B&B Electronics 1939STB Message Information J1939 Message Information, Two Bit Values for Byte 5

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Message Information

Table 22. J1939 Message Information

Message Information

B

 

B

 

B

B

B

B

B

5

 

6

 

7

8

9

10

11

 

 

95

 

 

E7

 

0C

80

00

40

 

8C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The message information controls the action of the message. It also contains the header information that will be sent out on the J1939 bus. The bytes that control the message and are not transmitted to the bus are grayed in. Byte 5 and 6 are the message control bytes. They work together to control the message. The bit fields are set up in a two bit configuration as follows: NOTE: Byte 11 covered on page 18.

Table 23. Two Bit Values for Byte 5 and 6

Value of 2 bit field

 

Function on write

 

Function on read

0

 

0

 

Reserved

 

Reserved

 

0

 

 

1

 

 

Reset element

 

 

Element is reset

 

 

1

 

 

0

 

 

Set element

 

 

Element is set

 

 

1

 

 

1

 

 

No change

 

 

Reserved

 

The bit values shown in gray are the only values valid for the setup of the 1939STB.

1939STB4600 Manual

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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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Contents Model 1939STB RS-232 to J1939 Converter CETable of Contents SAE Publications Introduction1939STB4600 Manual Description Physical Description Electrical SpecificationCommunication directed to the device Format Byte 3 Nibble Control ByteByte Internal Functions Vendor String SetupVendor String Message Received from the SAE-J1939 BusRS-232 Baud Change Baud Rate SetupRS-232 Baud Rate Change cont’d Byte 5 UB3 Parity SetupWord Length Stop Bit SetupJ1939 Format External CommandsValid Codes for Byte Message Header SetupTwo Bit Values for Byte 5 Message Information J1939 Message InformationIntpnd ByteTransmit DLC DIR XTD Bit2J1939 Message Frame SAE-J1939 Control Header1939STB4600 Manual Shown in Table Byte1939STB4600 Manual Byte 1939STB4600 Manual Bytes 9 1939STB4600 Manual DIR Message Direction DLC Data Length CodeData Field ID Byte Reception of DataSAE-J1939 Bus Function Internal Messages Software Installation1939STB4600 Manual Message Transmission sending data to the 1939STB File Logging Saving Message InformationAppendix A. The Extended can / SAE-J1939 Message Frame Arbitration Field Appendix B. Example