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ThinkCore W315/325/W345 Hardware User’s Manual Hardware Connection Description
3-3
Wiring Requirements
This section describes how to connect serial devices to the embedded computer.
You should read and follow these common safety precautions before proceeding with the
installation of any electronic device:
y Use separate paths to route wiring for power and devices. If power wiring and device wiring
paths must cross, make sure the wires are perpendicular at the intersection point.
NOTE: Do not run signal or communication wiring together with power wiring in the same
wire conduit. To avoid interference, wires with different signal characteristics should be routed
separately.
y Use the type of signal transmitted through a wire to determine which wires should be kept
separate. The rule of thumb is that wiring that shares similar electrical characteristics can be
bundled together.
y Keep input wiring and output wiring separate.
y It is advisable to label the wiring to all devices in the system.
ATTENTION
Safety First!
Be sure to disconnect the power cord before installing and/or wiring your W315/325.
Wiring Caution!
Calculate the maximum possible current in each power wire and common wire. Observe all
electrical codes dictating the maximum current allowable for each wire size.
If the current goes above the maximum ratings, the wiring could overheat, causing serious
damage to your equipment.
Temperature Caution!
Be careful when handling the unit. When the unit is plugged in, the internal components generate
heat, and consequently the outer casing may feel hot to the touch.
Connecting the Power
The PC’s power source should be provided by a UL listed class 2 or “Limited Power Source”
(LPS), with external adaptor output rated 12 to 48 VDC, minimum 1.2A. If the power is supplied
properly, the “Ready” LED will glow a solid green after a 25 to 30 second delay.
Grounding the Unit
Grounding and wire routing help limit the effects of noise due to electromagnetic interference
(EMI). Before connecting any devices, run a ground wire from the ground screw to the grounding
surface.