iC-MN 25-BIT NONIUS ENCODER
WITH 3-CH. SAMPLING 13-BIT Sin/D INTERPOLATION
Rev D1, Page 39/59
Output Data Length
The code direction of the output data word can be al-
The output bit count is derived from the parameters tered using pin DIR or register DIR. Both signals are
DL_ST, M2S and DL_MT. In accordance with the se- EXOR-gated and together comprise the internal direc-
lected protocol two additional bits for the error and tion of rotation signal.
warning messages are always transmitted.
DIR
Code
0
Addr. 0x3D; bit 6
The output bit length for singleturn data can be set in-
dependent 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 mul-
titurn data is always transmitted before singleturn data.
Direction of rotation
Not inverted
Inverted
1
Table 62: Inversion of code direction
DL_ST
Code
0x00
...
Addr. 0x3E; bit 4:0
Bit count
For reasons of data security iC-MN provides fixed CRC
polynomials (see Table 63). The CRC start value can
be freely selected, thus enabling a PLC to clearly allo-
cate data to the source (for safety applications). Reg-
ister communication can be optionally blocked by pa-
rameter NC_BiSS.
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)
Data
Channel
CRC
HEX Code
Polynomial
Calculation
Start Value
0x12
...
26 bit +2 bit for E/W
...
SCD
0x43
x6+x1+x0
x4+x1+x0
see CID_SCD
0x0
CDM, CDS 0x13
0x19
0x1A
33 bit +2 bit for E/W
39 bit +2 bit for E/W
Table 63: BiSS CRC polynomials
Table 59: ST Data length
CID_SCD
Code
0x00
Addr. 0x4C; bit 7:4
CRC start value SCD
M2S
Code
00
Addr. 0x3F; bit 2:1
Function
. . .
CID_SCD
No output
0x0F
01
MT data output of lowest 4 bits
MT data output of lowest 8 bits
Complete output, MT bit count following DL_MT
10
Table 64: CRC start value for SCD
11
NC_BISS
Addr. 0x43; bit 2
Function
Table 60: MT Data output
Code
0
1
BiSS C register communication enabled
Output Options
Communication disable
(no execution of commands, no access to RAM or
EEPROM
The Gray or binary code format option covers the sin-
glecycle word in its entirety (MT and ST data); only
filled in zeros and the error and warning bits remain
unaltered.
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.
GRAY_SCD
Addr. 0x3F; bit 7
Data format
Table 65: Communication disable
Code
0
1
Binary coded
Gray coded
Table 61: Data format (covers MT and ST data)
ICHAUS [ IC-HAUS GMBH ]
