User manual

MAN0051-01 30 JUN 2000 PAGE 17
CH. 2
2.4.3 VGA Port
The PC CPU provides a standard DE15 female connector for connection to VGA Monitors (CRTs). This
is sometimes known as a 15-pin "high density" connector; as 15 pins reside in a connector the same
width as a DB9 connector.
2.4.4 Keyboard Port
The PC CPU contains a 6-pin, PS/2-style keyboard connector. Standard keyboards with this connector
are widely available. To connect keyboards with the larger, AT-style connector, adapter cables can be
purchased from computer supply stores.
2.4.5 External 3.5" Floppy Diskette/CD ROM Option
For those customers ordering the external floppy diskette or CD option, a parallel port interface to the
external drive is included. This drive is accessible from DOS as Drive D.
2.4.6 Frame Ground Connection
The Horner APG PC CPU has been carefully designed to withstand harsh industrial environments. The
key to the success of this design is a solid ground connection made to the external power connector on
the front of the module. A three-position terminal strip is present on the module for this purpose. A 12-
gauge conductor should be connected between this terminal strip and the earth ground on the control
panel.
Without a proper Earth Ground, the noise immunity of the PC CPU is significantly reduced
.