Interpreters Document

Request 
Byte
Value 
Byte Description 
1 
80 
Format byte for physical addressing 
2 
## 
Global target byte 
3 
## 
Global source byte 
4 
05 
Length of request from byte 5 up to checksum (not included) 
5 
37 
Request Transfer Exit Request Service ID
Calculate checksum and copy into the Request Transfer Exit service request
Send the Request Transfer Exit request and expect a response 
If an error occurred
End the routine download
Else 
Increment address used in Request Download service by the number of bytes transferred 
If remaining data is less than uncompressed memory size 
Use number of remaining bytes in Request Download service 
Endif 
Endif 
Endif 
If an error occurred
End the calibration download
Endif 
End do while more calibration to transfer
If Transfer Data positive response is received 
Look for Transfer Data positive response service ID ($76) in goto fields 
Else
Look for Transfer Data negative response, response code in goto fields 
Endif
If found
Goto appropriate step
Else 
Goto step indicated by FF goto field 
Endif
Typical Interpreter Line: (all Action and Goto fields are hex numbers. * An FD should be a goto field for a 
93 Op-Code.) 
Step 
Op-Code 
Action Fields
Goto Fields 
19 
93 
02 04 00 00 
76 26 10 0D FD 20 FF 28 00 00 
CameraLoops.com

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
1993-2011 General Motors Company, GM Customer Care & Aftersales. All Rights Reserved.
Page
152 
Interpreter 3 - GMLAN Communications Programming Op-Codes 
CameraLoops.com

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
1993-2011 General Motors Company, GM Customer Care & Aftersales. All Rights Reserved.
Page
153