Sony MJ620 - Using the Reference Point; Principles of Reference Point Output

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(E) 9

MJ620

The one-cycle reference point is one of the four

points above and is determined by the

reference point gate logical product.

Reference point

gate signal

Reference point

output

When both mode switches 1-1 and 1-2 are on

COS signal

SIN signal

MODE1

ON ON

OFF ON

Approx. 135

ON OFF

Approx. 225

Approx. 315

OFF OFF

Approx. 45

3-4. Using the reference point

In the MJ620, the reference point prerecorded in the encoder can be input from the encoder

signal input connector as an analog reference point gate signal, and the reference point

signals can be output in synchronization with the A/B phase signals.

3-4-1. Principles of reference point output

The MJ620 detect the one-cycle reference points from the SIN and COS signals input from

the encoder. These one-cycle reference points are synchronized with the A/B phase signals

that are output and are located at approximately the 45d, 135d, 225d, and 315d positions as

viewed from the SIN signal of the encoder according to the setting made at mode switches

1-1 and 1-2 (reference point position 1 and 2 switches).