Avery Weigh-Tronix PC-905 User manual

PC-905 Counting Scale
PC-905
User Instructions
ENGLISH
43002-0016 Issue AB 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.
Trademarks and acknowledgements
Avery Weigh-Tronix, Avery Berkel, Dillon, NCI and Salter Brecknell are registered trademarks in certain
jurisdictions. All third party brands and product names used within this document are trademarks or
registered trademarks of their respective holders.
IMPORTANT
When programming or configuring the equipment you must ensure that you comply with all relevant
standards and legislation. The example settings given in this book may not be legal for trade with the
public.
Declarations of compliance
United States
This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15
of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when
the equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his own expense.
Canada
This digital apparatus does not exceed the Class A limits for radio noise emissions from digital apparatus set out in
the Radio Interference Regulations of the Canadian Department of Communications.
Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils
numériques de la Classe A prescrites dans le Règlement sur le brouillage radioélectrique edicté par le ministère des
Communications du Canada.

PC-905 Counting Scale User Instructions 3
page
Contents ......................................................................................................................... 3
Introduction..................................................................................................................... 5
Keyboard and Display .................................................................................................... 6
Scale Setup and Operation ............................................................................................ 8
Battery Power Option ............................................................................................... 9
Operation as a Scale .............................................................................................. 10
Operation as a Counting Scale .............................................................................. 11
Counting Using a Known Piece Weight.................................................................. 12
Counting Using Bulk Sampling ............................................................................... 13
Counting Using Dribble Sampling .......................................................................... 14
Using Reverse Sampling for Counting, Method 1 .................................................. 15
Using Reverse Sampling for Counting, Method 2 .................................................. 16
Recalling a Piece Weight ....................................................................................... 17
Using the BASE Key .............................................................................................. 18
Serial Communications................................................................................................. 19
Preset Print Formats .............................................................................................. 21
Error Messages ............................................................................................................ 31
Specifications ............................................................................................................... 32
Contents

4PC-905 Counting Scale User Instructions

5
1.1 Contents
This manual tells you how to operate the PC-905 high precision counting
scale. You can configure your scale for different options and sampling
methods. See the PC-905 Service Manual for details on configuration and
calibration. This scale also has an RS-232 I/O channel for communication
with appropriate remote devices.
The manual is divided into the following sections:
- Keyboard and Display (page 6)
- Scale Setup and Operation (page 8)
- Serial Communications (page 19)
- Error Messages (page 31)
Introduction
1

6PC-905 Counting Scale User Instructions
Keyboard and Display
Figure 2.1 shows the front panel of the PC-905. This is made up of the
keyboard and display.
Figure 2.1 PC-905 Front Panel
The numeric keypad on the right side of the front panel has two function
keys:
•CLEAR Lets you clear the displayed number, tare, or
piece weight. Press to clear the last display digit
during digit entry.
If you press the RCL/. key followed
by a numeric key, the PC-905
treats the first key press as a
decimal and not a recall request.
•RCL/. Use this to recall the last tare, piece weight,
sample size or to enter a decimal (only if a
numeric key is pressed first). See note at left.
Use the 0-9 numeric keypad for entering piece weight or tare values.
There are five keys below the display:
•COUNT/WEIGHT Toggles between displaying weight and count
when a piece weight is active.
•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.
•PIECE WEIGHT Lets you key in a known piece weight. Press this
key after entering a numeric value to accept it as
the current piece weight and make the count
mode active.
•BASE Toggles between the local and remote base.
Keyboard and Display
2

PC-905 Counting Scale User Instructions 7
There are three keys to the right of the display:
•SAMPLE Used to select a sample size and to initiate the
calculation of sample piece weight.
This key also functions as an ON/STANDBY key
for battery powered scales. Press the key to start
the scale. Press and hold this key for five
seconds to put the scale in standby mode. The
display will show SLEEP.
As long as AC is connected to the scale it will
power up where it left off unless the scale is
SEALED. When sealed it performs the full power
up count down and zero reset.
•TARE Press this key to tare the weight on the scale.
You can also press this after keying in a numeric
tare value to accept it and activate net weight
mode
•ZERO Zeroes the scale weight or count.
The display has seven alphanumeric characters for displaying numbers and
messages. Annunciators are built into the display to indicate the following
functions:
•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.
• LOCAL Annunciator indicates the local scale is active
•REMOTE Annunciator indicates the remote scale is active.
•LOBAT Annunciator indicates the battery has 1 or 2 hours
of battery life remaining, depending on battery
installed. See the battery information under 3.3 -
Battery Power Option (page 9). Recharge the
battery when this is displayed.
• STABLE Annunciator indicates weight on the scale is
stable.
• TARE Annunciator indicates a tare weight is in effect
and displayed weight is net weight.
•ZERO Annunciator indicates the scale is at center zero
weight.

8PC-905 Counting Scale User Instructions
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 - 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 a Known Piece Weight (page 12)
•3.7 - Counting Using Bulk Sampling (page 13)
•3.8 - Counting Using Dribble Sampling (page 14)
•3.9 - Using Reverse Sampling for Counting, Method 1 (page 15)
•3.10 - Using Reverse Sampling for Counting, Method 2 (page 16)
•3.11 - Recalling a Piece Weight (page 17)
•3.12 - Clearing a Piece Weight (page 17)
•3.13 - Recalling a Tare Weight (page 17)
•3.14 - Clearing a Tare Weight (page 17)
•3.15 - Using the CLEAR Key to Clear Numeric Entries (page 17)
•3.16 - Using the BASE Key (page 18)
3.1 Unpacking the Scale
Unpack the PC-905 and remove the shipping materials from around the
scale.
3.2 Installing the Scale
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 knurled locking rings.
The PC-905 comes with the AC transformer in place beneath the scale. Plug
the unit into a grounded 120VAC source.
If the battery option is installed, charge the unit for 16 hours before using the
scale for the first time.
Scale Setup and Operation
3

PC-905 Counting Scale User Instructions 9
3.3 Battery Power Option
3.3 Battery Power Option
The PC-905 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. Press the
SAMPLE key for five seconds to shut the scale off. You can set the battery
option to shutoff the scale automatically after a period of time. See the
Service Manual for this information.
Internal Battery If you ordered the internal battery, it will be installed in the unit prior to
shipping.
External Battery If you are going to use the external battery, remove the transformer 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.

10 PC-905 Counting Scale User Instructions
Scale Setup and Operation
3.4 Operation as a Scale
The PC-905 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.
Small words at the bottom of the display (LOBAT, STABLE, TARE, ZERO)
let you know when the battery (if installed) is low, when the scale is stable
(no motion), when a tare is in effect, and when the scale is at zero.
Follow these instructions for operating the PC-905 as a scale:
The scale will power up in the counting mode if a piece weight was active
when powered down.
1. For AC powered models, plug the unit into a grounded 120VAC source.
For battery and AC powered models, the unit will power up when
plugged into the outlet or the battery. If the unit is in SLEEP (standby)
mode, press the SAMPLE key. . .
If the display shows SLEEP while
powered on AC and not sealed, the
diagnostics test is skipped on
power up .
The scale performs an internal diagnostics test, zeroes the scale,
then displays the count or weight. The scale is in the weigh mode
when the weight annunciator is lit.
2. If necessary, 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 or PC and the weight is stable,
press PRINT to transmit data.
Formatted weight and count information is printed. The format is
selectable. See the Service Manual for information on print
formats.

PC-905 Counting Scale User Instructions 11
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:
• key in a known piece weight
• 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.
These are fully explained in their respective sections below along with step
by step instructions for counting using these methods. Sampling methods
were set up before you received your scale but they can be changed. See
the Service Manual.
Once a piece weight is established,
it remains active until another piece
weight is manually entered,
automatically calculated by a
sampling process, or the piece
weight is cleared by pressing CLR/.
and then the PIECE WEIGHT key.
General Counting Information
If the COUNT annunciator is lit, numbers on the display show the number of
pieces on the scale. If the WEIGHT annunciator is lit, the display shows the
weight of the items on the scale. Press the COUNT/WEIGHT key to switch
between these two.
If there is no piece weight, the scale will not go into count mode when you
press the COUNT/WEIGHT key.
After counting items, remove them and the display should return to zero. If
not, press the ZERO key.
The STABLE annunciator is controlled by the weight division setting and
STABLE setting in SCALE menu and does not necessarily reflect the
stability in the count mode.
You can key in a known tare weight on the numeric keypad and press the
TARE key. This enters the tare weight and the TARE indicator lights to
remind you that there is an active tare weight.
When you press the SAMPLE key the scale performs an auto-zero or tare.
A counting scale needs a minimum amount of weight to calculate counts with
accuracy. Avery Weigh-Tronix recommends the sample weight be a
minimum of 0.04% of scale capacity for 99% accuracy. The table below
shows the minimum sample weights recommended to guarantee the
accuracies listed. Actual minimum sample weight required is 0.02%.

12 PC-905 Counting Scale User Instructions
Scale Setup and Operation
3.6 Counting Using a Known Piece Weight
Sampling is just one way to get a piece weight and to count items. You can
also key in a known piece weight on the numeric keypad and press the
PIECE WEIGHT key. This enters the piece weight and calculates counts
based on that weight.
With the scale powered and showing 0weight, follow these example steps
for a part weighing .02478 pounds:
If you press the RCL/. key followed
by a numeric key, the 905 knows
you meant the first key press as a
decimal.
1. Press the RCL/. key, then press the numeric keys 0, 2, 4, 7, and 8,
then press the PIECE WEIGHT key (see note at left). . .
The piece weight is accepted and the scale changes to count
mode.
2. Place the items to be counted on the scale. . .
Count of the items is displayed.
3. Remove all items from the scale and repeat step 2 for all other similar
items needing to be counted.
4. To clear the piece weight and return to normal weighing mode, press
the CLEAR key and then the PIECE WEIGHT key. . .
The scale returns to weight mode.
5. For counting another item with a different known piece weight, repeat
steps 1-3.

PC-905 Counting Scale User Instructions 13
3.7 Counting Using Bulk Sampling
3.7 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 or key in a known tare weight and press the TARE key. This
can be done in count or weight mode.
1. In weight or count mode, repeatedly press the sample key until the
sample size you want is displayed or key in a sample size (up to
65,535) and press SAMPLE. . .
Your display may show ZEroing briefly. This occurs if it takes time
for the scale to find the Zero Reference. If a zero reference cannot
be acquired within 10 seconds due to excessive vibration, Abort
will be displayed. If this sampling error occurs, check to be sure the
scale is stable and start over at step #1. If all is OK, you will see the
following:
Important!
If there is no active piece weight,
the scale will not go into count
mode when you press the COUNT/
WEIGHT key.
Add 5 is displayed. 5 is the default sample size. The minimum
sample size can be configured to be 1, 2, 5, 10, 25, 50 or 100. See
the PC-905 Service Manual.
2. Place 5 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, 5will be
displayed and you can skip to step 4.
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.
The number XXX is the result of the scale rounding up, to the next
available sample size, from an actual number of pieces it has
calculated are needed to meet the required accuracy. For example:
If the scale determines that six pieces are needed to be added for
the sample weight to meet the minimum for the required accuracy,
the display will show the next larger sample size, 10 in this
example, and the display will show Add 10.
When you press the SAMPLE key,
the PC-905 performs an autozero
operation. So, if you have an empty
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 shown.
3. Add the requested samples to those already on the scale at the same
time. . .
StAndbY is displayed while the scale updates the piece weight. If
the sample meets the minimum accuracy, the count will be
displayed.
4. Add the items you wish to count to the scale. . .
Total count is displayed.
5. Remove the parts from the scale and add more of the same parts to
continue counting.
Press the COUNT/WEIGHT key to
toggle between count and weight
mode.
6. To clear the piece weight and return to normal weighing mode, press
the CLEAR key and then the PIECE WEIGHT key. . .
The scale returns to weight mode.

14 PC-905 Counting Scale User Instructions
Scale Setup and Operation
3.8 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.
If you have a container, place it on the scale and press the TARE key to tare
the container, or, if you know the container weight, key in the weight and
press the TARE key. This can be done in count or weight mode.
1. In weight or count mode, repeatedly press the sample key until the
sample size you want is displayed or key in a sample size (up to
65,535) and press SAMPLE. . .
Your display may show ZEroing briefly. This occurs if it takes time
for the scale to find the Zero Reference. If a zero reference cannot
be acquired within 10 seconds due to excessive vibration, Abort
will be displayed. If this sampling error occurs, check to be sure the
scale is stable and start over at step #1. If all is OK, you will see the
following:
Important!
If there is no active piece weight,
the scale will not go into count
mode when you press the COUNT/
WEIGHT key.
Add 5 is displayed. 5 is the default sample size. The minimum
sample size can be configured to be 1, 2, 5, 10, 25, 50 or 100. See
the PC-905 Service Manual.
2. Count 5 sample parts onto the scale, wait for the STABLE annunciator
to light and then press the SAMPLE key. . .
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, 5will be
displayed and you can skip to step 4.
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.
The number XXX is the result of the scale rounding up, to the next
available sample size, from an actual number of pieces it has
calculated are needed to meet the required accuracy. For example:
If the scale determines that six pieces are needed to be added for
the sample weight to meet the minimum for the required accuracy,
the display will show the next larger sample size, 10 in this
example, and the display will show Add 10.
When you press the SAMPLE key,
the PC-905 performs an autozero
operation. So, if you have an empty
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 shown.
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
displayed.
4. Add the items you wish to count to the scale. . .
Total count is displayed.
5. Remove the parts from the scale and add more of the same parts to
continue counting.
Press the COUNT/WEIGHT key to toggle between count and weight mode.

PC-905 Counting Scale User Instructions 15
3.9 Using Reverse Sampling for Counting, Method 1
3.9 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.
Method 1 is explained below, method 2 in the next section.
Method #1 (Default setting)
1. Place full container on the scale. (entering an accurate tare weight will
allow you to determine the number of parts in the container)
2. Press SAMPLE. . .
ADD XXX is displayed.
3. Remove an unknown number of parts from the container. Once stable
the scale will acknowledge that the weight is less then initial zero and
the message Add XXX will return.
4. Add the number of parts shown back into the container. If SAMPLE
TYPE is set to DRIBBLE mode, press the SAMPLE key.…
The scale will calculate the piece weight and display the number of
parts based on the net weight on the scale.
5. To begin reverse counting of parts, clear any entered tare weight,
place all the parts back into the container and press ZERO. As parts
are removed, the count of items removed is displayed as a negative
number.

16 PC-905 Counting Scale User Instructions
Scale Setup and Operation
3.10 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, method 2, 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.
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.
Method 2 is explained below, method 1 in the previous section.
Method 2 can be done with or without taring a container. Both ways are
explained below:
Method #2 - With a Tare
Weight
1. Enter a tare weight by keying in a known tare weight and pressing the
TARE key, or place an empty container on the scale and press the
TARE key.
2. Place the full container on the scale.
3. Press the SAMPLE key. . .
ADD XXX is displayed.
4. Remove the number of parts shown by the ADD XXX prompt. . .
The display will flash ADD XXX.
5. Press the SAMPLE key. . .
The display will show the number of parts remaining in the
container.
6. Place the parts that were sampled back into the container. . .
The total number of parts is displayed.
7. If you want to see positive counts as items are removed from the
scale, press the ZERO key. . .
The scale will clear the count and tare value and as parts are
removed from the scale, the display will show a positive number.
Method #2 - Without a Tare
Weight
1. Without a tare weight entered place full container on the scale.
2. Press the SAMPLE key. . .
ADD XXX is displayed.
3. Remove the number of parts shown by the ADD XXX prompt. . .
The display will flash ADD XXX.
4. Press the SAMPLE key. . .
The display will show the number of parts removed from the scale.
5. Keep removing parts to see the total number removed.
6. You can add more parts to the scale, then press the ZERO key to zero
the count and continue removing parts and counting what you
remove.

PC-905 Counting Scale User Instructions 17
3.11 Recalling a Piece Weight
3.11 Recalling a Piece Weight
The PC-905 lets you view the active piece weight by using the RCL/. key.
The active piece weight is one you have keyed in or one that has resulted
from doing a sample. This is useful if you want to record a piece weight for
a part. The next time you want to count that part you can key in the recorded
piece weight.
1. With the COUNT or WEIGHT annunciator lit, press the RCL/. key. . .
rCL is displayed. This stands for recall.
2. Press the PIECE WEIGHT key. . .
The active piece weight will be be displayed.
3. Press the COUNT/WEIGHT key. . .
Scale is in count mode with the active piece weight in effect.
3.12 Clearing a Piece Weight
You can clear the current piece weight by pressing the CLEAR key and then
the PIECE WEIGHT key. The scale returns to weight mode.
Without an active piece weight you cannot switch the scale to count mode.
3.13 Recalling a Tare Weight
The PC-905 can show the active tare weight in case you want to record it for
future use.
1. With the COUNT or WEIGHT annunciator lit, press the RCL key. . .
rCL is displayed. This stands for recall.
2. Press the TARE key. . .
The last active tare weight will be be displayed.
3. Press the COUNT/WEIGHT key. . .
Scale is in weight mode with the active tare weight in effect.
3.14 Clearing a Tare Weight
To clear the current tare weight, press the TARE key with no weight on the
scale or press the CLEAR key followed by the TARE key. The active tare
will be deleted.
3.15 Using the CLEAR Key to Clear Numeric Entries
If you miskey a number, press the CLEAR key as many times as necessary,
then continue keying in your number as usual.

18 PC-905 Counting Scale User Instructions
Scale Setup and Operation
3.16 Using the BASE Key
Press the BASE key to switch between using the local scale and a remote
scale base. This assumes you have a remote base option installed.
If Automatic Base Switching is enabled (see the Service Manual for
instructions on enabling this function), use the local base for all sampling and
when the sampling is done, the remote base becomes the active scale
automatically.
If you do not have auto base switching enabled, you can do your sampling
on the local base, press the BASE key and place items on the remote scale
for counting.
You can tell which scale is active by the LOCAL and REMOTE annunciators
on the display.
Below is an example of using the BASE key with bulk sampling and auto
base switching enabled:
1. With the remote option installed and the scale in weight mode, press
the SAMPLE key. . .
You can press the SAMPLE key
again to change the sample size.
ADD XXX, the sample size, is displayed. See the note at left.
2. Place the indicated (XXX) number of parts on the scale. . .
The scale calculates the piece weight, displays the count, the
REMOTE annunciator lights and the remote scale becomes the
active scale.
3. Place the items to be counted on the remote scale. . .
Count is displayed.
Additional notes:
You can tare containers on the remote scale by using the TARE key.
Sampling is always done on the local scale.

PC-905 Counting Scale User Instructions 19
This section covers the serial communications capabilities of the PC-905. In
this section you will find:
Default serial settings are:
9600 Baud, 8 databits, No parity,
and 1 stop bit
•4.1 - Cable Pinouts (page 19)
•4.2 - Preset Print Formats (page 21)
•- Imp Printer Formats (page 21)
•- Dymo Label Writer Setra 300 Formats (page 24)
•- Zebra 2844 Printer Formats (page 25)
•- PC Protocol (page 26)
•- NCI Protocol (page 28)
•- Broadcast Protocol (page 30)
4.1 Cable Pinouts
The RS-232 serial port connection at the rear of the scale is shown in Figure
4.1.
Figure 4.1 PC-905 Back Panel
Serial Communications
4

20 PC-905 Counting Scale User Instructions
Serial Communications
The functional pinout is as follows:
The scale has a remote base option. If this is installed, the connector will
show up in the position shown in Figure 4.1. If the remote base is analog the
connector will be a DB-9 male. If the remote base is digital (QDT), the
connector will be DB-9 female. The pinouts for each are shown in the table
below.
DB-9F Scale Serial I/O Connector
Pin Signal Description
1 Reserved
2TXD
3RXD
4 Reserved
5 SIG GND
6 Reserved
7 Reserved
8 Reserved
9+5V
DB-9M Remote Analog Base Input DB-9F Remote Digital Base Input
Pin Analog Signal Desc Pin Digital Signal Desc
1 - SIGNAL 1 +7.5 VDC
2 + SIGNAL 2 REC B
3 + EXCITATION 3 XMT B
4 - EXCITATION 4 N/C
5 + SENSE 5 SIG GND
6 N/C 6 N/C
7 N/C 7 XMT A
8 - SENSE 8 REC A
9 SHIELD 9 N/C