LTM SeriesModbus & Serial Output
DIN Rail Transmitters

   
Standard Features

• Available for wide choice of analog or pulse signal inputs
• RS232 or RS485 serial communications, half or full duplex, isolated
• Modbus RTU, Modbus ASCII or Micron ASCII protocol
• Output update rate to 60/sec
• Switching power supply for 85-264 Vac
• Dual solid state relays for alarm or control
• 4, 10 or 24 Vdc transducer excitation output, isolated
• 4-20 mA, 0-20 mA or 0-10V transmitter output, jumper selectable, isolated
• Easy setup with PC-based Instrument Setup Software
• DIN rail mount housing only 22.5 mm wide
• Detachable screw-clamp connector
  Options:
• Extended main board for custom curve linearization & rate from successive readings
• Low voltage power 10-48 Vdc or 12-30 Vac

Click on the links below for transmitter descriptions and specifications by signal type. Each of the Micron transmitters listed also has a Micron digital panel meter counterpart with the same signal conditioner.

Analog Input Transmitters, Modbus or Micron ASCII I/O:

• 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)
• Temperature (ultra-linear output for 7 thermocouple types and 2 RTD types).

• 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-to-Analog Converter Transmitter (RS232 or RS485 input, isolated analog output)

Description

Micron LTM Series Modbus & serial output transmitters duplicate the performance and extensive programmable features of their Micron 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 Microns. A unique product is Micron's TS6 serial-to-analog converter transmitter, which converts serial data to an isolated analog output.

Micron 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 Micron ASCII. Modbus operation is fully compliant with Modbus Over Serial Line Specification V1.0 (2002). The Micron ASCII protocol allows up to 31 Micron devices to be addressed on the same RS485 data line. It is simpler than the Modbus protocol and is recommended when all devices are Microns. It also allows use of Micron Datalogging Software.

Easy transmitter programming is via Micron'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 Micron (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.

Standard features LTM Series transmitters include:

• Serial data output, isolated. User selectable RS232 or RS485, half or full duplex, Modbus or Micron 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 Micron'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 Micron (P/N CBL04).