Model LT61QD by Laurel Electronics is a quadrature input transmitter with quadrature input signal conditioner. Standard features include a user scalable 4-20 mA, 0-10V or +/-10V analog output, RS232 or RS485 data I/O, and two 120 mA solid state relays. The unit accepts the A & B quadrature signals from linear encoders and shaft encoders to provide a highly accurate, scaled display of position, length, or angle in engineering units, such as ft, cm or degrees. The A & B quadrature signals are 90° out of phase, and their phase relationship determines whether up counts (+) or down counts (-) are counted. The unit totalizes the counts and then scales the total in software for display and control. A zero index signal, or Z signal, may be added as a third input to the A & B signals as the home position. One, two or four transitions may be counted at a maximum combined rate of 250 kHz and be mathematically scaled for display in engineering units from -999,999 to +999,999. In the event of a power failure, the latest total may be stored in non-volatile memory and can be used as the starting point for counting when power resumes. A built-in isolated 5, 10, or 24 Vdc excitation supply can power sensors. The Modbus protocol is fully supported for data transmission as is the simpler Custom ASCII protocol. Power and all inputs and outputs are mutually isolated. The transmitter snaps onto a 35 mm DIN rail and is only 22.5 mm (0.89 inch) thick. It is certified to CE, RoHS, and ETL / UL standards.
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