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Campbell Hausfeld SDM-CAN C.3 J1939 Data Frame Format , C.4 Retrieving J1939 Accelerator Pedal Position Data using a CR9000/CR5000 (Bus Speed 250k Baud)

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SDM-CAN CAN-Bus Interface User Guide

C.3 J1939 Data Frame Format

The Data Frame consists of 8 bytes with byte one at the left side of the frame and

byte eight at the right side. Within each byte, bit 8, the most significant bit is at the

left side of the byte.

Multi-byte values are conventionally displayed with the least

significant byte first. For example LSB of engine speed is Byte 4

and MSB is byte 5.

NOTE

Table C-3 J1939 Data Frame Format

1 2 3 4 5 6 7 8

87654321 8765432187654321 87654321 87654321 87654321 87654321 87654321

Details of specific data frame values can be found in the SAE J1939

standard.

NOTE

C.4 Retrieving J1939 Accelerator Pedal Position Data using a CR9000/CR5000 (Bus Speed 250k Baud)

C.4.1 Encoding the Identifier Field Values

The following example shows how to encode the identifier field values into the

format for the CR9000/CR5000 ID parameter.

The identifier field values for the CAN Data Frame are as follows:

Priority 310

Reserved 010

Data Page 010

PDU Format 24010

PDU Specific 310

Source Address 010

These decimal values then need to be converted to binary and encoded into the 29

bit identifier.

Priority 0112

Reserved 02

Data Page 02

PDU Format 111100002

PDU Specific 000000112

Source Address 0000 00002

C-2

Contents

Main SDM-CAN CAN-Bus Interface User Guide Page Guarantee Page Contents Page Section 1. Introduction 1.1 General Description 1.2 Specifications 1.2.1 General Features and Specifications 1.2.2 Electrical Specifications 1.2.2.1 Power Consumption 1.2.3 Physical Specifications Page Section 2. Installation 2.1 Address Switch Configuration 2.2 Internal Jumper Settings Page Page 2.3.1 LED Status Indication 2.4 Connection to CAN-Bus. Page Page Section 3. Programming CR10X, CR7 and CR23X Dataloggers to use the SDM-CAN 3.1 General Principles 3.2 System Limitations 3.3 The Datalogger Instruction Instruction 118: SDM-CAN SDM Address (Parameter 01:) TQUANTA, TSEG1, TSEG2 (Parameters 02:, 03:, 04:) t Bit time (t ) t ID (Parameters 05:, 06:, 07:) Data Type (Parameter 08:) Page Page Page Switch a: 0 This digit is currently unused; enter zero 3-11 Start Bit Number (Parameter 09:) Number of Bits (Parameter 10:) Number of Values (Parameter 11:) Location (Parameter 12:) 3.4 Advanced Programming Techniques 3.4.1 Interrupts Using the I/O Connection Page 3.4.2 Group Trigger 3.4.3 Frame buffers with filtering and triggering Setup of Mask and Filter / trigger Reading / Polling Buffer Basic Sequence of Buffer Usage:- 3.5 Program Examples 3.5.1 Reading CAN Data SDM-CAN CAN-Bus Interface User Guide 3.5.2 Simple CAN Data Transmission 3-18 The following example transmits a 16 bit temperature value to a CAN network running at 500K baud. ;When Flag 1 is high set SDM-CAN switches to transmit mode ;Load input location with value for switches 3.5.3 Building and Sending Data Frames 3.5.4 Using the Interrupt Function 3.5.5 Using the Group Trigger SDM-CAN CAN-Bus Interface User Guide ;Retrieve Data from CAN network B 3-22 ;Retrieve Data from CAN network B Section 4. Programming CRBasic Dataloggers to use the SDM-CAN 4.1 General Principles 4.1.1 High Speed Block Mode 4.2 Datalogger Instruction 4.2.1 Reading CAN Data 4.2.2 Simple CAN Data Transmission Flag(1) = False 4.2.3 Digital I/O Triggered CANbus Measurements 4.2.4 SlowSequence Instruction Section 5. Using the RS232 Serial Diagnostics Port 5.1 Connecting to the RS232 User Port 5.2 Diagnostic Commands Page 5.3 Loading a New Operating System into the SDM-CAN Interface Page Appendix A. Principles of Operation A.1 Data Collection A.2 Frame Transmission Page Appendix B. A Summary of Data Types A summary table of the data types is given below for quick reference. Page C.1 J1939 29-Bit Identifier Format C.2 J1939 11-Bit Identifier Format C.3 J1939 Data Frame Format 1 2 3 4 5 6 7 8 C.4 Retrieving J1939 Accelerator Pedal Position Data using a CR9000/CR5000 (Bus Speed 250k Baud) C.4.1 Encoding the Identifier Field Values C.4.2 Finding the Start Bit 1 2 3 4 5 6 7 8 C.5 Retrieving J1939 Accelerator Pedal Position Data using a CR23X/CR10X (Bus Speed 250k Baud) C.5.1 Encoding the Identifier Field Values C.5.2 Finding the Start Bit 1 2 3 4 5 6 7 8 Page Appendix D. Examples of CAN Data Frames and Data Encoding and Decoding Examples of values within a data-frame Page Page Page Appendix D. Examples of Encoding & Decoding D-5 Page Page Page Page Page Appendix D. Examples of Encoding & Decoding D-11 Page Page CAMPBELL SCIENTIFIC COMPANIES