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5.2 SSI
5.2.1 Number of data bits
The parameter Number of data bits defines the number of reserved bits for the
measuring system position. Special bits are not contained in it and will be output after
the data bits.
lower limit
upper limit
Output format:
A synchronous-serial data transmission without tree format is min. 13 bits, or max. 31
bits long. The data transmission begins with the most significant bit (MSB) and
contains the position bits (P) and max. 8 freely programmable SSI special bits (S). The
SSI special bits are added after the LSB position bit. In the default setting the SSI
special bits are programmed to "Logical 0V" and produce, if they can be output,
added "zeros".
Related to the example of 32 clocks, the data can be shifted arbitrarily by the
parameter Number of data bits. The data can be transmitted right-justified or
left-justified, with leading "zeros" and without leading "zeros". Leading "zeros" are
produced if the parameter Number of data bits is programmed larger, as it would
be necessary from the total measuring length.
The parameter Number of data bits under the section SSI represents the
number of output position bits without the SSI special bits!
Example
Measuring system:
Output right-justified
MSB
1
2
0
0
Output left-justified
MSB
Printed in the Federal Republic of Germany
12/09/2019
Resolution: 0,001 mm
Measuring length: 4 m
-->Measuring length in steps: 4 000 000
--> Total measuring length: 22 bits
Code: Binary or Gray
Programmed number of data bits = 24
3 – 24
21
0
– P 2
P 2
Programmed number of data bits = 22
1 – 22
21
0
– P 2
P 2
TR - ELA - BA - DGB - 0022 - 09
13
31
25
26
27
S1
S2
S3
23
24
25
26
27
S1
S2
S3
S4
S5
28
29
30
31
32
S4
S5
S6
S7
S8
28
29
30
31
S6
S7
S8
0
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Page 47 of 55
LSB
LSB
32
0
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