Diamond Systems Athena III Manuel de l'utilisateur - Page 6

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FUNCTIONAL DESCRIPTION

The panel I/O board contains three major sections: SBC I/O section, Expansion I/O section, and Power section.

4.1 SBC I/O Section

The SBC I/O section brings out all the SBC I/O to the front panel connectors. On the top side it has industry

standard I/O connectors, and on the bottom side it provides dual row 2mm pin sockets on the bottom of the board

to mate with the corresponding 2mm pin headers on the SBC.

4.2 Expansion I/O Section

The Expansion I/O section contains additional connectors for bringing out the I/O from one PC/104 module

installed below the Athena III SBC inside the enclosure.

The first feature provides I/O for a generic PC/104 I/O board. It includes a 50-pin 2x20 .1" pitch pin header for

mating with a standard ribbon cable that connects to the I/O connector of a PC/104 board. This pin header is on

the bottom right side of the panel board in a spot convenient for mating with the standard PC/104 board I/O

connector location. On the top side a DB37 connector is provided for external access to this I/O.

The second feature provides I/O for a DSC EMM-XT / EMM-4M-XT serial port board. It provides two 2x10 .1"

pitch pin headers in the upper right corner for connection to the EMM board, and 3 DB9M connectors in the top

left center and 1 DB9M connector in the right center for external access.

4.3 Power Section

The Power section provides two paths for input power coming from either a +5V, +12V or variable input voltage

source. The power input connector consists of a 1x4 header that connects to a plug with screw connectors for

connections to +5V, +12V or system voltage and ground.

The +5V source is routed through a 1x2 .156" pitch friction lock connector for a front panel switch and then to a

pin socket on the bottom side that mates with the Athena III SBC. The switch connector can be bypassed with a

jumper if desired.

The +12V or variable input voltage source is routed through another 1x2 .156" pitch friction lock connector for a

front panel switch and then to a separate 1x2 .156" pitch friction lock connector for connection to a DC/DC power

supply mounted inside the enclosure. The 5VDC output of this DC/DC power supply then has two paths to the

Athena III SBC: (1) It can connect directly to the PC/104 bus of the system, if the power supply is mounted on the

bus; or (2) it can be routed back to the panel I/O board with another connector and then to the Athena III SBC

through the panel I/O board's pin socket connection.

The panel I/O board also provides a path for optional +12VDC output from the power supply to the Athena III SBC

through the pin socket.

Another connector provides auxiliary power to any peripherals mounted inside the Pandora enclosure like hard

disk drives or other data storage devices or recorders.

The power section contains a green LED which is connected to the +5VDC signal to indicate power status.

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Athena III Panel I/O Board User Manual Rev A