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Industrial Port-Powered RS232 to RS485 Converter
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Model: CVT-485-1
$32.95
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The CVT-485-1 is
a compact, rugged, industrial-grade, port-powered, bi-directional
RS232 to RS485
converters, which can be used to convert any standard
unbalanced RS-232C
port into a two-wire half-duplex balanced RS485 port and vice versa.
This
industrial RS232 to RS485 converter
operates within a
temperature range of -40ºF to 185ºF (-40ºC to 85ºC), features 600W surge protection and
15kV static protection, and comes with
an optional 120-Ohm terminator
for system reliability and easy installation.
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 optional 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 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
(INDUSTRIAL RS232 TO RS485 CONVERTER)
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FEATURES (INDUSTRIAL RS232 TO
RS485 CONVERTER / ADAPTER)
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- Converts RS232 to 2-wire RS485 and vice versa.
- 300 to 115.2K Baud operation (auto-sensing & self-adjusting).
- Built-in optional 120Ω 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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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 software drivers or flow control 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 (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 |
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 when the data rate is over 19.2kbps or the
distance exceeds 660 feet (200m). |
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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 RS232 TO 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-485-1 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.
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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