Ifm-electronic JN2300 Manuel d'utilisateur télécharger pdf (Page 7)

Inclination sensor JN

7 SAE J1939 interface

The inclination sensors have a standardised SAEJ1939 interface� All measured

values and parameter groups can be accessed via the J1939 protocol� The

individual configuration can be saved in the internal permanent memory (flash)�

7.1 Overview and structure of the SAE J1939 protocol

SAE J1939 uses 29-bit CAN identifier (extended frame format CAN 2�0B)� An SAE

J1939 message has the following structure:

SAE J1939 message

29-bit CAN identifier Data

Priority

28…26

PGN

25��8

Source address

7��0

User data of the

message

0…8 bytes

Parameter Group Number (PGN)

Ext� data page 25 Data page 24 PDU format (PF)

23…16

Target address / group

extension (PS) 15…8

PDU format 1 (specific)

00h - EFh

23…16

Target address (DA)

15…8

PDU format 2 (global)

F0h - FFh

23…16

Group Extension (GE)

15…8

7.1.1 PDU format 1

This format defines a message which is sent to a defined unit� In this case the

PDU-specific byte (PS) is the target address (DA) of the unit� If the value of the

PDU format field (PF) is between 0x00 and 0xEF, it is a PDU format 1 message�

For proprietary (manufacturer-specific) messages the PDU format value 0xEF is

defined� Ext� data page bit = 0 and data page bit = 0�

7.1.2 PDU format 2

This format defines a message which is sent globally� In this case the PDU-

specific byte (PS) corresponds to the group extension (GE)� If the value of the

PDU format field (PF) is between 0xF0 and 0xFF, it is a PDU format 1 message�

For proprietary (manufacturer-specific) messages the area (PDU format PF) and

group extension (GE) 0xFF00 – 0xFFFF is defined�

Ext� data page bit = 0 and data page bit = 0

1 2 3 4 5 6 7 8 9 10 11 12 ... 22 23

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Ifm-electronic JN2300 Manuel d'utilisateur Page 7

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