Interpreters Document



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Bog'liq
dps Interpreters

Request 
Byte
Value 
Byte Description 

27 
Security Access Request Service ID 

XX 
AC1 (2) Access mode 
– if AC1 = 0, this byte would be 2, if 
AC1 = 1 this byte would be 4, etc. 

XX 
High byte of key

XX 
Low byte of key 
Send Security Access Request 2 for send key and receive response 
Endif 
If Security Access positive response 2 is received 
Look for Security Access positive response 2 service ID (67) in goto fields 
Else
If Security Access negative response "Invalid Key - 35" is received and ones complement was not 
used 
Repeat entire security process using ones complement security algorithm 
Else 
Look for Security Access negative response 2 response code in goto fields 
Endif 
Endif 
Else
If Security Access negative response "Time Delay not Expired - $37" is received 
If ten second timer has not expired 
Delay 2 seconds
Retry entire security process
Else
Look for Security Access negative response AC3 (1) response code ($37) in goto fields 
Endif
Else
Look for Security Access negative response AC3 (1) response code in goto fields 
Endif
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) 
Step 
Op-Code 
Action Fields
Goto Fields 
02 
27 
01 00 00 00 
67 03 37 13 FF 22 00 00 00 00 
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