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B&B Electronics manual Function, 1939STB4600 Manual, Mc

Models: 1939STB

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Function

This is used to show where the message came from. Refer to Table 37. If the Nibble 2 is set to 0, then the message is from the J1939 bus. If Nibble 2 is set to 2, it is an internal message (for example, Vendor ID).

Table 38. MC

		Nibble 2				Nibble 1
Bit 7	Bit 6		Bit 5	Bit 4	Bit 3	Bit 2	Bit 1	Bit 0

This is a byte from the controller. Nibble 2 is the number of data bytes (0-

8)in the message. Nibble 1, Bit 3 is the message direction. Bit 2 should always be set to 1. Bit 1 and 0 are not used.

30	1939STB4600 Manual
	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

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B&B Electronics manual Function, 1939STB4600 Manual, Mc

Contents

Model 1939STB RS-232 to J1939 Converter CEInternational Headquarters European HeadquartersTable of Contents INTRODUCTIONSAE-J1939 CONTROL HEADER INTERNAL MESSAGESIntroduction Surface Vehicle Recommended Practice1939STB4600 Manual Fax +353 91Description 1939STB4600 Manual Electrical SpecificationPhysical Description Communication directed to the device Format Control Byte Table 3. Bits of ByteTable 4. Byte 3 Nibble Table 5. Transmit Data Format1 of control byte 4 has the following functions Table 9. Vendor String Setup Internal FunctionsVendor String Table 10. Message Received from the SAE-J1939 BusRS-232 Baud Change Table 11. Baud Rate SetupTable 12. Baud Rate Setup 1939STB4600 Manual Table 13. Baud Rate SetupRS-232 Baud Rate Change - cont’d Table 15. Parity Setup RS-232 Baud Rate Change cont’dByte 5 UB3 Table 14. Byte 5 UB3default value Bit 2 stop bit works in conjunction with bits 1 and bitBits 1 and 0 set the word length 1939STB4600 ManualExternal Commands Table 18. J1939 FormatMessage Header Setup 1939STB4600 ManualTable 19. J1939 Message Header Table 20. Valid Codes for ByteMessage Information Table 22. J1939 Message Information Table 23. Two Bit Values for Byte 5 andByte Table 24. Byte 1939STB4600 ManualByte Table 25. Byte Transmit1939STB4600 Manual Byte Table 26. ByteXTD Bit2 SAE-J1939 Control Header Table 27. J1939 Message Frame1939STB4600 Manual Byte Shown in Table1939STB4600 Manual Byte Bits 7, 6, 5, 4, and 3 of Byte 8 along with Bits 2, 1, and 0 of Byte 7 make up the first part of the PDU Protocol Data Unit. The first 8 bits are the PDU format. The values for specific formats will have to be supplied by the user1939STB4600 Manual Bytes 9 and 1939STB4600 Manual Byte ByteDLC Data Length Code DIR Message DirectionData Field Table 35. J1939 Message FrameArbitration Field ControlReception of Data SAE-J1939 BusID Byte Table 37. FunctionTable 38. MC Function1939STB4600 Manual Internal Messages Table 39. Message Received from the SAE-J1939 BusSoftware Installation1939STB4600 Manual 1939STB4600 Manual Message Transmission sending data to the 1939STBMessage Reception Saving Message Information File LoggingAppendix A. The Extended CAN / SAE-J1939 Message Frame Appendix A Arbitration Field1939STB4600 Manual Appendix B. Example Source Address