VT-VX Clusters

[VX L67 Getrag]

Yeah correct first 16 double bytes, if my calculations are right I think that odo reading would be 64899kms in your dump?

[kham383]

Can someone show me how to calculate this
I started with 137235 tried to 0 the ks and ended up with 274464
this is what i did
137235+137235+1440 =255910
/ 16 = 17244 hex value 435C
FFFF - 435C = BCA3

Should i have taken 1000000 - 137235 = 862765 difference then added 1440 = 864205
/16 = 54012 hex value D2FC
FFFF - D2FC = 2D03
Both bins are VU SS Ute v8 auto series 2 bin has gear prnd321

[VX L67 Getrag]

To figure out an odo read do FFFF – the hex amount & then convert to decimal multiply by 16 & minus 1440 & this should be the ODO figure?

Did you read these off an eeprom or with a reader/programmer?

[kham383]

I powered them up to get the ks first then unsoldered them & read them in my programmer
changed the value to BCA3 put the chip back on then powered it up again & it read 274464 not 000000 which was what i was aiming for.
where am i going wrong?

[VX L67 Getrag]

I just read the series 1 & looks like the bytes are low first & then high last, which I think will read error but if used 16 of 24 DE it would be 896112Kms I believe, but would probably error out as low first like I said!

If you want to keep it simple make all first 16 dytes the same & I think if it's 16 of FA5F it would be 000000Kms or 16 of FA5E would be 000,016Kms I think!

But I'm pretty sure it reads highest first so if you had first 15 FA5F & then 16th FA5E should work out to 000,015Kms etc.... if my calcs are correct!

EDIT: got last calc way wrong, took 16 bytes off & not 1!

[kham383]

Ok i tried FA5F in all 16 when i powered it up it read 21600
So how did you do the calculation to get the hex value FA5F
FA5F bin attached
thanks.

[kham383]

FFFF – FA5F = 5A0 then convert to decimal 1440 multiply by 16 = 23040 & minus 1440 = 21600

[VX L67 Getrag]

Sorry not in front of pc anymore & must have got calcs slightly out, I should get a chance to look tomorrow!

[Tazzi]

If you want 0 kms..
Add 1440 to the desired value.. 1440+0 = 1440

Divide by 16... Decimal = 90, hex = 5A

Minus that from 0xFFFF... 0xFFFF - 0x005A = 0xFFA5)

So enter FFA5 into all 16 spots

Easy as.

[kham383]

If you want 0 kms..
Add 1440 to the desired value.. 1440+0 = 1440

Divide by 16... Decimal = 90, hex = 5A

Minus that from 0xFFFF... 0xFFFF - 0x005A = 0xFFA5)

So enter FFA5 into all 16 spots

Easy as.

Thanks that worked.
Weird thing is i tried that calculation first, powered it up & it read 23040 so i pulled the chip and tried all the other stuff.
When i did it this time it still read 23040 when powered up so i walked away, came back screwed it back in the housing & powered it up & it read 000000 go figure .
Must not have been sitting correctly.
Thanks everyone for the help