SKF Copperhead Transmitter Unit CMPT CTU 10-33
CTU CAN-bus
Overall Measurement Values
Instruction Manual
Table 10-17: Unit address response
Example:
Using PCANView application to send and receive messages, I sent message 12900110
with data set to 01 0D 00 00. The ID of PCANView (acts like host) is 1 and the CTU is
0x10. This will get Envelope value from CTU.
The bytes 1 and 2 (starting from left most) of the data represent the parameter ID and
bytes 3 and 4 represent the element index.
Figure 10-18: Example of New transmit message
The bit representation (32 bit) of message and response is as the following:
1. Yellow: Extra bits not used
2. Green: FNC (always 0x09)
3. Turquoise: Command (0x48)
4. Pink: RR
5. Blue: Source (1), sender address
6. Red: Destination
The message in bitwise:
1 2 3 4 5 6
00010010100100000000000100010000
Response from CTU in application mode with serial number 0002-001746:
12911001 with 6 data bytes [0x00,0x00,0x3D,0x9A,0xF3,0xC0]
I-- data value -I
1 2 3 4 5 6
00010010100100010001000000000001
0x09 0x48 0xEF 0x01
The bit representation of data value (hex number 3D9AF3C0) is as the following:
00111101100110101111001111000000
S Exponent Fraction
Sign (1 bit): bit position 31.
Exponent (8 bit): bit position 23 to 30.
Fraction (23 bit): bit position 22 to 0.
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