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| | | Measuring Methods | | |
| | | Encoder Outputs | | |
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| | | | | | | | | | | | | | Description | | | | | Signal Type Ordering Code | Signal Type | Available on: | | | | TT | Incremental TTL | TTL, RS422 differential quadrature output | SHG, MHG, | | | | TC | Incremental TTL-DC | TTL, Distance Coded | SHG | | | | TS | Incremental TTL-SP | TTL Single Point | SHG, MAG | | | | VM | Incremental 1 ipApp | 11 Micro Amp | SHG, MHG | | | | VP/VV | Incremental ~IVpp | IVolt Peak to Peak | SHG, MHG | | | | VS | Incremental ~IVpp-SP | 1 Volt Peak to Peak - Single Point | SHG | | | | A2 | Absolute - RS232 | RS232 | SHG | | | | A4 | Absolute - RS485 | RS485 | SHG | | | | AB | Absolute - SSI-Binary | Synchronous Serial Interface - Binary Code | SHG | | | | AF | Absolute - Fanuc | Fanuc Interface Protocol | SHG | | | | AG | Absolute - SSI-Gray | Synchronous Serial Interface - Gray Code | SHG | | | | AS | Absolute - Gray & Parity | Synchronous Serial Interface - Gray Code plus Even Parity Checksum | SHG | | | | | | | | | | | |
| | | Magnasyn Technology Incremental | | |
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| | | Stainless stee cover stri; + | | |
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| | | TT - TTL - Differential Quadrature | | For encoder connections of distances greater than 22m refer TT - TTL Output Signal - Differential Quadrature Newall TT Series Linear encoders provide a differential quadrature output at RS422 TTL levels. The output signals are transmitted via 9-core cable in accordance with the diagram below. The periodic Reference Mark (RM) is synchronised with the A & B signals as shown in the diagram. The distance between two successive edges of the combined pulse trains A and B is one measuring step (resolution). | | |
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| | | General The Newall MAG encoder is comprised of a flexible tape scale which is mounted on a fixed surface of the machine, with or without an optional twin-track backing bar, and a reader head which is fastened to the moving part to be measured, arranged such that it travels in alignment with the scale. The flexible nature of the tape scale makes the encoder ideal for rotary as well as linear applications. For ease of installation, the adhesive side of the tape is attached directly to a machined surface. For applications where the mounting surface is uneven, the tape scale can be attached to an optional twin-track backing bar, supported by stand-offs. A stainless steel cover strip is supplied to protect the encoded tape. The cover strip is attached to the encoded tape by way of its adhesive backing. | | |
| | | As the incremental sensor in the reader head passes over the tape, the magnetic field is converted to an electrical signal, which is sampled by a micro controller. The field between the markers varies sinusoidally, which the micro controller can determine the position of the sensor in relation to each marker. The analogue information is converted into an industry standard differential quadrature signal. Reference Mark - RM One index marker (short lengths of tape containing just one magnetic pole pair) can be fitted in the second track of the optional backing bar. This is detected by the index sensor in the reader head and output as the RM signal. More then one reference mark can be supplied on request. | | |
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| | | | | | | | | | | | Pin | Core | Function | Colour | | | | 1 | »mir™ | | 0»nge | | | | 2 | 7/0I5mm | Channel A | Green | | | | 3 | T»sted Pair | Channel A | Vhcw | | | | 4 | »0I5mm | Channel B | Blue | | | | 5 | T»sted Pair | Channel B | | | | | | »0 25mm | 0V | White | | | | | »oh™ | | Black | | | | ■ | »0I5mm | Channel RM | Violet | | | | 9 | T»sted Pair | Channel RM | Grey | | | | | Screen | | | | | | | | | | | | | |
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| | | Principal of Operation The tape scale is made up of a flexible magnetic rubber strip, sandwiched between a backing strip and a cover strip made from thin stainless steel. The encoded tape contains magnetic markers that are placed at 2mm intervals along the length of the tape. | | |
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| | | NEWALL MEASUREMENT SYSTEMS BEI TECHNOLOGIES, INC. 9 | | |
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