Moxa TCF-142-S-ST Installation Guide
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TCF-142 Series
Serial to Fiber-optic Converter
Quick Installation Guide
Ninth Edition, April 2008
1. Overview
Introduction
TCF-142 series (Rev. 3.1 or later) converters are equipped with a multiple
interface circuit that can handle RS-232, RS-422, and RS-485 serial
interfaces, as well as multi-mode or single-mode fiber. TCF-142
converters are used to extend serial transmission distance up to 5 km
(TCF-142-M, with multi-mode fiber) or up to 40 km (TCF-142-S, with
single-mode fiber). The TCF-142 must be configured to transmit a
particular serial interface. You cannot transmit both RS-232 and RS-485
signals at the same time.
Why Convert Serial to Fiber?
Fiber communication not only extends the communication distance, but
also provides many advantageous features.
IMMUNITY FROM ELECTRICAL INTERFERENCE: Fiber is not
affected by electromagnetic interference or radio frequency interference.
It provides a clean communication path and is immune to cross-talk.
INSULATION: Optical fiber is an insulator; the glass fiber eliminates the
need for using electric currents as the communication medium.
SECURITY: Fiber cannot be tapped by conventional electric means and
is very difficult to tap into optically.
RELIABILITY & MAINTENANCE: Fiber is immune to adverse
temperature and moisture conditions, does not corrode or lose its signal,
and is not affected by short circuits, power surges, or static electricity.
Reverse Power Protection
The Reverse Power Protection feature provides extra protection against
accidentally connecting the power cables to the wrong terminal. The
converter automatically detects which power wire is positive and which is
negative.
Ring Mode
To allow one half-duplex serial device to communicate with multiple
half-duplex devices connected to a fiber ring, you should configure the
TCF-142 for “ring mode” by setting DIP switch “SW4” to the “On”
position. The Tx port of a particular TCF-142 unit connects to the
neighboring converter’s Rx port on the ring. Note that when one
node transmits a signal, the signal
travels around the ring until it
returns back to the transmitting unit,
which then blocks the signal. Users
should ensure that the total fiber
ring length is less than 100 km
when using either single-mode
models (TCF-142-S) or multi-mode
models (TCF-142-M).
ATTENTION
For Fiber Ring Users:
To avoid problems when setting up a fiber ring, each TCF-142 unit
making up the ring must be powered down and set to “Ring mode.” Next,
make sure all cables are connected properly, and then power up all
devices connected to the ring. After
powering up the TCF-142 units, if
the Rx LEDs of the converters are ON continuously, power down and
then power up ONE of the TCF-142 units in the ring to return the
network to normal operation.
NOTE “Ring Mode” can only be used with half-duplex applications
(i.e., RS-485 multi-drop communication).
DIP Switch Selectable Terminator
The TCF-142’s termination resistor is set with a DIP switch located on
the outside of the converter’s casing.
No Configuration Required for Baudrate Settings
The TCF-142 is compatible with any baudrate from 300 bps to 921.6
Kbps. The TCF-142 automatically converts the signal back and forth
between serial (RS-232, RS-422, or RS-485) and fiber, and does not need
to interpret the signal or the baudrate of the transmitting device. For this
reason, the TCF-142 does not have any DIP switches or jumpers for
setting the baudrate.
2. Features
y “Ring” or “Point to Point” transmission
y Extend RS-232/422/485 transmission distance:
> up to 40 km with single-mode—TCF-142-S Series
> up to 5 km with multi-mode—TCF-142-M Series
y Compact size
y Decrease signal interference
y Protect against electronic degradation and chemical corrosion
y Supports baudrates up to 921.6 Kbps
y Extended operating temperature from -40 to 75°C (for “T” models)
3. Package Checklist
Before installing the TCF-142, verify that the package contains the
following items:
y TCF-142 Fiber Converter
y Quick Installation Guide
y 7-contact terminal block connector
y 3-contact terminal block connector
NOTE: Please notify your sales representative if any of the above items
are missing or damaged.
4. Dimensions and Appearance
TCF-142 fiber converters are easy to set up and use. The serial terminal
block of one of the converters connects to your computer, the serial
terminal block of the other converter connects to your serial device, and
the two converters are connected by fiber cable(s).
NOTE
Electrostatic Discharge Warning!
To protect the product from damage due to electrostatic
discharge, we recommend wearing a grounding device when
handling your TCF-142.
TCF-142-M/S-ST TCF-142-M/S-SC
)ni 59.3( mm
4
.00
1
22.0 mm
(0.87 in)
21.3 mm
(0.8 in)
42.3 mm (1.67 in)
67 mm (2.64 in)
78 mm (3.07 in)
12.5 mm
(0.49 in)
)
ni 89.0( mm 52
O 6 mm
(0.24 in)
O 4 mm
(0.16 in)
O 7 mm
(0.28 in)
ON
123
4
67 mm (2.64 in)
78 mm (3.07 in)
12.5 mm
(0.49 in)
)ni 89.0( mm 52
O 6 mm
(0.24 in)
O 4 mm
(0.16 in)
O 7 mm
(0.28 in)
90.2 mm
(3.55 in)
67 mm
(2.64 in)
22.0 mm
(0.87 in)
ON
123
4
5. Wiring Examples
Connecting the Power Supply
Before using the TCF-142, first connect the DC power supply to the
power supply terminal block located on the TCF-142’s bottom panel.
DC
Power
Supply
RS-422/485
Rx
Tx
V -
V -
V+
V+
GND GND
TCF-142
P/N: 1802001420618
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Summary of Contents
Page 1 - Quick Installation Guide
— 1 — — 2 — — 3 — 232-SR232-SR584-SR224-SR241-FCT241-FCT241-FCTxTxTxTxTxRxRxRxR241-FCT0125S-241-FCTwsxTxRRWPxTrebiFxR rebiFretrevnoC rebiF ot lai
Page 2 - RS-422/485
— 4 — — 5 — — 6 — Connecting RS-422 and 4-wire RS-485 Serial Devices PCRS-422/485RxTx RxTxRS-422/485Tx-Tx+Rx-Rx+GNDR-R+T-T+GNDTCF-142TCF-142Serial
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