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1939STB4600 Manual 21
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91 792444 – Fax +353 91 792445
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.