[spyderboyant]

Hi all,

does anyone know what the ALFID is and why it can be changed in the UP/DOWN section of VCP??  When reading EEPROMs for some modules its by default 44.... I think there might be other values and because its an option, it must be significant.

Looking at an ODX file under part of the signature information it shows:

<SECURITYS>
...
...
 <SECURITY>
   <SECURITY-METHOD TYPE="A_ASCIISTRING">ALFID</SECURITY-METHOD>
   <FW-SIGNATURE TYPE="A_BYTEFIELD">0141</FW-SIGNATURE>
 </SECURITY>
...
...

thanks
a

[ciamardo]

Hi all,

does anyone know what the ALFID is and why it can be changed in the UP/DOWN section of VCP??  When reading EEPROMs for some modules its by default 44.... I think there might be other values and because its an option, it must be significant.

Hi

Alfid is a UDS protocol element, standard value is ‘$44’ ,
Change value, default 44 to 22/33/21 if you get "Incorrect string length - incorrect format" error message in UDS.

[spyderboyant]

cheers. I also found this:

class udsoncan.AddressAndLengthFormatIdentifier(address_format, memorysize_format)
This class defines how many bytes of a memorylocation, composed of an address and a memorysize, should be
encoded when sent over the underlying protocol. Mainly used by ReadMemoryByAddress, WriteMemoryByAddress, RequestDownload and RequestUpload services
Defined by ISO-14229:2006, Annex G
Parameters
• address_format (int) – The number of bits on which an address should be encoded.
Possible values are 8, 16, 24, 32, 40
• memorysize_format (int) – The number of bits on which a memory size should be
encoded. Possible values are 8, 16, 24, 32