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LTM-DU 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
Laurel 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, 95-240 Vac ±10%
- Priced at only $275
(basic duty cycle transmitter)
Options:
- Low voltage
power, 10-48 Vdc or 12-30 Vac.
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The Laureate LTM-DU
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. |
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The dual-channel
signal conditioner ccepts 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. |
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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 Model
LTM-DU 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 95-240 Vac ±10%.
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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Specifications
LTM-DU Modbus & Serial I/O Transmitter for Duty
Cycle Input
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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) |
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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 |
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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 |
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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, Laurel ASCII (selectable)
32 max without a repeater.
247 max
RTU or ASCII, 2-wire.
Modbus over Serial Line Specification V1.0 (2002). |
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Transducer Excitation Output (standard) |
Output levels
Output isolation |
5V@100 mA, 10 @120 mA, 24V@50 mA (jumper
selectable)
50V from signal ground |
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Dual Relay Output (standard) |
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 |
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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 bit DAC
±0.02% of output span plus conversion accuracy
250V rms working, 2.3 kV rms per 1 minute test |
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Power Input |
Standard power
Low power option
Frequency
Power Isolation |
95-240 Vac ±10% or 90-300 Vdc (DC operation not UL approved)
12-30 Vac or 10-48 Vdc
DC or 47-63 Hz
250V rms working, 2.3 kV rms per 1 min test |
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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 |
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Environmental |
Operating Temperature
Storage Temperature
Relative Humidity |
0°C to
70°C
-40°C to 85°C
95% at 40°C, non-condensing |
Duty Cycle and Elapsed Time of a Laser |
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Duty cycle can be used to indicate the ON time of a pulsed
laser in relation to total time. Laureate 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
LTM-DU Modbus & Serial I/O Transmitter
for Duty Cycle Input
Ordering
Guide
LTM-DU Modbus & Serial I/O Transmitter for Duty Cycle
Input
Click
on the radio buttons to build a model number with pricing.
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