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INTRODUCTION
(INDUSTRIAL RS232 ISOLATOR - 3
WIRE)
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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.
This industrial-grade RS232
opto-isolator operates within a
wide temperature range (-40ºF
to 185ºF / -40ºC to 85ºC),
and features 600W surge protection and 15kV static
protection.
The unit is powered from the RS-232 data line, and therefore,
no external power or RTS, DTR is required.
Product Comparison |
Declaration of Conformity
data sheet | 
FAQs
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product selection guide |
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$64.95 $49.95
In stock
Order Here
See
also: 7-wire RS232 Isolator
CVT-232B-3 |
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PRODUCT PHOTOS
(INDUSTRIAL RS232 OPTO-ISOLATOR - 3 WIRE) |
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Note:
We also provide custom-made product (male connector with screws and female
connector
with nuts) upon request, minimum quantity
of order:
10 units. |
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FEATURES (INDUSTRIAL RS232 OPTO
ISOLATOR)
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- Optically isolates three (3) RS-232 lines (TX, RX
and GND).
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Optical isolation effectively protects your RS-232 devices from
ground loops,
transient surges and spikes.
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Industrial grade with wide temperature range
(-40ºF
to 185ºF / -40ºC to 85ºC),
surge (600W)
and static protection (15kV).
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Port-powered, no external power or
RTS, DTR required.
- Plug and play (hot-pluggable, data format auto-sensing &
self-adjusting).
- Built-in
surge protection, static protection and circuit
protection.
- Surface Mount Technology manufactured to ISO-9001 standards.
- CE certified: strictly certified by
world-class lab TUV.
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5-year
manufacturer's warranty. |
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SPECIFICATIONS (INDUSTRIAL 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 (INDUSTRIAL 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 OPTO-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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