Laurel Electronics LTE SERIES TRANSMITTERS PULSE INPUT - Manual (Page 5)

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4. PRODUCT OVERVIEW
LTE Series counter transmitters duplicate the signal conditioning and signal processing features
of our 1/8 DIN panel-mounted counters for exceptional performance at high read rates. Signal
sources are accommodated by three signal conditioner boards, which are the same as for our
panel-mounted counters:
• Dual-channel pulse input signal conditioner (for frequency, rate, total, arithmetic combina-
tions of two channels, stopwatch, timer, phase angle, duty cycle).
• Voltage-to-frequency signal conditioner (for rate or total from 4-20 mA, 0-1 mA or 0-10V
process signals).
• Quadrature signal conditioner (for position or rate from quadrature encoder signals).
Extended software capabilities are provided by an “Extended” main board, which needs to be
specified at the time of order. Please see our Ordering Guide on page 2 and the signal conditioner
sections of this manual.
An isolated 4-20 mA, 0-20 mA or 0-10V output is standard. This output is generated by an ultra-
linear 16-bit digital to analog converter which tracks an internal linearized digital reading.
Isolated Ethernet communications are standard via an RJ45 connector for a 10/100BaseT
interface. Four serial communication protocols are understood by our transmitters: Modbus TCP,
Modbus RTU, Modbus ASCII, and Custom ASCII (a simpler protocol than Modbus).
An isolated transducer excitation output is standard. Three output levels are jumper selectable:
5V at 100 mA, 10V at 120 mA, or 24V at 50 mA. The factory default setting is 10V.
Two isolated solid state relays are standard. These are rated 120 mA at 140 Vac or 180 Vdc.
Power over Ethernet (PoE) operation is jumper selectable with the DC power option (10-48 Vdc).
Isolation to 250V rms is provided for power, signal input, analog output, relay outputs, and com-
munications. Isolation adds safety and avoids possible ground loops. The transducer excitation
output is isolated to ±50V from signal ground.
Internal jumpers are used to select the signal range and excitation level. The transmitter
configuration is specified by the model number on the transmitter label. A user can reconfigure
the transmitter by opening the case and moving jumpers.
Transmitter scaling is via serial connection to a PC using MS Windows based Instrument Setup
Software, which can be downloaded at no charge.