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CommFront offers
a range of high-quality, industrial-grade, port-powered
RS232 to RS485 converters. These plug-and-play
RS232 to RS485 converter / adapter 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
converter /
adapter 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 RS232 to RS485 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 RS485 ADAPTER 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
(Opto-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
(Opto-isolated/Industrial/Port-powered/300 to 57.6K Baud) |
$79.95
Order |
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INTRODUCTION (INDUSTRIAL RS232
TO RS485 CONVERTER)
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$54.95
Order Here |
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The CVT-485-1 is
an industrial grade (wide temperature range
with surge & static protection) port-powered bi-directional
RS232 to RS485
converter, which can be used to convert any standard RS-232C
port into a two-wire RS485 port and vice versa. The unit is
powered from the RS232 data line, it also supports data
direction auto-turnaround, and therefore, no external power
or flow control is required.
data sheet |
FAQs
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FEATURES (INDUSTRIAL RS232 TO
RS485 CONVERTER)
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- Converts RS232 to 2-wire RS485 and vice versa.
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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.
- Plug and play (hot-pluggable, data format auto-sensing &
self-adjusting).
- Data direction auto-turnaround, no flow control is required.
- Built-in
surge protection, static protection and circuit
protection.
- Built-in 120Ω end-of-line terminator for easy installation.
- Surface Mount Technology manufactured to ISO-9001 standards.
- CE certified.
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5-year
manufacturer's warranty. |
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SPECIFICATIONS (INDUSTRIAL
RS232 TO RS485 CONVERTER)
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Part Number: |
CVT-485-1 |
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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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Baud
Rates: |
300 to 115,200bps (Auto-sensing &
Self-adjusting) |
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Distance: |
Depending on power from RS232 port,
will transmit up to 4000ft (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: |
128 |
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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): |
0.63 x 1.3 x 3.4 in (16 x 32 x 86
mm) |
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Weight: |
1.27 oz (36 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-485-1 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, RS232
EXTENSION)
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Figure 1: Master-Slave
Multi-Drop Connections |
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Figure 2: Extending
Half-Duplex RS232 Distance (Data Only) |
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TROUBLESHOOTING INSTRUCTIONS
FOR 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-485-1 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-485-1 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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