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CommFront offers
a range of high-quality, industrial-grade, port-powered
RS232 Isolators and opto-isolated RS232 to RS485 / RS422
converters. These plug-and-play RS232 Isolator
and isolated converter products operate within a
wide temperature range (-40ºF
to 185ºF / -40ºC to 85ºC),
feature 600W surge protection and 15kV static protection,
and come with built-in 120 Ohm terminators for easy
installation. Whether your environment is commercial or
industrial, "clean" or "noisy"*, our isolator and converter
products provide safe, easy, and cost-effective solutions
for your data-conversion applications.
* A "noisy" environment
is an area
surrounded by ground loops, transient surges
and spikes, which could potentially harm your expensive
equipment such as computers and data communication
devices.
The CommFront Opto-Isolated Converters and RS232 Isolators provide
simple and effective ways to protect your devices from such
potential harms. |
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RS232 OPTO-ISOLATOR / CONVERTER
SELECTION TABLE
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Part
Number |
Description |
Price |
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CVT-485-3 |
RS232 <=> 2-wire RS485
Converter
(Isolated/Industrial/Port-powered/300 to 57.6K Baud) |
$74.95
Order |
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CVT-422-3 |
RS232 <=> 4-wire
RS422 Converter
(Isolated/Industrial/Port-powered/300 to 57.6K Baud) |
$74.95
Order |
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CVT-485_422-3 |
RS232 <=> 2-wire RS485 or
4-wire RS422 Converter
(Isolated/Industrial/Port-powered/300 to 57.6K Baud) |
$79.95
Order |
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CVT-232A-3 |
RS232
Opto-Isolator
(3-wire/Isolated/Industrial/Port-powered/300 to 38.4K
Baud) |
$49.95
Order |
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CVT-232B-3 |
RS232 Opto-Isolator
(7-wire/Isolated/Industrial/Port-powered/300 to 19.2K
Baud) |
$59.95
Order |
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INTRODUCTION (RS232 ISOLATOR - 3
WIRE)
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$64.95 $49.95
Order Here |
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The CVT-232A-3
is an
industrial grade (wide temperature range with surge & static
protection) 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 and spikes.
Optical isolation also
eliminates ground loop and noise problems.
The unit is powered from the RS-232 data line, and therefore,
no external power or RTS, DTR is required.
data sheet |
FAQs |
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FEATURES (RS232 ISOLATOR - 3
WIRE)
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Provides opto
isolation between two (2) RS-232 devices. |
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Industrial
grade with wide temperature range, surge and static protection. |
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Port-powered, no external power or RTS, DTR required. |
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Optical isolation effectively protects your RS-232 devices from
ground loops,
transient surges and spikes. |
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Optical isolation eliminates ground loop and noise problems. |
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Plug
and play (hot-pluggable, data format auto-sensing and
self-adjusting). |
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Built-in
surge protection, static protection and circuit protection. |
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Surface Mount
Technology manufactured to ISO-9001 standards. |
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CE
certified. |
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5-year
manufacturer's warranty. |
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SPECIFICATIONS (RS232 ISOLATOR -
3 WIRE)
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Part Number: |
CVT-232A-3 |
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Compatibility: |
EIA/TIA
RS-232C standard |
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Power Source: |
Port power
from RS232 data line |
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Current
Consumption: |
Less than
10mA |
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Optical
Isolation: |
2500Vrms
(AC, 1 min) |
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Baud
Rates: |
300
to 38,400bps (auto-sensing & self-adjusting) |
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Distance: |
RS-232: 16ft
(5m) |
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Connector: |
DB-9 Female
Connector and DB-9 Male Connector |
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Surge protection: |
600W |
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Static
protection (ESD): |
Up to 15KV |
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Dimensions (H
x W x D): |
0.63 x 1.3
x 2.5 in (16 x 32 x 63 mm) |
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Weight: |
0.83 oz
(23.5 g) |
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Operating
Temperature: |
-40ºF to
185ºF (-40ºC to 85ºC) |
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Operating
Humidity: |
Up to 90%
RH (no condensation) |
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ISOLATOR CONNECTOR PINOUTS
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Female RS232 Side |
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Pin |
1 |
4 |
6 |
7 |
8 |
2 |
3 |
5 |
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Signal |
DCD |
DSR |
DTR |
CTS |
RTS |
TX |
RX |
GND |
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Function |
Tied |
Tied |
TX |
RX |
GND |
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 Note:
Some software requires handshake line
acknowledgements. To satisfy the requirements, our
converter's handshake lines are tied together (DCD,
DTR, and DSR tied together, and RTS and CTS tied
together). Therefore, you don't have to modify your
existing software. |
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DB-9
Female (view from front) |
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Male RS232 Side |
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Pin |
1 |
4 |
6 |
7 |
8 |
2 |
3 |
5 |
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Signal |
DCD |
DTR |
DSR |
RTS |
CTS |
RX |
TX |
GND |
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Function |
Tied |
Tied |
RX |
TX |
GND |
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 Note:
Some software require handshake line
acknowledgements, to satisfy the requirements, this
3-wire RS232 Isolator's handshake lines are tied
together (DCD, DTR, DSR tied together, and RTS, CTS
tied together), therefore, you don't have to modify
your existing software. |
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DB-9 Male (view from front) |
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CONNECTIONS (RS232 ISOLATOR - 3
WIRE)
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FIGURE 1:
CVT-232A-3 CONNECTION DIAGRAM (DTE TO DCE) |
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FIGURE 2:
CVT-232A-3 CONNECTION DIAGRAM (DTE TO DTE) |
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TROUBLESHOOTING INSTRUCTIONS
FOR 3-WIRE RS232 ISOLATOR
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1) Port power measurement |
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Note: The port-powered
3-wire RS232 Isolator requires a -7 to -15VDC on the TX line
(Pin 3 on DTE or Pin 2 on DCE) of the RS232 ports to which
the isolator is connected.
Connect the female connector
end of the isolator to a DTE device such as a PC, connect
the other end (male connector) of the isolator to a DCE
device such as a modem. |
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2) Loopback Test |
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- Connect the female
connector end of the isolator to your PC’s COM port and
connect the other end (male connector) to another of
your PC’s COM ports with a null-modem converter (or
connect pin 2 to 3, pin 3 to 2, and pin 5 to 5 between
the male connector and your PC's RS232 connector) (as
shown above).
- Run two instances
of the
232Analyzer FREE
version software on your computer.
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Select "ASCII" for both the Send and Receive data
formats. Then send command and/or string such as
"CommFront" from one COM port. You should receive an
echo of the command/string sent ("CommFront") on the
other COM port. By performing a simple loopback test
like this, you can test both the transmitter and
receiver of the isolator. This is very helpful when you
are in doubt about the performance of your isolator.
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Screenshot 1: Send commands
from 1st instance of the 232Analyzer software.
Screenshot 2: Receive commands
from 2nd instance of the 232Analyzer software.
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232Analyzer is an advanced RS232 Serial Protocol Analyzer
software
that allows you to control, monitor and analyze serial port
(RS232 / RS485 / RS422 / TTL, etc.) activities.
Not just the data,
it also allows you to monitor or change RS-232's line
states: RTS, CTS, DTR, DSR, DCD, and RI.
The FREE version (no time
limitation) can be downloaded from
here.
TECH NOTES
RS-232: 3 easy steps to understand and control
your RS232 devices |
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