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CommFront offers
a range of high-quality, industrial-grade, port-powered
RS232 to RS485 converters. These plug-and-play
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 RS232 to RS485
/ RS422
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 isolators provide
simple and effective ways to protect your devices from such
potential harms. |
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RS232 TO RS485 CONVERTER /
RS232 TO RS422 CONVERTER
SELECTION TABLE
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Part
Number |
Description |
Price |
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CVT-485-1 |
RS232 <=> 2-wire RS485
Converter
(Industrial/Port-powered/300 to 115.2K Baud) |
$47.95
Order |
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CVT-485_422-1 |
RS232 <=> 2-wire RS485 or
4-wire RS422 Converter
(Industrial/Port-powered/300 to 115.2K Baud) |
$54.95
Order |
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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-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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INTRODUCTION (ISOLATED RS232 TO
RS485 CONVERTER)
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The CVT-485-3 is
an
industrial grade (wide temperature range with surge & static
protection) optically isolated bi-directional
RS-232 to RS-485 converter,
which can be used to convert any standard RS-232C port into
a two-wire 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 and spikes.
The unit is powered from the
RS-232 data line; it also supports data direction
auto-turnaround. Therefore, no external power or flow
control is required.
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$84.95 $74.95
Order Here
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data sheet |
FAQs |
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FEATURES (ISOLATED RS232 TO
RS485 CONVERTER)
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Converts RS232 to
RS485 (with opto-isolation) and vice versa. |
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Industrial
grade with wide temperature range, surge and static protection. |
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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 &
self-adjusting). |
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Port-powered, no external power or RTS, DTR required. |
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Data direction auto-turnaround, no flow control is required. |
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Built-in
surge
protection, static protection and circuit protection. |
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Built-in 120Ω end-of-line terminator for easy
installation. |
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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 (ISOLATED RS232
TO RS485 CONVERTER)
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Part Number: |
CVT-485-3 |
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Compatibility: |
EIA/TIA
RS-232C standard and RS-485 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: |
1,200
to 57,600bps (auto-sensing & self-adjusting) |
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Distance: |
RS-232 side:
16 ft (5m); RS-485 side: Depending on power from RS232 port,
will transmit up to 4000 ft (1.2km) at 19,200bps |
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Connector: |
RS232 Side:
DB-9 Female; RS485 Side: DB-9 Male; Termination Board: DB-9
Female and a 4-Way Terminal Block |
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Maximum number
of drops: |
64 |
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End of Line
Terminator: |
120Ω
(Built-in) |
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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): |
0.6 x 1.3 x
3.5 in (16 x 32 x 88 mm) |
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Weight: |
1.36 oz (39
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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CONVERTER CONNECTOR / TERMINAL
BLOCK PINOUTS
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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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RS485 Side |
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Pin |
1 |
3 |
5 |
9 |
6 |
7 |
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Terminal Block |
A+ |
B- |
GND |
+5V |
Jumper (120) |
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Function |
RS485+ |
RS485- |
GND |
+5V
measurement |
Terminate/remove Jumper 120
to turn ON/OFF the 120Ω end-of-line
terminator. |
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 Note:
The CVT-485-3 comes with a 4-way terminal block for easy
wire connections. However, you may choose not to use the
terminal block provided and simply follow the above table
for pin assignments. |
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DB-9 Male (view from front) /
Terminal Block |
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120 OHM END-OF-LINE JUMPER
SETTINGS
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IMPORTANT:
Turn ON Jumper 120 (120 Ohm End-Of-Line Terminator)
at both ends of the RS-485 bus. |
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CONNECTIONS (RS485 BUS)
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Figure 1: Master-Slave
Multi-Drop Connections |
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TROUBLESHOOTING INSTRUCTIONS
FOR ISOLATED RS232 TO RS485 CONVERTER
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1) Port power measurement |
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Measure pin
+5V and GND with a voltmeter, and be sure that it is around
+5VDC (when RS232 port is connected). Otherwise, please
check the power on the RS232 port to which the converter is
connected (as shown below). |
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Note: CommFront
port-powered converters require a -7 to -15VDC on the TX
line (Pin 3 on DTE or Pin 2 on DCE) of the RS232 port to
which the converter is connected.
You can connect CVT-485-3 to a
DTE device which comes with a DB-9 Male connector; however,
if it is a DCE device, you will need to swap Pin 2 and 3
before connecting to the converter. |
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2) Loopback Test |
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Connect two numbers of CVT-485-3 to your PC’s COM ports
and connect A+ to A+, B- to B- on the RS485 terminal
blocks
(as shown above).
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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 converter. This is very helpful when you
are in doubt about the performance of your converter.
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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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