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Panel Meters - Counters - Timers - Transmitters, 4-20 mA & Modbus - Ethernet - USB - RS485 - RS232

Ethernet & 4-20 mA Output Transmitter for Bidirectional Position or Rate from Quadrature Encoders

Transmits accurate position or rate from shaft encoders & linear encoders. DIN Rail mounted, digitally programmable.

Ethernet transmitter


  • Ethernet data I/O, Modbus TCP protocol.
  • 4-20 mA, 0-20 mA or 0-10V transmitter output, 16 bits, jumper selectable, isolated.
  • Dual 120 mA solid state relays for alarm or control, isolated.
  • 5V, 10V or 24V dc transducer excitation output, isolated.
  • Accepts low-level differential or single-ended 5V logic level signals from shaft
    encoders, linear encoders, incremental encoders or optical encoders.
  • Programmable for position, angle or rate
  • Pulse rate up to 250 kpulses/sec at X1, 125 kpulses/sec at X2, 62.5 kpulses/sec at X4.
  • Zero channel input.
  • Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span.
  • Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power.

The Laureate quadrature transmitter accepts A & B quadrature encoder signals to provide an analog output that tracks position, length, angle, or rate. The A & B quadrature signals are 90° out of phase, and their phase relationship determines whether up counts (+) or down counts (-) are produced.

One, two or four quadrature transitions may be counted at a maximum combined rate of 250 kHz and be scaled internally to ±999,999 counts. The input circuitry may be jumpered for either single-ended input signals or for balanced line driver signals. Anti-jitter circuitry eliminates errors produced by vibration of the encoder. In the event of a power failure, the latest total may be stored in non-volatile memory and can be used as the starting point for counting when power resumes. Power fail or zero index capabilities are alternate meter setup choices.

Signal Conditioner Board for Laureate Analog Input Flow Rate Meter and Analog Flow Totalizer

A zero index pulse, if available, is interpreted as indicating a zero reference for an integral number of revolutions of a rotary shaft encoder or the home position of a linear encoder. It is used by the meter for initializing and to correct for any cumulative pulse count errors. Special circuitry corrects for width of the zero index pulse.

Bidirectional Total or Rate

  • With the Standard main board, the transmitter totalizes the quadrature counts and then scales the total in software for the output. A zero index Z signal can be added as a third input to the A & B signals. The analog output is generated by an ultra-linear 16-bit (65,536 step) digital-to-analog converter (DAC) for 0.02% output accuracy.
  • With the Extended main board, the transmitter can be programmed to output either total or rate or rate. For example, the output can track the speed of a moving slab from the RPM of a roller. The update rate for rate is a programmed gate time + 30 ms + 0-2 pulse periods.

Unidirectional Total and Rate

If the counts are only for one direction, for example for extusions measured by an encoder wheel, only the encoder's "A" channel can be used and be output to an Extended Laureate totalizer transmitter. This model accommodates very high pulse rates up to 1 MHz, and unlike the quadrature transmitter, it can simultaneously track rate and total.

Standard features of Laureate LTE transmitters include:

  • Ethernet I/O, isolated. The supported protocols are Modbus RTU and ASCII, which are tunneled via Modbus TCP. Note that RS232 or RS485 data I/O is provided by Laurel's LT Series transmitters.
  • 4-20 mA, 0-20 mA or 0-10V analog transmitter output, isolated, jumper-selectable and user scalable. All selections provide 16-bit (0.0015%) resolution of output span and 0.02% output accuracy of a reading from -99,999 to +99,999 counts that is also transmitted digitally. Output isolation from signal and power grounds eliminates potential ground loop problems. The supply can drive 20 mA into a 500 ohm (or lower) load for 10V compliance, or 10V into a 5K ohm (or higher) load for 2 mA compliance.
  • Dual solid state relays, isolated. Available for local alarm or control. Rated 120 mA at 130 Vac or 180 Vdc.
  • Universal 85-264 Vac power. Low-voltage 10-48 Vdc or 12-32 Vac power is optional.

Node discovery and configuration of Laureate Ethernet transmitters are easily achieved with Laurel's Windows based Instrument Setup Software. Additional features are provided by Laurel's Windows based Node Manager Software, such as the ability to send emails or test messages either periodically or in the event of an alarm. Both softwares run on a PC under MS Windows, are at no charge, and can be downloaded from this website.

Laureate Ethernet network by Laurel Electronics
Laureate Ethernet & 4-20 mA Output Transmitter for Position or Rate from Quadrature Encoders
Quadrature Inputs
Type Differential or single-ended quadrature
Transitions Monitored x1, x2 or x4
Max Pulse Rate 250 kpulses/sec at X1, 125 kpulses/sec at X2, 62.5 kpulses/sec at X4
Internal Counts -999999 to +999999
Position Error No error contributed by transmitter
Differential High Theshold +200 mV
Differential Low Threshold -200 mV
Differential Limits -11V to +14V
Single-ended High Voltage 2.5V to 10V
Single-ended Low Voltage -1V to +1V
Input Resistance, Typ. 17 kOhm
Quadrature Position Mode
Zero Adjust -999999 to +999999
Span Adjust 0 to ±999999
Quadrature Rate Mode
Conversion Technique Inverse period
Output Update Rate 30 ms + 0-2 signal periods
Gate time Selectable 10 ms to 199.99 s
Time Before Zero Output Selectable 10 ms to 199.99 s
Time Base Accuracy Calibrated to ±2 ppm
Zero Adjust -999999 to +999999
Span Adjust 0 to ±999999
Analog Output (standard)
Output Levels 4-20 mA and 0-10 Vdc (selectable)
Compliance, 4-20 mA 10V (0-500 ohm load)
Compliance, 0-10V 2 mA (5 kOhm load)
Output Resolution 16 bits (65,536 steps)
Output Accuracy ±0.05% of output span
Output Update Rate 25/sec max
Output Isolation 250V rms working, 2.3 kV rms per 1 minute test
Ethernet Data I/O (standard)
Type 10/100 Base-T Ethernet per IEEE 802.3
Data Rates 300, 600, 1200, 2400, 4800, 9600, 19200 baud
Output Isolation 250V rms working, 2.3 kV rms per 1 min test
Serial Protocol Modbus TCP
Modbus Compliance Modbus over Serial Line Specification V1.0 (2002)
Digital Addresses 247
Dual Relay Output (standard)
Relay Type Two solid state relays, SPST, normally open, Form A
Load Rating 120 mA at 140 Vac or 180 Vdc
Sensor Excitation Output (standard)
Output Levels 5V@100 mA, 10V@120 mA, 24V@50 mA (jumper selectable)
Output Isolation 50V from signal ground
Power Input
Standard Power 85-264 Vac or 90-300 Vdc
Low Power Option 10-48 Vdc or 12-32 Vac
Power Frequency DC or 47-63 Hz
Power Isolation 250V rms working, 2.3 kV rms per 1 min test
Power Consumption 2.5W typical at 24V, 4.0W with max excitation output
Dimensions 129 x 104 x 22.5 mm case
Mounting 35 mm rail per DIN EN 50022
Electrical Connections Plug-in screw-clamp connectors
Operating Temperature 0°C to 55°C
Storage Temperature -40°C to 85°C
Relative Humidity 95% at 40°C, non-condensing
Cooling Required Mount transmitters with ventilation holes at top and bottom. Leave 6 mm (1/4") between transmitters, or force air with a fan.
Laureate™ Ethernet & 4-20 mA Output Transmitter for Position or Rate from Quadrature Encoder
LTE Ethernet Transmitter Pinout
Applications Examples
Using Quadrature for Cutting to Length
Using quadrature panel meters or transmitters to cut material to length Controlling the repetitive cutting of material to length is an excellent application of a Laureate quadrature transmitter or Laureate quadrature meter.

The quadrature encoder shares the shaft of a sensing wheel, whose rotation corresponds to lineal displacement of material. The transmitter compares the displacement reading against setpoint information, and then uses its dual relays to first slow down and then cut the material.
Using Quadrature for X-Y Positioning
Using quadrature panel meters or transmitters for X-Y positioning Accurate X-Y position or rate can be obtained from two shaft encoders, which convert linear position to quadrature signals as a shaft turns. In addition to serving as a transmitter, each Laureate transmitter or meter can use its optional dual relay setpoint capability for closed loop control.
Using Quadrature to Monitor a Drilling Operation
Uswing quadrature meters or transmitters to monitor an oil drilling operation Quadrature can be used to track position and vertical drilling speed of the bit in an oil drilling operation. A shaft encoder is rotated by a cable that moves with the drilling shaft. In this application, the same encoder signal is applied to a Laureate quadrature transmitter for position, and to a second quadrature transmitter for rate. Both transmitters can send a 4-20 mA signal to a control room and be alarmed.

In this application, quadrature provides much higher immunity to noise and jitter than a magnetic pickup.
For applications assistance, phone 714-434-6131 ext. 104, or email
Ordering Guide
Laureate™ Ethernet & 4-20 mA Output Transmitter for Position or Rate from Quadrature Encoders
Click on the radio buttons to build a model number with pricing as shown below. Prices are in US dollars and do not include shipping or duty charges (export sales). Please see our explanations and limitations applicable to pricing and online orders. Prices shown are in US Dollars and are Laurel's manufacturer's suggested retail price (MSRP) in the USA. Orders are processed manually, not directly by our shopping cart system. You don't have to supply credit card information when placing an online order.

North American Orders. Laurel does not sell factory-direct in the USA or Canada. Online sales orders are filled through distribution. During the ordering process, you will have the chance to select an authorized Laurel distributor, or you can ask Laurel to refer you to a distributor. The distributor will then contact you to quote shipping, tax and duty (where applicable), and arrange for payment.

International Orders. If your ship-to address indicates that you are outside of the USA or Canada and Laurel has a distributor in your country, we will forward your order to that distributor for follow-up. If Laurel does not have a distributor in your country, we will email you an order acknowledgment and a pro forma invoice which states the product price, shipping charges, and wire transfer information, which includes a $25 bank wire transfer fee.

Questions about your order? Please email your distributor or
LTE  4-20 mA & Ethernet output transmitter $388
LT  4-20 mA & RS232/RS485 output transmitter $164
Main Board 6  Standard Main Board $0
8  Extended Main Board $55
With Standard Main Board:Scalable to ±999,999 to read out position, length or angle from shaft encoders. With Extended Main Board: Scalable to ±999,999 to read out bi-directional rate or position from shaft encoders (not simultaneously).  
Power 0  Isolated 85-264 Vac or 90-300 Vdc $89
1  Isolated 12-32 Vac or 10-48 Vdc $89
Input Type QD  Quadrature. $123
Add-on Options -X  Extended operating temperature option from -40°C to 70°C $0
Configured model number LTE60QD
Configured price per model $600
Quantity 1
Extended price $600
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