LTM Series Modbus & Serial Output DIN Rail Transmitters

• DC voltage or current.
• AC rms voltage or current.
• Process signal (wide range of DC voltage or current signals)
• Process signal totalizer (for 0-1 mA, 4-20 mA or 0-10V signals)
• Strain gauge & potentiometer (full scale ranges down to ±200 mV)
• Load cell & microvolt (full scale ranges down to ±20 mV)
• Thermocouple temperature (ultra-linear output for 7 thermocouple types)
• RTD Temperature (ultra-linear for Pt100, Ni120 and Cu10 RTDs)
• Resistance in ohms (five resistance ranges from 20.000 Ω to 200.00 kΩ)

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, 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 pvents)
• 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 (RS232 or RS485 input, isolated analog output)

• Extended main board for custom curve linearization & rate from successive readings
• Low voltage power 10-48 Vdc or 12-32 Vac

Laureate LTM Series serial output transmitters send data via an isolated serial port, which is user configurable for RS232 or RS485 and full or half duplex operation. Three protocols are user selectable: Modbus RTU, Modbus ASCII, or Laurel ASCII. Modbus operation is fully compliant with Modbus Over Serial Line Specification V1.0 (2002). The 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 Datalogging Software.

Easy Transmitter programming is via Laurel's Instrument Setup Software, which runs on a PC under MS Windows. This software can be downloaded from this website at no charge. The required transmitter-to-PC interface cable is available from Laurel (P/N CBL04).

Fast read rate at up to 50 or 60 conversions per second while integrating the signal over a full power line cycle is provided by Concurrent Slope (Pat 5,262,780) analog-to-digital conversion for analog input signals. High read rate is ideal for peak or valley capture and for real-time computer interface and control. Digital signal filtering modes are selectable for stable readings in electrically noisy environments. The internal digital readings and the output can be individually selected to be either unfiltered or filtered.

Laureate LTM Series Modbus & serial output transmitters duplicate the performance and extensive programmable features of their Laureate digital panel meter, counter and timer counterparts. They are available for a wide range of analog and pulse input signals types. A related product is Laurel's TS6 serial-to-analog converter transmitter, which converts serial data to an isolated analog output.