Campbell Scientific SDM-CAN Datalogger to CANbus Interface - Manual (Page 68)

Appendix D. Examples of CAN Data Frames and Data Encoding and Decoding
40bit data frame with one 32bit IEEE floating point value LSByte first
Rxed Bit order within bytes 87654321 87654321 87654321 87654321 87654321
Rxed Byte order Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
Values A
Bit order within values 8 1 16 9 24 17 32 25
Value byte order Mantisa Exponent
Start bit (parameter 09:) RH ref 40 33 32 25 24 17 16 9 8 1
Start bit (parameter 09:) LH ref 1 8 9 16 17 24 25 32 33 40
Start bit (parameter 09:) Right Hand reference.
1: SDM-CAN (P118)
1: 0
SDM Address
2: 1 Time-quanta
3: 5 Tseg1
4: 2 Tseg2
5: 1000 ID Bits 0..10
6: 0000 ID Bits 11..23
7: 00 ID Bits 24..28
8: 6 Rx, real IEEE4, LSB 1st
9: 25 Start Bit No.
10: 32 No. of Bits
11: 1 No. of Values
12: 1 Loc [ value_A ]
13: 1.0 Mult
14: 0.0 Offset
Start bit (parameter 09:) Left Hand reference.
2: SDM-CAN (P118)
1: 00
SDM Address
2: 1 Time-quanta
3: 5 Tseg1
4: 4 Tseg2
5: 1001 ID Bits 0..10
6: 0000 ID Bits 11..23
7: 00 ID Bits 24..28
8: 6 Rx, real IEEE4, LSB 1st
9: 16 -- Start Bit No.
10: 32 No. of Bits
11: 1 No. of Values
12: 1 Loc [ value_A ]
13: 1.0 Mult
14: 0.0 Offset
D-6