Re: Homebrew STG card

[johnm-at-slmd.com]

EMC Folk,

The following simple schematic is to try and visualize what would be
ideal. I've thrown in a few suggestions, but really didn't think through
them very thoroughly -- meant for starting discussion.
Hope they come out in fixed font on your e-mail readers:

                                 Digital I/O input
   Computer side    |           screw connectors
                    |          +------------------+
 +------------------+          |oooo oooo oooo ooo|
 |   Homebrew STG   | 100 pin  |    Customized    |
 |                  |]==========[]  Break-out   []==%
 |         <lpt1>   |          |   o o          []==&
 +------------------+          +------------------+
  ####### ####      |               ^
    (pci)           |               |
                                 screw connectors
                                  to ESTOP
                                   switch



Continuation of schematic:


    ??   +------------------+
   26 pin{   Standard       |
%========{  SSR Module I/O  |
          |     Rack        |
          |ooooooooooooooooo|
          +-----------------+
          alternate to direct
           input from limit
              switches

         +------------------+
   26 pin{   Standard       |
&========{  SSR Module I/O  |
          |     Rack        |
          |ooooooooooooooooo|
          +-----------------+
          screw connectors to
           auxiliary output



Features:


Homebrew STG:

1) PCI bus interface
2) onboard 26-pin parallel input
3) 100 pin external output

Breakout Box:

1) built-in ESTOP circuit & screw connectors for
   ESTOP switch
2) Two 26 pin output to auxiliary SSR Module-I/O
   racks
3) Digital I/O encoder axis input screw connectors
   grouped by axis (encoder + limit + etc)

I'm sure I missed alot, but the idea I'm trying to portray
is to minimize the extra wiring and connectors to connectors.


John Moore