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

[Ralph L. Fullenwider]

Greg:

I agree with the use of the KISS method and analog readouts.

I had a couple of back channel questions concerning some of the technical
talk lately and asked to shed a little light so more of an understanding
might be had. So I wrote a little blurb to do that.

The RV industry is behind the curve with technology but are starting to get
away from relay logic and going to multiplexing systems. Of course this
technology has been out for years in the industrial arena along with fiber
optics and 422 and 232 communications with up to 25 nodes on each single
conductor.

All the high line coaches are just now starting to pick up on some of this
stuff, The problem being, most of this technology was never meant to be
rolling down the road at 70MPH in a 40K plus motor coach.

Yep, give me the tried and true any day, but one has to keep up with on
going technology or get left behind. Am still trying to figure out
blue tooth and how to program the VCR. lol

Safe travels,

Ralph and Charolette Fullenwider
84FC35
Ralph's RV Solutions, Duncan, Oklahoma

At 08:06 PM 2/6/2007 +0000, you wrote:
>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
> >
>
>
>