Modbus & Serial Output Transmitter
for Time Interval of Periodic Events
From from 1 ĩs to 199.999 s. Resolution to 0.2 ĩs.
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. For periodic events with width from 1 ĩs to 199.999 s Transmitted 6-digit decimal reading Resolution to 0.2 ĩs Rep rated to 250 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 Trigger on positive or negative pulse edges DIN rail mount package only 22.5 mm thick Plug-in screw-clamp connectors Easy setup with PC-based Instrument Setup Software 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 analog output, isolated Universal AC power, 85-264 Vac Priced at only $235 (basic time interval transmitter) Options: Low voltage power, 10-48 Vdc or 12-32 Vac

Description

The Laureate Modbus & serial output, time interval input transmitter can transmit pulse width or time delay between individual pulses to a resolution of 0.2 ĩs for periodic events. It can also transmit average pulse width or average time delay between multiple pulses.

Time interval is measured between inputs on channels A and B. Timing starts when a pulse is applied to Channel A (selectable positive or negative edge), and ends when a pulse is applied to Channel B (selectable positive or negative edge). In case of a single pulsed signal, the A and B inputs can be tied together. A positive or negative slope may be selected to start timing, and the opposite slope must be selected to stop timing. Timing is achieved by counting 5.5 MHz clock pulses. Multiple integral time intervals are averaged over a gate time which is selectable from 10 ms to 199.99 s and also controls the maximum output rate.

The dual-channel signal conditioner used for pulse detection accepts inputs from proximity switches with PNP or NPN output, TTL or CMOS logic, magnetic pickups, contact closures, and other signals from 12 mV to 250 Vac. Jumper selections provide optimum operation for different sensor types and noise conditions. A built-in 5V, 10V or 24V dc excitation supply can power proximity switches and other sensors, and eliminate the need for an external power supply.

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:

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 85-264 Vac.

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).

Specifications
Laureate Modbus & Serial Output Transmitter
for Time Interval of Periodic Events

Pulse Input

Types

Ch A Frequency, Max
Ch B Frequency, Max
Signal Ground
Minimum Signal
Maximum Signal
Maximum Frequency
Contact Debounce
Time Base Accuracy
Span Tempco
Long-term Drift

AC, pulses from NPN, PNP transistors, contact closures,
magnetic pickups.
1 MHz.
250 kHz.
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)
Quartz crystal calibrated to ą2 ppm
ą1 ppm/°C (typ)
ą5 ppm/year

Time Interval Mode

Timing Start
Timing Stop
Periodic Timing Interval
Gate Time
Time Before Zero Output

Channel A pulse, + or - edges
Channel B pulse, + or - edges
Gate time + 30 ms + 0-2 time intervals
Selectable 10 ms to 199.99 s
Selectable 10 ms to 199.99 s

Resolution

0 - 199.999 s
0 - 99.9999 s
0 - 9.99999 s
0 - .999999 s
0 - .099999 s

1 ms
100 ĩs
10 ĩs
1 ĩs
0.2 ĩs (after averaging)

Serial Data Output (standard)

Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS48 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).

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
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 12-32 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

Dimensions
Mounting
Electrical Connections

120 x 101 x 22.5 mm
35 mm rail per DIN EN 50022
Plug-in screw-clamp connectors

Environmental

Operating Temperature
Storage Temperature
Relative Humidity
Cooling Required

0°C to 55°C
-40°C to 85°C
95% at 40°C, non-condensing
Mount transmitters with ventilation holes at top and bottom.
Leave 6 mm (1/4") between transmitters, or force air with a fan.

Typical Applications
Time Interval Mode for Time Delay
	For periodic pulses applied to A and B channels, time delays can be measured down to 0.2 ĩs resolution from the rising or falling edge of A to the rising or falling edge of B (selectable).
Time Interval Mode for Pulse Width
	The width of periodic pulses (t1 or t2) can be measured by tying the A and B channels together. As for time delay, readings are averaged over a user-selectable gate time.
Timing Process Dynamics with a Panel Meter and Time Interval Meter
	The start and stop pulses used for timing can be generated by the dual relay board in a Laureate panel meter or digital counter. For instance, the start and stop pulse edges can be created as temperature passes two alarm setpoints, or temperature cycles in a hysteresis control mode.
Replacing an Oscilloscope with a Laureate Time Interval Meter
	An oscilloscope is great for viewing and timing pulses in a lab. However, in fixed installations where digital timing accuracy and control outputs are required, a low-cost Laureate time interval meter will be the instrument of choice. Resolution to 0.2 ĩs is feasible.

Instrumenting a Pulsed Laser System

Some of the many possibilities in instrumenting a pulsed laser system with Laureate dual-channel counters and transmitters: elapsed time, number of pulses, pulse width, pulse separation, duty cycle, and pulse rep rate.

Pinout
Laureate Modbus & Serial Output Transmitter
for Time Interval of Periodic Events

Ordering Guide
Laureate Modbus & Serial Output Transmitter
for Time Interval of Periodic Events
Click on the radio buttons to build a model number with pricing (shown below the Ordering Guide).

Quantity
Transmitter Type	LTM Laureate Transmitter, Modbus or Laurel protocol.	$235
Main Board	6 Standard Main Board.	NC
Power	0 Isolated 85-264 Vac 1 Isolated 12-32 Vac or 10-48 Vdc	NC $30
Relay Output	0 None 2 Isolated Dual Solid State Relays	NC NC
Analog Output	0 None. 1 4-20 mA or 0-10V analog output	NC NC
Input Type	FR Dual-Channel Pulse Input	NC
Accessories	CBL04 RS-232 cable, LTM to computer or USB adapter CBL02 USB to RS-232 cable adapter	$19 $39