CPU-side Connector Descriptions

This section describes the connectors used to interface to the CPU card and expansion cards in the PC/104 stack.

VGA

VGA TO CPU (J3)

The J3 connector is a 2x4 pin, 0.1" pitch female header that interfaces directly to the VGA connector on the Diamond Systems Athena PC/104 CPU.

Figure 1: J3 - VGA to CPU

VGA TO EXPANSION CARD (J29)

Figure 2: J29 - VGA to Expansion Card

USB (J6 and J8)

The J6 and J8 connectors are identical 2x5 pin, 0.1" pitch female headers that interface directly to the USB connectors on the Diamond Systems Athena PC/104 CPU.

Figure 3: J6/J8 - USB to CPU

Ethernet (J26)

The J26 connector is a 1x6 pin, 0.1" pitch female header that interfaces directly to the Ethernet connector on the Diamond Systems Athena, Prometheus and Elektra PC/104 CPUs.

Figure 4: J26 - Ethernet to CPU

Multifunction (Serial, Keyboard, Mouse, Utility) (J15)

The J15 connector is an 80-pin high density connector, 3M part number P50-080-S-R1-TG, that provides the interfaces for the four serial ports from the CPU, the keyboard/mouse interface and certain utility signals. The power LED signal is routed to the power LED on the panel board. The speaker output signal is routed to the PC speaker on the panel board. The reset signal is routed to the reset connector on the panel board. All remaining signals on this connector, including the LPT port and other utility signals are not connected on the panel board and are not made available outside the enclosure.

Figure 5: J15 - Multifunction (serial, keyboard, mouse, utility) to CPU

Data Acquisition from CPU (J14)

The J9 connector is a 2x25 pin, 0.1" pitch female header that routs signals directly from the data acquisition connector on the Athena, Prometheus or Elektra PC/104 CPUs. These signals include 16, 16-bit analog inputs, four 12-bit analog outputs and 24 digital I/O lines, along with control for two counter/timers.

Figure 6: J14 - Data Acquisition to CPU

Power (J36)

The J36 connector is a 1x6 pin 0.1" pitch header that provides +5v power to the CPU card. For this power interface to be active, either the power switch bypass jumper 0 Ohm resistor at R3 must be installed or the power switch must be cabled to connector J25.

Figure 7: J36 - Power to CPU

Data Acquisition from Expansion Board (J31)

The data acquisition connector at J31 is designed to provide an interface to the outside from a 50-pin connector on an expansion board in the PC/104 stack. This connector is a 2x25 pin, 0.1" pitch male header that connects pin for pin with connector J10 on the user side of the panel board.

Figure 8: J31 - Data Acquisition to Expansion Board

Serial from Expansion Board (Emerald-MM) (J30 and J33)

Connectors J30 and J33 provide an interface to a serial port expansion board such as a Diamond Systems Emerald MM-4. Each connector is a 2x10 pin, 0.1" pitch male header designed to cable interface to the connectors on the Emerald MM-4. The tables below shows the pin definition for the RS232, RS422 and RS485 protocols supported by the Emerald MM-4.

Figure 9: J30 /J33 - Serial to Expansion Board

RS-232 Configuration

RS-422 Configuration

RS-485 Configuration

Power interface to a DC/DC power supply expansion board (Jupiter MM) (J35)

Connector J35 is used to interconnect the front panel power input to a DC/DC power supply board, such as the Diamond Systems Jupiter MM, in the PC/104 stack. When this interface is used, the direct CPU power interface through connector J36 is not used. Instead, the CPU is powered through the PC/104 bus by the power supply board. This connector is cabled to the DC/DC power supply board as indicated in the cabling drawing, below. To activate this interface without the use of the power switch, the bypass jumper at R2 must be installed with a 0 Ohm resistor. To activate this interface with the use of the power switch, the power switch must be cabled to connector J23.

Figure 10: J35 - Power to DC/DC Power Supply Board