SMART I/O User’s Manual | Chapter 6 Communications Modules | |||
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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
•The controller
Figure 6.2.6.1: SM-SSI Timing Diagram
1 2
T
Clock
td
Serial Data
GnGn - 1
Monoflop P/S*
m
Parallel Data
m - 1 | m | m + 1 |
m = Stored parallel data
td = Delay time for the first clock Gn = MSB of Gray* code
Tp = Pause time in SSI clock
* Binary code may also be converted.
34
Tp
tm
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| G 1 | G 0 |
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T= SSI clock period
G0 = LSB of Gray* code tm = Monoflop time
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Page | 6- 20 | ©1996 PEP Modular Computers GmbH | October 01, 1996 |
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