Byte 7
(Shown in Table 29)
Bits 7, 6, and 5 of byte 7 set the J1939 priority bits. Bit 7 is the MSB. Bit 5 is the LSB. To code a priority value = 6 set bit 7 = 1 bit 6 = 1 bit 5 = 0.
Bit 4 is the reserved bit - the J1939 specification sets this bit to zero. It may be used in the future therefore it is NOT hard coded. The user must set this bit to zero for every transmitted J1939 message.
Bit 3 is the data page bit and select page 0 or page 1and is set by the user.
Bits 2, 1, 0, are the MSB’s of the PDU format.
1939STB4600 Manual | 21 |
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