Instruction Leaflet IL032019EN
Effective December 2015
Version 2.0
245U-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 245U-E to
earth/ground.
2. Install the antenna.
3. Connect the 245U-E to a DC power supply and power on.
4. Connect the 245U-E to your computer via Ethernet and
configure the 245U-E. Refer to the user manual for
configuration details.
Antenna installation
When selecting an antenna, consider radio proximity. Use
Figure 1 as a guide for installing an antenna and attaching it to
the 245U-E.
NOTE
Figure 1. Antenna Installation
This equipment is suitable for use
in Class I Division 2 groups A, B,
C and D hazardous locations, or
nonhazardous locations only.
Antenna*
1 Wavelength
(minimum)
Wavelengths:
2.4 GHz = 5.1" (13 cm)
5 GHz = 2.4" (6 cm)
WARNING
EXPLOSION HAZARD
Stress
Relief
Loop
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.
Weatherproof
Connections
(recommended:
3M™ 23 selfbonding tape)
Surge Arrestor
(recommended)
Coaxial Cable
Statutory requirements
FCC: Unlicensed operation limits
the radio power. High gain aerials
may only be used to compensate
for cable losses.
GND
Mast
245U-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 IL032019EN
245U-E wireless Ethernet modem installation guide
EATON_245U-E Install Guide

Effective December 2015
Version 2.0
RS-232 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 EN60079-0.
100M
LINK
RUN
SETUP
ETHERNET
If the wireless Ethernet modem is installed in a hazardous
environment, coaxial cable must be installed in a metallic conduit,
per NEC requirements.
RD
TD
SG
RTS
 WARNING
CTS
DSR
DTR
DCD
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 following illustration shows the ports and switches on the
245U‑E. The Ethernet port is wired for a hub or switch.
Factory
Default
Switch
B A
LINK
RUN
B A
SETUP
ETHERNET
(HUB)
2
3
3
5
5
7
7
8
8
6
6
4
4
1
1
RS-232
B
A
RS-485
(DCE)
+ COM DIO
SUPPLY
RJ-45 Ethernet Port
(Connects to hub or switch)
RS-485 Resistor
Termination Switch
SUPPLY
245U to DCE (Modem)
RD
RD
TD
TD
SG
SG
RTS
RTS
CTS
CTS
DSR
DSR
DTR
DTR
2
2
3
3
5
5
7
7
8
8
6
6
4
4
1
1
DCD
DCD
DB-9 FEMALE
(DTE is Male)
DB-9 MALE
(245U is Female)
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
DB-9 MALE
(DCE is Female)
RS-485 connections
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.
RS-232 Port
100M
2
DB-9 MALE
(245U is Female)
B
A
RS-485
(DCE)
245U to DTE (Host)
Digital Output will activate for approximately 5 seconds during the
device power up sequence.
The non-metallic cover of the wireless Ethernet modem constitutes an
electrostatic discharge hazard. Clean only with a damp cloth.
RS-232
(HUB)
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
-
Digital input and output wiring
Power supply wiring
The digital input/output (DIO) channel can be wired as either input or
output.
The module power supply
–Ve terminal is not isolated
from earth/ground.
B A
Digital Output
Digital Input
B A
B
A
RS-485
B A
-++ COM DIO
SUPPLY
B A
B A
* Connect the negative
( – ) supply terminal
and the M4 GND screw
(located on the rear of
the module) to earth/
ground as close to the
unit as possible.
A
+
B
A
RS-485
9-30 Vdc
Supply
2A Fuse or
Circuit Breaker
CAUTION! Avoid ground loops.
Eaton
1000 Eaton Boulevard
Cleveland, OH 44122
United States
Eaton.com
Eaton’s wireless business
www.eaton.com/wireless
+ COM
DIO
COM DIO
RS-232
(DCE)
SUPPLY
B A
B
A
RS-485
+ COM
COM DIO
DIO
SUPPLY
DC Load
(relay)
Max
30 Vdc
0.5A
Connect to Ground as close
to the module as possible
© 2015 Eaton
All Rights Reserved
Printed in USA
Publication No. IL032019EN
December 2015
Voltage-Free Contact
or Transistor Device
Eaton is a registered trademark.
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of their respective owners.