Avery Weigh-Tronix PC-802 User manual

PC-802 Counting Scale
User’s Manual

2PC-802 Counting Scale User's Manual
Risk of electrical shock. Do not remove cover. No user serviceable
parts inside. Refer servicing to qualified service personnel.
Avery Weigh-Tronix reserves the right to change
specifications at any time.
CAUTION
09/28/05 802_U.P65 PN 29672-0014i e2 Printed in USA

3PC-802 Counting Scale User's Manual
Table of Contents ..................................................................................... 3
Specifications ........................................................................................... 4
Introduction .............................................................................................. 5
Keyboard and Display .............................................................................. 5
Key Functions ................................................................................ 6
Scale Setup and Operation ...................................................................... 6
Scale Setup ................................................................................... 6
Unpacking the scale ........................................................... 6
Battery power option ........................................................... 6
Installing the scale .............................................................. 6
Operation as a Scale ..................................................................... 7
Operation as a Counting Scale...................................................... 8
Bulk Sampling ........................................................................ 8
Dribble Sampling .................................................................... 9
Serial Communications .......................................................................... 10
Preset Print Formats.................................................................... 11
Computer Protocol....................................................................... 12
Error Messages ...................................................................................... 13
Table of Contents

4PC-802 Counting Scale User's Manual
Capacity Normal Resolution Expanded Resolution
10 lb 0.001 lb 0.00005 lb
50 lb 0.005 lb 0.0002 lb
100 lb 0.01 lb 0.0005 lb
5 kg 0.005 kg 0.00002 kg
25 kg 0.002 kg 0.0001 kg
50 kg 0.005 kg 0.0002 kg
Overcapacity indication (upper dashes) will occur at 9 divisions over rated
capacity or 102% of full scale capacity.
1 part in 2,000,000 (QDTTM)
Standard digital software filtering
Seven digits of seven-segment, high-contrast black LCD, .5" (1.3 cm) high
with blue electro-luminescent backlight
15VDC at 300mA from a 117VAC 60Hz inline transformer
Optional 12VDC lead acid battery
Bidirectional RS-232 output with selectable baud rate
14° to 104° F (-10° to 40° C)
10 to 90% relative humidity, non-condensing
Specifications
Capacities and Resolutions:
Overcapacity Limits:
Internal Resolution:
Filters:
Display:
Power:
Output:
Operating environment:

5PC-802 Counting Scale User's Manual
This manual tells you how to operate the PC-802 high precision counting
scale. You can configure your scale for different options and sampling
methods. See the PC-802 Service Manual for details on configuration and
calibration. This scale also has an RS-232 I/O channel for communication
with appropriate remote devices.
Figure 1 shows the keyboard and display of the PC-802. The keyboard has
five keys:
• ZERO
• TARE
• SAMPLE
• PRINT
• COUNT/WEIGH
The display contains seven digits and has four triangular annunciators:
• COUNT
• WEIGHT
• lb
• kg
and four indicators:
• ZERO
• TARE
• STABLE
• LO BAT
Figure 1
PC-802 Keyboard and Display
Introduction
Keyboard and Display

6PC-802 Counting Scale User's Manual
ZERO Zeroes the scale weight or count.
TARE Tares the weight on the scale.
SAMPLE Used to select a sample size and to initiate the
calculation of sample piece weight.
PRINT Sends data to RS-232 device.
COUNT/WEIGHT Toggles between displaying weight and count.
The PC-802 comes with the AC transformer in place beneath the scale. Plug
the unit into a grounded 120VAC source.
If you are going to use the optional DC battery power, remove the trans-
former from beneath the scale, place the battery in its place with padding
between the battery and the scale base and around the battery. Secure the
battery with the restraining strap. Plug the battery cable into the receptacle
on the back of the scale.
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.
Press any key on the front panel to turn the scale on when powered by the
battery. You can set the battery option to shutoff the scale automatically
after a period of time. See the Service Manual for this information.
Place the scale on a stable, level surface out of the way of air currents. Use
the adjustable feet to level the scale. Be sure the scale does not rock back
and forth. Lock the feet in position with the locking nuts.
Key Functions
Scale Setup and Operation
Scale Setup
Unpacking the scale
Battery power option
Installing the scale
Important!
If the scale has been recali-
brated, reset scale resolution
to your needs. Calibration
automatically sets resolution to
10000 divisions.
A PC-802 with the backlight
enabled and a fully charged
battery may be expected to last
12 hours before recharging is
necessary. With the backlight
disabled the battery will last
approximately 24 hours.

7PC-802 Counting Scale User's Manual
Operation as a Scale The PC-802 can be used as a bench scale or as a counting scale. The
annunciators indicate when you are in the weight mode or count mode and
when the unit is configured for pounds or kilograms.
Indicators let you know when the scale is stable (no motion), when the scale
is at zero and when a tare is in effect.
Follow these instructions for operating the PC-802 as a scale:
1. For AC powered models,
plug the unit into a grounded
120VAC source. . .
For battery powered models,
press any key. . . The scale performs an internal
diagnostics test, then displays the
weight in the weigh mode. The scale
is in the weigh mode when the
WEIGHT annunciator is lit.
2. Zero the scale by pressing the
ZERO key. . . The ZERO indicator illuminates.
3. For gross weighing, place the
object to be weighed on the
scale. . . Gross weight is displayed.
4. For net weighing, place object to
be tared on the scale and press
the TARE key. . . The TARE annunciator illuminates,
and zero weight is displayed.
5. Place material to be weighed on
the scale. Net weight of material is displayed.
6. If your scale is hooked up to a
printer, press PRINT to print a
weight. Weight information is printed.
The scale will always power up
in normal weighing mode.

8PC-802 Counting Scale User's Manual
There are two sampling methods which are selectable during configura-
tion—bulk sampling and dribble sampling. If you use the bulk sampling
method, you must place all the sample parts on the scale at the same time.
If you use the dribble method, you may place the sample parts onto the
scale a few at a time. The two methods are covered below.
1. In weigh or count mode,
repeatedly press the SAMPLE
key until the sample size you
want is displayed. . . Your display may show ZEro briefly.
This occurs if it takes time for the
scale to find the Zero Reference.
Your display may show no ZEro
briefly if the scale cannot find a Zero
Reference. Check to be sure the
scale is stable and retry step #1 if
this occurs. If all is OK, you will see
the following:
Add 10 is displayed. 10 is the
sample size in this example. The
minimum sample size can be
configured to be 1, 2 , 5, 10, 25, 50
or 100. See the
PC-802 Service Manual for configu-
ration instructions.
2. Place 10 sample parts on the
scale at the same time. . . StAndbY is displayed while the unit
computes the weight of the sample
and displays the count. If the scale
determines that the sample size
meets the minimum accuracy
requirement, 10 will be displayed.
If the scale determines the sample
size does not meet the minimum
accuracy requirement, the display
will prompt you to Add XXX
more parts. When prompting you,
Add will flash.
3. Add the requested samples to
those already on the scale. Wait
for the scale to stabilize, then
press the SAMPLE key. . . StAndbY is displayed while the
scale updates the piece weight. If
the sample meets the minimum
accuracy, the count will be dis-
played.
Press the COUNT/WEIGHT key to toggle between count and weigh mode.
You may tare a container while in either mode.
When you press the SAMPLE
key, the PC-802 performs an
autozero operation. So, if you
have a container on the scale
and press the SAMPLE key,
the container weight will be
zeroed and when you place the
parts to be counted on the
scale, only the weight and
count of the parts will be
computed.
Operation as a
Counting Scale
Bulk Sampling
The minimum sample size is
selectable during configuration.
Important!
If the scale has been recali-
brated, reset scale resolution
to your needs. Calibration
automatically sets resolution to
10000 divisions.
If there is no piece weight, the
scale will not go into count
mode when you press the
COUNT/WEIGHT key.

9PC-802 Counting Scale User's Manual
Dribble Sampling 1. From weigh or count mode,
repeatedly press the SAMPLE
key until the sample size you
want is displayed. . . Your display may show ZEro briefly.
This occurs if it takes time for the
scale to find the Zero Reference.
Your display may show no ZEro
briefly if the scale can not find a
Zero Reference. Check to be sure
the scale is stable and retry step #1
if this occurs. If all is OK, you will
see the following:
Add 10 is displayed. 10 is the
sample size in this example. The
minimum sample size can be
configured to be 1, 2 , 5, 10, 25, 50
or 100. See the Service Manual for
configuration instructions.
2. Place 10 sample parts on the
scale one at a time or all at once.
Wait for the scale to stabilize,
then press the SAMPLE key. . . Add will flash until the SAMPLE key
is pressed, then StAndbY is dis-
played while the unit computes the
weight of the sample and displays
the count.
If the scale determines that the
sample size meets the minimum
accuracy requirement, 10 will be
displayed.
If the scale determines the sample
size does not meet the minimum
accuracy requirement, the display
will prompt you to Add XXX more
parts. When prompting you, Add will
flash.
3. Add the requested samples one
at a time or all at once to those
already on the scale. Wait for the
scale to stabilize and press the
SAMPLE key. . . StAndbY is displayed while the
scale updates the piece weight. If
the sample meets the minimum
accuracy, the count will be dis-
played.
Important!
If the scale has been recali-
brated, reset scale resolution
to your needs. Calibration
automatically sets resolution to
10000 divisions.

10 PC-802 Counting Scale User's Manual
Pinout assignments for the serial communication are shown below.
9-pin Female
Scale
Pin Name Direction
2 TXD OUT
3 RXD IN
5SG -
You may choose to print an Orion printer bar code label. This printer has one
format shown below. It can be chosen through the configuration menu ex-
plained in the Service Manual. The active unit of measure will be printed. This
example shows the weight in LB and the time and date line. If your printer is
not equipped with time and date capability, the time and date line will not
appear on the label.
Serial Communications
Cable Pinouts
A straight through cable (1 to 1,
2 to 2, etc.) can be used from a
9-pin computer serial port to
connect this scale.
Zebra 2443 / Orion
Printer Fixed Format
Label Output
Time and date line only appear if the printer
has time and date capability.

11PC-802 Counting Scale User's Manual
There are eight preset serial print formats. Choose the one you want to use
during configuration of the scale. See the Service Manual for configuration
instructions. The formats are described below.
Abbreviations:
CR = carriage return
LF = line feed
SP = space
U = units character
W = weight character
C = count character
T = tare character
G = gross weight character
P = piece weight character
I = weight type identifier (G for gross, T for tare and N for net)
Net weight only:
WWWW.WW<CR><LF>
Net weight with units:
WWWW.WW<SP>UU<CR><LF>
GTN with units:
'G'<SP>GGGG.GG<SP>UU<CR><LF>
'T'<SP>TTTT.TT<SP>UU<CR><LF>
'N'<SP>WWWW.WW<SP>UU<CR><LF>
Displayed weight with identifier:
I<SP>WWWW.WW<CR><LF>
In Count Mode: N<SP>CCCC<SP>PCS<CR><LF>
In Weigh Mode: I<SP>WWWW.WW<SP>UU<CR><LF>
Net weight with units, count and piece weight:
Net = WWWW.WW<SP>UU<CR><LF> (Net = or Gross =)
Count = CCCCCCC<CR><LF>
Piece Wt = .PPPPPP<SP>UU<CR><LF>
Fixed length (nine digits) displayed weight with units.
sxxxxx.xx uu<CR> (s= positive (a space) or negative (-) weight)
COUNT: CCCC<SP>PCS<CR><LF>
Preset Print Formats
Format 0
Format 1
Format 2
Format 3
Format 5
Format 4
Format 6
If the scale is in count mode,
displayed weight formats will
send weight, not count.
Format 7

12 PC-802 Counting Scale User's Manual
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.
Computer Protocol
Legend:
1) "_" ....... represents the ASCII space character
2) "u" ....... represents the units of measure character(s):
........... "LB" for pounds
........... "KG" for kilograms
........... "G" for grams
3) <CR> .. represents the ASCII carriage return
4) HML .... represents three bytes of scale status information as described on
the next page.
5) Value entered is assumed to be in same units of measure as what the
scale is currently in.
6) Display messages are limited to seven characters.
COMMAND RESPONSE DESCRIPTION
CA<CR> none Clear Sample
CC<CR> cc_xxxxx<CR> Request piece count
CP<CR> cp_x.xxxxxxuu<CR> Request piece weight value
CM<CR> none Switch to count mode
DIxxxxxxxx<CR> none Display Message xxxx
(message is 8 characters max)
IC<CR> none Reset Scale (warm start)
PWx.xxxxx_uu<CR> none Loads x.xxxxx as piece weight
TR<CR> tr_ _ _ _x.xxxuu<CR> Request tare value
TZ<CR> none Clear the current tare
Txxxx.x_uu<CR> none Loads xxxx.x as tare
WD<CR> wd_ _ _xx.xxx<CR> Request net weight
WE<CR> we_ _ _xx.xxxuu<CR> Request net weight with units
W<CR> we_ _ _ _x.xxxuuHML<CR> Request net weight with units
and status
WG<CR> wg_ _ _xx.xxxuu<CR> Request gross weight with
units
WM<CR> none Switch to weight mode
WS<CR> ws_HML<CR> Request scale status
WZ<CR> none Zero the scale

13PC-802 Counting Scale User's Manual
Scale Status Byte H:
BIT: 7 6 5 4 3 2 1 0
0011XXXX
1: In motion
1: At zero
1: Under capacity
1: Tare active
Scale Status Byte M:
BIT: 7 6 5 4 3 2 1 0
0011XXXX
1: Negative
1: Over cap.
1: PROM checksum error
1: faulty calibration
Scale Status Byte L:
BIT: 7 6 5 4 3 2 1 0
0011000X
1: low battery
0: unused
0: unused
0: unused
Error Messages
The error messages you might see on the display are shown below.
rA Err RAM error - press the TARE key to acknowledge the error
ro Err ROM error - press the TARE key to acknowledge the error
EPr Err EEPROM error - press the TARE key to acknowledge the error
CAL Err Calibration error - perform calibration procedure to correct
------- Middles dashes on power up indicate the scale was not stable
or there was too much weight on the scale. Remove the weight
or the cause of unstable weight and press the ZERO key. If
condition persists try relocating scale and/or power down and
retry. If condition continues, contact your Avery Weigh-Tronix
representative.

14 PC-802 Counting Scale User's Manual

15PC-802 Counting Scale User's Manual

Weigh Bar®is a registered trademark
of Avery Weigh-Tronix and may be
registered in certain jurisdictions.
All brands and product names used
within this document are trademarks
or registered trademarks of their respective holders.
Avery Weigh-Tronix USA
1000 Armstrong Dr.
Fairmont, MN 56031 USA
Telephone: [phone]
Facsimile: 507-238-4195
e-mail: [email protected]
www.wtxweb.com
Avery Weigh-Tronix UK
Foundry Lane
Smethwick, West Midlands
England B66 2LP
Tel: [phone]
Fax: [phone]
Email: [email protected]
Web site:www.averyweigh-
tronix.com
Avery Weigh-Tronix Canada, ULC
217 Brunswick Boulevard
Pointe Claire, QC H9R 4R7 Canada
Telephone: [phone]
Toll free: 800-561-9461
Facsimile: 514-695-6820
www.weigh-tronix.ca