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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Quadrature Position or Rate
Modbus or Laurel ASCII Protocol Serial I/O Transmitter
 Transmits accurate position or rate from quadrature encoders.
DIN Rail mounted, digitally programmable.

Serial ASCII or Modbus Transmitter, Quadrature Position or Rate Input

 CE Mark      RoHS Mark

Features

  • Selectable Modbus or Laurel ASCII protocol.
  • Modbus RTU or ASCII modes, 2-wire connection, up to 247 digital addresses.
  • Programmable for position, angle or rate.
  • Accepts low-level differential or single-ended 5 V logic level outputs from shaft encoders.
  • Quadrature count x1, x2 or x4.
  • Combined pulse rate to 250 kHz.
  • Display refresh rate up to 25/s.
  • Zero channel input.
  • Isolated 5V, 10V or 15V dc excitation output.
  • DIN rail mount package only 22.5 mm thick.
  • Detachable screw clamp plug connectors.
  • Easy setup using PC-based Instrument Setup Software.
  • Optional dual solid state relays for alarm or control.

Description

Position, Length or Angle Measurement

Laureate Modbus I/O quadrature transmitters accept the A & B signals from shaft encoders to provide a highly accurate reading of position, length, angle, or rate. The A & B quadrature signals are 90º out of phase, and their phase relationship determines whether up counts (+) or down counts (-) are produced.

One, two or four transitions may be counted at a maximum combined rate of 250 kHz and be scaled internally from -999,999 to +999,999. counts. The input circuitry which 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 current 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 Quadrature Position & Rate TransmitterA zero index pulse, if available, is interpreted by the transmitter as corresponding to an integral number of revolutions of the shaft encoder. It is used by the transmitter to correct for any cumulative pulse count errors. Special circuitry corrects for width of the zero index pulse.

A built-in isolated 5V, 10V or 15V dc excitation supply is available to power shaft encoders and eliminate the need for an external power supply.

Available for Totals or Rate

  • With the Standard main board, the transmitter totalizes the counts and then scales the total in software for display and control. A zero index signal can be added as a third input to the A & B signals.
     
  • With the Extended main board, the transmitter can can also output an analog signal that tracks scaled rate. For example, the output can track the speed of a moving slab or RPM of a roller. The output update rate for position or rate is normally set to a maximum of 25/sec, as determined by a user-programmable gate time.

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 output 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.

Specifications
 Laureate Serial I/O Transmitter, Quadrature Input

Quadrature Inputs
Type
Transitions Monitored
Max Pulse Rate
Internal Counts
Position Error

Differential or single-ended quadrature
x1, x2 or x4
250 kHz at x1, 125 kHz at x2, 62.5 kHz at x4
-999999 to +999999
No error contributed by transmitter
Quadrature Position Mode
Zero Adjust
Span Adjust		 -999999 to +999999
0 to ±999999
Quadrature Rate Mode

Conversion Technique
Output Update Rate
Gate time
Time Before Zero Output
Time Base Accuracy
Zero Adjust
Span Adjust

Inverse period
30 ms + 0-2 signal periods
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s
Calibrated to ±2 ppm
-999999 to +999999
0 to ±999999
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 clamp plug 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

Using Quadrature for Cutting to Length
Using a Laureate quadrature panel meter or transmitter to cut material to length

Controlling the repetitive cutting of material to length is an excellent application of the Laureate quadrature transmitter.

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 Laureate 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 can use its optional dual relay setpoint capability for closed loop control.

Using Quadrature to Monitor a Drilling Operation
Uswing a Laureate quadrature meter or transmitter 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.

Pinout
 Laureate Serial Output Transmitter, Quadrature Input
(shown with optional analog output and dual relay output)

Pinout, Serial ASCII or Modbus Transmitter, Quadrature Position or Rate Input

  Quadrature Transmitter with Differential or Complementary Inputs
  

Pinout, Serial ASCII or Modbus Transmitter, Quadrature Position or Rate Input
Quadrature Transmitter with Single-Ended Inputs

Ordering Guide
 Modbus or Laurel ASCII Protocol Serial I/O Transmitters,
Quadrature Input

Create a model number in this format: TM6020QD. This example calls out a Modbus output transmitter, standard main board, 95-240 Vac power, isolated dual solid state relays, no analog output, and quadrature signal conditioner. Includes plug-in screw clamp connectors.
 
Transmitter
Type		 TM  Laureate Transmitter, Modbus or Laurel ASCII Protocol. $210
Main Board 6  Standard Main Board. For quadrature position only.
8  Extended Main Board. For quadrature position or rate.		 NC
$40
Power 0  Isolated 95-240 Vac & 90-300 Vdc
1  Isolated 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 or 0-10V analog output.		 NC
$25
Input Type QD    Quadrature.  $30
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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