Modbus & Serial Output Transmitter for DC Voltage or Current Input

DIN Rail mounted, digitally programmable.Exceptional accuracy at high update rates.
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Serial Output Transmitter for DC Voltage or Current
Key Features
  • 0.2, 2, 20, 200, 300V & 600V input voltage ranges
  • 2, 20, 200 mA & 5A input current ranges
  • All input ranges selectable & factory calibrated
  • Accuracy to 0.01% of full scale
  • RS232 or RS485 serial communications, half or full duplex, isolated
  • Modbus RTU, Modbus ASCII or Laurel ASCII protocol
  • Detachable screw-clamp connectors
  • Dual solid state relays for alarm or control, isolated
  • 0-10V, 4-20 mA or 0-20 mA transmitter output, isolated
  • Output update rate to 60/sec
  • 5V, 10V or 24V dc transducer excitation output, isolated
Standard Features
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, DC input transmitter provides six voltage input ranges and four current input ranges, all factory calibrated and jumper selectable. Accuracy is ±0.01% of full scale input. The 200.00 mV and 2.0000 V ranges provide a high input impedance of 1 Gohm to minimize the load on the voltage signal. A 5.000A range measures the IR drop across a built-in 10 mOhm current shunt. The transmitters can also easily be scaled in software for use with external shunts. An isolate transducer excitation output is standard.

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.

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).