AVA WEIGH 334FS500TW User manual

05/2020
334FS500TW
500 lb.
Digital Receiving Scale
w/ Tower Display
USER MANUAL

• Risk of electric shock: disconnect all power sources before making cable connections to the
floor scale platform or indicator.
• For use in dry environments only.
• The floor scale platform is very heavy. Use appropriate lift equipment.
• Scale platform must be installed on a foundation capable of safely supporting the weight of
the floor scale plus the weight of the maximum load.
• Do not operate in hazardous areas.
• Read & understand all operating instructions before using this product
• Keep this manual for future reference.
• Record the weight shortly after placing a load on the platform. After extended periods,
the load cell’s output signal may result in a less accurate reading.
• Avoid extended exposure to extreme heat or cold. Optimum operation is at normal
room temperature. See operating temperature range in the specifications table. Allow
the scale to acclimate to room temperature before using.
• Allow sufficient warm up time. Turn the scale on and allow up to 2 minutes for internal
components to stabilize before weighing.
• Electronic scales are precision instruments. Do not operate near cell phones, radios,
computers or other electronic devices that emit radio frequencies that may cause
unstable readings.
• 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 this 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 their own expense.
• Avoid using in heavy vibration or heavy airflow conditions. This also applies when the
floor scale is integrated into conveying systems.
GENERAL & SAFETY INFORMATION
TABLE OF CONTENTS
1.
General & Safety Informaon.................................................................................1
Specicaons..............................................................................................................2
Unpacking & Setup....................................................................................................3
Display & Keypad.......................................................................................................4
Operaon & Sengs ................................................................................................7
User Parameters.........................................................................................................9
RS232/USB Communicaons ............................................................................. 11
Troubleshoong ...................................................................................................... 14

SPECIFICATIONS
2.
334FS500TW
MAX CAPACITY 500 lb. / 250kg
MIN CAPACITY 2 lb. / 1kg
SCALE DIVISION 0.1 lb. / 0.05kg
PLATFORM SIZE 15.75” x 19.68” (400 x 500mm)
TOWER HEIGHT 26” (660mm)
DISPLAY 1” High LCD Display
OPERATING TEMPERATURE 41 - 105°F (5 - 40°C)
HUMIDITY RANGE <85% Relave Humidity, Non-Condensing
POWER SUPPLY Baeries: Internal, Lead-Acid Rechargeable 6V 4Ah
AC Adapter: 12V/500mA
CALIBRATION External Calibraon Through the Keypad
COMMUNICATION PORT Bi-direconal RS232, USB (Virtual RS232)

1. Take all the contents out of the
box. Thread the load cell cable on
platform base through the pole.
(Fig. 1)
2. Remove the (4) screws on rear side
of the indicator, then disassemble
the locking device on the indicator
bracket. (Fig. 2)
3. Insert the cable through the
bracket, then lay the bracket on the
post. (Fig. 3)
4. Position the bracket in the slot
to the direction desired. Lock the
bracket. (Fig. 4)
5. Place the indicator on the bracket
and secure it with (4) screws. (Fig. 5)
6. Plug the female connector from
load cell to the male socket on
indicator. (Fig. 6)
NOTE: The connector is a
snap-in connector. DO NOT
screw the female into the male
as a twisting force will cause inside
wires to break.
7. Remove the platter from the
platform base. (Fig. 7)
8. Fix the pole onto the lower base
frame with (4) M6 outer hexagonal
bolts and tighten. (Fig. 8)
9. Adjust nuts on bottom to
horizontally align scale. (Fig. 9)
10.Fix the protection bar onto the
platter with (4) M5x35 socket head
cap screws and washers, tighten
with allen wrench. (Fig. 10)
11.Put the platter back on the scale
base (Fig. 11)
12.The scale is now ready to use.
• Phillips Head Screwdriver
• Allen Wrench (Included)
UNPACKING & SETUP
3.
TOOLS REQUIRED
UNPACKING
& ASSEMBLY
Fig. 1 Fig. 2
Fig. 3
Fig. 4
Fig. 5 Fig. 6
Fig. 7
Fig. 10 Fig. 11
Fig. 8 Fig. 9

4.
DISPLAY CHARACTERS
SYMBOL DIGIT SYMBOL DIGIT SYMBOL DIGIT
0 A N
1 B O
2 C P
3 D Q
4 E R
5 F S
6 G T
7 H U
8 I V
9 J W
K X
L Y
M Z

INDICATOR DISPLAY
5.
ON/OFF
ZERO TARE HOLD
PRINT
COUNT
UNIT
ACC
TOTAL
334FS500TW
Capacity: 500lb x 0.1lb / 250kg x 0.05kg
• Kg - Indicates when the scale is weighing in Kilograms.
• Lb - Indicates when the scale is weighing in Pounds.
• - Indicates when the scale reaches zero.
• - Indicates when the scale reading is stable.
• NET - Indicates when the Net weight is displayed, Tare weight is at zero.
• Hold - Indicates when the scale has held the weight reading shown on the display.
• TOTAL - Indicates when the scale is displaying an accumulated value.
• PCS - Indicates when the scale is in counng mode.

FUNCTION KEYS
6.
NOTE: Normally, the 2nd funcon of a key needs to be pressed down for > 3 sec. to be acvated.
KEY MODE FUNCTION
Weighing Mode
Turn the scale on or o.
Zero the scale if the display dris from zero.
Parameter or Calibraon Mode Exits current mode.
Weighing Mode Tares the scale, if necessary.
Parameter or Calibraon Mode Conrms the input data or conrms the operaon.
Weighing Mode
Acvates accumulaon funcon.
Reviews the total accumulated value.
Weighing Mode
Toggles the weighing unit between kg and lb.
Enters counng mode.
Parameter or Calibraon Mode Increases the digit in the ashing data entry posion by 1.
Weighing Mode
Prints the weight details to a PC or printer.
Locks the reading even if object to be weighed is moving.
Parameter or Calibraon Mode Shis the ashing data entry posion from le to right.
Weighing Mode Enter Parameter Seng Mode.
Weighing Mode Enter Calibraon Mode.

1. Power on the scale by pressing the ON/OFF key.
2. If the display stabilizes but doesn’t show zero, press the ZERO key to set new zero point.
3. Place the objects on the scale platform and read the weight on the indicator.
Note: Objects should be placed at the center of the platform. Corner or side loading heavy
objects may risk overloading an individual load cell and damage the scale.
4. To change the weight unit of measure, press the UNIT/COUNT key.
5. To send data to another device via the serial port, press the PRINT/HOLD key.
6. Power off the scale by pressing the ON/OFF key for 4 seconds.
1. Zero the scale as described above.
2. Place an empty container on the platform, press the TARE key. The display will return to zero,
eliminating the weight of the container. NET will be lit on the display.
3. Place the material or object to be weighed in the container. The net weight will be displayed.
4. To exit tare mode, remove all weight from the scale. The display will show a negative weight. Press
the TARE key to return the display to zero.
1. In normal weighing mode, press and hold the UNIT/COUNT key for 4 seconds to enter Count mode.
2. When the scale displays , place the samples on the scale and press the TARE key to confirm.
3. will flash, then scale displays , use the ↑ and → keys to input the quantity of samples,
press the TARE key to confirm. If any error occurs, the scale will display and will require
the quantity to be input again.
4. Put more parts on the scale for counting, the display will show the number of parts (pcs).
5. Press and hold the UNIT/COUNT key to return to normal weighing.
OPERATIONS & SETTINGS
7.
NORMAL WEIGHING MODE
YES NO NO
TARE FUNCTION
COUNTING
1. If the display does not show 0, and there is no object on the platform, press the ZERO key to zero the
reading.
• The zero function is unavailable when the displayed reading is out of the zero range and the indicator
will show the error message or meaning the scale is over or under the zero range.
ZERO FUNCTION
1. Press and hold the PRINT/HOLD key for 4 seconds while scale is under load.
2. HOLD will be displayed and the weight will remain saved after unloading the scale.
3. To deactivate the Hold function, press and hold the PRINT/HOLD key for 4 seconds.
HOLD FUNCTION
The Hold function is used if you would like to hold the results on the display after the weight/load
has been removed from the scale.

Accumulation can be used in both weighing and counting modes.
Before calibrating the scale, you should ensure that you have a known KG weight for calibration.
8.
ACCUMULATION MODE
CALIBRATION
1. In normal weighing or counting mode, when reading is stable, press the ACC/TOTAL key to
accumulate the current weight or quantity into memory, TOTAL will be blink on and off in 2
seconds.
2. Remove the weight, allowing the scale to return to zero and put a second weight on. Press the
ACC/TOTAL key to display the new total.
3. To review the accumulated total, press and hold the ACC/TOTAL key for 4 seconds. The scale
will display the total weight or quantity, TOTAL will be displayed. After 2 seconds, TOTAL will
turn off and the scale will go back to normal weighing or counting mode.
NOTE: In all cases, the scale must return to zero or a negative number before another sample
can be added to memory. More poduct can then be added by pressing the ACC/TOTAL key. This
can continue until the total weight or quantity exceeds .
1. When in normal weighing mode with the scale at zero, press and hold down the ZERO and TARE
keys to enter Calibration mode.
2. When the indicator shows , press the TARE key to confirm and go to the next step,
or press the ZERO key to exit Calibration mode.
3. Scale will display the max capacity, then display the division. Press the TARE key to confirm and
go to the next step, or press the ZERO key to exit Calibration mode.
4. When is displayed, the scale will begin to calibrate the zero-point of the scale. Remove
all weight from the scale. Press the TARE key to confirm, or the ZERO key to exit Calibration
mode. After receiving the reasonable zero-point data, the scale will go to the next step
automatically.
5. Now the scale displays , then displays a defaulted standard weight of 50%FS. Load
12.5%-100%FS weight on the scale, and use the ↑ and → keys to input the loaded weight.
Press the TARE key to confirm the input and go to the next step. If an error occured, the scale
will display and return back to step 4 for re-calibration.
6. When the scale displays , then displays a default standard weight of 100% FS. Load
25%-100%FS (this must be equal or larger than the weight from the ) weight on the
scale. Use the ↑ and → keys to input the standard weight’s value. Press the TARE key to confirm.
The indicator will flash the input weight and go to the next step automatically. If an error
occurred, the scale will display and return back to step 4 for re-calibration.
7. When is shown again, the scale will calibrate the zero-point again. Remove any weight
from the scale, press the TARE key to confirm, and back to the normal weighing mode. If an
error occurred in calibration, the scale will display and return back to step 4 for re-
calibration.

9.
PARAMETER X/XY REMARK DEFAULT
P1.xy
Auto-o Time 00-15 00 = No Auto-O
01-15 = Minutes Auto-O Time 05
P2.xy
Hold/Print Funcon 00-02
00 = Only Hold Funcon
01 = Only Print Funcon
02 = Both Funcons (<3 sec = Print, >3 sec = Hold)
02
P3.xy
Hold Funcon 0-50
0 = Disable Hold Funcon
1 = Hold Larger Weight Reading
2-50 = Hold reading when variety is within ±2-50d,
auto release Hold funcon when weight is <10d
and auto-hold new stable weight (> 10d)
02
P4.x
RS232 & USB Funcon 0-7
0 = No RS232 and USB
1 = Press PRINT key to output display data when
scale is stable
2 = Press PRINT key to output gross, tare, and net
weight when scale becomes stable
3 = Connuously outputs display data
4 = Connuously outputs gross, tare, and net weight
5 = Outputs display data one me when scale is stable
6 = Outputs gross, tare, and net weight one me
when scale becomes stable
7 = Bi-direconal communicaon
2
P5.x
Communicaon Baud Rate
0-4
0 = 1200bps
1 = 2400bps
2 = 4800bps
3 = 9600bps
4 = 19200bps
3
P6.x
Communicaon Format 0-2 0 = 8N1 1 = 7O1 2 = 7E1 0
P7.xy
Resoluon 00-32
00 = 500 08 = 2400 16 = 7500 24 = 35000
01 = 600 09 = 2500 17 = 8000 25 = 40000
02 = 750 10 = 3000 18 = 10000 26 = 50000
03 = 800 11 = 3500 19 = 12000 27 = 60000
04 = 1000 12 = 4000 20 = 15000 28 = 70000
05 = 1200 13 = 5000 21 = 20000 29 = 75000
06 = 1500 14 = 6000 22 = 25000 30 = 80000
07 = 2000 15 = 7000 23 = 30000 31 = 100000
32 = Factory Preset N (0<N<1000000)
10
USER PARAMETERS
1. When the scale is in normal weighing mode, press and hold the ZERO and UNIT/COUNT keys
for 3 seconds until is shown on the display.
2. In the Setup mode, press the ↑ key to change the flashing digits, press the → key to shift the
flashing data entry position from left to right, and press the TARE key to confirm and move to
the next parameter setting. Press the ZERO key to exit the Setup mode.
PARAMETERS SETTING SUMMARY

10.
PARAMETER X/XY REMARK DEFAULT
P8.x
Division Select 0-2 0 = 1 1 = 2 2 = 5 2
P9.x
Decimal Point in Calibraon 0-5
0 = x1
1 = x0.1
2 = x0.01
3 = x0.001
4 = x0.0001
5 = 10 /19 /15
2
P10.x
Calibraon Unit 0-1 0 = kg
1 = lb 0
P11.x
Weighing Units Enabled 0-6
0 = only kg
1 = only lb
2 = only lb:oz
3 = kg or lb
4 = kg or lb:oz
5 = lb or lb:oz
6 = kg, lb, or lb:oz
3
P12.x
Power-on Zero-point Range
0-7
0 = Calibraon zero-point ±1%FS
1 = Calibraon zero-point ±2%FS
2 = Calibraon zero-point ±5%FS
3 = Calibraon zero-point ±10%FS
4 = Calibraon zero-point ±20%FS
5 = Calibraon zero-point ±50%FS
6 = Calibraon zero-point ±100%FS
7 = No limitaon
7
P13.x
Zero Range for ZERO Key 0-9
0 = Power-on zero-point ±1%FS
1 = Power-on zero-point ±2%FS
2 = Power-on zero-point ±3%FS
3 = Power-on zero-point ±4%FS
4 = Power-on zero-point ±5%FS
5 = Power-on zero-point ±10%FS
6 = Power-on zero-point ±20%FS
7 = Power-on zero-point ±50%FS
8 = Power-on zero-point ±100%FS
9 = No limitaon
6
P14.x
Data as Current Power-on
Zero Point When Weight
Signal IS IN Power-on
Zero-point Range
0-2
0 = Current weight
1 = Calibraon zero-point
2 = Switch-o zero-point
0
P15.x
Data as Current Power-on
Zero Point When Weight
Signal IS NOT IN Power-on
Zero-point Range
0-3
0 = Current weight
1 = Calibraon zero-point
2 = Switch-o zero-point
3 = Connuous display
3
P16.x
Zero Tracking Range 0-8
0 = 0d, No Tracking
1 = ±0.25d 2 = ±0.5d 3 = ±1d 4 = ±1.5d
5 = ±2d 6 = ±3d 7 = ±4d 8 = ±5d
6
P17.x
Data Filter Intensity 0-3 0 = Very Weak 1 = Weak 2 = Middle 3 = Strong 2

11.
PARAMETER X/XY REMARK DEFAULT
P18.x
Check Weight Stability Range 0-2
0 = ±0.5d 1 = ±1d 2 = ±1.5d 3 = ±2d
4 = ±3d 5 = ±4d 6 = ±5d 7 = ±6d
8 = ±7d 9 = ±8d
1
P19.x
Overload Limit Range 0-9
0 = FS+0d 1 = FS+9d 2 = 101%FS 3 = 102%FS
4 = 103%FS 5 = 110%FS 6 = 120%FS 7 = 150%FS
8 = 200%FS 9 = No Limitation
1
P20.x
Backlight ON/OFF Mode 0-2
0 = Always OFF
1 = Always ON
2 = Auto ON/OFF
Auto OFF when scale is stable
with no key operaon for 10 seconds.
Auto ON when scale is unstable
and there is key operaon
2
P21.x
LCD Contrast Level 0-4
0 = Very Low
1 = Low
2 = Medium
3 = High
4 = Very High
3
SCALE CABLE HOST
DB9 Female DB9 Male DB9 Female DB9 Male
PIN2 TXD 2 2 PIN2 RXD
PIN3 RXD 3 3 PIN3 TXD
PIN5 GND 5 5 PIN5 GND
PIN4 DSR 4 4 PIN4 DTR
PIN6 DTR 6 6 PIN6 DSR
PIN7 CTS 7 7 PIN7 RTS
PIN8 RTS 8 8 PIN8 CTS
PIN1 NC 1 1 PIN1 NC
PIN9 NC 9 9 PIN9
RS232/USB COMMUNICATIONS
RS232 CONNECTION BETWEEN SCALE & HOST

12.
When Parameter P4.x in section 7 is set to 0
No RS232 and USB function. It will not transmit or receive any data although the scale is equipped
with RS232 or USB. The RS232 and USB function can be only activated when scale is in normal
weighing mode.
When Parameter P4.x in section 7 is set to 1
Output the current displayed data when the PRINT/HOLD key is pressed, and it does not receive
any data. The output format is as below:
<LF>< reading, symbol, decimal point, weight unit><CR><EXT>
When Parameter P4.x in section 7 is set to 2
Output displayed gross, tare, and net weight when the PRINT/HOLD key is pressed, and it does not
receive any data. The output format is as below:
<LF>< Gross: Weight, symbol, decimal point, weight unit><CR><EXT>
<LF>< TARE: Weight, symbol, decimal point, weight unit><CR><EXT>
<LF>< Net: Weight, symbol, decimal point, weight unit><CR><EXT>
The number of bytes used:
Weight reading ........... 7 bytes
Symbol ...................1 byte
Decimal point..............1 byte
Weight unit...........2 or 4 bytes
When Parameter P4.x in section 7 is set to 3
Continuous output data when reading is stable, and it does not receive any data. The output format
is same as P4.1.
When Parameter P4.x in section 7 is set to 4
Continuous output gross, tare and net weight when reading is stable, and it does not receive any
data. The output format is same as P4.2.
When Parameter P4.x in section 7 is set to 5
Output displayed data one time when scale is stable, and it does not receive any data. The output
format is same as P4.1.
When Parameter P4.x in section 7 is set to 6
Output gross, tare and net weight one time when scale is stable, and it does not receive any data.
The output format is same as P4.2.
When Parameter P4.x in section 7 is set to 7
1. The baud rate and data format is fixed as per P5 and P6 setting. Responses to serial commands
will be immediate, or within one weight measure cycle of the scale. One second should be more
than adequate for use as a time-out value by remote (controlling) device.
2. The length of the weight field will be 7 digit weight data, one for minus sign, one for decimal
point, two for measure unit (e.g. “lb”, “kg”). If the unit is lb:oz, another two for “lb” and one for a
space (<sp>) after lb. Units of measure abbreviations are always lower case.
3. If the weight is overcapacity, the scale will return nine ‘^’ characters (the field of symbol, decimal
point, weight data is filled by ‘^’).
a) If the weight is under capacity, it will return nine ‘_’ characters (the field of symbol, decimal
point, and weight data is filled by ‘_’).
b) If the zero point is error, it will return nine ‘_’ characters.
4. The character will be ‘-’ for negative weight or a space character for positive weight. Symbol,
follows after the first digit.
5. Useless leading zero before digits is suppressed.

13.
KEY TO SYMBOLS USED
<LF> Line Feed character (hex 0AH)
<CR> Carriage Return character (hex 0DH)
<ETX> End of Text character (hex 03)
<SP> Space (hex 20H)
H1H2H3 Three status bytes. Refer to Table1 for definition.
<p> Polarity character including minus sign for negative weight
and a space character for positive weight
W1-W7 Weight data
<dp> Decimal point
U1U2 Measure units, kg, lb
Command: W<CR> (57h 0dh)
Response:
1. <LF>^^^^^^u1u2<CR>< LF>H1H2H3<CR><ETX>---over capacity
2. <LF>______u1u2<CR><LF> H1H2H3 <CR><ETX>---under capacity
3. <LF>---------u1u2<CR><LF> H1H2H3<CR><ETX>---zero-point error
4. < L F > < p > w 1 w 2 w 3 w 4 w 5 w 6 < d p > w 7 u 1 u 2 < C R > < L F > H 1 H 2 H 3 < C R >
<ETX> ---Scale is stable, and the current weight unit is kg or lb. With or without decimal point
and the position is as per the P9 setting and current unit.
Command: S<CR> (53h 0dh)
Response: <LF> H1H2H3<CR><ETX>
Command: Z<CR> (5ah 0dh)
Response: ZERO function is activated and it returns to current scale status.
Just like pressing ZERO key: <LF> H1H2H3<CR><ETX>
If ZERO function cannot be activated, it will return to current scale status.
Command: T<CR> (54h 0dh)
Response: TARE function is activated and it returns to current scale status.
Just like pressing TARE key: <LF> H1H2H3<CR><ETX>
If TARE function cannot be activated, it will return to current scale status.
Command: U<CR> (55h 0dh)
Response: Changes units of measure and return scale status with new units.
Just like pressing UNIT key: <LF>u1u2<CR><LF> H1H2H3<CR><ETX>
The new measure unit should be allowed to use as per P11 setting.
Command: X<CR> (58h 0dh)
Response: Powers off the scale, just like pressing the ON/OFF key.
Command: All Others
Response: Unrecognized command: <LF>?<CR><ETX>

SYMPTOM PROBABLE CAUSE
Zero point is OVER the seng range
Zero point is BELOW the seng range
ADC is OVER maximum range
ADC is BELOW minimum range
Overload
Calibraon error
Voltage of baeries or input power is below 5.6V
14.
TROUBLESHOOTING
STATUS BITS DEFINITIONS
BIT Byte 1 (H1) Byte 2 (H2) Byte 3 (H3)
0
0 = Stable 0 = Not Under Capacity
01 = Normal Work Mode
10 = Hold Work Mode
00 = Not Dene
11 = Not Dene
1 = Not Stable 1 = Under Capacity
1
0 = Not at Zero Point 0 = Not Over Capacity
1 = At Zero Point 1 = Over Capacity
2Always 0 Always 0
0 = Gross Weight
1 = Net Weight
3Always 0 Always 0 Always 0
4 Always 1 Always 1 Always 1
5Always 1 Always 1 Always 1
6Always 0 Always 1 Always 0
7Parity Parity Parity