B&B Electronics 1939STB manual Appendix B. Example

Appendix B. Example

This example uses the SAE “Electronic Axle Controller #1” (EAC#1). The specifications are as follows:

Transmission Repetition Rate:								500 ms
Data Length:								8 bytes
Data Page:								0
PDU Format:								240
PDU Specific:								5
Default Priority:								6
Parameter Group Number:								61,446 (00F006) hex
Source Address:								249 (off-board diagnostic / service tool #1). See note below.
S		Priority			R	D		PDU Format (PF)						S	I	PF				PDU Specific								Source Address						R
O		3 Bits			1	P			8 Bits					R	D	Cont.				8 Bits									8 Bits					T
F					*									S	E													(See note below.)						R
X	1		2	3	1	1	1	2	3	4		5	6	X	X	7	8	1	2	3	4	5	6	7	8	1	2	3	4	5	6	7	8	X
X	1		2	4	5	6	7	8	9	10		11	12	X	X	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	X
X				Byte 7							Byte 8			X	X		Byte 8 cont.							Byte 9						Byte 10				X
X	7		6	5	4	3	2	1	0	7		6	5	X	X	4	3	2	1	0	7	6	5	4	3	2	1	0	7	6	5	4	3	X
X	1		1	0	0	0	1	1	1	1		0	0	X	X	0	0	0	0	0	0	0	1	0	1									X
X														X	X																			X

* R1 is the reserved bit. ALL messages should set the SAE reserved bit to 0 on Transmit.

Byte 7									Convert to	Convert to
			Binary						Hex	Decimal
7	6	5		4	3	2	1	0
1	1	0		0	0	1	1	1	C7	199

The hex number is the value sent to the 1939STB.

NOTE: See SAE J1939–81 for Source Address management.

1939STB4600 Manual Appendix B B-1

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