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Gurley Precision Instruments VJ User Manual

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Virtual Absolute Interpolating Decoder
USER'S MANUAL
REV 6
Gurley
Precision Instruments
Model VJ
JULY 12, 2016
VJXXXXXXXXN
S.N.
xxxxxxx
514 Fulton Street, Troy, NY 12181 USA
Phone:
Toll free:
Fax:
Email:
(518) 272-6300
(800) 759-1844
(518) 274-0336
encoders@gurley.com

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Summary of Contents for Gurley Precision Instruments VJ

  • Page 1 Model VJ Virtual Absolute Interpolating Decoder USER'S MANUAL REV 6 JULY 12, 2016 VJXXXXXXXXN S.N. xxxxxxx Gurley 514 Fulton Street, Troy, NY 12181 USA Phone: (518) 272-6300 Toll free: (800) 759-1844 Fax: (518) 274-0336 Precision Instruments Email: encoders@gurley.com...

  • Page 2: Specifications

    Overview The model VJ Interpolating Decoder is designed to be used with the Gurley 7700A02048R12U or 7700A01024R12U read heads. The VJ will decode absolute position from a Virtual Absolute disk ( 10 or 11 bits) and interpolate the analog signals to get an additional 8 bits of resolution for a total of 18 or 19 bits.

  • Page 3: Installation

    Figure 1: Board Layout J2 OUTPUT CONNECTOR DIGITAL TEST POINTS ANALOG TEST POINTS -Digital Index (Code track) -Digital Cosine (1X) -Reference -Digital Sine (1X) - Data valid when high -Sine - Interpolated Cosine -Cosine - Interpolated Sine -Index LED D1 J1 INPUT CONNECTOR INSTALLATION Connect a 7700A readhead to connector J1.
  • Page 5 FIGURE 2: Output connector J2 TABLE 1: J2 connector definition NAME DESCRIPTION 5Vdc power input. -SYNC Optional RS422 input . -CLOCK RS422 input, SSI clock. +CLOCK RS422 input, SSI clock CHASSIS Chassis or shield connection power and signal ground +SYNC Optional RS422 input .
  • Page 6 FIGURE 2: SSI timing diagram Tclk wait CLOCK Flag3 Flag2 Flag1 PARITY DATA MSB-1 SYMBOL DESCRIPTION UNITS Tclk Clock period uSec. Clock high time nSec. Clock low time nSec. Clock to Data Valid Monostabe time uSec Wait Time uSec wait FIGURE 3: Timing diagram when using optional SYNC input Tsync SYNC...
  • Page 7 There 7700 read head and disk should be installed according to their manual. It may be necessary to slightly adjust the alignment of the readhead to get the signals in proper phase shown in Figure 5. The Index signal should be at its minimum or maximum level when the cosine signal is at it minimum.

  • Page 8: Data Output Format

    DATA OUTPUT FORMAT Data is output serially with the first bit being status (STA). The status bit is high when virtual absolute position is not known. After a small initial movement the status bit should go low and stay low. The second bit is the MSB of the position word. Following the LSB of the position word are three flags bits.

  • Page 9: Warranty And Return Policy

    WARRANTY AND RETURN POLICY Gurley Precision Instruments (GPI) does not warrant that the hardware will work properly in all environments and applications, and makes no warranty and representation, either implied or expressed, with respect to the quality, performance, merchantability, or fitness for a particular purpose of any software or documentation.

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