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COMMUNICATION PROTOCOLS
ACK/NACK – Acknowledge / Negative Acknowledge
Transmission Rate:
As Needed
Data Length:
8 bytes
Data Page:
0
PDU format:
232
PDU speci
fi
c:
Destination Address
Default priority:
6
PGN:
59,392 (0x00E800)
Byte: 1
Control Byte
0: Positive Acknowledgment (ACK)
1: Negative Acknowledgment (NACK)
2: Access Denied (PGN supported but access denied)
Byte: 2
Group Function Value (if applicable)- N/A
Bytes: 3–5
Reserved for assignment by SAE, send each of these
bytes as “FF”
Byte: 6–8
Parameter Group Number of requested information
AMB – Ambient Conditions
Transmission Rate:
1 sec
Data Length:
8 bytes
Data Page:
0
PDU format:
254
PDU speci
fi
c:
245
Default priority:
6
PGN:
65,269 (0x00FEF5)
Byte: 1
Barometric Pressure (SPN 108)
Resolution:
0.5 kPa / Bit, 0 kPa offset
Byte: 2
Cab Interior Temperature - N/A
Bytes: 4,5
Ambient Air Temperature (SPN 171)
Resolution:
0.03125°C / Bit, -273°C offset
Byte: 6
Air Inlet Temperature (SPN 172)
Resolution:
1°C / Bit, -40°C offset
Bytes: 7,8
Road Surface Temperature - N/A
6-30
All information subject to change without notice.
(Rev. 01/07)
7SA827 0701
Copyright © 2007 DETROIT DIESEL CORPORATION