IC-MN datasheet(39/62 Pages) ICHAUS

39 / 62 page

iC-MN 25-BIT NONIUS ENCODER

WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION

Rev F2, Page 39/62

Output Data Length

The output bit count is derived from the parameters

DL_ST, M2S and DL_MT. In accordance with the se-

lected protocol two additional bits for the error and warn-

ing messages are always transmitted.

The output bit length for singleturn data can be set

independent of the internal converter resolution. For

bit lengths which exceed the internal word length the

data following the LSB is zero filled. If enabled by M2S

multiturn data is always transmitted before singleturn

data.

DL_ST

Addr. 0x3E; bit 4:0

Code

Bit count

0x00

8 bit +2 bit for E/W

...

0x05

13 bit +2 bit for E/W

...

0x11

25 bit +2 bit for E/W

Bit counts listed below are valid only for multiturn

synchronization mode (see P. 30)

0x12

26 bit +2 bit for E/W

...

0x19

33 bit +2 bit for E/W

0x1A

39 bit +2 bit for E/W

Table 59: ST Data length

M2S

Addr. 0x3F; bit 2:1

Code

Function

No output

MT data output of lowest 4 bits

MT data output of lowest 8 bits

Complete output, MT bit count following DL_MT

Table 60: MT Data output

Output Options

In BiSS C protocol only binary coded data are permit-

ted.

GRAY_SCD

Addr. 0x3F; bit 7

Code

Data format

Binary coded

not permitted

Table 61: Data format for BiSS C (NBISS = 0)

The code direction of the output data word can be al-

tered using pin DIR or register DIR. Both signals are

EXOR-gated and together comprise the internal direc-

tion of rotation signal.

DIR

Addr. 0x3D; bit 6

Code

Direction of rotation

Not inverted

Inverted

Table 62: Inversion of code direction

For reasons of data security iC-MN provides fixed CRC

polynomials (see Table 63). The data security com-

prised the position data (MT + ST) and the error and

warning bit. The CRC value is transmitted inversely.

The CRC start value can be freely selected, thus en-

abling a PLC to clearly allocate data to the source (for

safety applications). Register communication can be

optionally blocked by parameter NC_BiSS.

Data

Channel

CRC

HEX Code

Polynomial

Calculation

Start Value

SCD

0x43

x6+x1+x0

see CID_SCD

CDM, CDS

0x13

x4+x1+x0

0x0

Table 63: BiSS CRC polynomials

CID_SCD

Addr. 0x4C; bit 7:4

Code

CRC start value SCD

0x00

. . .

CID_SCD

0x0F

Table 64: CRC start value for SCD

NC_BISS

Addr. 0x43; bit 5

Code

Function

BiSS C register communication enabled

Communication disable

(no execution of commands, no access to RAM or

EEPROM

Notes

If the device setup and a set communication disable

NC_BiSS are to be stored to the EEPROM, the

preset function can be triggered at pin PRES.

Table 65: Communication disable

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