Gurley Precision Instruments VJ Скачать руководство пользователя страница 3

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Figure 1: Board Layout

GND

VCC

-Reference

-Sine

-Cosine

-Index

- Interpolated Sine

- Interpolated Cosine

-Digital Index (Code track)

-Digital Cosine (1X)

-Digital Sine (1X)

Data valid when high

GND

J2 OUTPUT CONNECTOR

J1 INPUT CONNECTOR

LED D1

DIGITAL TEST POINTS

ANALOG TEST POINTS

INSTALLATION

Connect a 7700A readhead to connector J1. Power and RS-422 serial interface is
provided by J2. See Figure 2 and Table 1.

Содержание VJ

Страница 1: ...2181 USA Phone 518 272 6300 Toll free 800 759 1844 Fax 518 274 0336 Email encoders gurley com Gurley Precision Instruments VJXXXXXXXXN S N xxxxxxx Model VJ Virtual Absolute Interpolating Decoder USER...

Страница 2: ...interface can be used as standard SSI with a single input CLK signal differential pair and single output DATA signal differential pair There is an optional Sync input differential pair that allows for...

Страница 3: ...Z Digital Index Code track Y Digital Cosine 1X X Digital Sine 1X S Data valid when high GND J2 OUTPUT CONNECTOR J1 INPUT CONNECTOR LED D1 DIGITAL TEST POINTS ANALOG TEST POINTS INSTALLATION Connect a...

Страница 4: ...4...

Страница 5: ...or shield connection 6 GND power and signal ground 7 SYNC Optional RS422 input 8 DATA RS422 output SSI Data 9 DATA RS422 output SSI Data The serial interface timing is shown in figures 2 and 3 Figure...

Страница 6: ...5 uSec Twait Wait Time 0 uSec Tch Tcl Clock high time 120 nSec Tcl Clock low time 120 nSec FIGURE 3 Timing diagram when using optional SYNC input STA DMSB DMSB 1 PARITY Flag1 Flag2 Flag3 DLSB CLOCK DA...

Страница 7: ...the adjustment is to slightly move readhead until the LED D1 remains lit without blinking when slowly rotating the disk A better method is to monitor the voltage on Testpoint U and adjust the read hea...

Страница 8: ...the Index signal transitions are occurring in the wrong place Flag 3 goes high when a quadrature error is detected This occurs if SIN and COS states change by more than 90 degrees between a sample A f...

Страница 9: ...shipping is specifically excluded from warranty This warranty is exclusive and GPI makes no other representation of any other kind expressed or implied with respect to the product including its merch...