Campbell Scientific SDM-CAN Datalogger to CANbus Interface - Manual (Page 67)

Appendix D. Examples of CAN Data Frames and Data Encoding and Decoding
16bit data frame with one 12bit signed integer value LSByte first
Rxed Bit order within bytes 87654321 87654321
Rxed Byte order Byte 1 Byte 2
Values A S A
Bit order within values 4 1 12 5
Value byte order LSNib MSByte
Start bit (parameter 09:) RH ref 16 13 12 9 8 1
Start bit (parameter 09:) LH ref 1 4 5 8 9 16
S = sign bit which is the MSBit of the value, bit 12.
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: 4 Rx, signed int, LSB 1st
9: 13 Start Bit No.
10: 12 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: 4 Rx, signed int, LSB 1st
9: 4 -- Start Bit No.
10: 12 No. of Bits
11: 1 No. of Values
12: 1 Loc [ value_A ]
13: 1.0 Mult
14: 0.0 Offset
D-5