Laurel Electronics for Digital Panel Meters, Counters, Timers, Transmitters, Digital Displays

Digital Panel Meters - Counters - Timers
DIN Rail Transmitters - Large Digit Displays

    

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Process, Strain Gauge &
 Potentiometer Follower Input
 Modbus or Laurel ASCII Protocol Serial I/O Transmitter
Scalable for process, strain, pressure, level, flow ...
DIN Rail mounted, digitally programmable.

Features

  • Selectable Modbus or Laurel ASCII protocol.
  • Modbus RTU or ASCII modes, 2-wire connection, up to 247 digital addresses.
  • Digital span adjust from 0 to ±99,999.
  • Digital zero adjust from -99,999 to +99,999.
  • 0.2, 2, 20, 200, 300V & 600V DC voltage ranges.
  • 2, 20, 200 mA and 5A DC current ranges.
  • All ranges factory calibrated.
  • Peak value capture and auto-tare.
  • Output accuracy: ±0.01% of full scale input.
  • Output update rate to 60/sec.
  • Built-in 5V, 10V or 15V transducer excitation output.
  • DIN rail mount package only 22.5 mm thick.
  • Detachable screw terminal connectors.
  • Easy setup using PC-based Instrument Setup Software.
  • Optional dual solid state relays for alarm or control.
  • Optional isolated scalable analog output (4-20 mA or 0-10V).
  • Optional custom curve linearization (Extended main board).
 		Serial ASCII or Modbus Transmitter, Process, Strain Gauge or Ptentiometer Follower Input

CE Mark       RoHS Mark

Description

Signal Types & Ranges.

Laureate TM Series serial output, process input transmitters provide six DC voltage ranges and four DC current ranges for use with a wide range of industrial transducers whose output requires zero and span adjustment. All ranges are factory calibrated and jumper selectable. The two most sensitive voltage ranges, 200 mV and 2V, provide a high input impedance of 1 Gohm to minimize the load on the voltage signal.

With the Laureate process transmitters described in this web page, strain gauges with a 20 mV output can be internally scaled to display up to 10,000 counts, while outputs of 200 mV can be scaled to 99,999 counts. With Laureate load cell transmitters, strain gauges with a 20 mV output can be internally scaled to the full 99,999 counts.

Laureate process input transmitters duplicate the performance and programmable features of their Laureate process digital panel meter counterparts. Features include exceptional accuracy at high read rate, and optional dual solid state relays for local alarm or control. The transmitters are housed in a DIN rail case that is only 22.5 mm (0.89") thick. Signal connections are via detachable screw terminal connectors.

Serial Data I/O & Programming

Laureate TM Series transmitters send data as a serial digital signal. RS485 or RS232 signal levels are jumper selectable and can each be associated with either the Modbus protocol or Laurel’s simpler Custom ASCII protocol.

  • Modbus protocol operation is fully compliant with the Modbus Over Serial Line Specification V1.0 (2002) for 2-wire, half-duplex connection. This includes RTU or ASCII modes, addressing of up to 32 devices per RS485 line without a repeater, and up to 247 digital addresses. Modbus operation allows devices by different manufacturers to be connected in parallel and be addressed using the same protocol.
     
  • Laurel’s Laurel ASCII protocol allows up to 31 Laureate devices to be addressed on the same RS485 data line. It is simpler than the Modbus protocol and is recommended when all devices are Laureates. It also allows use of Laurel’s datalogging software.

Transmitter programming is via the unit's three-terminal serial port using Laurel's PC-based Instrument Setup Software. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from Laurel (P/N CBL03). Laurel's Serial I/O transmitters and meters can also be part of PC-based data logging systems using Laurel's Datalogging Software, which operates under the Laurel ASCII Protocol. A single software command switches between the Modbus and Laurel ASCII Protocols.

Transmitter Options

Options include dual solid state relays for local alarm or control and an isolated 4-20 mA or 10V (selectable) analog output, effectively providing a linearized analog transmitter output that tracks the reading that would be transmitted digitally. The analog output provides 12-bit (4096 step) resolution of the output span and is ultra-linear to within one bit. Its accuracy is ±0.05% of span for all signal types, except for AC rms, where accuracy is ±0.1%. Output isolation from signal and power grounds is provided by a separate on-board power supply, which can drive 20 mA into a 500 ohm load for 10V compliance. Output isolation eliminates problems caused by ground loops.

DIN Rail Mounting 

Laureate transmitters are housed in a 35 mm DIN rail case that is only 22.5 mm (0.89") thick. Signal connections are via detachable screw clamp plug connectors.

Pinout
 Process, Strain Gauge & Potentiometer Follower Input
(shown with optional analog output and dual relay output)

Pinout, Serial ASCII or Modbus Transmitter, Process, Strain Gauge or Ptentiometer Follower Input

                                    Strain Gauge Transmitter

Pinout, Serial ASCII or Modbus Transmitter, Process, Strain Gauge or Ptentiometer Follower Input

Pinout, Serial ASCII or Modbus Transmitter, Process, Strain Gauge or Ptentiometer Follower Input

Externally Powered 4-Wire Process Transmitter

2-Wire Process Transmitter

Specifications
 Laureate Serial I/O Transmitters,
Process, Strain Gauge, or Potentiometer Follower Input

Analog Input Range Resolution Input Ohms
Voltage
 
 
 
  		  200.00 mV 
2.0000 V
20.000 V
200.00 V
600.0 V		 10 µV
100 µV
1 mV
10 mV
100 mV		 1 Gohm
1 Gohm
1 Mohm
1 Mohm
1 Mohm
Current
 
 
  		2.0000 mA
20.000 mA
200.00 mA
5.000 A		 0.1 µA
1 µA
10 µA
1 mA		 100 ohms
10 ohms
1 ohm
0.01 ohm
Input Resolution
Input Accuracy
Update Rate, Max
Max Applied Voltage
Over-current protection		 16 bits (65,536 steps)
±0.01% of full scale input (determined by ADC).
50/sec at 50 Hz, 60/sec at 60 Hz.
600 Vac for 20, 200 & 600 V ranges, 125 Vac other ranges.
25x for 2 mA, 8x for 20 mA, 2.5x for 200 mA, 1x for 5A.
Serial I/O (standard)
Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS-485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance		 RS485 (default) or RS232 (jumper selectable)
300, 600, 1200, 2400, 4800, 9600, 19200 baud
250V rms working, 2.3 kV rms per 1 min test.
Modbus RTU, Modbus ASCII, Laurel ASCII (selectable)
32 max without a repeater.
247 max
RTU or ASCII, 2-wire.
Modbus over Serial Line Specification V1.0 (2002).
Transducer Excitation Output (standard)
Jumper Selection 1
Jumper Selection 2
Jumper Selection 3		 10V @ 60 mA, isolated to 50V from signal ground
5V @ 50 mA, isolated to 50V from signal ground
15V @ 60 mA, non-isolated
Dual Relay Output (optional)
Relay Type
Load rating		 Two solid state relays, SPST, normally open, Form A
120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance.
Analog Output (optional)
Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation		 0-20 mA, 4-20 mA or  0-10 Vdc (selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load )
12 bits (4,096 steps)
±0.05% of output span
250V rms working, 2.3 kV rms per 1 minute test
Power Input
Standard power
Low power option
Frequency
Power Isolation		 95-240V AC ±10% or 90-300V DC
12-30V AC or 10-48V DC
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test.
Mechanical
Case Dimensions
Case Mounting
Electrical Connections		 120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Detachable screw terminal connectors
Environmental
Operating Temperature
Storage Temperature
Relative Humidity		 0°C to 70°C
-40°C to 85°C
95% at 40°C, non-condensing

Application Examples

Wiring a Laureate transmitter for a potentiometric pot follower application
Potentiometer Application

In potentiometric (or potentiometer follower) applications, the signal from a sliding contact voltage divider can be converted to engineering units such as position, level or percentage. By operating in a ratiometric mode, the transmitter will remove any effects caused by variations in the excitation supply.

For use with a 1 kohm potentiometer, the recommended applied excitation voltage is 10V, and a 2 kohm resistor should be placed in series with the excitation output and excitation return leads. This will allow the transmitter's 2V scale with a high input impedance of 1 Gohm to be used.

Custom curve linearization

Using a linearizing digital panel meter or transmitter

A Laureate process transmitter with the Extended main board option allows exceptionally accurate custom curve linearization. For setup, up to 180 data points can be entered into a spreadsheet. The system then creates multiple non-linear spline-fit segments, which provide much better accuracy than linear segments. One application, as illustrated, is the readout of volume of irregularly shaped tanks based on measured liquid level or pressure. Altimeters and thermistors are further applications.

Ordering Guide
 Modbus or Laurel ASCII Protocol Serial I/O Transmitter,
Process, Strain or Potentiometer Follower Input

Create a model number in this format: TM202P. This example calls out a 4-20 mA output transmitter, standard main board, 95-240 Vac power, isolated dual solid state relays, and a process input signal with the factory default setting 0-200 mV in = 0-100.00 out. Includes plug-in screw terminal connectors.
  
Main
Board		 2  Standard Main Board.
4  Extended Main Board.
Note: Extended allows custom curve linearization and rate from successive readings.		 NC
$40
Power 0  95-240 Vac & 90-300 Vdc
1  12-30 Vac & 10-48 Vdc.		 NC
$30
Setpoint
Output		 0  None.
2  Isolated Dual Solid State Relays.		 NC
$30
Analog Output 0  None.
1  4-20 mA, 0-10V.		 NC
$25
Signal
Input		 Process Signals (e.g., 4-20 mA, 0-5 V)
P    Default Scaling. 4-20 mA in = 0-100.00 out.
P1  Custom Scaling.
In the write-in field of your invoice, specify min input, min reading; max input, max reading.		  
NC
$10
Strain Gage, Potentiometer (4-wire ratio)
SG    Default Scaling. 0-200 mV = 0-100.00.
SG1  Custom Scaling.
In the write-in field of your invoice, specify min input, min reading; max input, max reading.		  
NC
$10
Note: The same DC signal conditioner can be user configured for process, strain or potentiometer follower signals, as well as DC Volts or DC Amps. It is precalibrated in EEPROM for all DC Volt and DC Amp ranges listed for DC transmitters.
Accessories CBL03  RS-232 cable, TM to computer.
CBL02  USB to RS-232 cable adapter.		 $19
$39
 
Laurel Electronics domestic orders Order from distributors for shipment to USA or Canada.
Laurel Electronics international orders Order online for international shipment.

 

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Laurel Electronics, Inc.
Industrial Instrumentation & Displays
3183-G Airway Avenue
Costa Mesa, CA 92626, USA
Phone: (714) 434-6131
Fax:     (714) 434-3766

  
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