Parker Hannifin Corporation
– GS100 User Manual
16
7 CAN Information
SAE J1939
The J1939 standards come from the international Society of Automotive Engineers (SAE) and were
developed to provide a standard architecture by which multiple electronic systems on a vehicle can
communicate. J1939 has been implemented in a broad range of vehicles and transportation systems
and provides a reliable communication protocol over a high-speed CAN network.
The GS100 uses this protocol to transmit its condition as a predefined set of outputs. All messages are
SAE J1939 Proprietary B PGN's except the address claim request and response.
Network Compatibility
The GS100 is compatible with 125kbps, 250 kbps or 500kbps CAN baud rates
, qualifying it as a “High-
Speed” CAN sensor. Per ISO 11898-2, the linear bus must be terminated with two 120 Ω resistors at
the ends of the transmission lines.
External CAN termination is required and not provided with the GS100 product. Follow SAE J1939
standards when creating the harness connected to the sensor.
Identifier Description
The J1939 protocol uses a 29-bit identifier. The 29-bit identifier is built up as follows:
•
Bit 1-8 is Source Address (
SA
)
•
Bit 9-24 is Parameter Group Number (
PGN
)
•
Bit 25 is Data Page (
DP
)
•
Bit 26 is Reserved (
R
)
•
Bit 27-29 is Priority (
P
)
Each identifier has an associated 8-byte data field. The data field is built up as shown below.
29-bit IDENTIFIER
P
riority
R
D
P
P
arameter
G
roup
N
umber
S
ource
A
ddress
PDU Format
PDU Specific
CAN 29
Bit ID
Position
29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
Table 7.3:1 J1939 CAN Identifier Structure
