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Gauge Wire
Use the largest gauge wire that you can. Most connector manufacturers have a
maximum gauge wire they recommend for their pins. Try going one size larger; it
usually works and the extra copper will help your system perform properly over time.
Contact Points
WinSystems' boards mostly use connectors with gold finish contacts. Gold finish
contacts are used exclusively on high speed connections. Power and lower speed
peripheral connectors may use a tin finish as an alternative contact surface. It is critical
that the contact material in the mating connectors is matched properly (gold to gold and
tin to tin). Contact areas made with dissimilar metals can cause oxidation/corrosion
resulting in unreliable connections.
Pin Contacts
Often the pin contacts used in cabling are not given enough attention. The ideal choice
for a pin contact would include a design similar to Molex's or Trifurcon's design, which
provides three distinct points to maximize the contact area and improve connection
integrity in high shock and vibration applications.
Power Down
Make sure that power has been removed from the system before making or breaking
any connections.
Power Supply OFF—The power supply should always be off before it is connected to
the I/O Module. Do not hot-plug the PPM-C407 on a host platform that is already
powered.
I/O Connections OFF—I/O Connections should also be off before connecting them to
the embedded computer modules or any I/O cards. Connecting hot signals can cause
damage whether the embedded system is powered or not.
Mounting and Protecting the I/O Module
The PPM-C407 must be mounted properly to avoid damage. Standoff kits are available
and recommended for use with the PPM-C407.
•
KIT-PCM-STANDOFF-4: Four piece Nylon Hex PC/104 Standoff Kit
•
KIT-PCM-STANDOFF-B-4: Four piece Brass Hex PC/104 Standoff Kit
www.winsystems.com
PPM-C407/Best Practices
Page 54
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