Absolute Value Encoder Communication Interface Design Based on SSI Protocol

Abstract

In terms of absolute value encoder applications, SSI communication protocol, as an earlier implementation of communication protocol, has been widely used recently. Many companies, including both domestic and overseas, have introduced encoder communication interfaces with the SSI absolute value. In this paper, based on the features of SSI protocol communication, we propose a low cost of SSI protocol communication interface design scheme for the absolute value encoder whose output is asynchronous or parallel. The experiment shows that this kind of communication interface is stable, reliable and makes the absolute value encoder with asynchronous serial or parallel output interface meet the SSI protocol specification of communication function.

Two-dimensional Moiré fringe linear grating ruler with spatial multiplexing

“…The spatial overlapping angle of the straight grid line grating and the straight grid line grating is 0°, forming a visually black and white two-dimensional periodic distribution, as shown in Figure 3(a). In use, the grating scale is observed and detected macroscopically, which is equivalent to Figure 2 ( 1 ) Currently, the angle between the Moiré fringe and the horizontal axis is 0°, which is a horizontal Moiré fringe, and the width of the Moiré fringe is Ms [5][6][7] 𝑴 𝒔 ( 3 ) Currently, the angle between Moiré fringes and the horizontal axis is 90°, which is vertical fringes. The two gratings move relative to each other for one grating pitch, and the vertical Moiré fringes roll left and right for one vertical Moiré fringe width.…”

“…2D Moiré fringes; (a) Overlapped grating pattern; (b) 2D Moiré fringes. Let cs= Wdx / Wm, and Wm > Wdx, if 𝐜𝐨𝐬 𝜽 𝒄𝒔( 1 ) Currently, the angle between the Moiré fringe and the horizontal axis is 0°, which is a horizontal Moiré fringe, and the width of the Moiré fringe is Ms[5][6][7]…”