Laurel Electronics provides digital panel meters / controllers, totalizers, counters, loop-powered meters, temperature meters, for all types of transducers or process indication & control.

Laureate™ Modbus or Laurel ASCII Protocol
Serial Output DIN Rail Transmitters

Laurel Electronics Serial ASCII or Modbus Transmitters

DIN Rail mounted, digitally programmable.
Exceptional accuracy at high update rates.

Features
Selectable Modbus or Laurel ASCII protocol.	Modbus RTU or ASCII modes, 2-wire connection, up to 247 digital addresses.
Output accuracy: ±0.01% of span for DC signals (±0.1% for AC rms).	Output update rate to 50 or 60/sec.
95-240V AC power standard.	Low voltage AC or DC power optional.
Built-in 5V, 10V or 15V dc excitation output.	Mountable on 35 mm DIN rail.
Only 22.5 mm thick.	Detachable screw clamp connectors.
Easy setup using Laurel's PC-based Instrument Setup Software.	Optional isolated scalable analog output (4-20 mA or 0-10V).
Optional dual solid state relays for alarm or control.	Optional custom curve linearization (Extended main board).

Serial Output Transmitters by Input Signal

Click on the links below for transmitter descriptions and specifications by signal type. Each of the Laureate transmitters listed also has a Laureate digital panel meter counterpart with the same signal conditioner.

Analog Input Transmitters, Modbus or Laurel ASCII I/O:

DC voltage or current.
AC rms voltage or current.
Process, strain gauge & potentiometer follower (full scale ranges down to ±200 mV).
Process Totalizer (for 0-1 mA, 4-20 mA or 0-10V signals).
Load cell & microvolt (full scale ranges down to ±20 mV).
Temperature (ultra-linear output for 7 thermocouple types and 2 RTD types).

Pulse Input Transmitters, Modbus or Laurel ASCII I/O:

Dual Channel Frequency (for frequency, rate, or period).
Dual Channel Pulse Input Totalizer (Rate or total. Selectable square root extraction).
Arithmetic Functions (applied to Rate or Total with 2 Input Channels: A+B, A-B, AxB, A/B, A/B-1).
Duty Cycle (transmits ON or OFF period in percent of total period).
Stopwatch (timing for Single Events or Accumulated Events).
Time Interval (average time of Periodic Events).
Phase Angle (for angular phase offset in degrees of AC waveforms).
Quadrature (position or rate from quadrature encoder signals).

Serial Input (Modbus or Laurel ASCII), Analog Output Transmitter:

Serial-to-Analog Converter Transmitter

Description
Laureate TM Series serial output transmitters can be jumpered for two signal levels: RS232 or RS485. Two serial protocols are selectable in software: Modbus or Laurel's Custom ASCII.

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.

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 terminal connectors. The transmitters duplicate the performance and extensive programmable features of their Laureate digital panel meter, counter and timer counterparts. Features include exceptional accuracy at high read rate.

For DC input signals (DC, process, load cell, strain, potentiometer follower), output accuracy is ±0.01% of full scale input, as provided by the 16-bit analog-to-digital converter front end. Full conversion accuracy is maintained in the Modbus output. Advanced standard features made possible by Modbus operation include peak capture and latched relay operation, with Reset provided by external or digital commands.

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.

Transmitter programming is via the unit's 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.

General Specifications
Modbus Laureate Transmitters
(Click on links in previous section for details by signal type)

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.

Online pricing & ordering for Modbus I/O transmitters
Analog input models	Pulse input & process totalizer models	Serial-to-analog converter

FLW, Inc - 3505 Cadillac Ave - Bldg E - Costa Mesa, CA. - 92626 - USA - Ph (714) 751 - 7512 - Fax (714) 751 - 0213

Laureate™ Modbus or Laurel ASCII Protocol Serial Output DIN Rail Transmitters

Laureate™ Modbus or Laurel ASCII Protocol
Serial Output DIN Rail Transmitters