Pepper-computer Modular Computers RS485 Manual de usuario descargar pdf (Pagina 302)

100

101

SMART I/O User’s Manual

October 01, 1996

Page 6- 20

Chapter 6 Communications Modules

6.2.6 SSI Operation

With reference to figures 6.2.6.1 and 6.2.6.2, the operation of the SSI inter-

face will be discussed.

• The position of the encoder disk is continuously clocked.

• Position data is ready for conversion by the parallel -> serial converter.

• The controller (SM-SSI) demands the axis angle from the encoder

which starts the SSI clock - the number of clock pulses required is

dependent on the data width (24-bits).

Figure 6.2.6.1: SM-SSI Timing Diagram

m = Stored parallel data T = SSI clock period

td = Delay time for the first clock G0 = LSB of Gray* code

Gn = MSB of Gray* code tm = Monoflop time

Tp = Pause time in SSI clock

* Binary code may also be converted.

1 2 3 4

td tm

Gn Gn - 1 G 1 G 0

m - 1 m m + 1

Clock

Serial Data

Monoflop P/S*

Parallel Data

1 2 ... 297 298 299 300 301 302 303 304 305 306 307 ... 319 320

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Pepper-computer Modular Computers RS485 Manual de usuario Pagina 302

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