Campbell Scientific SDM-CAN Datalogger to CANbus Interface - Manual (Page 70)

Appendix D. Examples of CAN Data Frames and Data Encoding and Decoding
32bit data frame with two 16bit signed integer values MSByte first
Rxed Bit order within bytes 87654321 87654321 87654321 87654321
Rxed Byte order Byte 1 Byte 2 Byte 3 Byte 4
Values S B S A
Bit order within values 16 9 8 1 16 9 8 1
Value byte order MSByte LSByte MSByte LSByte
Start bit (parameter 09:) RH ref 32 25 24 17 16 9 8 1
Start bit (parameter 09:) LH ref 1 8 9 16 17 24 25 32
S = sign bit which is the MSBit of the values, bit 16.
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: 3 Rx, signed int, MSB 1st
9: 1 Start Bit No.
10: 16 No. of Bits
11: 2 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: 3 Rx, signed int, MSB 1st
9: 32 -- Start Bit No.
10: 16 No. of Bits
11: 2 No. of Values
12: 1 Loc [ value_A ]
13: 1.0 Mult
14: 0.0 Offset
D-8