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Featured Products |
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OPTO-ISOLATED
RS232 ISOLATORS USB
RS232 RS485 RS422
CONVERTERS
HUBS
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RS232 to RS485 Converters |
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RS232 to RS422 Converters |
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RS232 RS485
RS422 to TTL Converters |
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RS232 Isolators / Isolated Converters |
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RS232 RS485 RS422 Repeaters |
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Fiber Optic Converters |
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USB Serial Adapters |
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RS232 Serial
Analyzer |
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FREE
Worldwide Shipping |
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(Same-Day Shipping) |
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Within USA
(Ship
from Maryland) |
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USPS Priority:
FREE |
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Customer FedEx/UPS/DHL
acc#: FREE |
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2Day: From $8 |
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Overnight: From $12 |
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(Guaranteed FedEx: Close at 5:30pm EST) |
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International |
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Registered Airmail:
FREE |
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Customer FedEx/UPS/DHL
acc#: FREE |
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FREE Express:
Orders >$150 |
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Legend |
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-1: Port-powered
-2: Externally-powered
-3: Port-powered/Isolated
-4: Externally-powered
/Isolated
Examples:
CVT-232A-3 (Port-powered /Opto-isolated)
CVT-485_422-4 (Externally-powered/Opto-isolated) |
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Testimonials |
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"I am communicating with kWh
(energy) meters that have the RS485 built in, the
port-powered converter's auto-turnaround feature works
really well for my application, and I don't have to
change any configuration."
- Peter |
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"Your isolators
have been working reliably for years without a
single failure or trouble, we are satisfied with the
products."
- David
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Industrial
Opto-Isolated Serial Converters
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CommFront offers
a range of
rugged, industrial-grade, port or externally-powered RS232 isolators and opto-isolated
USB / RS232 / RS485 / RS422 Converters and Hubs. These industry-proven, opto-isolated serial converter products
are designed to
interface with mission-critical equipment, such as
computers, PLC, SCADA and HMI. Whether your environment is
in the field, server room, factory, control room, or fire
command center, "clean" or "noisy",
these popular opto isolated converter products provide
safe, reliable, simple, and cost-effective solutions for
your data-conversion and device-protection applications. We
back our
high-quality products with a 30-day risk-free money-back
guarantee and a 5-year replacement warranty.
* A "noisy" environment
is an area
surrounded by ground loops, transient surges,
remote lightning and spikes, which could potentially harm your expensive
equipment such as computers and data communication
devices.
The CommFront opto-isolated converters and isolators provide
simple and effective ways to protect your devices from such
potential harms.
Feature Highlights |
[+]
Cost-effective
industrial-grade
CommFront
offers
a range of cost-effective industrial-grade RS232 isolators and
opto-isolated USB / RS232 / RS485 / RS422 Converters and Hubs, which are suitable not just for industrial but also
commercial applications.
Why industrial-grade?
Just as there are many differences between industrial- and
commercial-grade computers, industrial- and commercial-grade
opto-isolated converters differ in many ways, such as the level of
circuit protection, temperature range and noise tolerance. Most
importantly, true industrial-grade converters, such as CommFront's, require rugged
components and reliability-engineering designs to withstand heat,
vibration, shock and other environmental factors, therefore, they
are much more durable than commercial-grade converters.
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[+]
Hassle-free auto-turnaround feature
CommFront's RS485
converters come with the auto-turnaround feature. Upon sensing a
"start bit" (a logic high "Mark" to low "Space" transition) from its
RS232 data transmit line (TxD), the RS485 transceiver circuit will
automatically change the data direction so that the RS485 side is in "listening" mode, thus reducing the chance of data
collusion. The auto-turnaround feature eliminates the need of using flow
control and/or software drivers; therefore, it is very useful for
half-duplex RS485 communications.
Note: Auto-turnaround feature is not applicable to full-duplex communications such as RS232, RS422,
and TTL, because full-duplex communications consist of two channels:
TX (Transmitting) and RX (Receiving), and both channels can operate
simultaneously.
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[+]
Plug-and-play with full circuit protection
CommFront's
RS232 isolators and opto-isolated USB/RS232/RS485/RS422 converter products come with the
auto-sensing and self-adjusting features, which automatically adjust
baud rate, parity, stop bit and other COM port parameters to the
devices that they are connected to.
The converters are hot-pluggable and are equipped with 600W surge
protection, 15kV ESD protection, and additional circuit protection,
thus making the devices highly reliable and truly plug-and-play.
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ALL-IN-ONE rugged terminal block with
selectable 120-Ohm and 5VDC input
Most of our opto-isolated converters
come with an ALL-IN-ONE rugged terminal block professionally
designed for different requirements, such as the selectable 120-Ohm
terminator jumper, which is important for reducing noise and
reflections when the RS485/RS422's distance exceeds 660ft (200m) or
when the baud rate is above 19.2kbps; the external 5VDC input for
compact RS485/RS422 converters; and the TX, RX, and GND inputs for shielded twisted-pair
cables such as CAT-5e cables.
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[+]
SGS/TUV
strictly-certified
superior-quality products
CommFront's opto-isolated converter and
isolator products are strictly certified by SGS
and/or TUV - the world's leading inspection, testing, and
certification companies. Both SGS and TUV are Nationally Recognized Testing Laboratories (NRTLs) in North
America (approved by the Occupational Safety & Health
Administration [OSHA]) and Notified Bodies in the European Union.
Why SGS/TUV? The market
includes many certifying laboratories. From small-scale to
large-scale and non-reputable to reputable, every certifying
laboratory serves its own customer base. As part of our commitment
to providing superior-quality, safe, and reliable products, we
have selected SGS/TUV as our certifying partners. SGS and TUV conduct the most meticulous and thorough tests
required for safety certifications. Typical testing and certifying times
at SGS/TUV range from 3 to 6
months, compared to 3 days for some
other laboratories, such as SEM Test Compliance.
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3-Wire Industrial RS232
Isolator
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$35.95
Order Here
Instant
Discounts
Qty: 10+ $32.36
Qty: 50+ $30.56
Other Qty:
Ask |
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The CVT-232A-3 is
a compact, rugged, industrial-grade, port-powered RS-232 isolator. The unit
optically
isolates three (3) RS-232 lines (TX, RX and GND), which
effectively protects your RS-232 devices from
ground
loops, transient surges, remote lightning and spikes.
Optical isolation also
eliminates ground loop and noise problems.
The unit is powered from the
RS-232 data line (self-powered), and therefore, no external
power, software drivers or RTS, DTR is required.
more info |
datasheet |
FAQs
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product selection guide
 testing
info |
 declaration
of conformity
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7-Wire Industrial RS232
Isolator
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$59.95
Order Here
Instant
Discounts
Qty: 10+ $53.96
Qty: 50+ $50.96
Other Qty:
Ask
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The CVT-232B-3 is
a compact, rugged,
industrial-grade,
port-powered RS-232 isolator. The unit e unit
optically
isolates seven (7) RS-232 lines (TX,
RX, RTS, CTS, DTR, DSR and GND),
which effectively protects your RS-232 devices from
ground
loops, transient surges, remote lightning and spikes.
Optical isolation also
eliminates ground loop and noise problems.
The unit is powered from the RS-232 data line
(self-powered), and therefore, no external power, software
drivers or RTS, DTR
is required.
more info |
datasheet |
FAQs
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product selection guide
testing
info |
declaration
of conformity
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Opto-Isolated RS232 Repeater |
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$27.95
Order Here
Volume Discounts
Qty: 10+ $25.16
Qty: 50+ $23.76
Other Qty:
Ask
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The RPT-232-3 is
a compact,
rugged, industrial-grade,
optically-isolated, port-powered RS232 data repeater (TX, RX,
and GND), which works in pairs to extend the full-duplex
RS-232 distance up to 1.8 miles (3 km). This product
features opto-isolation circuitry, which effectively protect
your RS-232 devices from
ground
loops, transient surges, remote lightning and spikes.
Therefore, it provides an ideal solution for extending,
protecting and isolating RS232 devices that are connected
together and surrounded by
ground loops, transient surges, remote
lightning and spikes.
The unit is powered from the
RS-232 data line, no external power, software
drivers or RTS,
DTR is required.
Baud
rates: 300 to 28.8K Baud.
more info |
datasheet |
FAQs
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product selection guide
testing
info |
declaration
of conformity
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Opto-Isolated
RS232 to RS485 Converter
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$64.95
Order Here
Instant
Discounts
Qty: 10+ $58.46
Qty: 50+ $55.21
Other Qty:
Ask |
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The CVT-485-3 is
a compact,
rugged, industrial-grade, optically-isolated, port-powered, bi-directional
RS-232 to RS-485 converter, which can be used to convert any
standard RS-232C port into a two-wire balanced half-duplex RS-485
port and vice versa.
This product features
opto-isolation circuitry, which effectively protect your
RS-232 devices from
ground
loops, transient surges, remote lightning and spikes.
The unit is powered from the
RS-232 data line (self-powered); it also supports data
direction auto-turnaround. Therefore, no external power,
software drivers or
flow control is required.
The unit also comes with
a built-in 120 Ohm terminator for system reliability
and easy
installation.
more
info |
datasheet |
FAQs
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product selection guide
testing
info |
declaration
of conformity
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Opto-Isolated
RS232 to RS422 Converter
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$64.95
Order Here
Instant
Discounts
Qty: 10+ $58.46
Qty: 50+ $55.21
Other Qty:
Ask |
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The CVT-422-3 is
a compact,
rugged, industrial-grade, optically-isolated, port-powered, bi-directional
RS232 to RS422 converter, which can be used to convert any
standard RS-232C port into a four-wire balanced full-duplex RS-422
port and vice versa.
This product features
opto-isolation circuitry, which effectively protect your
RS-232 devices from
ground
loops, transient surges, remote lightning and spikes.
The unit is powered from the
RS-232 data line (self-powered); it also supports data
direction auto-turnaround. Therefore, no external power,
software drivers or
flow control is required.
The unit also comes with
a built-in 120 Ohm terminator for system reliability
and easy
installation.
more info
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datasheet |
FAQs
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product selection guide
testing
info |
declaration
of conformity
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Opto-Isolated
RS232 to RS422 / RS485 Converter
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$69.95
Order Here
Instant
Discounts
Qty: 10+ $62.96
Qty: 50+ $59.46
Other Qty:
Ask |
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The CVT-485_422-3 is
a compact,
rugged, industrial-grade, optically-isolated, bi-directional
RS232 to RS485 converter / RS232 to RS422 converter, which can be
used to convert any standard RS-232C port into a two-wire
half-duplex RS-485 port or a four-wire balanced full-duplex RS-422
port and vice versa.
This product features
opto-isolation circuitry, which effectively protect your
RS-232 devices from
ground
loops, transient surges, remote lightning and spikes.
The unit is powered from the
RS-232 data line (self-powered); it also supports data
direction auto-turnaround. Therefore, no external power,
software drivers or
flow control is required.
The unit also comes with
a built-in 120 Ohm terminator for system reliability
and easy
installation.
more info |
datasheet |
FAQs
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product selection guide
testing
info |
declaration
of conformity
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25-pin
Opto-Isolated RS232 to RS422 / RS485 Converter
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Model:
CVT-485_422-3(25)
$69.95
Order Here
Instant
Discounts
Qty: 10+ $62.96
Qty: 50+ $59.46
Other Qty:
Ask |
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The CVT-485_422-3(25) is
a 25-pin
version, compact, rugged, industrial-grade,
optically-isolated,
port-powered, bi-directional
RS-232 to RS-485 converter / RS-232 to
RS-422 converter, which can be used to convert any standard
25-pin RS-232C port into a two-wire balanced half-duplex RS-485 port or a
four-wire balanced full-duplex RS-422 port and vice versa.
This product features
opto-isolation circuitry, which effectively protect your
RS-232 devices from
ground
loops, transient surges, remote lightning and spikes.
The unit is powered from the
RS-232 data line; it also supports data direction
auto-turnaround, therefore, no external power, software
drivers or flow
control is required.
The unit also comes with
a built-in 120 Ohm terminator for system reliability
and easy
installation.
more info |
datasheet |
FAQs
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product selection guide
testing
info |
declaration
of conformity
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Opto-Isolated
RS232 to RS422 / RS485 Converter (Externally-powered)
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Model: CVT-485_422-4
$97.95
Order Here
Instant
Discounts
Qty: 10+ $88.16
Qty: 50+ $83.26
Other Qty:
Ask |
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The CVT-485_422-4 is
a rugged,
industrial-grade, high-speed (300 to 115,200bps), optically-isolated,
externally-powered, bi-directional
RS-232 to RS-485 converter / RS-232 to
RS-422 converter, which can be used to convert any standard
RS-232C port into a two-wire balanced half-duplex RS-485 port or a
four-wire half-duplex RS-485 / full-duplex RS-422 port and vice versa. This
product features opto-isolation circuitry, which effectively
protect your RS-232 devices from
ground
loops, transient surges, remote lightning and spikes;
it also supports data direction
auto-turnaround. Therefore, no software drivers or flow
control is required.
The unit also comes with
a built-in 120 Ohm terminator for system reliability
and easy
installation. The unit is powered from an
external 9 to 30VDC power supply, so you do not have to
worry about the power capability of your RS232 device.
more info
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datasheet |
FAQs
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product selection guide
testing
info |
declaration
of conformity
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Opto-Isolated
RS485 RS422 Repeater / Converter (Externally-powered)
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Model: RPT-485_422-4
$119.95
Order Here
Instant
Discounts
Qty: 10+ $107.96
Qty: 50+ $101.96
Other Qty:
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The
RPT-485_422-4 is a rugged, industrial-grade, optically-isolated
RS-485/RS-422 repeater/converter, which can be used to
extend the RS-485 or RS-422 distance to up to 4000 ft
(1.2km), it can also can be used to convert a two-wire
RS-485 signal into a four-wire RS-422 signal, and vice
versa.
This product features opto-isolation
circuitry, which effectively protects your RS-485/RS-422
devices from transient surges, ground loop, remote lightning and
spikes. The
unit supports serial data rates up to 115,200bps and
features data format auto-sensing and self-adjusting, and,
therefore, no DIP switch or jumpers are required. When
working with RS-485 signals, the CommFront’s auto-turnaround
feature eliminates the need for software drivers and flow control.
more info
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datasheet |
FAQs
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product selection guide
testing
info |
declaration
of conformity
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Opto-Isolated
RS485 Hub (Externally-powered)
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Model:
HUB-485-4
$149.95
Order Here
Instant
Discounts
Qty: 10+ $134.96
Qty: 50+ $127.46
Other Qty:
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The HUB-485-4 is a rugged,
industrial-grade,
optically-isolated RS-485
Hub, which can be used to expand RS-485
networks by splitting one RS-485 network into four, in turn
increasing the maximum number of nodes and the distance
covered by an RS-485 network.
The product features opto-isolation circuitry, which
effectively protects your RS-232/RS-485 devices from
transient surges, ground loops, remote lightning and spikes. Opto-isolation
also eliminates ground loop and noise problems. The unit
supports data rates up to 115,200 bps and features data
format auto-sensing and self-adjusting; therefore, no DIP
switch or jumpers are required.
more info
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datasheet |
FAQs
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product selection guide
testing
info |
declaration
of conformity
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Opto-Isolated
USB to RS232 / RS485 / RS422 Converter (Port-powered)
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Model: USB-Serial-3
$119.95
Order Here
Instant
Discounts
Qty: 10+ $107.96
Qty: 50+ $101.96
Other Qty:
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The
USB-Serial-3 is a rugged, industrial-grade,
optically-isolated USB
to RS-232/485/422 converter, which can be used to convert
any standard USB port into a three-wire RS-232 port, a
two-wire RS485 port, or a four-wire RS422/RS485 port and
vice versa.
This
product features opto-isolation circuitry, which effectively
protects your USB devices from transient surges, ground
loops, remote lightning and spikes.
The unit also comes with
a built-in 120 Ohm terminator for system reliability
and easy
installation.
The unit uses the latest chipset from Silicon Labs and is
fully compatible with Windows 7/Vista/XP/Server2003/2000
(32-bit), Windows 7/Vista (64-bit), Win CE (5.0, 6.0), Mac
OSX, and Linux (2.6x, 2.4.36).
more info
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datasheet |
FAQs |
product selection guide
testing
info |
declaration
of conformity
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