USA Measurements US-731S User manual

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US-731S WEIGHING INDICATOR
Operating Manual - Version 1.00

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Contents
Chapter 1 Introduction ..................................................................................... 3
Chapter 2 Specifications ................................................................................... 4
Chapter 3 Function diagram ............................................................................ 5
Chapter 4 Operation ......................................................................................... 7
4.1 keys ......................................................................................................... 7
4.2 Battery using .......................................................................................... 7
4.3 Basic operation ...................................................................................... 8
4.4 Parameters set ....................................................................................... 9
4.5 Calibration ........................................................................................... 11
4.6 Error code ............................................................................................ 11
Chapter 5 Communication Interface ............................................................. 12
5.1 RS232 serial port communication ...................................................... 12
5.2 Load cell connection ( 5pin Air plug) ................................................ 13
Chapter 6 Maintenance and precautions ...................................................... 14

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Chapter 1 Introduction
US-731S weighing indicator comes standard with weighing functions
to total the weight, change from lb or kg, and our animal weighing
mode. The US-731S will include our RS232 port for connecting to the
computer or printer. The low power model will cut off the power when
the battery is too low in order to protect the indicator. US-731S can
power up to four 350 ohm load cells to be used with a variety of
different scales. Finally, the US-731S indicator includes our sleep
function to help save power on the battery when the indicator is not in
use.

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Chapter 2 Specifications
Parameter Settings:
1 Model: US-731S
2 Accuracy: Grade III, n=3000
3 Display: 6 button bright led, one inch digita
4 A/D conversion parameters: sigma delta, 24bit, 10 times / sec
5 Input span: -16mV ~ 18mV
6 Keyboard: 6 thin film button
7 Supply: DC12V, 1A
8 Battery: 7.4V/4AH lithium battery
9 Battery working time: 40 hours (continuous use)
10 Communication interface: RS232 output
11 Working / storage temperature: 0 ~ 40℃ / -25℃ ~ 55℃
12 Weight: Can be used in lb or kg

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Chapter 3 Function diagram
(figure 3-1-1 ) Function diagram of front view
Power on/off
Zero
Tare
Function
Clear
Enter

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(figure 3-1-2 ) Function diagram of back view
Battery cover
Load cell
COM
RS232/485
Power

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Chapter 4 Operation
4.1 keys
key
function
Second function
Set function
Long press enter function
increase,move
right
Short press
increase
Clear
quit
quit
Enter
Tare
increase
increase
Zero
Power on/off
4.2 Battery using
The battery supply the indicator , and can work continuously for about 50
hours.
When low power, the light indicating low power will turn on, it is time
to charge, if not, the indicator will be powered off in 30 minutes. This time
you must charge it, or it can not work.
When charging, no need to power on the indicator.
When working using battery, please charge it when the low power indicating
light on, or the indicator will power off after warning once low power to protect
the battery. If need to work continually, must charge it.
First time to use ,please charge it to be full.
The light is red when charging, turn green when the battery is full, no

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need to charge continually to use.
If not use the indicator for a long time, please charge it every three
months.
If the battery is found to be full of dissatisfaction or can only be used
for a short time even if full of power after being used for a long time, please
replace the new battery according to the specification of the battery.
4.3 Basic operation
4.3.1 Power on/off
Press the power on/off key to power on.
The indicator will self-checking after power on, and enter the state of
weighing.it can zero auto, and the zero light will be lighten.
If the indicator power off auto after flashing display “Lo bat”,please
charge it or plug in the supply to use continually.
Press the power on/off key to power off.
4.3.2 Over capacity warning
Please do not put the weight more than the max capacity on the scale, when
display“--O L--” and beep, please take down the weight immediately to
avoid the load cell damaged.
4.3.3 Zero Scale
When display non zero but no goods on the scale platform, press the key
zero to zero the scale.
This function is not valid when the display weight is outside of the zero
range.（default 2%）。
4.3.4 Tare Scale
Put on the weight, when stable light is lighten, press the key “T” to
tare the scale, the net light is lighten, put on the weight continually,
display net weight.
Press the key “C” to Clear the tare weight.

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4.4 Parameters set
In weighing state , long press F key to turn to function setting
state, press T key to page up or page down, press to confirm,
here start to set parameter, displaying first function P0. PWR
Press T key to page up to select other function, and press
to confirm the selected function. Here set the value using the T key,
press to confirm the value, press C key to quit. Such as: when
display “P0. PWR”,press , here display“SLEEP”,press
to confirm，and press T to select， press C to quit, the indicator
turns to weighing state.

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Function menu
P0.PWR
（power）
SLEEP
SLP ON
SLP OFF
BEEP
BP OFF
（OFF Alarm）default
BP OK
（OK Alarm）
BP NG
（Not OK Alarm）
BP LO
（Low Alarm）
BP HI
（High Alarm）
P1.UNIT
UT KG
UT G
UT LB
P2.CHK（check）
HI(
High
)
LOW
（Low）
P3.UART(commu
nication)
B 9600(
baud rate
)
FORM 1
FORM 2
FORM 3
P4.SDLY(commu
nication delay)
SD05(
delay time
)
P5.TEECH(weighi
ng parameters )
password
P1 REF
A2N 0(zero trace range)
0-AUTO(auto zero range)
0-RANG(push button zero range)
FILTER
P2.CAL
SIG RA(
single
)
DUA IN(
double
)
DECI(
decimal
)
INC (increment)
CAP(
capacity
)
CAL(
calibration
)
P3.PRO
TRI()
COUNT(
ADC code
)
RESET(Load Factory Default Values)