General Specification Electrical Function gmw3110 General Motors Local Area Network Enhanced Diagnostic Test Mode Specification


 Frame Data Byte Definition Based On Address Method



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4.5.1 Frame Data Byte Definition Based On Address Method. 
GMLAN diagnostic messages shall support 
different combinations of addressing and segmentation methods as determined by the CANId and diagnostic 
service used. 
4.5.1.1 General Frame Format. 
The following sections describe the addressing schemes and CAN frame 
formats including the Network Layer Protocol Control Information (PCI). The sections following the general 
description section describe the specific usage for GMLAN enhanced diagnostics. Detailed descriptions of the 
addressing schemes and the CAN frame formats can be found in ISO 15765-2 and OSEK/COM. 
4.5.1.1.1 Addressing Schemes (Table 13). 
Table 13: Addressing Scheme Summary 
Addressing Scheme Name 
Identifier 
CAN frame data field 
Description 
ID 








NORMAL 
CAN Id 
EXTENDED 
CAN Id 
EA 
4.5.1.1.2 Protocol Control Information (PCI) Formats for GMLAN. 
All references to Protocol Control 
Information (PCI) within this specification relate only to the network layer (referenced as N_PCI within 
ISO 15765-2). As shown in Tables 14 thru 17 below, the PCI information can be 1, 2, or 3 bytes in length 
depending on the frame type. 
Table 14: Location of Protocol Control Information (PCI) Using Normal Addressing 
Addressing Scheme Name 
Identifier 
CAN frame data field 
Description 
ID 








NORMAL - SingleFrame 
CAN Id 
PCI 
NORMAL - FirstFrame 
CAN Id 
PCI 
NORMAL - FlowControl 
CAN Id 
PCI 
NORMAL - ConsecutiveFrame 
CAN Id 
PCI 
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