Modbus & Serial Output Transmitter for Process Signal Input

Scalable for process signals requiring zero and span adjustment. Ideal for pressure & flow. DIN Rail mounted, digitally programmable.
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Key Features
  • Easy setup with PC-based Instrument Setup Software
  • DIN rail mount housing only 22.5 mm wide
  • Detachable screw-clamp connectors
  • 5V, 10V or 24V dc transducer excitation output, isolated
  • Dual solid state relays for alarm or control, isolated
  • 0-10V, 4-20 mA or 0-20 mA analog output, scalable, isolated
  • 200 mV, 2V, 20V, 200V, 300V & 600V DC voltage ranges
  • 2, 20, 200 mA and 5A DC current ranges
  • All ranges factory calibrated
  • Digital span adjust from 0 to ±99,999
  • Digital zero adjust from -99,999 to +99,999
Standard Features
  • RS232 or RS485 serial communications, half or full duplex, isolated
  • Modbus RTU, Modbus ASCII or Laurel ASCII protocol
  • Output update rate to 60/sec
  • 4-20 mA, 0-20 mA or 0-10V transmitter output, jumper selectable, isolated
  • Universal AC power, 85-264 Vac
  • Priced at only $235 (basic process transmitter)
Options
  • Extended main board for custom curve linearization & rate from successive readings
  • Low voltage power, 10-48 Vdc or 12-32 Vac
Description

The Laureate Modbus & serial output, process signal input transmitter provides six DC voltage input ranges and four DC current input ranges for use with a wide range of 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.

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. 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 analog output can be individually selected to be either unfiltered or filtered.

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 ofLaurel Datalogging Software.

Standard features of Laureate transmitters include:

  • Serial data output, isolated. User selectable RS232 or RS485, half or full duplex, Modbus or Laurel ASCII protocol.
  • Dual solid state relays for control or alarm, isolated. Rated 120 mA at 130 Vac or 170 Vdc.
  • Transducer excitation output, isolated. User selectable 5V@100 mA, 10V@120 mA or 24V@50 mA.
  • Analog transmitter output, 16-bit, user scalable and isolated. User selectable 4-20 mA, 0-20 mA or 0-10V levels.
  • Universal AC power supply for 85-264 Vac.

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).


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