THE E7N SERIAL RESOLVER

The E7N SERIAL Resolver is a resolver-based encoder, in which the analog signal produced by a brushless resolver is transformed to digital format by a built-in ratiometric-tracking converter. This new concept and the advanced patented technology of the Resolver's electronic circuitry, provide higher accuracy, increased reliability, higher operating speeds, more flexible counts-per-turn, and a smaller size than optical encoders.

No Optics, MIL-Grade Resolver
There is no optically encoded disc or similar components used in the Resolver. A miniature MIL-grade resolver produces an analog position signal and high-grade electronics inside the same housing transforms this signal to digital format. The resolver is a passive transducer, well known for its ruggedness and reliable performance in hostile industrial environments. The Resolver combines the ruggedness of a resolver with the reliability of solid-state electronics and is designed to operate reliably under severe environmental conditions, such as mechanical shock, vibrations, temperature and humidity changes, oil mist, coolants, and solvents. No broken discs! No disc misalignments! No LED aging!

Serial Protocol and Output Driver
The Serial transmission protocol states that data is sent in packets of 5 bytes. Each byte is preceded by a start bit (0) and followed by a stop bit (1). Each packet is separated in time by 5 ms. The contents of each byte are indicated in the table.

Direction (CW/CCW) Selection
When the direction input on the field interface cable (DIR input) is connected to Vs-, the position will decrement when the shaft is turned CW. When the DIR input is connected to Vs-, the position will increment when the shaft is turned CW.

The 12 VDC power supply has to be cycled in order for the Resolver to change the direction of the increment/decrement counts.

Absolute Position Decoding
The Resolver is an absolute encoder. That is, it keeps track of the exact shaft position, even during a power outage or switching-off the machine. At power-up, the Resolver will pick up the exact shaft position, even if the machine moved during the power outage.

Ratiometric Resolver-to-Digital Converter
The AVG Automation ratiometric-tracking converter is practically immune to electrical noise, voltage, frequency, and temperature variations.