Interpreters Document



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dps Interpreters

Typical Interpreter Line: 
Step 
Op-Code 
Action Fields
Goto Fields 
08 
D4 
01 00 F4 00 
00 09 FD 12 FF 4A 00 00 00 00 
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1993-2011 General Motors Company, GM Customer Care & Aftersales. All Rights Reserved.
Page
52 
D5 Op-Code: Download Calibration / Software File using Mode 12 (Electric Vehicle) 
 
Supported By:
UART Interpreter 0 
 
Description: 
 
The D5 Op-Code is used to download a data file using mode 12 (0C) messages. It was developed 
specifically for reprogramming the BTCM controller of the EV1 electric vehicle. To perform a 
download, the device must be prepared to accept a download by receiving a success response from a 
05 Op-Code. 
The "data address information" in the calibration file, which must use the Saturn calibration file format, 
is used for the first packet of data that is downloaded. The address will then be incremented by the 
number of bytes that are downloaded in each calibration data packet (i.e. if address 1 = 0x8000 and 
0x80 bytes are downloaded in the data packet, then address 2 = 0x8000 + 0x80 = 0x8080). No prolog 
is used. 
See the pseudo code for more detailed information concerning Op-Code function. 
Action Fields: 
AC0: 
ID of file to download 
AC1: 
Device ID 
AC2: 
Not Used 
AC3: 
Not Used 
Pseudo Code: 
XX D0 AC0 AC1 AC2 AC3 G0-G1 G2-G3 G4-G5 G6-G7 G8-G9 
Find the file with ID equal to AC0 
Load the file into memory 
Build Mode 12 Download Request as indicated in the table below, contents of the XX locations is detailed in 
the pseudo code following the table 
Request 
Byte
Value 

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