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Industrial Port-Powered Opto-Isolated RS232/RS485 Converter
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Model:
CVT-485-3
$64.95
In stock
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The CVT-485-3 is
a compact,
rugged,
industrial-grade, optically-isolated, port-powered, bi-directional
RS232 to RS485 converter,
which can be used to convert any standard unbalanced RS232C port into
a two-wire half-duplex balanced RS485 port and vice versa.
This
industrial opto-isolated RS232 to RS485 converter
operates within 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 also supports data
direction auto-turnaround, which automatically enables the
RS485 transceiver when data is present on the RS232 side.
Therefore,
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: 1.2K to 57.6K Baud.
datasheet | 
FAQs |
product selection guide
 rs485/rs422 application note
 testing
info |
 declaration
of conformity |
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PRODUCT PHOTOS
(ISOLATED RS232 TO RS485 CONVERTER)
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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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1.2K to 57.6K Baud operation (auto-sensing & self-adjusting).
- Built-in 120Ω end-of-line terminator for system reliability and easy installation.
- Industrial
grade with temperature range of -40ºF to 185ºF (-40ºC to 85ºC), surge
(600W) and static protection (15kV).
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Port-powered, no external power or RTS, DTR required.
- Accepts external 5VDC regulated power if the port-power is
insufficient.
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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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Optical isolation eliminates ground loop and noise problems.
- No drivers needed.
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Plug and play (hot-pluggable, data format auto-sensing &
self-adjusting).
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Data direction auto-turnaround, no flow control is required.
- Built-in
surge
protection, static protection and circuit protection.
- Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
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Safety: Strictly certified by TUV (Cert No. SG-CE-090012).
- 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 when the data rate is over
19.2kbps or the distance exceeds 660 feet (200m). |
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CONNECTIONS (RS485 BUS)
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Figure 1: Master-Slave
Multi-Drop Connections |
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[+]
TROUBLESHOOTING OPTO-ISOLATED RS232 RS485 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 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.
Screenshot 1: Send commands
from 1st instance of the 232Analyzer software.
Screenshot 2: Receive commands
from 2nd instance of the 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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