Instruction Leaflet IL032045EN
Effective Febuary 2016 Version 2.0
945U-E wireless Ethernet modem installation guide
NOTE
This equipment is suitable for use in Class I Division 2 groups A, B,
C and D hazardous locations, or nonhazardous locations only.
WARNING
EXPLOSION HAZARD
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.
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
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
Wavelength: 13" (33 cm) Antenna*
Stress
Relief
Loop
1 Wavelength
(minimum)
Weatherproof
Connections
(recommended:
3M ™ 23 selfbonding tape)
Statutory requirements
FCC: Unlicensed operation limits the radio power. High gain aerials may only be used to compensate for cable losses. .
Surge Arrestor
(recommended)
Coaxial Cable
GND Mast
945U-E
M4 x 5 mm
Module
Connection
GND at least 11 AWG (4 mm 2 )
Provide good ground connection to mast, module, and surge arrestor.
If ground conditions are poor, use more than one stake.
Earth Stake
Earth Conductor at least 5 AWG
(16 mm 2 )
* For maximum range, install above local obstructions.
Instruction Leaflet IL032045EN
Effective Febuary 2016
Version 2.0
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.
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
RS-232 Port
945U-E wireless Ethernet modem installation guide
EATON_945U-E Install Guide
RS-485 connections
Use shielded twisted pair cable to interconnect modules to reduce potential RFI.
Maintain the polarity of the two
RS-485 wires.
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.
RS-232 connections
100M
RUN
SETUP
ETHERNET
(HUB)
LINK
RS-232
(DCE)
B A
RS-485
+
SUPPLY
COM DIO
B A
+
–
115S-xx
B A
B A
115S-xx
B A -
RS-485 SUPPLY
B A
B A
100M
RUN
SETUP
ETHERNET
(HUB)
LINK
RS-232
(DCE)
B A
RS-485
+
SUPPLY
COM DIO
B A
RJ-45 Ethernet Port
(connects to hub)
RS-485 Resistor
Termination Switch
Power supply wiring
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.
B A -
RS-485 SUPPLY
DIO
B A
B A
945U to DTE (Host)
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
8
6
4
5
7
2
3
1
8
6
4
5
7
2
3
1
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
DB-9 MALE
(945U is Female)
DB-9 FEMALE
(DTE is Male)
945U to DCE (Modem)
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
8
6
4
5
7
2
3
1
8
6
4
5
7
2
3
1
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
DB-9 MALE
(945U is Female)
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 Digital Input
B A
RS-485
-
(DCE)
+
SUPPLY
COM
B A
B A
B A
RS-485
+
SUPPLY
COM
B A
B A
9-30 Vdc
Supply
CAUTION! Avoid ground loops.
Eaton
1000 Eaton Boulevard
Cleveland, OH 44122
United States
Eaton.com
Eaton’s wireless business www.eaton.com/wireless
2A Fuse or
Circuit Breaker
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. IL032045EN
Febuary 2016
Voltage-Free Contact or Transistor Device
Eaton is a registered trademark.
All other trademarks are property of their respective owners.
