Features
- Converts streaming RS232 or RS485 ASCII data to an (isolated), scaled 4-20 mA, 0-10 mA, 0-10V or -10V to +10V analog output.
- Able to retrieve data from long character strings.
- Setup using Laurel's free Instrument Setup Software.
- Accepts Modbus or Custom ASCII protocol commands to set analog output or relay action.
- Includes up to 1/2 hour of technical phone support with screen sharing.
- Serial data rates from 300 to 9600 baud.
- Analog output resolution 0.0015% of span (16 bits), accuracy ±0.02% of span.
- Dual 120 mA solid state relays can respond to readings or to control characters.
- Universal 85-264 Vac / 90-300 Vdc or 10-48 Vdc / 12-32 Vac power.
- Operating temperature from -40°C to 70°C (-40°F to 158°F)
- DIN rail mount housing only 22.5 mm wide, detachable screw-clamp connectors.
The LTS serial data input, analog output transmitter accepts streaming RS232 or RS485 serial data ASCII strings from an external device, like a scale, at rates up to 9600 baud. It converts this data to an (isolated), scalable 4-20 mA, 0-20 mA, 0-10V or -10V to +10V analog output. Two solid state relays are standard and can respond to readings or to received control characters. The LTS also accepts serial commands via the Modbus RTU or Laurel Custom ASCII protocols to set the analog output or relay state. The unit is housed in a transmitter case which is only 22.5 mm (0.89") thick and fits on a 35 mm DIN rail. Depending on the model, it can be powered by AC (85-264 Vac) or DC (10-48 Vdc).
Standard LTS features include:
- Streaming serial data input, RS232 or RS485. The data to be converted to analog is specified using Laurel's free Instrument Setup Software. The user-selectable "Remote C" mode allows the number of characters in the data, preceding the data and following the data to be specified. In all cases, it is essential to know know the what ASCII characters are contained in each serial data transmission.
- Commands via the Modbus RTU, Modbus ASCII or Custom ASCII protocols. For details, please or Modbus and Custom ASCII manuals. These commands can be used to set the analog output and the state of the unit's two relays. Modbus implementation is fully compliant with Modbus over Serial Line Specification V1.0 (2002) for operation, with up to 247 digital addresses.
- 4-20 mA, 0-20 mA, 0-10V or -10V to +10V analog transmitter output, (isolated), jumper-selectable and user scalable. All selections provide 16-bit (0.0015%) resolution of output span and 0.02% output accuracy of readings from -999,999 to +999,999 counts. Output isolation from signal and power grounds eliminates potential ground loops.
- Dual solid state relays for control or alarm, (isolated). Rated 120 mA at 140 Vac or 180 Vdc. The relays can respond to digital readings or to received control characters, or be commanded via the Modbus protocol or Custom ASCII protocol.
- Transmitter programming 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 cables from the transmitters to a PC com port are available from Laurel (P/N CBL02 and CBL04).
- Up to 30 minutes of technical phone support. Programming requires an understanding of the ASCII characters in your streamed data. Setup assistance using screen sharing is built into the price of the LTS.
All signal conditioner board ranges are factory-calibrated, with calibration factors for each range securely stored in an onboard EEPROM. These factors can be scaled via software to accommodate external shunts, enabling field replacement of signal conditioner boards without necessitating recalibration of the associated transmitter. For optimal accuracy, factory recalibration is recommended annually. All Laurel Electronics instruments undergo factory calibration using the industry-leading Fluke calibrators, which are recalibrated yearly and certified traceable to national standards, ensuring the highest level of precision and reliability.
Programmable Streaming Input Modes
Six data conversion modes are user selectable to receive and process streaming data. The number of characters to be processed can be up to 7, including 6 digits and a decimal point. Include leading zeros, like 00300.0. The LTS is not plug and play. The format of the strings being received must be known in advance, including non-printing control characters. If you do not know the string format, contact tech support of the sending device's manufacturer, or use a terminal emulator program like HyperTerminal, PuTTY or RealTerm to view the actual transmitted characters.
- Remote S processes single values without a digital address. An alarm character is optional.
- Remote A processes single values with a digital address. An alarm character is optional.
- Remote 1 processes the 1st of up to 4 readings embedded in a Laureate transmission.
- Remote 2 processes the 2nd of up to 4 readings embedded in a Laureate transmission.
- Remote 3 processes the 3rd of up to 4 readings embedded in a Laureate transmission.
- Remote 4 processes the 4th of up to 4 readings embedded in a Laureate transmission.
- Remote C can process readings embedden in long ASCII strings. Specify the start character at the beginning of the string, the number of characters following the start chracter to be ignored, the number of characters to be processed following the lastignored character, and the stop character at the end of the string.
Programmable Command Modes
A Master, which can be a PC, PLC or other programmable device, can send digital values to an LTS transmitter to cause it to output specifc analog signals and actuate alarms. Ether the Modbus RTU protocol or Laurel's simpler Customer ASCII protocol can be used for commands. Both support digital addressing.
- The Modbus RTU protocol uses Function Code FC10, Holding Register 006C, and data as 4 hexadecimal bytes.
- The Custom ASCII protocol uses the string *1K followed by the decimal reading and by <CR>
Connecting Laureate LTS Transmitters to a Local Area Network (LAN)
Up to 30 Laureate LTS Transmitters and/or Digital Panel Meters can be configured for RS485 and daisy-chained to an LTS Transmitter using Laurel’s High Speed Ethernet-to-RS485 converter board for seamless LAN integration. Alternatively, Laurel LTE series Ethernet transmitters can connect directly to a LAN via an Ethernet cable. Setup for both configurations is streamlined using Laurel’s free Instrument Setup Software, which simplifies node discovery and transmitter configuration.
Flexible Communication Options for LTS Transmitters
Laureate Transmitters can be equipped with Laurel communication boards to support various interfaces and protocols. These include serial interfaces with ASCII or Modbus RTU protocols, and Ethernet interfaces with web access, ASCII, or Modbus TCP/IP protocols, ensuring versatile connectivity for your commercial applications.
Laureate LTS Serial Input, Analog Output, DIN Rail Transmitter
| Serial Data Input (standard) | ||||
|---|---|---|---|---|
| Signal Types | RS232 or RS485 (half or full duplex), jumper selectable | |||
| Data Rates | 300, 600, 1200, 2400, 4800, 9600, 19200 baud | |||
| Output Isolation | 250V rms working, 2.3 kV rms per 1 min test | |||
| Serial Protocols | Modbus RTU, Modbus ASCII, Custom ASCII | |||
| Modbus Compliance | Modbus over Serial Line Specification V1.0 (2002) | |||
| RS232/485 Connector | Screw terminals for easy daisy chaining | |||
| Digital Addresses | 247 for Modbus, 31 for Laurel ASCII | |||
| Analog Output (standard) | ||||
| Output Levels | 4-20 mA, 0-20 mA, 0-10 Vdc, -10V to +10V (user selectable) | |||
| Compliance at 20 mA | 10V (0-500Ω load) | |||
| Compliance at 10V | 2 mA (5 kΩ or higher load ) | |||
| Output Resolution | 16 bits (65,536 steps) | |||
| Output Accuracy | ±0.02% of output span | |||
| Output Update Rate | Determined by input data rate, max 10/sec | |||
| Output Isolation | 250V rms working, 2.3 kV rms per 1 minute test | |||
| Dual Relay Output (standard) | ||||
| Relay Type | Two solid state relays, SPST, normally open, Form A | |||
| Load Rating | 120 mA at 140 Vac or 180 Vdc | |||
| Power Input | ||||
| Standard Power | 85-264 Vac or 90-300 Vdc | |||
| Low Power Option | 10-48 Vdc or 12-32 Vac | |||
| Power Frequency | DC or 47-63 Hz | |||
| Power Isolation | 250V rms working, 2.3 kV rms per 1 min test | |||
| Power Consumption | 1.5W typical at 24V | |||
| Environmental | ||||
| Operating Temperature | -40°C to 70°C (-40°F to 158°F) | |||
| Storage Temperature | -40°C to 85°C (-40°F to 185°F) | |||
| Relative Humidity | 95% at 40°C, non-condensing | |||
| Cooling Required | Mount transmitters with ventilation holes at top and bottom. Leave 6 mm (1/4”) between transmitters, or force air with a fan. | |||
| Mechanical | ||||
| Dimensions | 129 x 104 x 22.5 mm case | |||
| Mounting | 35 mm rail per DIN EN 50022 | |||
| Electrical Connections | Plug-in screw-clamp connectors | |||
| General | ||||
| Programming | Utilize Laurel's free Instrument Setup Software, which runs on a PC under MS Windows. | |||
| Security | Lockout options available using Laurel's free Instrument Setup Software. | |||
| Warranty | 3 years parts & labor | |||
| Recalibration: All ranges are calibrated at the factory. Recalibration is recommended every 12 months. | ||||
Pinout
Free Instrument Setup Software for Series 2 Laureates
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| 1/8 DIN Digital Panel Meters | DIN Rail Transmitters |
Free Downloadable Windows-based Instrument Setup (IS) software (Data Interface Board Required) for use with our programmable Digital Panel Meters, Scale Meters, Counters, Timers, Remote Displays, and Transmitters, are an easy method to set up Laureate 1/8 DIN digital panel meters, counters, timers, remote displays, and DIN-rail transmitters, as explained in the Instrument Setup Software Manual. Laureate 1/8 DIN instruments can also be set up from the front panel, as explained in their respective Owners Manuals. Instrument Setup software is of benefit whether or not the PC is connected to the instrument.
- When the PC is connected to the instrument, Instrument Setup software can retrieve the setup file from the instrument or open a default setup file or previously saved setup file from disk View Setup, then provides graphical user interface (GUI) screens with pull-down menus applicable to input, display, scaling, filtering, alarms, communications, analog output, and front panel lockouts. Fields that are not applicable to the instrument as configured are either left out or grayed out. Clicking on any item will bring up a detailed Help screen for that item. After editing, the setup file can be downloaded, uploaded to the instrument, or saved to a disk. The same setup file can then be downloaded into multiple instruments.
- When the PC is not connected to the instrument, the above GUI screens can be used to set up a virtual instrument. The setup file can then be saved to disk. Switching toView Menu then brings up a screen with the required front panel programming steps. This view can be printed out for use at the instrument site and to serve as a hard copy record.
Download Free Instrument Setup Software
Installation
Set User Account Control (UAC) of MS Windows to "Never notifiy me" so that Instrument Setup Software can create directories. The UAC change screen can be reached as follows:
- Under Windows 7, click on the Windows Start button in the lower left of the desktop and enter "UAC" in the search field.
- Under Windows 8, navigate to Control Panel, then to the "User Accounts and Family Safety" section, and click on "Change User Account Control Settings."
- Under Windows 10, click on the Windows Start button in the lower left of the desktop, then on "Settings", and enter "UAC" in the search field.
- Reboot your computer for the changed UAC setting to take effect.
RJ11-to-DB9 cable with rear view of DB9 connector to PC
RS232 cable, meter to PC, P/N CBL01
Laureate 1/8 DIN Laureate instruments must be equipped with a serial communications board and be connected to the computer via a serial communications cable. The connection can be via RS232, RS485, USB or Ethernet. Following setup, the serial communications board may be removed from the instrument if desired. The wiring of the RS232 cable is illustrated above with end views of the two connectors.
Laureate LT Series transmitters come standard with a 3-wire serial interface, which can be jumpered for RS232 or RS485.
Laureate LTE Series transmitters come standard with an Ethernet interface.
Meter Setup Screens
Click on any of the reduced screens below for a full-size screen view, then click on the Back button of your browser to return to this page. The screens examples below are for a fully-loaded Series 2 Digital Panel Meter (DPM), which is connected to the PC via RS232. If the meter is a Series 1 meter (pre-2007), this is sensed by the software, and somewhat different screens are brought up. Please see Series 1 setup screens.
Welcome Screen
From the computer desktop, click on Start > Programs > IS2 > IS2. Or click on the IS icon on your desktop. This splash screen will be displayed for three seconds. The software revision number is in the lower right.
Communications Selection Screen
Specify your desired communication protocol and the serial communications bus type, which should match the jumper setup of the instrument. Select None if the PC is not connected to the instrument.
Establish Communications Screen
If you selected RS-232, you will be asked to specify the PC Com Port and Baud Rate, which should match the jumper setup of the instrument. Click on Establish. With the right settings, the Communications Established field will light up in green, and the Meter Type will be recognized. If so, click onMain Menu.
Main Menu Screen
Click on File > Default Setup to retrieve the default setup file from disk for your type of meter. Click on File > Open Setupto retrieve a previously saved setup file from disk or on File > Save Setup to save your edited setup file to disk. Click onDPM > Get Setup to retrieve the setup file from your meter or on DPM > Put Setup to download your edited setup file into the meter.
DPM Input + Display Setup Screen
From the Main Menu, click on View > Setup, then on theInput+Display tab. You can now specify the meter hardware, signal type, display mode, and functions of control inputs A and B. Clicking on any item brings up a pull-down menu with the available choices.
DPM Scaling Setup Screen
Click on the Scaling tab, which provides three scaling methods to relate the signal to the displayed reading: 1) Scale and Offset method, 2) Coordinates of two points method, and 3) Reading Coordinates of Two Points method. The last method uses actual high and low signals, and the computer will prompt you.
DPM Filter Setup Screen
Click on the Filter tab, which allows you to specify the digital filter time constant (if any), the adaptive filter threshold, and whether Peak / Valley values are filtered or unfiltered. As for all setup screens, clicking on the F1 key while an item is highlighted brings up a Help screen for that item, as illustrated.
DPM Relay Alarms Setup Screen
Click on the Relay Alarms tab, which allows you to set up Alarms 1 and 2 for the optional dual relay output board. Clicking on any of the four numeric fields changes these to green and brings up a special field to enter the desired numeric value, which is tied to the displayed reading.
DPM Communications Setup Screen
Click on the Communications tab so set up serial communications. In particular, you can special the Serial Protocol and the meter address if multiple meters are to be addressed on the same serial data line.
DPM Analog Output Setup Screen
Click on the Analog Out tab so set up the optional analog output board. Three output ranges are selectable, the endpoints of which can be tied to user-specified High and Low readings.
DPM Lockouts Setup Screen
Click on the Lockouts tab to check off menu items which will no longer be accessible from the front panel of the meter. This will simplify meter operation and prevent unintended setup changes.
Meter Setup Utilities
DPM Front Panel Setup Screen
As an aid to programming the meter from the front panel when a serial connection is not available, you can return to the Main Menu and click on View > Menu. The required sequence of front panel screens will then be displayed. Click on any step in the sequence for the meaning of each digit, as illustrated for the FILtEr step. For a hardcopy, simply press on Print.
DPM Jumper Setup Screen
Specify your desired communication protocol and the serial communications bus type, which should match the jumper setup of the instrument. Select None if the PC is not connected to the instrument.
DPM Jumper Setup Screens
Click on any of the displayed plug-in boards, and you will be presented with the jumper positions and electrical connections for your selected board. This minimizes the need to refer to the printed manual.
DPM Commands Screen
This page allows you set up external input, serial communications, an analog output proportional to the display (optional), and lockouts for Laureate digital counters. The grayed out area at the top right of the screen applies to Laureate remote displays.
Graphical Output Screens (not available with Ethernet)
From the Main Menu, click on Readings if your PC is connected to the meter. A pull-down menu then offers three choices: List, Plot and Graph.
- List presents the latest readings in a 20-row by 10-column table. Press Pause at any time to freeze the display. This is one method to capture peak readings.
- Plot generates a plot of readings vs. time in seconds. It effectively turns the DPM-PC combination into a printing digital oscilloscope.
- Graph generates a histogram where the horizontal axis is the reading and the vertical axis is the number of occurrences of readings. The display continually resizes itself as the number of readings increases.
DPM Calibration Screens
Click on the Scaling tab, which provides three scalClick on the Scaling tab, which provides three scaling methods to relate the signal to the displayed reading: 1) Scale and Offset method, 2) Coordinates of two points method, and 3) Reading Coordinates of Two Points method. The last method uses actual high and low signals, and the computer will prompt you.
Frequency Meter Calibration Screen
Calibration of the quartz crystal of the Laureate frequency meter requires the input of a known frequency from a calibrator. Apply the frequency, then enter the frequency in Hertz. Calibration will be automatic, with storage of the calibration factor stored in non-volatile memory.
Dimensions
Dimensioned CAD assembly drawings in EPRT, STEP, x_t, .dwg, pdf file formats: Laureate-transmitter-case.zip (zipping prevents browser from opening CAD files as text files).
CLB02
USB-to-RS232 Adapter Cable
CBL02
$47.00
CBL04
RS232 Cable for LT Transmitters
CBL04
$47.00
