Eaton 945U-E Installation Manual - page 2
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Cleveland, OH 44122
United States
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945U-E wireless Ethernet modem installation guide
EATON_945U-E Install Guide
Instruction Leaflet
IL032045EN
Effective Febuary 2016
Version 2.0
© 2015 Eaton
All Rights Reserved
Printed in USA
Publication No. IL032045EN
Febuary 2016
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
RS-232
(DCE)
RS-485
SUPPLY
ETHERNET
(HUB)
SETUP
RUN
100M
LINK
B A
-
945U to DCE (Modem)
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
2
3
5
7
8
6
4
1
2
3
5
7
8
6
4
1
DB-9 MALE
(945U is Female)
DB-9 FEMALE
(DTE is Male)
945U to DTE (Host)
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
RD
TD
SG
RTS
CTS
DSR
DTR
DCD
2
3
5
7
8
6
4
1
2
3
5
7
8
6
4
1
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.
B A
RS-485
SUPPLY
B A
+
-
DIO
COM
Max.
30 Vdc
0.5A
DC Load
(relay)
COM DIO
B A
B A
Digital Input
Digital Output
RS-232
(DCE)
B A
RS-485
SUPPLY
B A
+
-
DIO
COM
Voltage-Free Contact
or Transistor Device
COM DIO
Connect to Ground as close
to the module as possible
NOTE
All connections must be SELV
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.
RS-232
(DCE)
B A
RS-485
SUPPLY
ETHERNET
(HUB)
SETUP
RUN
100M
LINK
B A
+
-
DIO
COM
Factory
Default
Switch
RS-232 Port
RJ-45 Ethernet Port
(connects to hub)
RS-485 Resistor
Termination Switch
B A
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
B A
+
-
DIO
COM
9-30 Vdc
Supply
2A Fuse or
Circuit Breaker
COM
+
-
B A
CAUTION! Avoid ground loops.
B A
RS-485
SUPPLY
B A
+
-
DIO
COM
B A
115S-xx
115S-xx
RS-485
B
A
B
A
B
A
–
+