Emerson 781S User manual

Quick Start Guide
00825-0700-4410, Rev AF
July2023
Emerson Wireless 781S Smart
Antenna

Safety messages
NOTICE
This guide provides basic guidelines for the Emerson Wireless 781S Smart Antenna. It does
not provide instructions for diagnostics, maintenance, service, or troubleshooting. Refer to
the Emerson Wireless 1410S Gateway and 781S Smart Antenna Reference Manual for more
information and instructions. The manuals and this guide are available electronically on
Emerson.com.
WARNING
Failure to follow these installation guidelines could result in death or serious injury.
Ensure only qualified personnel perform the installation.
WARNING
Explosions could result in death or serious injury.
Installation of the transmitters in a hazardous environment must be in accordance with the
appropriate local, national, and international standards, codes, and practices. Kindly review
the Product Certifications section for any restrictions associated with a safe installation.
WARNING
Electrical shock could cause death or serious injury.
Avoid contact with the leads and terminals. High voltage that may be present on leads can
cause electrical shock.
WARNING
Physical access
Unauthorized personnel may potentially cause significant damage to and/or
misconfiguration of end users’ equipment. This could be intentional or unintentional and
needs to be protected against.
Physical security is an important part of any security program and fundamental in protecting
your system. Restrict physical access by unauthorized personnel to protect end users’ assets.
This is true for all systems used within the facility.
NOTICE
This device complies with Part 15 of the Federal Communication Commission (FCC)
Rules. Operation is subject to the following conditions:
This device may not cause harmful interference.
This device must accept any interference received, including interference that may cause
undesired operation.
This device must be installed to ensure a minimum antenna separation distance of 8 in. (20
cm) from all persons.
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Contents
Wireless planning.........................................................................................................................5
Intended use.................................................................................................................................7
Physical installation..................................................................................................................... 8
Best practices............................................................................................................................. 11
Verify operation..........................................................................................................................12
Product certifications................................................................................................................ 13
Reference data........................................................................................................................... 24
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1 Wireless planning
1.1 Power up sequence
For a simpler and faster network installation, first install the Emerson
Wireless Smart Antenna and wireless inputs and outputs and make
sure they are functioning properly. Next, power up wireless field
devices in order of proximity from the antenna, beginning with the
closest.
1.2 Antenna location
Mount the antenna in a location that allows convenient access to the
host system network (wireless inputs/outputs) as well as the wireless
field device network.
Figure 1-1: Antenna mounting location
A. Control room
B. RS-485 cable
C. Emerson Wireless 781S Smart Antenna
D. Mast or pipe
E. Infrastructure
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1.3 Antenna position
Position the Emerson 781S Smart Antenna vertically and
approximately 3 ft (1 m) from large structures, buildings, or
conductive surfaces to allow for clear communication to other
devices.
If installing multiple antennas, it is important that the antennas have
3 ft (1 m) of horizontal separation from one another.
Figure 1-2: Antenna position
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2 Intended use
2.1 System architecture
The smart antenna must be used in conjunction with a network
manager or network gateway.
The smart antenna then functions as a translator between the wired
network and a wireless field network.
Figure 2-1: Example system architecture
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3 Physical installation
3.1 Mount the antenna to a pipe
Procedure
1. Insert U-bolt around 2-in. pipe or mast, through the saddle,
through the L-shaped bracket, and through the washer plate.
2. Use a ½-in. socket-head wrench to fasten the nuts to the U-
bolt.
3. Secure the antenna to the L-shaped bracket with a 5/16-in.
threaded bolt.
4. Use a 5/16-in. wrench to tighten the screw into the housing.
Figure 3-1: Mounting
3.2 Connect to power and data
The Emerson 781S is completely prewired and only needs to be
connected and powered on the Gateway end. The housing is
permanently sealed on the Emerson 781S.
Prerequisites
If operating with more than one antenna, it is important the antenna
is always connected to the antenna terminal connection 1 port.
Procedure
1. Connect the positive power lead to the “+” power terminal and
the negative power lead to the “–” terminal.
2. Connect the data + lead to the “A (+)” terminal and the data –
lead to the “B (–)” terminal.
3. Connect the grounding wire to the Gateway’s shield
connection.
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4. If connecting multiple antennas, repeat this process for
terminal connection 2.
Figure 3-2: Wiring guide
A. Power
B. Data
Red Positive
Blk (Black) Negative
Wht (White) RS-485 comm A
Blu (Blue) RS-485 comm B
Figure 3-3: Emerson Wireless 781S
A. Power output
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B. RS-485 comm
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