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Externally-Powered Isolated RS232
to RS485 RS422 Converter
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Model:
CVT-485_422-4
$97.95
In stock
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The CVT-485_422-4 is
a rugged,
industrial-grade, high-speed (300 to 115,200bps), optically-isolated,
externally-powered
RS232 to RS485 converter /
RS232 to RS422 converter, which can be used to convert any
standard RS232C port into a two-wire half-duplex RS485 port or a
four-wire full-duplex RS485/RS422 port and vice versa.
This
industrial externally-powered opto-isolated RS232 to RS485 / RS422 converter
operates within a temperature range of -40ºF
to 185ºF (-40ºC to 85ºC)
and
features 600W surge protection and 15kV ESD static protection.
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
powered from an external 9 to 30VDC power supply, so you do
not have to worry about the power ability of your RS232
device; it also supports data
direction auto-turnaround, which automatically enables the
RS485 transceiver when data is present on the RS232 side.
Therefore, it requires no port 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
wire, thus making the unit an ideal solution for all types
of installations.
A separate
external power supply is included in the package, and,
thanks to the professional and unique casing design, the
product can be mounted directly on a wall, panel or DIN Rail,
without a need of using any unsecured DIN-Rail or wall-mount adapters.
This device
is backed by our 30-day risk-free money-back guarantee and
5-year replacement warranty.
Baud
rates: 300 to 115.2K Baud.
datasheet | 
FAQs
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product selection guide
 rs485/rs422 application note
 testing
info |
 declaration
of conformity
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PRODUCT PHOTOS
(ISOLATED RS232 TO RS485 RS422 CONVERTER)
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FEATURES (INDUSTRIAL ISOLATED RS232 TO
RS485 RS422 CONVERTER)
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Industrial grade Enclosed in a rugged, rustless ABS housing.
- Direct DIN-Rail (Rack)
or Wall / Panel mounting.
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Converts RS232 to 2-wire RS485, 4-wire RS485 or 4-wire RS422 and vice versa.
- 300 to 115.2K Baud operation (auto-sensing & self-adjusting).
- Built-in selectable 120Ω terminator for system reliability
and easy installation.
- External
9-30VDC powered, no port power from the RS-232 port is required.
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Optical
isolation effectively protects RS-232 devices from ground loops,
noise
problems, transient surges, remote lightning and spikes.
- Supports up to 128 nodes of RS-485/422 devices.
- RS-485/RS-422 auto-detection, no manual setting is required.
- No drivers needed.
- No DIP switch or jumper settings.
- Plug and play (hot-pluggable, data format auto-sensing &
self-adjusting).
- Data direction auto-turnaround, no flow control is required.
- Operating temperature: -40ºF to 185ºF (-40ºC to 85ºC).
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Built-in 600W
surge protection, 15kV static protection and circuit
protection.
- Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
- Safety: Strictly certified by TUV
(Cert No.
SG-CE-100005; SG-FCC-100002).
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5-year
manufacturer's warranty. |
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SPECIFICATIONS (INDUSTRIAL ISOLATED RS232
TO RS485 RS422 CONVERTER)
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Part Number: |
CVT-485_422-4 |
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Compatibility: |
EIA/TIA
RS-232, RS-485 and RS-422 standards |
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Power Source: |
9 to 30VDC
(External AC to DC power adapter included) |
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External AC/DC
Power Adapter: |
9VDC/500mA
(Input: 100~240VAC 50/60Hz, US type A plug) |
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Current
Consumption: |
Less than
30mA |
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Optical
Isolation: |
2500Vrms (AC,
1min) |
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Baud
Rates: |
300 to 115,200bps (auto-sensing and
self-adjusting) |
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Distance: |
RS-232: 16ft
(5m);
RS-485/RS-422: up to 4000ft (1.2km) at 19,200bps |
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Maximum No. of Nodes: |
RS-485/RS-422:
128 nodes |
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Connector: |
1x DB-9
Female; 1x 10-way
Terminal Block |
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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): |
4.7 x 3.6 x
0.9 in (120 x 73 x 33 mm) |
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Weight: |
4.6 oz (130
g) (with terminal block) |
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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 |
TX+/A+ |
TX-/B- |
GND2 |
RX+ |
RX- |
J1 |
J2 |
J3 |
J4 |
9~30V |
GND1 |
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RS485 |
485+ |
485- |
RS485 GND |
- |
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- |
Tie to ON 120Ω |
DC+ |
DC/RS-232 GND |
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RS422 |
TX+ |
TX- |
RS422 GND |
RX+ |
RX- |
Tie to ON 120Ω |
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DC+
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DC/RS-232 GND |
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10-Way Terminal Block |
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120 OHM END-OF-LINE TERMINATOR
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1) RS485 Mode |
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- Tie pin J3 and J4 to turn
ON the 120 Ohm End-of-Line terminator. |
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2) RS422 Mode |
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- Tie pin J1 and J2 to turn
ON the 120 Ohm End-of-Line terminator. |
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CONNECTIONS (RS485 BUS, RS422
BUS, RS232 DISTANCE 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 RS-232
Distance with Opto-Isolation |
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INSTALLATIONS
(EXTERNALLY-POWERED RS232 RS485 RS422 CONVERTER) |
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Figure 4: DIN-RAIL
(RACK) MOUNTING |
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Figure 5: WALL/PANEL MOUNTING |
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[+]
TROUBLESHOOTING OPTO-ISOLATED RS232 RS485 RS422 CONVERTER
1) Make sure
the power is connected and turned on.
2)
Check the connections according to the above
“CONNECTIONS” diagrams.
3) Loopback Test:
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Connect a CVT-485_422-4 to your PC's COM port and
connect TX+ to RX+, TX- to RX- (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.
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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