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Industrial Port-Powered
Isolated RS232 to RS422 Converter |
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Model:
CVT-422-3
$64.95
In stock
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The CVT-422-3 is
a compact,
rugged,
industrial-grade, optically-isolated, port-powered, bi-directional
RS-232 to RS-422 converter,
which can be used to convert any standard unbalanced RS232C port into
a four-wire full-duplex balanced
RS485 / RS422 port and vice versa.
This
industrial opto-isolated RS232 to RS422 converter
operates within a
temperature range of -40ºF to 185ºF (-40ºC to 85ºC),
features 600W surge protection and 15kV static protection,
and comes with
a built-in 120-Ohm terminator for
system reliability and easy
installation.
It also features opto-isolation circuitry, which effectively
protect your RS-232 devices from
ground
loops, noise problems, transient surges, remote lightning and spikes.
The unit is efficiently powered from the RS232 data line,
it requires no external power, software drivers
or flow control, making the unit a highly reliable and truly plug-and-play device.
The built-in 120-Ohm
terminator can be turned ON or OFF through a simple jumper
setting, thus making the unit an ideal solution for all
types of installations.
The unit is backed by our 30-day risk-free money-back
guarantee and 5-year replacement warranty.
Baud rates: 300 to 38.4K
Baud.
datasheet |  FAQs |
product selection guide
 rs485/rs422 application note
 testing
info |
 declaration
of conformity |
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PRODUCT PHOTOS
(ISOLATED RS232 TO RS422 CONVERTER) |
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FEATURES (INDUSTRIAL RS232 TO
RS485 CONVERTER)
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- Converts RS232 to 4-wire RS422 and vice versa.
- 300 to 38.4K Baud operation (auto-sensing &
self-adjusting).
- Built-in 120Ω end-of-line terminator for system reliability
and easy installation.
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Industrial grade with temperature range of -40ºF to 185ºF (-40ºC to 85ºC),
surge
(600W) and static protection (15kV).
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Optical isolation effectively protects your RS-232 devices from
ground loops,
transient surges, remote lightning and spikes.
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Port-powered, no external power or
RTS, DTR required.
- Accepts external 5VDC regulated power if the port-power is
insufficient.
- Plug and play (hot-pluggable, data format auto-sensing &
self-adjusting).
- Data direction auto-turnaround, no flow control is required.
- No drivers needed.
- Built-in
surge protection, static protection and circuit
protection.
- Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
- Safety: Strictly certified by TUV (Cert No. SG-CE-090012).
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5-year
manufacturer's warranty. |
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SPECIFICATIONS (ISOLATED RS232
TO RS422 CONVERTER) |
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Part Number: |
CVT-422-3 |
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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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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 side:
16 ft (5m); RS-422 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; RS422 Side: DB-9 Male; Termination Board: DB-9
Female and a 6-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): |
0.63 x 1.3
x 3.5 in (16 x 32 x 90 mm) |
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Weight: |
1.4 oz (40 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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RS422 Side |
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DB9 Pin |
1 |
2 |
3 |
4 |
5 |
9 |
8 |
4 |
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Terminal Block
/ Function |
TX+ |
RX+ |
TX- |
RX- |
GND |
+5V
measurement |
Terminate/remove J4 to
turn ON/OFF the 120Ω
end-of-line terminator. |
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 Note:
The CVT-422-3 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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120 OHM END-OF-LINE JUMPER
SETTINGS |
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Important: Turn ON J4
(120 Ohm End-Of-Line Terminator) at both ends of the
RS-422 bus when the data rate is over 19.2kbps or the distance is over 660ft (200m). |
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CONNECTIONS (RS422 BUS, RS232
EXTENSION WITH OPTO-ISOLATION) |
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Figure 1: Master-Slave
Multi-Drop Connections (RS422) |
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Figure 2: Extending
Full-Duplex RS232 Distance (with opto-isolation) |
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[+] TROUBLESHOOTING RS232 TO RS422
ISOLATED CONVERTER
1) Port power measurement
Measure pin
+5V and GND with a voltmeter, and be sure that it is around
+5VDC (when RS232 port is connected).
2) Loopback Test
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Connect a CVT-422-3 to your PC's COM port and short TX
and RX (TX+ to RX+, TX- to RX-) on the RS422 terminal
block (as shown above).
- 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.
Screenshot: Send/receive
commands from 232Analyzer software.
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
RS-485/RS422:
Building a reliable RS485/RS422 network |
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