MOXA EtherDevice Switch
EDS-308/305 Hardware Installation Guide
Third Edition, July 2004
The MOXA EtherDevice™ Smart Switches, EDS-308/305 Series, are 8- and 5port Ethernet Switches that provide an economical solution for your Ethernet
connection, and the built-in smart alarm function helps system maintainers
monitor the health of your Ethernet network.
These products have a wide operating temperature range, from -40 to 75°C,
and are designed to withstand a high degree of vibration and shock. The rugged
hardware design makes EDS-308/305 Series perfect for ensuring that your
Ethernet equipment can withstand critical industrial applications, such as in
hazardous locations (Class 1 Division 2/ Zone 2), and complies with FCC,
TÜV, UL, and CE Standards.
Throughout this Hardware Installation Guide, we use EDS as
an abbreviation for MOXA EtherDevice Switch:
EDS = MOXA EtherDevice Switch
Package Checklist
MOXA EtherDevice Switch is shipped with the following items. If any of
these items is missing or damaged, please contact your customer service
representative for assistance.
MOXA EtherDevice™ Switch
Hardware Installation Guide
MOXA Product Warranty booklet
Protective caps for unused ports
High Performance Network Switching Technology
10/100BaseT(X) (RJ-45), 100BaseFX (SC type, Multi/Single mode)
IEEE 802.3/802.3u/802.3x
Store and Forward switching process type, 1024 address entries
10/100M, Full/Half-Duplex, MDI/MDIX auto-sensing
Industrial Grade Reliablity
Power failure, port break alarm by relay output
Redundant dual DC power inputs
Rugged Design
Operating temperature ranges from 0 to 60℃, or extended operating
temperature from -40 to 75°C for (-T) models
IP 30, rugged high-strength case
DIN-Rail or panel mounting ability
Panel Layout of EDS-305 series
Grounding screw
Terminal block for power input P1/P2
and relay output
Heat dissipation orifices
Dip switch
Power input P1 LED
Power input P2 LED
Fault LED
10/100BaseT(X) Port
TP port’s 100 Mbps LED
TP port’s 10 Mbps LED
Model Name
100BaseFX Port
FX port’s 100 Mbps LED
Screw hole for wall mounting kit
DIN-Rail kit
Panel Layout of EDS-308 series
Grounding screw
Terminal block for power input P1/P2
and relay output
Heat dissipation orifices
Dip switch
Power input P1 LED
Power input P2 LED
Fault LED
10/100BaseT(X) Port
TP port’s 100 Mbps LED
TP port’s 10 Mbps LED
Model Name
100BaseFX Port
FX port’s 100 Mbps LED
Screw hole for wall mounting kit
DIN-Rail kit
Mounting Dimensions
DIN-Rail Mounting
The aluminum DIN-Rail attachment plate should already be fixed to the back
panel of EDS when you take it out of the box. If you need to reattach the
DIN-Rail attachment plate to EDS, make sure the stiff metal spring is situated
towards the top, as shown in the figures below.
Insert the top of the DIN-Rail into the
slot just below the stiff metal spring.
The DIN-Rail attachment unit will
snap into place as shown below.
To remove MOXA EtherDevice Switch from the DIN-Rail, simply reverse
Steps 1 and 2 above.
Wall Mounting (OPTIONAL)
For some applications, you will find it convenient to mount MOXA
EtherDevice Switch on the wall, as illustrated below.
Remove the aluminum DIN-Rail attachment plate from MOXA EtherDevice
Switch’s rear panel, and then attach the wall mount plates, as shown in the
diagram below.
Mounting MOXA EtherDevice Switch on the wall
requires 4 screws. Use the Switch, with wall mount
plates attached, as a guide to mark the correct locations
of the 4 screws. The heads of the screws should be less
than 6.0 mm in diameter, and the shafts should be less
than 3.5 mm in diameter, as shown in the figure at the
NOTE Before tightening screws into the wall, make sure
the screw head and shank size are suitable by
inserting the screw into one of the keyholeshaped apertures of the Wall Mounting Plates.
Do not screw the screws in all the way—leave about 2
mm to allow room for sliding the wall mount panel
between the wall and the screws.
STEP 3: Once the screws are fixed in the wall, insert the four screw heads
through the large parts of the keyhole-shaped apertures, and then
slide MOXA EtherDevice Switch downwards, as indicated below.
Tighten the four screws for more stability.
Wiring Requirements
Do not disconnect modules or wires unless the power supply has been
switched off or the area is known to be nonhazardous.
The devices may only be connected to the supply voltage shown on
the type plate.
The devices are designed for operation with a safety extra-low voltage.
Thus, they may only be connected to the supply voltage connections
and to the signal contact with the safety extra-low voltages (SELV) in
compliance with IEC950/ EN60950/ VDE0805.
Substitution of components may impair suitability for Class
I, Division 2 and Zone 2.
These devices must be supplied by a SELV source as defined in
the Low Voltage Directive 73/23/EEC and 93/68/EEC.
This equipment has been evaluated as EEx nC IIC T4 equipment
under DEMKO Certificate No. 03 ATEX 0324537U. Each module
is marked
II 3G and is suitable for use in Zone 2 Explosive
Atmospheres. The device must be installed in a minimum IP 54
enclosure as defined in IEC 60529 and EN 60529.
This unit is a building-in type. The installation into a certain
end equipment shall comply with fire enclosure request of
IEC 60950/EN60950 or similar sentence.
Safety First!
Be sure to disconnect the power cord before installing and/or
wiring your MOXA EtherDevice Switch.
Calculate the maximum possible current in each power wire
and common wire. Observe all electrical codes dictating the
maximum current allowable for each wire size.
If the current goes above the maximum ratings, the wiring
could overheat, causing serious damage to your equipment.
You should also pay attention to the following points:
Use separate paths to route wiring for power and devices. If power wiring
and device wiring paths must cross, make sure the wires are perpendicular
at the intersection point.
NOTE: Do not run signal or communications wiring and power wiring in
the same wire conduit. To avoid interference, wires with different signal
characteristics should be routed separately.
You can use the type of signal transmitted through a wire to determine
which wires should be kept separate. The rule of thumb is that wiring that
shares similar electrical characteristics can be bundled together.
Keep input wiring and output wiring separated.
It is strongly advised that you label wiring to all devices in the system when
Grounding MOXA EtherDevice Switch
Grounding and wire routing help limit the effects of noise due to
electromagnetic interference (EMI). Run the ground connection from the
ground screw to the grounding surface prior to connecting devices.
This product is intended to be mounted to a well-grounded
mounting surface such as a metal panel.
Wiring the Alarm Contact
The Alarm Contact consists of the two middle contacts of the terminal block on
EDS’s top panel. You may refer to the next section for detailed instructions on
how to connect the wires to the terminal block connector, and how to attach the
terminal block connector to the terminal block receptor.
In this section, we will explain the meaning of the two contacts used to connect
the Alarm Contact.
FAULT: The two middle contacts of the
6-contact terminal block connector are used to
detect both power faults and port faults. The two
wires attached to the Fault contacts form an open
circuit when:
1. EDS has lost power from one of the DC
power inputs.
2. One of the ports for which the corresponding
PORT ALARM Dip Switch is set to ON is not
properly connected.
If neither both of these two conditions occur, the
Fault circuit will be closed.
Wiring the Redundant Power Inputs
The top two contacts and the bottom two contacts of the 6-contact terminal
block connector on EDS’s top panel are used for EDS’s two DC inputs. Top
and front views of one of the terminal block connectors are shown here.
STEP 1: Insert the negative/positive DC wires
into the V-/V+ terminals.
STEP 2: To keep the DC wires from pulling
loose, use a small flat-blade screwdriver to
tighten the wire-clamp screws on the front of the
terminal block connector.
STEP 3: Insert the plastic terminal block
connector prongs into the terminal block receptor,
which is located on EDS’s top panel.
Before connecting EDS to the DC power inputs, make sure the
DC power source voltage is stable.
Communication Connections
EDS-308 models have 6, 7, or 8 10/100BaseT(X) Ethernet ports, and 2, 1, or 0
(zero) 100 BaseFX (SC-type connector) fiber ports. EDS-305 models have 4 or
5 10/100BaseT(X) Ethernet ports, and 1 or 0 (zero) 100 BaseFX (SC-type
connector) fiber ports.
10/100BaseT(X) Ethernet Port Connection
The 10/100BaseT(X) ports located on EDS’s front panel are used to connect to
Ethernet-enabled devices.
Below we show pinouts for both MDI (NIC-type) ports and MDI-X
(HUB/Switch-type) ports, and also show cable wiring diagrams for
straight-through and cross-over Ethernet cables.
RJ45 (8-pin, MDI) Port Pinouts RJ45 (8-pin, MDI-X) Port Pinouts
RJ45 (8-pin) to RJ45 (8-pin) Straight-Through Cable Wiring
RJ45 (8-pin) to RJ45 (8-pin) Cross-Over Cable Wiring
100BaseFX Ethernet Port Connection
The concept behind the SC port and cable is quite straightforward. Let’s
suppose you are connecting devices I and II. Contrary to electrical signals,
optical signals do not require a circuit in order to transmit data. Consequently,
one of the optical lines is used to transmit data from device I to device II, and
the other optical line is used transmit data from device II to device I, for
full-duplex transmission.
All you need to remember is to connect the Tx (transmit) port of device I to the
Rx (receive) port of device II, and the Rx (receive) port of device I to the Tx
(transmit) port of device II. If you are making your own cable, we suggest
labeling the two sides of the same line with the same letter (A-to-A and B-to-B,
as shown below, or A1-to-A2 and B1-to-B2).
SC-Port Pinouts
SC-Port to SC-Port Cable Wiring
This is Class 1 Laser/LED product. Do not stare into the Laser
Redundant Power Inputs
Both power inputs can be connected simultaneously to live DC power sources.
If one power source fails, the other live source acts as a backup, and
automatically supplies all of MOXA EtherDevice Switch’s power needs.
Alarm Contact
MOXA EtherDevice Switch has one Alarm Contact located on the top panel.
For detailed instructions on how to connect the Alarm Contact power wires to
the two middle contacts of the 6-contact terminal block connector, see the
Wiring the Alarm Contact section above. A typical scenario would be to
connect the Fault circuit to a warning light located in the control room. The
light can be set up to switch on when a fault is detected.
The Alarm Contact has two terminals that form a Fault circuit for connecting to
an alarm system. The two wires attached to the Fault contacts form an open
circuit when (1) EDS has lost power from one of the DC power inputs, or (2)
one of the ports for which the corresponding PORT ALARM Dip Switch is set
to ON is not properly connected.
If neither of these two conditions occur, the Fault circuit will be closed.
Dip Switch Setting
EDS 308 series dip switch
EDS 305 series dip switch
ON: Enables the corresponding PORT Alarm. If the port’s link fails, the relay
will form an open circuit and the fault LED will light up.
Off: Disables the corresponding PORT Alarm. The relay will form a closed
circuit and the Fault LED will never light up.
— 10 —
LED Indicators
The front panel of MOXA EtherDevice Switch contains several LED indicators.
The function of each LED is described in the table below.
Power is not being supplied to
power input P1
Power is being supplied to
power input P2
Power is not being supplied to
power input P2
When the corresponding PORT
alarm is enabled, and the port’s
link is inactive.
When the corresponding PORT
alarm is enabled and the port’s
link is active, or when the
corresponding PORT alarm is
TP port’s 10 Mbps link is active
Data is being transmitted at 10
Power is being supplied to
power input P1
TP Port’s 10 Mbps link is
TP port’s 100 Mbps link is active
Data is being transmitted at 100
100BaseTX Port’s link is inactive
FX port’s 100 Mbps is active
Data is being transmitted at 100
100BaseFX port is inactive
Auto MDI/MDI-X Connection
The Auto MDI/MDI-X function allows users to connect MOXA EtherDevice
Switch’s 10/100BaseTX ports to any kind of Ethernet device, without paying
attention to the type of Ethernet cable being used for the connection. This
means that you can use either a straight-through cable or cross-over cable to
connect EDS to Ethernet devices.
— 11 —
Fiber Ports
MOXA EtherDevice Switch’s fiber switched ports operate at a fixed 100 Mbps
speed and full-duplex mode to provide the best performance. The fiber ports
are factory-built as either a multi-mode or single-mode SC connector.
Consequently, you should use fiber cables that have SC connectors at both
ends. When plugging the connector into the port, make sure the slider guide is
positioned to the right side so that it fits snuggly into the port.
The 100 Mbps fiber ports are switched ports, and perform as a domain,
providing a high bandwidth backbone connection that supports long fiber cable
distances (up to 2 km for multi-mode, and 15 km for single-mode) for
installation versatility.
Dual Speed Functionality and
MOXA EtherDevice Switch’s 10/100 Mbps switched RJ45 port auto negotiates
with the connected device for the fastest data transmission rate supported by
both devices. All models of MOXA EtherDevice Switch are plug-and-play
devices, so that software configuration is not required at installation, or during
maintenance. The half/full duplex mode for the switched RJ45 ports is user
dependent and changes (by auto-negotiation) to full or half duplex, depending
on which transmission speed is supported by the attached device.
Switching, Filtering, and Forwarding
Each time a packet arrives at one of the switched ports, a decision is made to
either filter or forward the packet. Packets with source and destination
addresses belonging to the same port segment will be filtered, constraining
those packets to one port, and relieving the rest of the network from the need to
process them. A packet with destination address on another port segment will
be forwarded to the appropriate port, and will not be sent to the other ports
where it is not needed. Packets that are used in maintaining the operation of the
network (such as the occasional multi-cast packet) are forwarded to all ports.
MOXA EtherDevice Switch operates in the store-and-forward switching mode,
which eliminates bad packets and enables peak performance to be achieved
when there is heavy traffic on the network.
Switching and Address Learning
MOXA EtherDevice Switch has an address table that can hold up to 1K node
addresses, which makes it suitable for use with large networks. The address
tables are self-learning, so that as nodes are added or removed, or moved from
one segment to another, MOXA EtherDevice Switch automatically keeps up
with new node locations. An address-aging algorithm causes the least-used
addresses to be deleted in favor of newer, more frequently used addresses. To
reset the address buffer, power down the unit and then power it back up.
— 12 —
Auto-Negotiation and Speed Sensing
All of MOXA EtherDevice Switch’s RJ45 Ethernet ports independently
support auto-negotiation for speeds in the 10BaseT and 100BaseTX modes,
with operation according to the IEEE 802.3u standard. This means that some
nodes could be operating at 10 Mbps, while at the same time, other nodes are
operating at 100 Mbps.
Auto-negotiation takes place when an RJ45 cable connection is made, and then
each time a LINK is enabled. MOXA EtherDevice Switch advertises its
capability for using either 10 Mbps or 100 Mbps transmission speeds, with the
device at the other end of the cable expected to similarly advertise. Depending
on what type of device is connected, this will result in agreement to operate at a
speed of either 10 Mbps or 100 Mbps.
If a MOXA EtherDevice Switch RJ45 Ethernet port is connected to a
non-negotiating device, it will default to 10 Mbps speed and half-duplex mode,
as required by the IEEE 802.3u standard.
Forward and Filtering
Packet Buffer Memory
Processing Type
Address Table Size
RJ45 Ports
Fiber Ports
LED Indicators
DIP Switch
Alarm Contact
Optical Fiber
IEEE802.3, 802.3u, 802.3x
148810 pps
256 KB
Store and For-ward, with IEEE802.3x full duplex,
non-blocking flow control
1K uni-cast addresses
Less than 5 µs
10/100BaseT(X) auto negotiation speed, F/H duplex
mode, and auto MDI/MDI-X connection
100BaseFX ports (SC connector)
Power, Faults, ACT, LNK, 10/100
Port break alarm mask
One relay output with current carrying capacity of
1A @ 24 VDC
Single mode fiber for 15 km,
Multi mode fiber for 2 km
1310 nm
-15 dBm (Single), -20 dBm (Multi)
-6 dBm (Single), -14 dBm (Multi)
-36 to -32 dBm (Single), -34 to -30 dBm (Multi)
Min. TX Output
Max. TX Output
Input Voltage
12 to 48 VDC, redundant inputs
Input Current @ 24VDC 0.25 A (EDS-305, EDS-305-M, EDS-305-S,
0.35 A (EDS-308-M, EDS-308-S, EDS-308-MM,
— 13 —
Overload Current
Reverse Polarity
Operating Temperature
Storage Temperature
Ambient Relative
Regulatory Approvals
Hazardous Location
Free Fall
Removable Terminal Block
1.1 A (EDS-305, EDS-305-M, EDS-305-S,
EDS-308) 1.6 A (EDS-308-M, EDS-308-S,
EDS-308-MM, EDS-308-SS)
IP30 protection, aluminum case
53.6 x 135 x 105 mm (W x H x D)
0.63 kg
DIN-Rail, Wall Mounting
0 to 60oC (32 to 140oF), -40 to 75oC (-40 to 167oF)
-40 to 85oC (-40 to 185oF)
5 to 95% (non-condensing)
UL60950, UL 508, CSA C22.2 No. 60950,
UL/cUL Class I, Division 2, Groups A, B, C and D
ATEX Class I, Zone 2, EEx nC IIC
FCC Part 15, CISPR (EN55022) class A
EN61000-4-2 (ESD), Level 3
EN61000-4-3 (RS), Level 3
EN61000-4-4 (EFT), Level 3
EN61000-4-5 (Surge), Level 3
EN61000-4-6 (CS), Level 3
IEC 60068-2-27
IEC 60068-2-32
IEC 60068-2-6
5 years
— 14 —
MOXA Internet Services
Customer satisfaction is our number one concern, and to ensure that
customers receive the full benefit of our products, Moxa Internet
Services has been set up to provide technical support, driver updates,
product information, and user’s manual updates.
The following services are provided
E-mail for technical support
World Wide Web (WWW) Site for product information:
Revision History
Revision Date
April 17, 2004
July 1, 2004
Revision Details
Updated the edition of this
manual on the title page.
Changed the Moxa logo on the
title page.
Added several “Attention”
Added one product feature:
Operating temperature ranges
from 0 to 60°C, or extended
operating temperature
from –40 to 75°C for (-T)
Revise 100BaseFX for fiber
optic port
— 15 —
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