Longtec TR700 User manual

TR700 Instruction Manual
I
INSTRUCTION MANUAL
V01.14
LONGTEC
TR700
DIGITAL LOADCELL TRANSMITTER

TR700 Instruction Manual
II
Note：
Observe the instruction manual carefully before using the weighing indicator for the
first time, where you can find answers for many questions existing in the site
operation.
Check whether the other accessories of the weighing system match.
Avoid being exposed in direct sun shine, splashing of water and physical shocks.
Equip with the installation and repairing tools as possible: the mini-type minus screw
driver, digital multimeter, load cell simulator (mV signal generator).
©2010 LONGTEC Company Ltd.All proprietary rights are reserved.

TR700 Instruction Manual
III
CONTENT
1. GENERAL INSTRUCTION ..............................................................................................................................1
1.1. INSTRUCTION.................................................................................................................................................1
2. TECHNICAL PARAMETERS ..........................................................................................................................2
2.1. GENERAL SPECIFICATIONS.............................................................................................................................2
2.2. DIGITAL .........................................................................................................................................................2
2.3. ANALOG ........................................................................................................................................................2
3. INSTALLATION AND CONNECTION...........................................................................................................3
3.1 CAUTION .......................................................................................................................................................3
3.2 DIMENSIONS ..................................................................................................................................................3
3.3 WIRE CONNECTION AND INTERFACES............................................................................................................4
3.4 DISPLAY PANEL..............................................................................................................................................6
4. BASIC OPERATION DIAGRAM.....................................................................................................................8
4.1 BLOCK DIAGRAM ..........................................................................................................................................8
4.2 TR700 OPERATION FLOW CHART ..................................................................................................................9
4.3 TR700 FUNCTION TREE...............................................................................................................................10
5. GENERAL FUNCTION SETTING ................................................................................................................11
5.1. STEPS...........................................................................................................................................................11
5.2. FUNCTION TABLE.........................................................................................................................................12
6. COMMUNICATION PARAMETERSAND COMMUNICATION PROTOCOL......................................14
6.1. RS232/RS485 COMMUNICATION SELECTIONS.............................................................................................14
6.2. COMMUNICATION PARAMETER SETTING OF SERIAL INTERFACE 1................................................................15
6.3. LIST OF COMMUNICATION PARAMETERS OF SERIAL INTERFACE 1................................................................16
6.4. COMMUNICATION PROTOCOL OF SERIAL INTERFACE 1 ................................................................................16
6.4.1. Zhimei Protocol..................................................................................................................................16
6.4.2. Modbus Protocol.................................................................................................................................18
6.4.3. Longtec Protocol.................................................................................................................................24
7. CALIBRATION OF THE METER .................................................................................................................39
7.1. SIGNIFICANCE OF THE CALIBRATION............................................................................................................40
7.2. OPERATION OF THE CALIBRATION................................................................................................................41
7.2.1. Steps ...................................................................................................................................................41
7.2.2. Calibration in Kind.............................................................................................................................42
7.2.3. Digital Calibration..............................................................................................................................44
7.2.4. Modification of the Calibration Coefficient .......................................................................................46
7.3. CALDRAWING ............................................................................................................................................46
7.4. PARAMETER LIST OF CALIBRATION IN KIND ................................................................................................47
7.5. PARAMETER LIST OF DIGITAL CALIBRATION................................................................................................47
7.6. REMINDERS OF CALIBRATION ERROR ..........................................................................................................48

TR700 Instruction Manual
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8. DIAGNOSIS FUNCTION ................................................................................................................................49
8.1. OPERATION PROCEDURE OF DIAGNOSIS FUNCTION .....................................................................................49
8.2. LIST OF DIAGNOSIS FUNCTION.....................................................................................................................50
8.3. DESCRIPTION OF DIAGNOSIS FUNCTION ......................................................................................................50
8.3.1. Display of the Mill volt Value.............................................................................................................50
8.3.2. Key-press Testing ...............................................................................................................................50
8.3.3. Display Testing...................................................................................................................................51
8.3.4. Serial Port Testing...............................................................................................................................51
8.3.5. Display the Version Number...............................................................................................................51
8.3.6. Display the Serial Number..................................................................................................................51
8.3.7. External controlling input testing .......................................................................................................51
8.3.8. Relay Output Testing..........................................................................................................................51
8.3.9. Renew to the Default..........................................................................................................................52
9. EXPLANATION FOR COMPARISON CONDITION..................................................................................53
9.1. PROCEDURE OF PARAMETER SETTING..........................................................................................................53
9.2. LIST OF HIGHER/LOWER LIMIT PARAMETER SETTING..................................................................................55
10. SWITCH IN/OUTPUT.................................................................................................................................57
10.1. EXTERNAL CONTROL INPUT.........................................................................................................................57
10.1.1. the Connection between Input Interface and External Switch............................................................57
10.1.2. Connection between Input Interface and PLC....................................................................................57
10.2. CONTROL OUTPUT.......................................................................................................................................58
10.2.1. Description of Output.........................................................................................................................58
10.2.2. Description of Comparison Condition................................................................................................58
10.3. ANALOG OUTPUT ........................................................................................................................................59
10.3.1. Specification.......................................................................................................................................59
10.3.2. an Example of Output.........................................................................................................................59
11. ATTACH........................................................................................................................................................60
11.1. FUNCTION TABLE.........................................................................................................................................60
11.1.1. Parameter List of General Function Setting .......................................................................................60
11.1.2. RS232/RS485 Communication Parameter List ..................................................................................62
11.1.3. Parameter List of Calibration in Kind.................................................................................................63
11.1.4. Parameter List of Digital Calibration..................................................................................................64
11.2. LIST OF STANDARD CODE ASCII.................................................................................................................65
12. RECORD..............................................................................................................................................................66

TR700 Instruction Manual
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1. General Instruction
1.1.Instruction
TR700 strain load cell, digital transmitter (transmitter for short) is a kind of multi-purpose signal
converter, integrating display, transmitting and control, with the function of serial digital signal
output and analog output etc. It is small and light, adopting guide way installation. Besides, it is
strictly tested by EMC, of high reliability, and adopts key operation and LED display at the same
time. It is applicable to all kinds of load cells of resistance strain gauge used in testing of pull,
pressure, tension, weighing material level, hopper scale, crane scale, hook scale, and tension &
pressure testing machine etc. Moreover, the analog load cell can be updated digitally, so that it could
be widely used for weighing and tension measurement in provision, light industry, metallurgy,
building material, chemical industry, colored metal, energy, and mechanism etc.
Terms Related
Definition
Scale Division The change of the show value in unit;
Only one of the numerical values (1, 2, 5, 10, 20, or 50) is optional.
Excitation Voltage The voltage to drive the resistance strain gauge sensor, provided by
the display
Resistance Strain
Gauge Sensor
It is a kind a assembly, converting force or weight data to voltage
signal
One resistance Gauge sensor contains two parts: one is a kind of metal
assembly called elastomer, deformed linearly via the force acting on
it; the other is a kind of strain chip, the resistance of which will
change via the magnitude of the elastomer’s deformation.
Output Ratio of
Resistance Strain
Gauge Sensor
The ratio of output signal voltage and excitation voltage of resistance
strain Gauge sensor, which is also called output sensitivity
Maximum Capacity The maximum that the weighing display could display;
It is preset before.
Resolution The minimum signal the meter can differentiate
Tare Load
The weight of the carrying device which can make the resistance
strain Gauge sensor output voltage
Weighing Division The change of calibrating weight in unit, displayed on the weighing
display

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2. Technical Parameters
2.1.General Specifications
1. Power supply ：DC 24V (18V～30V)
2. Power consumption ：Max. 10W
3. Operating temperature ：-5℃～to 45℃（23℉～117℉）
4. Humidity ：≤90% relative humidity（no condensation）
5. Weight ：Approx. 0.5kg
2.2.Digital
1. Digital display ：6 digits LED
2. LED height ：10 mm
3. Indicator ：Display the gross weight, the net weight, weight
variation, zero position, weight unit (Kg)
4. Negative display ：‘-’is at the most left digit
5. Overload display ：Display “O.L”
6. Scale capacity ：100～900,000
7. Scale division ：1，2，5，10，20 or 50
8. Decimal point ：4 different positions optional
2.3.Analog
1. Load cell type ：All kinds of resistance strain gauge force and weighing
load cell
2. Load cell in/output voltage ：DC 10V±5%，Maximum230mA
3. Output sensitivity ：0.5µ V/D～200µ V/D
4. Input resistance ：The resistance between each terminal can’t be less than
100MΩ at DC 500V
5. Zero voltage adjustment ：0.05mV～15.0mV
6. Input signal range ：0mV～+31mV
7. Capacity stability : ±8ppm/k of the reading
8. Temperature coefficient ：≤（0.0008% of the reading +0.3 division）/℃
9. Non-linear deviation ：≤0.005% of F.S
10. Conversion method ：Delta-sigma
11. Sampling speed ：Max. 100 times per second
12. Internal resolution ：16,000,000
13. Maximum display division ：50,000 divisions
14. Comparison cycle ：Approx. 100 times per second：

TR700 Instruction Manual
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Standard Accessory Digital output ：RS232 /RS485
Optional Accessory Analog output ：0～5V，0～10V，1~5V, 0～20mA,
4～20mA optional
3. Installation and Connection
3.1 Caution
Avoid being exposed to direct sun shine, an abrupt change of temperature and vibration；
The meter is in the best working state When temperature is approximate 20℃or 68℉and
relative humidity is about 50%;
It was tested by EMC, having the strong anti-interference ability. However, the analogue
output of sensors and in/output of RS232/RS485 is very sensitive to electronic noise, so
forbid connecting these signal cores with the power lines together, or the meter will be
disturbed. Meanwhile, keep these signal wires away from meters and other equipments’ AC
power. And shorten the length of signal wires or coaxial cables at the same time.
The ultimate accuracy of the weighing system is determined by the selection of weighing
sensors, installation, weight, signal connection, power etc together, not just by one of them.;
Analogue output is supported by single power, and the common terminal of the power can’t
be connected with other common wires or shielded wires together in case of short circuit or
damaging the meter.
The shielded wire of weighing sensor and signal wires or impulsive wires can’t compose a
circuit, or the input signal of the meter will not be stable.
3.2 Dimensions
Vertical view Side view

TR700 Instruction Manual
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3.3 Wire Connection and Interfaces
Charm 3-2 TR700 Wire Connection

TR700 Instruction Manual
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Number Definition Description
1 ＋24V The positive polarity of the module’s power supply ，
24V(18V-30V), switch power supply
2
0V
The ground of the module’s power
3 PE The protection of the module, for ground
4 Reservation
5 IN1 Digital input 1, Passive Connection Point
6 IN2 Digital input 2, Passive Connection Point
7 IN3 Digital input 3, Passive Connection Point
8 IN4 Digital input 4, Passive Connection Point
9 COMA Digital input for ground
10 AN+ Analog output+
11 AN- Analog output-
12
NC
13 NC
14 NC
15 NC
16 TX/A RS232 send terminal, RS485 A signal terminal
17 RX/B RS232 receive terminal, RS485 B signal terminal
18 GNDB RS232 和RS485 ground wire
19
NC
20 O1+ Solid relay output 1
21
O1-
Solid relay output 1
22
O2+
Solid relay output 2
23 O2- Solid relay output 2
24 O3+ Solid relay output 3
25 O3- Solid relay output 3
26 O4+ Solid relay output 4
27 O4- Solid relay output 4
28 EX+ Excitation voltage output+
29
SENSE+
Solid relay feed up+
30 EX- Excitation voltage output-
31 SENSE- Solid relay feed up-
32
SHD
The shield of sensors
33 SIG+ Signal input+
34 SIG- Signal output-
35 NC
36 NC
Table 3-1 the List of Terminals
It is only used as a signal transmitting. When multi-load cells are used, a junction box is to be used to
connect them in a parallel circuit and the final weighing signal is sent to the transmitter. The cable
between the junction box and the transmitter must have metal shielding. Refer to the Table 3-2.
Table 3-2

TR700 Instruction Manual
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The amount of load cells of
350Ω connected together Wire of NO.24（m）Wire of NO.20（m）Wire of NO.16（m）
1 240 600 1200
3
60
180
300
8
（maximum）40 120 200
3.4 Display panel
1,
Display Window
It is six-bit LED display, mainly used to display weight data or the other functional parameters. After
it is connected to the power supply, it displays ‘8.8.8.8.8.8.’for about 5 seconds, and then
automatically enters the weighing status.
The details are as follows. Table 3-3
Display
status
Weighing display
Function setting Calibration Higher/lower
limit setting
Diagnosis
Display
contents Weighing value Functional parameter Calibration parameter
Higher/lower
limit
parameter
Diagnosis
parameter
2, Status Lamp
Light
ON
OFF
Note
Gross
Display the gross
weight of the front
panel.
Only one light of Gross or
Net is on in the weighing
display state.
Net
Display the net weight
of the front panel.
Motion Scale on motion Scale on the stable state
Zero
The gross weight is
zero.
The gross weight is not
zero.