User`s manual

VPort 251 User’s Manual Getting Started
Wiring Requirements
ATTENTION
Be sure to disconnect the power cord before installing and/or wiring your Moxa VPort 251.
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.
You should also pay attention to the following:
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 communications wiring and power wiring in the same wire conduit. To avoid
interference, wires with different signal characteristics should be routed separately.
y You can 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 separated.
y It is strongly advised that you label wiring to all devices in the system when necessary.
Grounding the VPort 251
Grounding and wire routing help limit the effects of noise due to electromagnetic interference
(EMI). Run the ground connection from the ground screw to the grounding surface prior to
connecting devices.
ATTENTION
This product is intended to be mounted to a well-grounded mounting surface such as a metal
panel.
Wiring the Relay Output
In this section, we will explain the meaning of the two contacts used to connect the Relay Contact.
The VPort 251 has one set of relay outputs,
labeled RELAY 3 contacts on the 5-pin terminal
block on the VPort’s top panel are used for the
relay output.
The relay output can be configured for:
1. System alarm: such as for network disconnected.
2. Event alarm: such as for VMD (Video Motion Detection), video loss, and Digital Inputs.
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