How it works.


I cannot promise this will always be the latest information , but when things are slack in the garage Ill post up what I can.

Saturday, 4 October 2008

Back to Electrics...

Some time ago I posted up regarding the Isquared 1+1 system designed to make wiring easier by replacing masses of cabling. Well at the time I mentioned that the system was due to be upgraded to the ISIS system. Finally the first units have been shipped out and the ISIS website www.isispower.com is up and running.

Here is a pic of the 2 Powercell system from the user manual followed by a close up of the first units delivered to a Factory Five Cobra builder in the US. The close up system also has the optional RF link module (remote) and LCD diag display fitted.


This really is the next step up, all that is required is to run a CAN cable and main power cable from front to back of the car. All functions are controlled via CAN messages and as such the system can be programmed to respond how you want.

All trigger switching is at low voltage, 5v, signal level to ground. So each dash switch will have ground connected to one side and its output into the Mastercell. Given that GD switch full system current through the ignition switch this is something I am much happier with. Im sure the Vauxhall ignition switch can cope but not having high current floating around my dash is something I like much more.

More details to follow after Ive been to the post office. Nothing to do with this, just need to get there before they close!

Right, parcel posted.

Each input can relate to one or more outputs and conversely many inputs can control one output. So for instance if the fog light must only come on when the side lights are on you just set a relationship such that both input must be on for the output to be active.

This is set up using characteristic's called relationships and personalities;
Relationship describes how the input put relates to the output for example One to One for one input to one output or on to many for 2 inputs required to trigger one output.

Personalities describe how the output functions. Track for instance follows the input state whilst toggle changes state for each change of input state (momentary input switch gives latching output)

Slowly I've gone through and mapped out all the circuits I can think of and decided how to connect them up, how they should function and assigned personalities and relationships. Boy do I know how to have fun!

I figure on 3 Powercells to sort the GD, I know its going to be more expensive than buying the GD looms but on the upside its more fun, a bit more modern and hopefully easier. Also I figured the GD is a modern interpretation of a classic brought up to date, why leave the wiring in the 1960's?

This will give some other advantages as well;

1) The ability to turn on any circuit I want from the remote key fob. (lights for example to help find the car in a row of others)
2) Timed functions such as rad fans that can remain powered for a period after ignition off.
3) Ignition and starter circuit will be disabled until the key fob is pressed or similar security feature enabled.

Another thing as well, if I decide that I dont ike the programming, it can be change in situ so a switch function can be re assigned without taking anything apart.

Im liking this the more I look at it, at least Ive figured it out now before buying any looms.