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Modbus & Serial Output Transmitter
for Duty Cycle Input

 Transmits ON or OFF period in percent of total period.
DIN Rail mounted, digitally programmable.

Standard Features

  • Selectable Modbus or Micron ASCII protocol
  • Modbus RTU or ASCII modes, 2-wire connection, up to 247 digital addresses
  • Transmits ON or OFF period as a percentage of total period
  • Resolution of 1%, 0.1% or 0.01%
  • Frequencies from .005 Hz to 10 kHz
  • Inputs from NPN or PNP proximity switches, contact closures, digital logic, magnetic pickups down to 12 mV, or AC inputs up to 250 Vac.
  • Triggers on positive or negative pulse edges
  • DIN rail mount package only 22.5 mm thick
  • Detachable screw clamp plug connectors
  • Easy setup with PC-based Instrument Setup Software
  • Optional dual solid state relays for alarm or control
  • 5V, 10V or 24V dc sensor excitation output, isolated
  • Dual solid state relays for alarm or control, isolated
  • 0-10V, 4-20 mA  or 0-20 mA  transmitter output, isolated
  • Universal AC power, 85-264 Vac
  • Priced Reasonably (basic duty cycle transmitter)
    Options:
  • Low voltage power, 10-48 Vdc or 12-30 Vac

Serial ASCII or Modbus Transmitter, Duty Cycle Input

CE Mark       RoHS Mark
Made in California

Description
The Micron Modbus & serial output, duty cycle input transmitter tracks ON or OFF period as a percentage from 0% to 100% of total period of repetitive pulse trains. In the illustration, duty cycle is 100 x t/P. The transmitter determines duty cycle by averaging an integral number of periods over a gate time, which is selectable from 10 ms to 199.99 s. The same signal is applied to Channels A and B. The unit divides the average pulse width by the period between pulses and expresses this ratio in percent. A resolution of 1%, 0.1% or 0.01% is selectable. By selecting leading or falling pulse edges, the ON or OFF duty cycle can be transmitted.

Clock diagram, 4-20 mA duty cycle transmitter
 
The dual-channel signal conditioner accepts inputs from proximity switches with PNP or NPN output, TTL or CMOS logic, magnetic pickups, contact closures, and AC signals from 12 mV to 250 Vac. Jumper selections provide optimum operation for different sensor types and noise conditions.

Signal conditioner board, 4-20 mA duty cycle transmitter

 
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.

Standard features of Micron 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).

Specifications
Micron Modbus & Serial Output Transmitter for Duty Cycle Input

Pulse Input
Types

Signal Ground
Minimum Signal
Maximum Signal
Maximum Frequency
Contact Debounce
AC, pulses from NPN, PNP transistors, contact closures,
magnetic pickups.
Common ground for channels A & B
Nine ranges from (-12 to +12 mV) to (+1.25 to +2.1V)
250 Vac
1 MHz, 30 kHz,  250 Hz (selectable)
0, 3, 50 ms (selectable)
Duty Cycle Mode
Item Displayed
Display Units
Frequency Range
Input Accuracy
Maximum Timing Interval
ON or OFF duty cycle of periodic pulse waveshape
1%, 0.1%, 0.01%
0.005 Hz to 50 kHz
0.01%, 0.005 Hz to 500 Hz, 0.1% at 5 kHz, 1% at 50 kHz
199.99 s
Update Rate
Conversion Interval
Gate Time
Time Before Zero Output
Gate time + 30 ms + 0-2 signal periods
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s
Serial Data I/O (standard)
Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS-485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance
RS232 or RS485 (half duplex)
300, 600, 1200, 2400, 4800, 9600, 19200 baud
250V rms working, 2.3 kV rms per 1 min test
Modbus RTU, Modbus ASCII, Micron ASCII (selectable)
32 max without a repeater.
247 max
RTU or ASCII, 2-wire.
Modbus over Serial Line Specification V1.0 (2002).
Transducer Excitation Output (standard)
Output levels
Output isolation
5V@100 mA, 10 @120 mA, 24V@50 mA (jumper selectable)
50V from signal ground
Dual Relay Output (standard)
Relay Type
Load rating
Two solid state relays, SPST, normally open, Form A
130 mA at 140 Vac or 180 Vdc
Analog Output (standard)
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 bits (65,536 steps)
0.02% of output span plus conversion accuracy
250V rms working, 2.3 kV rms per 1 minute test
Power Input
Standard power
Low power option
Power frequency
Power isolation
Power consumption
85-264 Vac 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
2W typical, 3W with max excitation output
Mechanical
Case Dimensions
Case Mounting
Electrical Connections
120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Detachable screw clamp plug connectors
Environmental
Operating Temperature
Storage Temperature
Relative Humidity
Protection
Cooling Required
0°C to 55°C
-40°C to 85°C
95% at 40°C, non-condensing
NEMA-4X (IP-65) when panel mounted
Mount transmitters so that ventilation holes are at top and bottom.
Leave 6 mm (1/4") between transmitters, or blow air by means of a fan.

Application Example
Duty Cycle and Elapsed Time of a Laser
Measuring Duty Cycle and Elapsed Time of a Laser Using Laureate Meters or Transmitters
Duty cycle can be used to indicate the ON time of a pulsed laser in relation to total time. Micron counters and transmitters can also measure elapsed time, the number of pulses, average width in µs, the number of pulses, and total energy applied.

Pinout
Micron Modbus & Serial Output Transmitter for Duty Cycle Input

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