OPTO-ISOLATED RS232 TO RS422 CONVERTER

Isolated RS232 to RS422 Converter, CommFront industrial RS422 converter

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Opto Isolated RS232 to RS485 RS422 Converter  


ISOLATED RS232 to RS422 CONVERTER

- Industrial grade.
- Optical isolation protects RS232 devices.
- Port powered.
- Auto-turnaround.
- Plug-and-play.
- Built-in 120
Ω end-of-line terminator.
-
CE certified.
- 5-year manufacturer's warranty.
         
 

RS232 to RS422 Converters

 

OPTO-ISOLATED RS232 TO RS422 CONVERTER (INDUSTRIAL GRADE)

 

RS232 to RS422 Converter

 
 

RS232 to RS422/485 Converter

 
 

Isolated RS232 to RS422 Converter

 
 

Isolated RS232 RS422/485 Converter

 
 

RS485 to RS422 Converter

 
     
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Quality products with 30-Day Satisfaction Guarantee & 5-Year Warranty.


FREE worldwide shipping / optional same day EXPRESS shipping on all products!

 

Testimonials

"I am communicating with kWh (energy) meters that have the RS485 built in, the port-powered converter's auto-turnaround feature works really well for my application, and I don't have to change any configuration."
Peter
"232Analyzer is a nice piece of software. It's checksum calculator helped me to analyze pretty tough serial communication protocol."
Timo
 
   

CommFront offers a range of high-quality, industrial-grade, port-powered RS232 to RS422 converters. These plug-and-play 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 RS485 / RS422 converter 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 converters and isolators provide simple and effective ways to protect your devices from such potential harms.

 

RS232 TO RS485 / RS422 CONVERTER SELECTION TABLE

 Part Number  Description  Price
CVT-422-1 RS232 <=> 4-wire RS422 Converter
(Industrial/Port-powered/300 to 115.2K Baud)
$47.95
Order
CVT-485_422-1 RS232 <=> 2-wire RS485 or 4-wire RS422 Converter
(Industrial/Port-powered/300 to 115.2K Baud)
$54.95
Order
CVT-422-3 RS232 <=> 4-wire RS422 Converter
(Isolated/Industrial/Port-powered/300 to 57.6K Baud)
$74.95
Order
CVT-485_422-3 RS232 <=> 2-wire RS485 or 4-wire RS422 Converter
(Isolated/Industrial/Port-powered/300 to 57.6K Baud)
$79.95
Order

   

INTRODUCTION (ISOLATED RS232 TO RS422 CONVERTER)

Isolated RS232 to RS422 Converter The CVT-422-3 is an industrial grade (wide temperature range with surge & static protection) optically isolated bi-directional RS-232 to RS-422 converter, which can be used to convert any standard RS-232C port into a four-wire full-duplex RS-422 port and vice versa.

This product features opto-isolation circuitry, which effectively protect your RS-232 devices from ground loops, transient surges and spikes. The unit is powered from the RS-232 data line, and therefore, no external power or flow control is required.

$84.95 $74.95
Order Here

data sheet FAQs
       

FEATURES (ISOLATED RS232 TO RS422 CONVERTER)

 
- Converts RS232 to RS422 (with opto-isolation) and vice versa.
- Industrial grade with wide temperature range, surge and static protection.
- Optical isolation effectively protects your RS-232 devices from ground loops, transient surges and spikes.
- Optical isolation eliminates ground loop and noise problems.
- Plug and play (hot-pluggable, data format auto-sensing & self-adjusting).
- Port-powered, no external power or RTS, DTR required.
- 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.
   

SPECIFICATIONS (ISOLATED RS232 TO RS422 CONVERTER)

Part Number:

CVT-422-3

Compatibility:

EIA/TIA RS-232C standard and RS-485/RS-422 standard

Power Source:

Port power from RS232 data line

Current Consumption: Less than 10mA
Optical Isolation: 2500Vrms (AC, 1 min)

Baud Rates:

300 to 57,600bps (auto-sensing & self-adjusting)

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

Connector:

RS232 Side: DB-9 Female; RS422 Side: DB-9 Male; Termination Board: DB-9 Female and a 6-Way Terminal Block

Maximum number of drops:

64

End of Line Terminator:

120Ω (Built-in)

Surge protection: 600W

Static protection (ESD):

Up to 15KV

Dimensions (H x W x D):

0.63 x 1.3 x 3.5 in (16 x 32 x 90 mm)

Weight:

1.4 oz (40 g)

Operating Temperature:

-40ºF to 185ºF (-40ºC to 85ºC)

Operating Humidity:

Up to 90% RH (no condensation)

   
 

CONVERTER CONNECTOR / TERMINAL BLOCK PINOUTS

 
 

RS232 Side

Pin 1 4 6 7 8 2 3 5
Signal DCD DSR DTR CTS RTS TX RX GND
Function Tied Tied TX RX GND
Isolated RS232 to RS422 converter - RS232 DB9 Female PinoutsNote: 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.  

DB-9 Female (view from front)

RS422 Side

DB9 Pin 1 2 3 4 5 9 8 4
Terminal Block / Function TX+ RX+ TX- RX- GND +5V measurement Terminate/remove J4 to
turn ON/OFF the 120Ω
end-of-line terminator.
   
  RS422 to RS232 converter, RS232 to RS422 DB9 and Terminal BlockNote: 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.
  DB-9 Male (view from front) / Terminal Block
   
 

120 OHM END-OF-LINE JUMPER SETTINGS

 
  RS422 bus 120 Ohm end-of-line terminator
  IMPORTANT: Turn ON J4 (120 Ohm End-Of-Line Terminator) at both ends of the RS-422 bus.
   

CONNECTIONS (RS422 BUS, RS232 EXTENSION WITH OPTO-ISOLATION)

Isolated RS232 RS422 Converter Connection

Figure 1: Master-Slave Multi-Drop Connections (RS422)

RS232 to RS422 Isolated Converter wiring diagram

Figure 2: Extending Full-Duplex RS232 Distance (with opto-isolation)

TROUBLESHOOT RS232 TO RS422 ISOLATED CONVERTER

1) Port power measurement
RS232 to RS422 Isolated Converter - 5V measurement
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).
RS232 port power measurement - DTE and DCE
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_422-3 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.
 
2) Loopback Test
RS232 to RS422 industrial isolated converter loopback test
  • 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.
  • 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.
RS232 to RS422 converter - loopback test 2
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