Manual PCI-WDG-CSM
15
Chapter 3: Option Selection
Refer to Figure 1-1, Block Diagram and Figure 3-1, Option Selection Map when reading this section of
the manual. Card operation is determined by jumper installation as described in the following paragraphs.
Relay Enable/Disable
Hold the card with the fingers at the bottom and the mounting bracket on the left. The relay-control
jumper is located alongside the relay at the left-hand side of the card. If no jumper is placed on the block,
the relay is always de-energized. If a jumper is placed between the two left-hand posts, the relay is
always energized when +5V power is on. If a jumper is placed between the two right-hand posts, the
relay is de-energized during reset (watchdog timeout), and the relay is energized on powerup. If you
desire to use the relay output, then the jumper should be placed between the right-hand posts.
Screw Terminals
Screw terminals located on the right-hand side of the card provide the means for connections of the
watchdog output to points inside the computer chassis. The top terminal provides the active-low
watchdog output. The next terminal provides a ground. The third terminal provides the complementary
active-high of the first terminal output. The fourth terminal down provides power to the computer fan and
the fifth terminal from the top provides pulse-width modulated control for fan speed. The bottom terminal
is an input that can re-start the fan.
ATX/Reset Button Header
For ATX supplies, the top left-hand side of the card has a four pin header to provide a ground to reset the
computer through a relay contact (same contacts on 25 pin I/O connector, pins 14 Common, and 15 NC).
Use the NC terminal with the “GND” jumper installed to apply a ground through the jumper and relay
contacts, then to the power good or reset line. This connection can alternately be connected to the reset
button pins on the mother board. The GND jumper must be removed if the reset button connection is
used. Upon boot up, the relay becomes energized.
LED Terminals
A connector for an external or on-board LED is provided at two solder pads labeled J2. The output is
limited by a 470 ohm resistor in series with a 5V output. This output is only active if the Buzzer option is
installed.
