What PID's/ SID's/FID's are

[Gregory OConnor]

Ralph, It may just be my nature but; I dont believe that all the
digital equipment is worth the worry. When I get a check engine
light; I check the engine. If the heat goes up; I back off the
demand. I have driven a good 400,000 on used class 8 diesel trucks
with as much as 700,000 miles on the clocks. Things do not often go
wrong and when they do:
1- it showes up in water/ oil heat and or performance
or
2-too late even while you watch a PC


digital stuff I see as more of a hobby.

GregoryO'Connor
94ptRomolandCA

--- In WanderlodgeForum@yahoogroups.com, "Ralph L. Fullenwider"
wrote:
>
> Hello everyone:
>
> For those who are not familiar with codes, multiplexing or other
forms of
> reporting used in this day and age, I will attempt to bring to
light a
> little about these systems in the later Coaches.
>
> The reporting codes and information are inputs and outputs much
like on the
> computer you are using for the Forum. And each code is simply an
address of
> where in a computer, the information is stored. So in order to get
a
> readout for that code, you have to have the input/output (I/O)
schedule for
> the addresses.
>
> Though we see the codes reported in decimal (number) form, the
actual
> addresses are usually programmed in Hex or Octal or even machine
coding,
> then converted to binary and finally to numbers. In doing this,
one wire
> can be used to send a signal out on and to report back on several
addresses
> depending on the speed of the polling process.
>
> The reason for the software, readers and so forth is to convert
these
> multiplexed addresses to a form that we can attach a number to and
have a
> readout of what code or instruction is in that address.
>
> The codes are usually preset with a read out of what it is.
Example: A
> polling takes place sending out a question to a certain address,
then if no
> flags are set nothing comes back. But if an address, such as the
DDEC
> address for Low coolant is polled and a flag set, it sends back a
number of
> 13. Then you look up the code on the map and it tells you, code 13
is
> coolant level sensor low, add coolant and the flag goes off
satisfied.
>
> This is much simplified, to be sure, but the general idea comes
across.
> Easy huh? Hope this helps a little for those wondering what people
are
> talking about in some of the posts.
>
> Safe travels,
>
> Ralph and Charolette Fullenwider
> 84FC35
> Ralph's RV Solutions, Duncan, Oklahoma
>