Moxa Technologies IMC-21A IMC-21A User manual

P/N: 1802000210023
*1802000210023*
IMC-21A
Quick Installation Guide
Moxa Industrial Media Converter
Edition 5.1, July 2018
Technical Support Contact Information
www.moxa.com/support
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-free: 1-888-669-2872
Tel:
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-free: 800-820-5036
Tel:
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
2018 Moxa Inc. All rights reserved.

- 2 -
Overview
The Moxa Industrial Media Converter IMC-21A series consists of entry-
level 10/100BaseT(X) to 100BaseFX media converters that provide a
cost-effective solution, and are specially designed for reliable and stable
operations in harsh industrial environments.
NOTE
Throughout this Hardware Installation Guide, we use IMC as an
abbreviation for Industrial Media Converter:
IMC = Industrial Media Converter
Package Checklist
Moxa’s IMC-21A is shipped with the following items. If any of these
items is missing or damaged, please contact your customer service
representative for assistance.
•IMC-21A media converter
•Quick installation guide (printed)
•Warranty card
Features
•Power inputs: 12 to 48 VDC
•The TP port’s connection speed, Half/Full-duplex mode and
Force/Auto mode are all DIP switch selectable
•The fiber port’s Half/Full-duplex mode is DIP switch selectable
•Supports Link Fault Pass-Through (LFP)
•DIN-rail mountable
•Multimode and single-mode models with SC or ST fiber connectors
are available
•Operating temperature range from -40 to 75°C (T models)

- 3 -
Panel Layout
1. DIP switch
2. Reset button
3. Terminal block for power input and
grounding
4. Power input LED
5. 100BaseFX (SC/ST connector) port
6. FX port's 100 Mbps LED
7. FX port's FDX/COL LED
8. TP port’s 100 Mbps LED
9. TP port's 10 Mbps LED
10.
10/100BaseT(X) port
11.
DIN-rail kit
NOTE:
The IMC-21A series includes the
IMC
-21A-M-SC, IMC-21A-M-ST, and IMC-
21A
-S-SC.

- 4 -
Mounting Dimensions
DIN-Rail Mounting
The aluminum DIN-rail
attachment plate should be fixed
to the back panel of the IMC
-21A
when you take it out of the box. If
you need to reattach the DIN
-rail
attachment plate to the IMC
-21A,
make sure the stiff metal spring is
situated towards the top.
Wiring Requirements
ATTENTION
Safety First!
•
Be sure to disconnect the power cord before installing
and/or wiring your Moxa IMC.
•
Calculate the maximum possible current in each power wire
and common wire. Observe all electrical codes dictating
the
maximum current allowed for each wire size.
•
If the current goes above the allowed maximum
, the wiring
could overheat, causing serious damage to your equipment.

- 5 -
•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.
•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.
•We strongly advise that you label wiring to all devices in the
system.
Grounding the Moxa IMC
Grounding and wire routing help limit the effects
of no
ise due to electromagnetic interference
(EMI). Run the ground connection from the
right
most connector of the 3-contact terminal
block to the grounding surface
before
connecting
the devices.
ATTENTION
This product is
intended to be mounted to a well-grounded
mounting surface such as a metal panel.
Wiring the Power Inputs
The two leftmost contacts of the 3-contact terminal block connector on
the IMC’s top panel are used for the IMC’s DC inputs. Take the
following steps to wire the IMC’s DC power inputs:
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 term
inal block connector.
STEP 3:
Insert the plastic terminal block
connector prongs into the terminal block
receptor, which is located on IMC’s top panel.

- 6 -
Communication Connections
RJ45 Ethernet Port Connection
The IMC-21A has one 10/100BaseT(X) Ethernet port located on the
front panel for connecting to Ethernet-enabled devices.
Pinouts and cable wiring diagrams for both MDI (NIC-type) and MDI-X
(HUB/switch-type) ports for both straight-through and crossover
Ethernet cables are shown below:
MDI Port Pinouts
MDI-X Port Pinouts
8-pin RJ45
Pin
Signal
1
Tx+
2
Tx-
3
Rx+
6
Rx-
Pin
Signal
1
Rx+
2
Rx-
3
Tx+
6
Tx-
Straight-Through Cable Wiring
CrossOver Cable Wiring

- 7 -
Fiber Optic Port Connection
The concept behind the SC/ST port and cable is quite straightforward.
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 make your own
cables, 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
ST-Port Pinouts
ST-Port to ST-Port Cable Wiring
ATTENTION
This is a Class 1 Laser/LED product. To avoid causing serious
damage to your eyes, do not stare directly into the laser beam.

- 8 -
DIP Switch Settings
DIP No. Function ON
OFF
(Default setting)
1
Force Fiber Port Duplex
Half-duplex
Full-duplex
“OFF”: Forces Full-duplex on Fiber port.
“ON”: Forces Half-duplex on Fiber port.
2
Link Fault Pass Through
Disable
Enable
“OFF”: Enables “Link Fault Pass Through”, the link status on
the TX port will inform the FX port of the same device and
vice versa.
“ON”: Disables “Link Fault Pass Through”, the link status on
the TX port will not inform the FX port.
3
Force TP Duplex
Half-duplex
Full-duplex
(Only when Auto Negotiation (DIP 5) is disabled)
“OFF”: Forces Full-duplex on Ethernet port.
“ON”: Forces Half-duplex on Ethernet port.
4
Force TP Speed
10Mbps
100Mbps
(Only when Auto Negotiation (DIP 5) is disabled)
“OFF”: Forces 100Mbps on Ethernet port.
“ON”: Forces 10Mbps on Ethernet port.
5
Auto Negotiation
Disable
Enable
“OFF”: Enables “Auto Negotiation” function; the speed and
duplex states for each port link segment are automatically
configured using the highest performance interoperation
mode.
“ON”: Disables “Auto Negotiation” function; the speed and
duplex states depend on the DIP 3 & 4 configuration.
After changing the DIP switch setting, you will need to power off and
then power on the IMC-21A, or use a pointed object to hold the reset
button down for five seconds to activate the new setting.

- 9 -
LED Indicators
The front panel of the Moxa IMC contains several LED indicators. The
function of each LED is described in the table below.
LED
Color
State
Description
PWR AMBER
On
Power is being supplied to the power
input.
Off Power is not being supplied to the
power input.
100M
(FX) GREEN
On
FX port’s 100 Mbps link is active.
Blinking
Data is being transmitted at 100 Mbps.
Off
FX Port’s 100 Mbps link is inactive.
FDX/COL
(FX) GREEN
On
100BaseFX port is transmitting in full-
duplex mode.
Blinking
A data collision has occurred.
Off
100BaseFX port is transmitting in half-
duplex mode.
100M
(TP) GREEN
On
TP port’s 100 Mbps link is active.
Blinking
Data is being transmitted at 100 Mbps.
Off
TP port’s 100 Mbps link is inactive.
10M
(TP) GREEN
On
TP port’s 10 Mbps link is active.
Blinking
Data is being transmitted at 10 Mbps.
Off
TP port’s 10 Mbps link is inactive.
LFP: DIP switch is set to “LFP” mode
Device 1
TP LED
DUTA TP
LNK LED
DUTA FO
LED
DUTB FO
LED
DUTB TP
LNK LED
Device 2
TP LED
TP1
Faulted
OFF OFF OFF OFF OFF OFF
F1 Faulted
OFF
OFF
OFF
OFF
OFF
OFF
F2 Faulted
OFF
OFF
OFF
OFF
OFF
OFF
TP2
Faulted
OFF OFF OFF OFF OFF OFF
F1 F2
DUTA DUTB
TP1 TP2
Device1 Device2

- 10 -
LFP: DIP switch is set to “DIS” mode
Device 1
TP LED
DUTA TP
LNK LED
DUTA FO
LED
DUTB FO
LED
DUTB TP
LNK LED
Device 2
TP LED
TP1
Faulted
OFF OFF ON ON ON ON
F1 Faulted
ON
ON
OFF
OFF
ON
ON
F2 Faulted
ON
ON
OFF
OFF
ON
ON
TP2
Faulted
ON ON ON ON OFF OFF
Auto MDI/MDI-X Connection
The Auto MDI/MDI-X function allows users to connect the Moxa IMC’s
10/100BaseT(X) ports to any kind of Ethernet device, regardless of the
type of Ethernet cable used for the connection. This means that you can
use either a straight-through cable or crossover cable to connect the
IMC to Ethernet devices.
Dual Speed Functionality and Switching
The Moxa IMC’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 IMC are plug-and-play devices, so
that software configuration is not required during installation or
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.
Autonegotiation and Speed Sensing
The IMC-21A series’ RJ45 Ethernet port supports autonegotiation in
10BaseT and 100BaseT(X) modes, with operation governed by 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.
Autonegotiation takes place when an RJ45 cable connection is made;
each time a LINK is enabled. The Moxa IMC 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 advertise similarly. Depending
on which type of device is connected, the devices will agree to operate
at either 10 Mbps or 100 Mbps.
If a Moxa IMC’s 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.
F1 F2
DUTA DUTB
TP1 TP2
Device1 Device2