Motec Systems PDM32 - CAN Input Channel Examples

32 Appendices
CAN Input Channel Examples
Sample received CAN message used in examples below
Byte
0 1 2 3 4 5 6 7
Value (hex)
00 00 F3 21 40 00 CC 8A
Channel Extraction Examples
Offset Data Size Mask
Byte 2 8bit FF
Resulting channel: 0xF3 masked with 0xFF = 0xF3
Offset Data Size Mask
Byte 2 8bit 02
Resulting channel: 0xF3 masked with 0x02 = 0x02
Offset Data Size Alignment Divisor
Byte 3 16bit (signed) Normal 100
Resulting channel: 0x2140 / 100 = 85
Offset Data Size Alignment Divisor
Byte 3 16bit (signed) Swap Bytes 100
Resulting channel: 0x4021 / 100 = 164
Offset Data Size Alignment Divisor
Byte 2 16bit (signed) Normal 100
Resulting channel: 0xF321 is negative (-3295) so channel is clamped to 0
Offset Data Size Alignment Mask Divisor
Byte 6 16bit (unsigned) Swap Bytes 0FFF 25
Resulting channel: (0x8ACC masked with 0x0FFF) / 25 = 110