected port. The display will change from
NO LOOP to LOOP indicating the port is good.
Port 1 is Comm1, a 9-pin connector. Short pins 2 and 3 for
Loop/No Loop test. Short pins 7 and 8 for Ready/Busy test.
Port 2 is Comm2, a 15 pin connector. Short pins 3 and 5 for
Loop/No Loop test on RS-232-A. Short pins 2 and 5 for Loop/No
Loop test on RS-232-B.
Port 3 is the local Quartzell. Use the local base test to verify
current cell communication.
Outputs Allows you to Activate/Deactivate any output setpoints you are
using on the SSCU8 to verify correct hardware operation during
installation or for troubleshooting purposes.
Inputs The same as Outputs except you are activating an input set-
point device such as a switch or contact closure remotely and
monitoring it with this menu.
Display Softkey
Keypad Softkey
Bases Softkey
Serial Softkey
Outputs Softkey
Inputs Softkey

9
PC-820/821 Parts Counter Service Manual
This section covers the User, Configuration, and Calibration menus shown
in Figure 4a and 4b.
The user menu is explained below. Refer to Figure 4a. Access this menu by
following these steps:
1. Press and hold the ESCAPE key
until the scale beeps and new
softkeys appear.
2. Press the SETUP softkey. . . Scale prompts for a password.
3. Key in 111 and press ENTER. . . New softkeys appear:
Set, Select and BASIC. Each of
these are discussed below.
Press Set:
The following softkeys are displayed:
Clock Follow the prompts on the screen to set the time and date.
Tare Prompts you to enter a tare value. Use this when you want to set
a long term tare value for all scales. If you set this tare you should
disable the TARE key. See the Service Manual.
Pc. Wt. Prompts you to enter a piece weight value. Use this when you
want to set a long term piece weight value. If you set this tare you
should disable the SAMPLE softkey. See the Service Manual.
Peaks Prompts if you want to clear the minimum and maximum peak
values in memory. Display gives you YES and NO softkeys.
Accum. Prompts if you want to clear all accumulators. Display gives you
YES and NO softkeys. You are then asked if you want to enable
or disable count subtracting. Choose from YES or NO.
Graph Prompts you to key in values for each of the following values
used when in checkweigher display:
Min for minimum value
Under for lowest acceptable target weight
Over for highest acceptable target weight
Max for maximum value
Basis select the basis from this list of values:
0 = Gross
1 = Net
2 = Tare
3 = Min
4 = Max
5 = ROC
6 = Gross total
7 = Net total
8 = Count total
9 = Transaction total
10 = Count
11 = Variable
12 = Piece weight
13 = ADC
User Menu (password is
111)
Set Softkey
Setup Menus

10 PC-820/821 Parts Counter Service Manual
Figure 4a
Setup Menus

11
PC-820/821 Parts Counter Service Manual
Figure 4b
Setup Menus
Press Select:
The following softkeys are displayed:
Display You are prompted to enter a display mode number (1-20). See
Appendix A: Available PC-820 Displays.
Base You are asked to pick the active scale base. Only active bases
are offered as choices.
Unit You are asked to select the active unit of measure from this list:
lb, kg, gram, oz, lb-oz, custom 1, custom 2
In this selection you can view the values of all the variables in the BASIC
program (Vars) and all the values stored in nonvolatile memory (Stores).
Under Vars are softkeys for moving through the list of variable values:
FIRST Moves to the first variable in the list.
NEXT Moves to the next variable in the list.
EXIT Returns to the previous menu.
Select Softkey
BASIC Softkey

12 PC-820/821 Parts Counter Service Manual
The next menu is the configuration menu. See Figure 4. Access this menu
by pressing and holding the ESCAPE key until the unit beeps. Press Setup
softkey, then key in 2045 and press ENTER. The following softkeys are
displayed:
•Scale
•Base
•Serial
•Exit
The items found under each of these keys is discussed below.
The Scale softkey gives you access to items for setting general scale
parameters. For example, you set the number of bases attached, count
parameters, sleep timer, enable and disable keys, select date format..
The first softkey under Scale is # Bases. Press this and you are prompted
to key in the number of remote bases (0-2) attached to the PC-820. Remote
1 is Quartzell by default. You can set Remote 1 to work with an analog base.
If two remote bases are used, remote 2 must be analog.
Press the Units softkey and you are prompted to enable or disable each of
the following units of measure:
• lb (only one enabled on first power up)
•kg
•g
•oz
• lb-oz
• Custom 1
• Custom 2
If you enable a custom unit you are asked to key in a multiplication factor,
based on the calibration unit of measure, to be used to calculate the custom
unit.
Configuration Menu (pass-
word is 2045)
Scale Softkey
# Bases Softkey
Units Softkey
lb is the only enabled unit of
measure in a new scale.
Under Stores there are two types of volatile memory you can choose to see;
numerics or strings. Under each you are given these softkey choices:
Prev Moves to the previous indexed location.
Next Moves to the next variable in the list.
Select Lets you enter the index number you want to recall.
Exit Returns to the BASIC menu.
Below are the memory locations for standard and expanded memory:
Numeric String
Standard 0-8191 0-4095
Expanded 0-16383 0-8191
If only one unit of measure is
enabled, there is no UNITS
softkey available.

13
PC-820/821 Parts Counter Service Manual
Press the Count softkey to set the following counting parameters:
•sMode = Sample Mode:
Choose from Bulk or Dribble (default is Bulk)
Bulk mode: Place all of the sample on scale at one time.
After motion stops, the count is automatically displayed.
Dribble mode: Place sample on scale, then press EN-
TER. After motion stops, the count is displayed.
•sSize = Sample Size:
Key in a minimum sample size (default is 5)
•%sAccy = Minimum Percentage Sample Accuracy:
Choose from OFF, 95%, 98% or 99%. (default is 98%)
•sWeight = Minimum Sample Weight as percentage of full scale:
Choose from 0.01%, 0.005%, 0.002%, and 0.001%
(default is 0.001%)
•pw Rnd. = Piece Weight Rounding:
Choose from OFF, 0.5%, 1%, and 2%. (default is OFF)
•Base Sw. = Base Switching: (You must have selected and configured
a remote base for this function to work.)
Choose to enable or disable auto base switching mode.
(default is No)
Auto base switching lets you perform sampling on one
scale (local or remote) and the scale will automatically
switch to another scale for counting.
If you enable this mode you are asked to choose the
sampling scale and then the counting scale. The default
sampling scale is Local and the default counting scale is
Last. Choose Last to return to the scale you were using
before you did your sampling.
• Options = Sample Parameter Switching Options:
When the scale is in sampling mode there are several
features, functions or modes you can change if they are
enabled. If they are not enabled, the configured choices
are used. Here is where you can enable or disable those
features. The features are:
Sample Mode Switching - Lets you switch between bulk
and dribble sampling while in the sample mode.
Sample Base Switching - Lets you switch bases for
sampling and counting while in the sample mode.
Minimum Sample Weight Switching - Lets you change the
minimum sample weight while in the sample mode.
Sample Accuracy Switching - Lets you change the
sample accuracy while in the sample mode.
•Latch = Count filter and sample latching mode:
Count filter:
You can choose a count filter of OFF, Fast or Slow.
(Default is Fast).
The count filter, which can also be called count latching,
Count Softkey
Piece weight rounding occurs
after the piece weight has been
calculated.
Without a BASIC application
you will not be able to do a
sample routine.

14 PC-820/821 Parts Counter Service Manual
Sleep Softkey
Beeper Softkey
To replace default values, key
in a new value and press
ENTER to accept it. Remem-
ber, you can press the CLEAR
key to erase entered numbers.
Keys Softkey
Values Softkey
helps lock onto a count value when piece weights are
less than a division size. Choose Fast for some filtering
and Slow for more filtering.
Sample Latching: Off, 1 piece, 2 pcs
Latching, if enabled, gives the appearance of stability
immediately following the sample process. The sample
latch is broken when motion is detected or if the calcu-
lated count is over two pieces away from the sample size.
The latch will not function again until another sample
process is completed.
Press the Sleep softkey to enable or disable the sleep timer and the back-
light timer.
If you enable (default is disabled) the sleep timer you are prompted for a
time in minutes (default is 10), then prompted to enable or disable a sleep
warning beeper (default is Yes). If no scale activity occurs in this period the
scale will turn itself off preceded by a series of warning beeps. Press any
key to reactivate the scale.
You are also prompted to enable the backlight timer (default is yes). If you
choose Yes you are prompted for a time in minutes (default is 5). After no
scale activity for the specified time the backlight will turn off. Press any key
to reactivate the backlight. Scale motion also turns the backlight on.
The sleep and backlight timers reset when there is motion, a keypress,
remote input, or a keypress from a remote keypad. The sleep timer also
resets upon a BASIC subroutine call and is disabled when BASIC is running,
if the BASIC application is programmed to do so.
Press the Beeper softkey to choose a beeper volume. Choices are OFF,
Low, Medium, and High. Default is medium.
Press the Keys softkey to enable the following keys:
TARE; ZERO; Print softkey; Select softkey; Recall softkey; DBase softkey;
Accum softkeys; Base softkey; OFF softkey; Clear softkey.
All these keys can be enabled by the firmware in the PC-820, but the BASIC
application in the PC-820 will need additional code for these keys to func-
tion.
Press the Values softkey to enable the viewing of the following values when
you press the Select softkey. (This assumes you have the Select softkey
enabled.)
#0 Gross (default is Yes)
#1 Net (default is Yes)
#2 Tare (default is Yes)
#3 Minimum (default is No)
#4 Maximum (default is No)
#5 Rate of Change (default is No)
#6 Gross Total (default is No)
To enable the UNITS softkey
you must enable more than
one unit of measure. If the
remote base softkey is en-
abled, the units softkey moves
one screen to the right.

15
PC-820/821 Parts Counter Service Manual
#7 Net Total (default is No)
#8 Count Total (default is No)
#9 Transaction Total (default is No)
#10 Count (default is Yes)
#11 Value (default is No)
#12 Piece Weight (default is Yes)
#13 A to D Counts (default is No)
Press the Display softkey to configure the power-up display mode and other
display items shown below. Enter a value or choice and press the ENTER
key for each.
Power-up display mode - Choose from #1-20. Default is 2.
Power-up display value - Choose from #0-13. See list above
under Values Softkey. Default is 1.
Power-up 2nd display value Choose from #0-13. See list above
under Values Softkey. Default is 10.
Enable HIDDEN key display cycle? Default is No.
Enable lowercase for small text? Default is Yes.
Enable Low Battery indication? Default is Yes.
Enable Preset Tare annunciator? Default is off.
SAT or push-button PST or Preset/Recalled
Tare annunciator Tare annunciator
Press the Date softkey to choose the date format you want from these
choices:
M/D/Y=Month/Day/Year
D/M/Y=Day/Month/Year
Y/M/D=Year/Month/Day
Default is M/D/Y.
Press the Print Fm softkey to configure the port to use for each print format.
First you choose the default print format. Choices are from 0-32. Default is
0.
Display Softkey
Date Softkey
Print Fm Softkey
See Appendix A: Available
PC-820 Displays for
examples of each
display mode.
When this key is enabled, it
allows the display to toggle
through all the display
modes found in Appendix
A.
This allows the tare
annunciator on the
display to distinguish
between a semi-automatic tare
(SAT is a European term—
same as push-button tare in
USA) and a preset tare (PST is
a European term—same as
entered or recalled tare in
USA)

16 PC-820/821 Parts Counter Service Manual
BASE Softkey
Next you are shown the current port and what format is assigned to it for
formats 1-16. The display is shown like this (format, port):
(1, 1) (2, 1) (3, 1) (4, 1)
(5, 1) (6, 1) (7, 1) (8, 1)
(9, 1) (10, 1) (11, 1) (12, 1)
(13, 1) (14, 1) (15, 1) (16, 1)
The Edit softkey lets you change a setting. The Next softkey lets you view
formats 17-32.
Press Done when you are finished.
The Base softkey gives you access to all the configuration parameters for all
enabled bases. (See Scale, # Bases to enable remotes.) You are given the
choice of which base to configure; Local, Remote 1 or Remote 2. After you
make the choice the following softkeys appear.
Press the Enable softkey to enable or disable the current base. When the
base is disabled, the base is not available for selection by the user and the
base is ignored on power-up.
Press the Cap/Div softkey to enter the capacity and division size.
Press the Zero softkey to enter a zero range (0-100%) for the ZERO key.
Default is 100%.
Also, you can enable or disable (default is disabled) an automatic zeroing of
the scale on power up. If enabled, the scale will power up and zero any
weight on the scale. If disabled, the scale will show any weight on the scale
at power up.
Press the Stable softkey to set the stability range in divisions and the
stability delay in seconds.
For example, if you set the range to three divisions and the delay to one
second, if the weight value does not change more than three divisions in one
second, the scale is considered stable.
Default is 1 division and 1 second.
Press the AZT softkey to set Automatic Zero Tracking (AZT) range and
delay.
The division size you pick defines a range above and below zero. When
scale weight is inside this range for the number of seconds you picked, ½ of
the weight will be zeroed. The indicator will repeat removing ½ the weight
every X seconds. X being the number of seconds you have picked.
Default is 0.5 division and 1 second. Set division size to zero to disable AZT.
Enable Softkey
Cap/Div Softkey
Zero Softkey
Stable Softkey
(Motion)
AZT Softkey

17
PC-820/821 Parts Counter Service Manual
Press the Update softkey to select a display update rate from these
choices:
0.5 Hz; 1 Hz; 2 Hz; 5 Hz
Default is 5 hz or five times per second.
Press the Filter softkey to set up the HarmonizerTM filtering. A full explana-
tion of the HarmonizerTM is given below.
The weight conversion for PC-820 connected bases is:
• Local Quartzell = 50 updates/second (set AVG to 1)
• Remote Quartzell = 6 updates/second (set AVG to 1)
• Remote analog = 60 updates/second (set AVG to 12)
AVG is the number of conversions you want to average. For example, with
an analog base, if you pick 30, the unit will average the weight values from
the last 30 conversions or ½ second and uses that value for displayed data.
The next choice you have is for turning the Harmonizer filtering on or off. If
you turn the Harmonizer filtering on you need to set the Harmonizer Con-
stant. Typical values are between 1 and 8. Set the number low for small
vibration problems and higher for more dampening effect.
The purpose of the Harmonizer Threshold is so the indicator will respond
quickly to large weight changes. Harmonizer Threshold is the amount of
weight change, in calibration units, beyond which the Harmonizer will be
temporarily disabled. For example, if you set this to 10 lbs, a weight change
over 10 pounds occurring during the sample time (½ second in our example)
will disable the Harmonizer until the weight change during the sample time
drops below 10 pounds.
Press the ROC softkey to calculate Rate of Change for time/weight based
applications. You are prompted to enter an ROC Samples value. Default is
50. You are then asked to enter an ROC Multiplier value. Default is 50.
Explanations for these are given below.
ROC Samples
The number of samples over which the rate of change of weight is deter-
mined. The PC-820 samples the Quartzell at 50 times per second (60 times
per second for external Quartzells and analog bases). If ROC Samples is
set to 50, the PC-820 is determining the rate of weight change over one full
second.
ROC Mult
The ROC Multiplier allows you to enter a conversion factor to translate
weight to some other unit of measure, such as gallons, piece weight, or
some other weight unit based upon the calibration unit of measure.
Filter Softkey
ROC Softkey
The Harmonizer default is
off. Harmonizer filtering is
not recommended for parts
counting applications using
Quartzell bases.
Update Softkey
For example: If you have one
part that weighs 8 lbs, you
calculate the multiplier using
this formula:
So in our example the equation
becomes:
and the multiplier is 0.125.

18 PC-820/821 Parts Counter Service Manual
Tare Softkey
RTZ Softkey
TimeOut Softkey
Ranges Softkey Press the Ranges softkey to set the overload and underload limits.
You can base the range on deadload or zero and then choose an over and
under range limit. If you choose deadload as the basis, the overload and
underload ranges are based on calibration zero and the ranges are entered
as a percent of capacity. Default is deadload and 102.5% of capacity.
If you choose Zero as the basis, the overload and underload ranges are
based on current zero and the ranges are entered as a number of divisions
over capacity. Default is 9 for both over and under.
Press the Tare softkey to select between live tare value and recalled or
entered tare value . When you have chosen you are then prompted to
choose between FullRes (full resolution) or Rounded. FullRes allows the
scale to use its maximum internal resolution (2,000,000) to set tare. This
allows tare values to be double precision floating decimal point. This is
usually used for counting scale applications. Choosing Rounded causes
rounding to the current division size before calculations are performed.
Press the RTZ softkey to set the Print Return to Zero and Accumulate
Return to Zero. Set these as a percentage of scale capacity. Enter in an
amount from 0-100%. To disable RTZ enter a zero for the percent.
Print Return to Zero means if you press the PRINT key with weight above
this value a print operation will occur if and when motion stops, then the
weight must fall below this percentage of scale capacity before another print
operation will be allowed. Default value is 0 which disables RTZ.
Accumulate Return to Zero means if you perform an accumulation with
weight above this value an accumulation operation will occur if and when
motion stops, then the weight must fall below this percentage of scale
capacity before another accumulation operation will be allowed. Default
value is 0 which disables RTZ.
Press the TimeOut softkey to set the timeout value, in seconds, for each of
the following parameters: (default is 0 for all)
• Print timeout
• Accumulate timeout
• Zero timeout
• Tare timeout
• Sample timeout
Timeout is the amount of time the PC-820 will wait for motion to cease and
perform the function after the key is pressed.
For example, if Zero Timeout is set to 3 seconds, when the ZERO key is
pressed the unit will zero the scale if there is no motion. If there is motion
and motion ceases within 3 seconds the unit will zero the scale. If motion
doesn't cease the key press is ignored.

19
PC-820/821 Parts Counter Service Manual
Press the Intrval softkey to set the multi-interval option. The multi-interval
option allows you to specify an alternate division size for the first X pounds
you place on the scale. X is the interval size which you specify. When multi-
interval is enabled, the division used to check for stability, center of zero,
and AZT is always the Interval-1 division. Overload and underload is always
calculated based on the normal division size.
The displaying and printing division size depends on which interval the scale
is in. The active interval is chosen based on net when when a tare weight is
active, and gross weight when a tare is not active. When weight (gross or
net) is below the Interval-1 capacity, the Interval-1 division size is used. If
the weight is above the Interval-1 capacity, the standard division is used.
When gross is displayed or printed (regardless of the tare value) the division
size used depends on the interval used.
Choose YES to enable or NO to disable multi-interval, then press ENTER. If
you choose YES the unit defaults to an interval size of one half of capacity.
You can key in any interval size you want. After entering the interval size you
are prompted to enter the division size for the interval. Key this in and press
ENTER.
Interval Softkey
When tares are configured for
Rounded the PC-820 only
allows them to be captured or
entered up to the Interval-1
capacity. Tares greater than
the Interval-1 capacity are
rejected.

20 PC-820/821 Parts Counter Service Manual
Serial Softkey Press the Serial softkey to configure the serial port parameters. Choose
from Port 1 or Port 2. The choices under each are the same. They are as
follows:
Baud Rate: 300, 1200, 2400, 4800, 9600, 19200, 38400, and 56700
Parity: None, Odd, Even, Set, and Clear
Data Bits: 7 or 8
Handshake: NONE, CTS, XonXoff, or Both
Port Mode: BASIC, Keyb'rd, Disable. Port 2 only has Split and Dual.
Port 1 only has PWLU. PWLU is for Piece Weight Lookup.
DUAL MODE: "Dual Mode" allows for 2 BASIC CONTROL
devices to be connected to Port 2. A "COM2_MESSAGE"
event responds to data received on Com 2 REC A, while a
"COM2B_MESSAGE" responds to data received on Com 2
REC B.
The only stipulation is that the 2 devices on Com Port 2
cannot send data at the same time. This mode is useful if
you have 2 devices which may send data and you need to
be able to differentiate the data received from the 2 devices
(EX: a bar code scanner and a magnetic strip reader).
SPLIT MODE: "Split Mode" allows for a KEYBOARD and a
BASIC CONTROL device to be connected to Port 2. The
port works like "BASIC CONTROL MODE" for data received
on Com 2 REC A, while also allowing for "KEYBOARD
MODE" data to be received on Com 2 REC B. The same
stipulation (2 devices on Com Port 2 cannot send data at
the same time) applies as in "Dual Mode". This mode is
useful if you have a keyboard and 2 other devices which
may send data (EX: a keyboard and a bar code scanner on
Com Port 2, along with a PC on Com Port 1).
End of Message Character: Key in an ASCII character value. Default is 13,
which is a carriage return.
Press this key to exit this menu and return to the higher menu level.
The next menu is the Calibration menu. See Figure 4a.
Access this menu by following these steps:
1. Press and hold the ESCAPE key
until the scale beeps and new
softkeys appear.
2. Press the SETUP softkey. . . Scale prompts for a password.
3. Key in 30456 and press
ENTER. . . You are then given the choice of
Local, Remote 1 or Remote 2.
Exit Softkey
Calibration Menu (password
is 30456)
Stop Bits Data Bits Parity
None 1 or 2 7 or 8 None
Odd 1 or 2 7 Odd
Even 1 or 2 7 Even
Set 2 7 None
Clear 1 8 None
Parity