Notes on J3 Signals

 

COM1 – COM4

The signals on these pins are RS-232 level signals and may be

 

connected directly to RS-232 devices. The pinout of these signals is

 

designed to allow a 9-pin male IDC connector to be crimped onto the

 

corresponding ribbon cable wires to provide the correct pinout for a PC

 

serial port connector (DTE).

LPT1

The signals on these pins comprise a standard PC parallel port. The

 

pinout of these signals is designed to allow a 25-pin female IDC

 

connector to be crimped onto the corresponding ribbon cable wires to

 

provide the correct pinout for a PC parallel port connector.

Keyboard, Mouse

These are PS/2 signals for keyboard and mouse.

Clk

Clock pin; connects to pin 5 of the PS/2 connector.

V-

Power pin; connects to pin 3 of the PS/2 connector.

Data

Data pin; connects to pin 1 of the PS/2 connector.

V+

Power pin; connects to pin 4 of the PS/2 connector.

 

Pins 2 and 6 on the Mini-Din-6 PS/2 connectors are unused.

Utilities A

 

+5V Out

This pin is a switched power pin that is turned on and off with the ATX

 

power switch or with the +5V input.

Speaker Out

The signal on this pin is referenced to +5V Out. Connect a speaker

 

between this pin and +5V Out.

IDE Drive LED

Referenced to +5V Out. Does not require a series resistor. Connect

 

LED directly between this pin and +5V Out.

Power LED

Referenced to +5V Out. Does not require a series resistor. Connect

 

LED directly between this pin and +5V Out.

Utilities B

 

Reset-

Connection between this pin and Ground will generate a Reset

 

condition.

ATX Power

When ATX is enabled, a momentary contact between this pin and

 

Ground causes the CPU to turn on, and a contact of 4 seconds or

 

longer will generate a power shutdown. ATX power control is enabled

 

with a jumper on jumper block J10 (see page 14).

KB Lock

When this pin is connected to Ground, the keyboard and mouse inputs

 

are ignored.

IR RX, IR TX

IrDA pins. Can be connected directly to an IrDA transceiver.

+5V In

Connected to +5V input power on J11 (see page 9). This pin is not

 

switched by ATX control. This pin is provided for auxiliary use such as

 

front panel lighting or other circuitry at the user’s discretion.

Connector Part Numbers

J3 plug on CPU board:

3M / Robinson Nugent no. P50E-080P1-S1-TG

Both cable-mount and board-mount connectors are available to mate with J3:

Cable-mount socket:

3M / Robinson Nugent no. P50E-080S-TG

Board-mount socket:

3M / Robinson Nugent no. P50-080S-R1-TG

Prometheus-LC CPU User Manual V1.0

Page 8

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Diamond Systems PR-Z16-LC-ST, Low-Power PC/104 CPU Board With ZFx86 Processor user manual COM1 COM4, Connector Part Numbers

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