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Negative Response Codes
Posted: Thu Dec 11, 2014 6:24 am
by sonofsmog
Is it possible to return negative response codes (ISO-1420, CAN) with the stock software/firmware or would we need to modify it?
Re: Negative Response Codes
Posted: Fri Dec 12, 2014 11:26 pm
by stanley
some PIDs can have negative value.
Re: Negative Response Codes
Posted: Fri Jan 09, 2015 4:35 am
by sonofsmog
I mean negative response codes. Not negative values. Services can report that they are not supported, not ready, response pending, etc.
The negative response Service is $7F.
So for example if a scan tool is requesting say the CVN (Sevice 0x09, InfoType 0x06.) The vehicle could respond something like $7F $09 $18.
$7F being the negative response SERVICE
$09 being the requested service
$18 being the reason.
Does the emulator support this?