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CommFront offers
a range of high-quality, industrial-grade, port-powered
RS232 to RS422 converters. These plug-and-play
RS232 to RS422 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 RS422
converter / RS232 to RS422 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 RS422 converters and isolators provide
simple and effective ways to protect your devices from such
potential harms. |
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RS232 TO RS422 CONVERTER
/ RS232 TO RS422 ADAPTER SELECTION TABLE
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Part
Number |
Description |
Price |
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CVT-422-1 |
RS232 <=> 4-wire RS422
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-422-3 |
RS232 <=> 4-wire RS422
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 RS422 RS485 CONVERTER)
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$64.95
Order Here |
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The CVT-485_422-1 is
an industrial grade (wide temperature range
with surge & static protection) port-powered 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 RS485 port, or a four-wire
full-duplex RS485 / RS422 port and vice versa. The unit is powered
from the RS232 data line, it also supports data direction
auto-turnaround, therefore, no external power or flow
control is required.
data sheet | 
FAQs
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FEATURES (INDUSTRIAL RS232 TO
RS422 RS485 CONVERTER)
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- Converts RS232 to 2-wire RS485 or 4-wire RS485 / RS422 and vice
versa.
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Industrial grade with wide temperature range, surge
and static protection.
- 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.
- Built-in 120Ω end-of-line terminator
for easy installation.
- Surface Mount Technology manufactured to ISO-9001 standards.
- CE certified.
-
5-year
manufacturer's warranty. |
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SPECIFICATIONS (INDUSTRIAL RS232
TO RS422 RS485 CONVERTER)
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Part Number: |
CVT-485_422-1 |
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Compatibility: |
EIA/TIA
RS-232C standard and RS-485/RS-422 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/RS422 Side: DB-9 Male; Termination Board:
DB-9 Female and a 6-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 3.5 in (16 x 32 x 90 mm) |
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Weight: |
1.34 oz (38
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 / RS422 Side |
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Pin |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
4 |
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Jumper |
J2
(default: ON) |
J3
(default: ON) |
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J1
(default: ON) |
J4
(default: ON) |
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RS485 |
A+ (J2 ON) |
B- (J3 ON) |
GND |
(J1 ON) |
Terminate/remove Jumper J4
to turn ON/OFF the 120Ω
end-of-line terminator. |
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RS422 |
(J2 OFF) |
(J3 OFF) |
GND |
(J1 OFF) |
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TX+ |
RX+ |
TX- |
RX- |
GND |
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 Note:
The CVT-485_422-1 comes with a 6-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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JUMPER SETTINGS FOR RS485 /
RS422 MODES AND 120 OHM END-OF-LINE TERMINATOR
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1) RS232 to RS485 Mode |
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- Turn ON Jumper 1, 2 & 3 for RS-485 mode;
- IMPORTANT: Turn ON J4 (120 Ohm End-Of-Line
Terminator) at both ends of the RS-485 bus. |
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2) RS232 to RS422 Mode |
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- Turn OFF Jumper 1, 2 & 3 for
RS-422 mode;
- IMPORTANT: Turn ON J4 (120 Ohm End-Of-Line
Terminator) at both ends of the RS-422 (or 4-wire
RS-485) bus. |
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CONNECTIONS (RS485 BUS, RS422
BUS, RS232 EXTENSION)
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Figure 1: Master-Slave
Multi-Drop Connections (RS485) |
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Figure 2: Master-Slave
Multi-Drop Connections (RS422)
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Figure 3: Extending
Full-Duplex RS232 Distance (Data Only) |
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TROUBLESHOOTING INSTRUCTIONS
FOR RS232 TO RS422 / 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_422-1
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 a CVT-485_422-1 to your PC's COM port and remove
Jumper 1 and terminate Jumper 2 and 3 on the RS485/422
terminal block (as shown above).
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Run 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 the 232Analyzer software. You should
receive an echo of the command/string sent
("CommFront"). 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: Send/receive
commands from 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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