User`s manual

EM-1240 Hardware User’s Manual EM-1240-DK Functionality
Wiring Requirements
This section describes how to connect the EM-1240 Development Kit to serial devices.
You should heed the following 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 and 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.
Be sure to disconnect the power cord before installing and/or wiring your EM-1240 Development
Kit.
ATTENTION
Safety First!
Be sure to disconnect the power cord before installing and/or wiring your EM-1240
Development Kit.
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 EM-1240 Development Kit. When plugged in, EM-1240 Development
Kit’s internal components generate heat, and consequently the outer casing may feel hot to the
touch.
Connecting the Power
You may use either a power jack or 3-pin terminal block for connecting the power. The power
input range of the EM-1240-DK is from 12 to 48 VDC. Note that you may only use one power
input source at the same time. DO NOT connect the power to both the power jack and terminal
block simultaneously. You may use the power on-off switch to turn on and turn off the power to
the Development Kit. If the power is properly supplied, the “Power” LED will light up
immediately and the “Ready” LED will glow a solid green after a 25 to 30 second delay.
Grounding the EM-1240 Development Kit
Grounding and wire routing help limit the effects of noise due to electromagnetic interference
(EMI). Run the ground wire from the ground screw to the grounding surface prior to connecting
devices.
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