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Power Wiring
The LMJA-8xxx-SM must be powered by an approved 24VDC power source. This can be either an external wall mount AC adapter (NB-
PS1), or other source of 24 volts DC.
The LMJA-8xxx-SM does not have an on/off switch. To apply power, plug in to either the Barrel power connector (1) or 2 position plug (2).
CAUTION
Communications Wiring
Before connecting cables, provide strain relief for them to prevent damage to the LMJA-8xxx-SM. Connect communications wiring to the
LMJA-8xxx-SM (see page 11), which include:
• RJ-45 Ethernet for PC or LAN connection
• RS-485 (2-position) for LMJA-8xxx-SM (BACnet MS/TP) connections. THIS MUST BE WATTSTOPPER LM-MSPT-xxxx - No other
version can be used!
Wiring an LMJA-8xxx-SM
Connect an RJ-45 Ethernet cable from a PC (or a network the PC is connected to) to the LMJA-8xxx-SM. See the "Ethernet"
section on the next page for details.
For each segment you are connecting to the LMJA-8xxx-SM (up to 2), attach one end of the LM-MSTP cable to a terminal block, as
shown on page 9 including RS-485 Bias switches settings for termination.
Connect the shield conductors from all network segments to earth ground at the Segment Manager. The LMNC-ENC1 enclosure
provides a ground lug for this purpose and is recommended. Do not connect the shield conductor(s) at any other device.
-OR-
Connect to a switch and to multiple routers, These components are usually housed inside an LMNC DLM Network Component Enclosure.
In this case, the LMJA-8xxx-SM connects to the switch using Ethernet cable, and each router connects to a segment using LM-MSTP cable.
The rules regarding termination and grounding still apply when connecting the cable to the router. See the wiring examples.
Earth Ground and Power
Earth grounding provides protection from electrostatic discharge or
other forms of EMI.
Depending on power sourced used:
• 2.1 (AC): Dedicated 24V transformer required, with neither side
of the transformer secondary tied to ground
• 2.2 (DC): Polarity is unimportant (uses on board diode bridge),
with neither leg tied to ground
• 2.3 (Wall-mount AC adapter, NB-PS1) instead of wiring 24V to
2-position connector
PREREQUISITE: A nearby earth ground point is needed. Before
making power terminations, de-energize the 24V power source. Do
not restore power until completing all other mounting and wiring.
1. Install the included earth ground wire to the controller's earth
ground spade lug and terminate the other end to a nearby
earth ground.
2. Unplug the controller's 2-position power connector plug and
terminate the 24V supply source (AC or DC) to the connector.
Leave connector unplugged for now.
Do not plug the power supply connector into the LMJA-8xxx-SM
controller until all other mounting and wiring is completed.
WIRING: EARTH GROUND AND POWER
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1
2
5
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