Section 80
00-02-0829
2018-02-26
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19 -
Bit placement is sequential from the starting byte/bit position. For example, an analog input is
expressed as a 10 bit value in 2 bytes of data. The start position is given as 2.2 meaning byte
2, bit 2. The 10 bits are ordered starting in byte 2, bit 2 and continue throughout byte 1. The
illustration below shows the numeric value 221 (DDh) or 00 1101 1101 in binary format in the
dark gray portion. The light gray bits are not used.
Example Start Position
Byte 1
Byte 2
Byte 3
Byte 4
Bits
8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1
Data 1 1 0 1 1 1 0 1 1 1 1 1 1 1 0 0
NOTE:
As specified by J1939, unused data bits are filled with 1 and report
back as 0.
Содержание Xpansion IX3212
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