Instruction Leaflet IL032045EN
Effective Febuary 2016
Version 2.0
945U-E wireless Ethernet modem
installation guide
Installation steps
This guide provides installation drawings and instructions
appropriate for most applications. For more information, refer to
the user manual.
1. Connect the GND terminal on the back of the 945U-E to
earth/ground.
2. Install the antenna.
3. Connect the 945U-E to a DC power supply and power on.
4. Connect the 945U-E to your computer via Ethernet and
configure the 945U-E. Refer to the user manual for
configuration details.
Antenna installation
NOTE
This equipment is suitable for use
in Class I Division 2 groups A, B,
C and D hazardous locations, or
nonhazardous locations only.
When selecting an antenna, consider radio proximity. For short
distance paths, check the receive signal level. If it exceeds
–40 dBm, a 20 dBm you must fit an attenuator in-line with the
coaxial cable. Do not use demonstration antennas for the final
installation.
Use Figure 1 as a guide for installing an antenna and attaching it
to the 945U-E.
Figure 1. Antenna Installation
WARNING
EXPLOSION HAZARD
Antenna*
Wavelength: 13" (33 cm)
Do not disconnect equipment while
the circuit is live or unless the area
is known to be free of ignitable
concentrations. Substitution of any
component may impair suitability for
Class I Division 2.
1 Wavelength
(minimum)
Stress
Relief
Loop
Statutory requirements
Weatherproof
Connections
(recommended:
3M™ 23 selfbonding tape)
Surge Arrestor
(recommended)
FCC: Unlicensed operation limits
the radio power. High gain aerials
may only be used to compensate
for cable losses. .
Coaxial Cable
GND
Mast
945U-E
Earth Conductor
at least 5 AWG
(16 mm2)
M4 x 5 mm
*For maximum
range, install
above local
obstructions.
GND
at least 11 AWG (4 mm2)
Earth Stake
Module
Connection
Provide good ground
connection to mast,
module, and surge
arrestor.
If ground conditions
are poor, use more
than one stake.
Instruction Leaflet IL032045EN
945U-E wireless Ethernet modem installation guide
EATON_945U-E Install Guide

Effective Febuary 2016
Version 2.0
RS-485 connections
NOTE
All connections must be SELV <50 Vac and <120 Vdc.
If the wireless Ethernet modem is installed as Category 3
equipment, it must be installed in an enclosure that maintains
an ingress protection rating of IP54 and meets the enclosure
requirements of EN 50014 or EN 60079-0.
If the wireless Ethernet modem is installed in a hazardous
environment, coaxial cable must be installed in a metallic conduit,
per NEC requirements.
Digital Output will activate for approximately 5 seconds during the
device power up sequence.
 WARNING
The wireless Ethernet modem enclosure contains aluminum and is
considered to constitute a potential risk of ignition by impact or friction.
This must be taken into account during installation.
The non-metallic cover of the wireless Ethernet modem constitutes an
electrostatic discharge hazard. Clean only with a damp cloth.
Use shielded twisted pair cable to
interconnect modules to reduce
potential RFI.
B A
B A
Maintain the polarity of the two
RS‑485 wires.
A
BB
A
RS-485
RS-485
Terminate each end of the
network with a 120-ohm resistor.
An on-board terminating resistor is
provided in the modem and can be
engaged by setting the DIP switch
on the end plate to ON.
+ COM DIO
SUPPLY
115S-xx
B
+
115S-xx
A
B
A
–
RS-232 connections
100M
LINK
RUN
The following illustration shows the ports and switches on the
945U‑E. The Ethernet port is wired for a hub or switch.
Factory
Default
Switch
SETUP
ETHERNET
RS-232
(HUB)
RS-232 Port
B
A
RS-485
(DCE)
SUPPLY
B A
100M
LINK
945U to DTE (Host)
RUN
B A
SETUP
ETHERNET
(HUB)
RS-232
B
A
RS-485
(DCE)
RD
TD
+ COM DIO
SUPPLY
SG
RTS
CTS
RJ-45 Ethernet Port
(connects to hub)
Power supply wiring
DTR
DCD
2
3
3
5
5
7
7
8
8
6
6
4
4
1
1
DB-9 MALE
(945U is Female)
The device power supply –Ve terminal is not isolated from earth/
ground.
* Connect the negative
( – ) supply terminal
and the GND screw
(located on the rear of
the module) to earth/
ground as close to the
device as possible.
Do not connect the
positive ( + ) supply
terminal to earth/
ground.
DSR
RS-485 Resistor
Termination Switch
2
B A
945U to DCE (Modem)
RD
RD
TD
TD
SG
SG
2
2
3
3
5
5
7
7
8
8
6
6
4
4
1
1
RTS
RTS
CTS
CTS
DSR
DSR
DTR
DTR
DCD
DCD
DB-9 FEMALE
(DTE is Male)
DB-9 MALE
(945U is Female)
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
DB-9 MALE
(DCE is Female)
Digital input and output wiring
The digital input/output (DIO) channel can be wired as either input or
output.
Digital Output
B A
B
A
RS-485
-++ COM DIO
SUPPLY
Digital Input
B A
B A
B A
B
A
RS-485
9-30 Vdc
Supply
+ COM
DIO
COM DIO
RS-232
(DCE)
SUPPLY
2A Fuse or
Circuit Breaker
Eaton’s wireless business
www.eaton.com/wireless
+ COM
COM DIO
DIO
SUPPLY
DC Load
(relay)
Max.
30 Vdc
0.5A
CAUTION! Avoid ground loops.
Eaton
1000 Eaton Boulevard
Cleveland, OH 44122
United States
Eaton.com
B A
B
A
RS-485
Connect to Ground as close
to the module as possible
© 2015 Eaton
All Rights Reserved
Printed in USA
Publication No. IL032045EN
Febuary 2016
Voltage-Free Contact
or Transistor Device
Eaton is a registered trademark.
All other trademarks are property
of their respective owners.