Time Interval of Periodic Events
Modbus or Laurel ASCII Protocol Serial I/O Transmitter
From
from 1 µs to 199.999 s. Resolution to 0.2 µs.
DIN Rail mounted, digitally
programmable.
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 µs to 199.999
s.
- Transmitted 6-digit decimal reading.
- Resolution to 0.2 µs.
-
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.
- Isolated 5, 10 or 15V dc excitation
output to power transducers.
- DIN rail mount package only 22.5 mm thick.
- Detachable screw clamp plug connectors.
- Easy setup using PC-based Instrument Setup Software.
- Optional dual solid state relays for alarm or control.
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Description
 Average
Time of Periodic Events
The
Laureate TM Series serial output transmitter for periodic time events can transmit pulse width or time delay between
individual pulses to a resolution of 0.2 µs. It can also display average pulse width or average time delay between multiple
pulses. Selectable full-scale ranges go from 0.099999 sec with 0.2 µs
resolution (after averaging) to 199.999 sec with 1 ms resolution.
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.
 Universal Signal
Conditioner
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 isolated 5V, 10V or 15V dc
excitation supply can power proximity switches and other sensors, and eliminate the need
for an external power supply.
Serial Data I/O & Programming
Laureate TM
Series transmitters send data as a
serial digital signal. RS485 or RS232
signal levels are jumper selectable and
can each be associated with either the
Modbus protocol or Laurel’s simpler
Laurel ASCII protocol.
-
Modbus protocol operation is
fully compliant with the Modbus Over
Serial Line Specification V1.0
(2002) for 2-wire, half-duplex
connection. This includes RTU or
ASCII modes, addressing of up to 32
devices per RS485 line without a
repeater, and up to 247 digital
addresses. Modbus operation allows
devices by different manufacturers
to be connected in parallel and be
addressed using the same protocol.
-
Laurel’s 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’s datalogging
software.
Transmitter programming is via the
unit's three-terminal serial port using
PC-based
Instrument
Setup Software. This software can be
downloaded from this website at no
charge. The required transmitter-to-PC
interface cable is available from Laurel
(P/N CBL03). Laurel's serial output
transmitters and meters can also be part
of PC-based data logging systems using
Laurel's
Datalogging Software, which operates
under the Laurel ASCII Protocol. A
single software command switches between
the Modbus and Laurel ASCII Protocols.
Transmitter Options
Options
include dual solid state relays for
local alarm or control and an isolated
4-20 mA or 10V (selectable) analog
output, effectively providing a
linearized analog transmitter output
that tracks the reading that would be
transmitted digitally. The analog output
provides 12-bit (4096 step) resolution
of the output span and is ultra-linear
to within one bit. Its accuracy is
±0.05% of span for all signal types,
except for AC rms, where accuracy is
±0.1%. Output isolation from signal and
power grounds is provided by a separate
on-board power supply, which can drive
20 mA into a 500 ohm load for 10V
compliance. Output isolation eliminates
problems caused by ground loops.
DIN Rail Mounting
Laureate
transmitters are housed in a 35 mm DIN
rail case that is only 22.5 mm (0.89")
thick. Signal connections are via
detachable screw clamp plug connectors.
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Specifications
Laureate Serial I/O Transmitter
for Periodic Timer Events
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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 ±2 ppm.
±1 ppm/°C (typ)
±5 ppm/year |
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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 |
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Resolution |
|
0 - 199.999 s
0 - 99.9999 s
0 - 9.99999 s
0 - .999999 s
0 - .099999 s
|
1
ms
100 µs
10 µs
1 µs
0.2 µs (after averaging) |
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Serial I/O (standard) |
Signal levels
Data Rates
Output Isolation
Serial Protocols
Devices on RS-485 Line
Modbus Addresses
Modbus Modes
Modbus Compliance |
RS485 (default) or RS232 (jumper selectable)
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) |
Jumper Selection 1
Jumper Selection 2
Jumper Selection 3 |
10V @ 60 mA, isolated to 50V from signal ground
5V @ 50 mA, isolated to 50V from signal ground
15V @ 60 mA, non-isolated |
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Dual Relay Output (optional) |
Relay Type
Load rating |
Two solid state relays, SPST, normally open,
Form A
120 mA at 130 Vac or 170 Vdc, 28 ohms series resistance. |
|
Analog Output (optional) |
Output Levels
Compliance, 4-20 mA
Compliance, 0-10V
Output Resolution
Output Accuracy
Output Isolation |
0-20 mA, 4-20 mA or 0-10 Vdc (selectable)
10V ( 0-500 ohm load )
2 mA ( 5 kOhm load )
12 bits (4,096 steps)
±0.05% of output span
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 |
95-240V AC ±10% or 90-300V DC
12-30V AC or 10-48V DC
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 |
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Typical Applications |
Time Interval Mode for Time Delay |
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For periodic pulses applied to A and B channels, time
delays can be measured down to 0.2 µs resolution from the rising or falling edge of A to
the rising or falling edge of B (selectable).
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Time Interval Mode for Pulse Width |
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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.
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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 µs is
feasible. |
Instrumenting a Pulsed Laser System |
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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.
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Pinout
Laureate Serial Output Transmitter
for Periodic Timer Events
(shown with optional analog output
and dual relay
output)
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Transmitter
Powering a Single Sensor
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Transmitter
Powering Two Sensors |
Transmitter with Active or Passive Sensors |
Ordering
Guide
Modbus or Laurel ASCII Protocol Serial I/O Transmitter,
Time Interval of Periodic Events
Create a
model number in this format: TM6020FR. This example calls out a
Modbus output transmitter, Standard main board, 95-240
Vac power, isolated dual solid state relays, no analog output, and
dual channel pulse input signal conditioner. Includes plug-in screw
clamp
connectors.
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Transmitter
Type |
TM Laureate Transmitter, Modbus or Laurel
protocol. |
$210 |
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Main
Board |
6 Standard Main Board. |
NC |
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Power |
0 Isolated 95-240 Vac & 90-300 Vdc
1 Isolated 12-30 Vac & 10-48 Vdc. |
NC
$30 |
Setpoint
Output |
0 None.
2 Isolated Dual Solid State Relays. |
NC
$30 |
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Analog
Output |
0 None.
1 4-20 mA or 0-10V analog output. |
NC
$25 |
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Input
Type |
FR Dual-Channel Pulse Input.
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NC |
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Accessories |
CBL03 RS-232 cable, TM to computer.
CBL02 USB to RS-232 cable adapter. |
$19
$39 |
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Order from
distributors for shipment to USA or Canada. |
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Order online for
international shipment. |
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