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Digital Panel Meters - Counters - Timers - DIN Rail Transmitters - Large Digit Displays |
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LTM Series
Modbus & Serial I/O
DIN Rail Transmitters
DIN Rail mounted, digitally
programmable.
Exceptional accuracy at high update rates.
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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:
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Description
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). The transmitters convert the analog signal into an internal digital reading from -99,999 to +99,999 counts for analog signals and -999,999 to +999,999 counts for pulse signals. Specific readings in counts are then assigned to the desired minimum and maximum analog output. Multiple calibration methods are selectable for use with or without an external calibration reference. 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 analog output can be individually selected to be either unfiltered or filtered. Laureate transmitters are available for a wide range of signals and duplicate the high accuracy, high read rate, and extensive programmable features of their Laureate™ digital panel meter, counter and timer counterparts. In addition to isolated serial communications, standard features include an isolated 16-bit analog output (4-20 mA, 0-20 mA or 0-10V) plus dual solid state relays for control or alarm. The housing snaps onto a 35 mm DIN rail and is only 22.5 mm (0.89") wide. Signal connections are via detachable screw-clamp plugs. |
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 Laurels. A unique
product is Laurel's
General
Specifications
Laureate LTM Series
Modbus & Serial I/O Transmitters
| Serial Communications (standard) | |
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Signal Types Data Rates Output Isolation Serial Protocols Modbus Modes Modbus Compliance Digital Addressing |
RS232 or RS485 (half or full duplex) 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 RTU or ASCII Modbus over Serial Line Specification V1.0 (2002). 247 Modbus addresses. Up to 32 devices on RS485 line w/o a repeater |
| Dual Relay Output (standard) | |
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Relay Type Load rating |
Two solid state relays, SPST, normally open,
Form A 120 mA at 130 Vac or 170 Vdc, 28 ohms in series |
| Analog Output (standard) | |
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Output Levels Compliance, 4-20 mA Compliance, 0-10V Output Resolution Output Accuracy Output Isolation |
4-20 mA, 0-20 mA, 0-10 Vdc (jumper selectable) 10V ( 0-500 ohm load ) 2 mA ( 5 kOhm load or higher) 16 bit DAC ±0.015% of output span plus conversion accuracy 250V rms working, 2.3 kV rms per 1 minute test |
| Transducer Excitation Output (standard) | |
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Output Isolation Selectable Levels |
50 Vdc to meter ground 5 Vdc ±5%, 100 mA 10 Vdc ±5%, 120 mA 24 Vdc ±5%, 50 mA |
| Power Input | |
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Standard power Low power option Power frequency Power Isolation |
95-240 Vac ±10% or 90-300 Vdc (DC operation not UL approved) 10-48 Vdc or 12-30 Vac DC or 47-63 Hz 250V rms working, 2.3 kV rms per 1 min test |
| Mechanical | |
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Case Dimensions Case Mounting Electrical Connections |
120 x 101 x 22.5 mm 35 mm rail per DIN EN 50022 Detachable screw-clamp plugs |
| Environmental | |
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Operating Temperature Storage Temperature Relative Humidity |
0°C to
70°C -40°C to 85°C 95% at 40°C, non-condensing |
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