Modbus & Serial Output Transmitter
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Standard Features
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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 of Laurel Datalogging Software. Standard features of Laureate transmitters include:
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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Pinouts
Laureate
Modbus & Serial Output Transmitter
for
Process Signal Input

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Specifications
Laureate
Modbus & Serial Output Transmitter
for
Process Signal Input
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Analog Input |
Range | Input Ohms |
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Voltage |
200.00 mV 2.0000 V 20.000 V 200.00 V 600.0 V |
1 Gohm 1 Gohm 10 Mohm 10 Mohm 10 Mohm |
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Current |
2.0000 mA 20.000 mA 200.00 mA 5.000 A |
100 ohms 10 ohms 1 ohm 0.01 ohm |
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Input Resolution |
16 bits (65,536 steps) |
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Transducer Excitation Output (standard) |
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Output Levels |
5V@100 mA, 10 @120 mA, 24V@50 mA (jumper
selectable) |
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Serial Data Output (standard) |
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Signal Types |
RS232 or RS485 (half or full duplex) |
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Dual Relay Output (standard) |
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Relay Type |
Two solid state relays, SPST, normally open,
Form A |
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Analog Output (standard) |
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Output Levels |
4-20 mA, 0-20 mA, 0-10 Vdc (jumper selectable) |
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Power Input |
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Standard Power |
85-264 Vac or 90-300 Vdc (DC operation not UL
approved) |
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Mechanical |
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Dimensions |
120 x 101 x 22.5 mm |
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Environmental |
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Operating Temperature |
0°C
to 55°C |
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Custom
curve linearization
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Ordering
Guide
Laureate
Modbus & Serial Output Transmitter
for
Process Signal Input
Click on the radio buttons to build a model number with pricing (shown below the Ordering Guide).
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