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Interpretation of the CAN Identifier
3.2.1
The CAN identifier of a J1939 message comprises Parameter Group Number (PGN), source address,
priority, data page bit, extended data page bit and a target address (peer-to-peer PG only).
Priority
Extended
Data Page
3 bit
1 bit
In the PDU format < 240 (peer-to-peer), the PDU includes the target address. Global (255) can also be
used as target address. In this case, the parameter group is addressed to all devices, and the PGN
exists only in the PDU format.
If PDU format >= 240 (broadcast), the PDU format together with the Group Extension in the PDU specific
field form the PGN of the transmitted parameter group.
NAME field
3.2.2
The device will transmit its NAME after power on (J1939 NAME field).
J1939/81 specifies a 64-bit NAME – message for the clear identification of each ECU (electronic control
unit). The NAME Field comprises 10 entries, 5 are SAE-specific and 5 either represent the network
properties or are vendor-specific. For more information please refer to J1939/81.
J1939 NAME Field
Arbitrary
Industry
Address
Group
Capable
1 bit
3 bit
Process data – PDU Proprietary B message
3.2.3
The transmission rate for both variants can be configured and is therefore omitted in the following
description.
3.2.3.1 PGN 653631: 1-dimensional device message
Proprietary B message interpretation of 1-dimensional inclination sensors:
Data length: 8 bytes
Extended Data Page: 0
Data page: 0
PF: 255 (Prop. B)
PS: 83
Priority: 6
PG Number: 65363 (00FF53h)
Baumer_GIM500R_SAEJ1939_MA_EN.docx
03.19
Data Page
1 bit
Vehicle
Vehicle
Reserve
System
System
Instance
4 bit
7 bit
1 bit
PDU
Format
8 bit
Function
Function
rd
Instance
8 bit
5 bit
7/13
PDU
Source
Specific
Address
8 bit
8 bit
ECU
Manufac
Instance
turer
code
3 bit
11 bit
www.baumer.com
Identity
Number
21 bit