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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:
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.
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.
| 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 |
| 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 |
| Environmental | |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -40°C to 85°C |
| 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. |
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