MICRO-EPSILON colorCONTROL MFA, Руководство по эксплуатации

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Page 41
Appendix | Measurement Data Format
colorCONTROL MFA-7/-14/-21/-28
A 5 Measurement Data Format
Each value is transmitted in 3 data bytes (color or additional value) with 18 useful bits each.
Conversion is required to output measured values in the various color spaces via RS422. Other values, such as time-
stamp, dominant wavelength, trigger and status data, are transmitted as 18-bit data words. Conversion is not required in
this case.
Measured value 1:
Preamble Data bits
L-byte 0 0 D5 D4 D3 D2 D1 D0
M-byte 0 1 D11 D10 D9 D8 D7 D6
H-byte 1 0 D17 D16 D15 D14 D13 D12
Measured value 2 ... 168:
Preamble Data bits
L-byte 0 0 D5 D4 D3 D2 D1 D0
M-byte 0 1 D11 D10 D9 D8 D7 D6
H-byte 1 1 D17 D16 D15 D14 D13 D12
Value range for color measurement:
Color values
0
Error
98232
229304 262072
0
2 MB
The measured values (integers from 0 ... 262143) converted from three bytes are then scaled:
Scaled color temperature [K] = raw color temperature
Scaled wavelength [nm] = raw wavelength
Scaled timestamp [s] = raw timestamp / 1000
Scaled color = (raw color value – offset) / factor
All values larger than 262072 are error values and are defined as follows:
Error code Description
262073 Scaling error RS422 interface underflow
262074 Scaling error RS422 interface overflow
262075 Data volume too large for selected baud rate
1
262076 No peak is present.
262077 Peak is before measuring range (MR)
262078 Peak is after measuring range (MR)
262079 Measured value cannot be calculated
1) This error occurs when more data is to be output than can be transmitted with the selected baud rate at the selected measuring
frequency. This can be remedied by:
This can be remedied by:
- changing the baud rate , see A 4.3.1
- reducing the measuring frequency , see A 4.3.3
The sequence for a complete data frame (all 168 signals active) is:
Ch01_Color1 Ch01_Color2 Ch01_Color3 Ch01_Temperature Ch01_Wavelength Ch01_Timestamp
Ch02_Color1 Ch02_Color2 Ch02_Color3 Ch02_Temperature Ch02_Wavelength Ch02_Timestamp
…
Ch28_Color1 Ch28_Color2 Ch28_Color3 Ch28_Temperature Ch28_Wavelength Ch28_Timestamp