[eagle] Re: CAN-Do-Too! ??????????
bill at hsmicrowave.com
Tue Jul 10 11:46:37 PDT 2007
I really appreciate you explaining the reasoning for the 15 versus 9
pins. Not having been around when the CAN-Do evolved, I wasn't aware of
the thinking behind it but had noticed the currently "unused" pins and
had to ask the question.
I have used a slightly thiner version of the D-Subs made by AMP but can
put my hands on the P/N. But it's hard to beat the ubiquitous D-Subs.
Regards...Bill - N6GHz
Chuck Green wrote:
> It has been suggested that a DE-9 would be sufficient. Technically,
> this is correct. But it would require the elimination of five of the
> six user pins. Maybe "require" is too strong a word. Note that there
> are two CAN-H, two CAN-L, two power, and two ground (well, we ended up
> with three grounds). Technically, only one of each is needed. But two
> each were were provided to simplify the construction of the wiring
> harness (no small issue). The six user pins (one of them is named EB)
> were for special needs a module might have. Six may be overkill? The
> naming of one "EB" is a legacy from P3D where the engineering beacon was
> so pervasive throughout the satellite that it was decided to actually
> name one of the user pins as such. Part of this is also driven by
> P3E/P5A perceived requirements. P3E has used some of the user pins to
> input structure thermistor signals to modules that do not otherwise use
> all of their analog input pins on the 40 pin connector.
> The sub-miniature D connector series has served us well. If anyone has
> *experience* with something they think might be a better choice, we'd
> love to hear about it.
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