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INTRODUCTION (USB
TO DUAL RS422 CONVERTER)
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(Windows 7
supported!)
$131.95
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This
port-powered, bi-directional
USB
to dual RS422/RS485 converter
can be used to convert any standard
full-duplex USB port into two RS422 or RS485 ports and vice
versa. The unit can be used to communicate with up to two
loops (each loop support up to 128 nodes) of RS422 or RS485
devices, and it comes with built-in 120 Ohm terminators for
system reliability and easy installation
(see
Application Note).
The unit
is powered from the USB port and it supports data
auto-sensing & self-adjusting, no baud rate setting is
required. And with the data direction auto-turnaround
technology, no external power or flow control is required
for RS485 communications.
This
high-quality, high-performance USB to dual RS422 converter
is backed by our 30-day risk-free money-back
guarantee and 5-year replacement warranty. It
uses the latest FTDI chipset and is fully
compatible with Windows 7/Vista/XP/Server2008/ Server2003/2000/98
(32-bit), Windows 7/Vista/XP/ Server2008/Server2003 (64-bit), Win CE, Mac, and Linux.
Baud
rates: 300 to 115.2K Baud.
datasheet |
download drivers |
FAQs
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product selection guide
 testing
info |
 declaration
of conformity
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PRODUCT PHOTO |
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FEATURES (USB TO DUAL RS422
CONVERTER)
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- Adds
two RS-422 ports to your USB port.
- 300 to 115.2K Baud operation (auto-sensing and
self-adjusting).
- Communicate with two loops of up to 2x 128 units of RS422
devices.
- Built-in 120Ω end-of-line terminator for
system reliability and easy installation.
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Data direction auto-turnaround, no flow control is required.
- Supports
Windows 7/Vista/XP/Server2008/Server2003/2000/98
(32-bit), Windows
7/Vista/XP/Server2008/Server2003 (64-bit), Win CE, Mac, and Linux.
- Supports remote wakeup and power management.
- Plug and play (hot-pluggable, data format
auto-sensing and self-adjusting).
- Port-powered, no external power required.
- No IRQs required, no IRQ conflicts.
- Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
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Safety: Strictly certified by world-class lab SGS/TUV
(Cert
No. EM/2008/20062C,
EM/2008/20063C,
SG-CE-090012).
- 5-year
manufacturer's warranty. |
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SPECIFICATIONS (USB TO
DUAL RS422 CONVERTER)
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Part Number: |
USB-232A-1+2xCVT-485_422-1 |
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Compatibility: |
USB 2.0
(backward compatible) and EIA/TIA RS-485 / RS-422 standards |
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Power Source: |
From USB port |
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Current
Consumption: |
Less than
100mA |
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Baud
Rates: |
300 to 115,200bps (Auto-sensing &
Self-adjusting) |
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Distances: |
USB side: 10ft (3m); RS-485 side: Depending on
the power from USB port,
will transmit up to 4000ft (1.2km) at 19,200bps |
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Connectors: |
USB
Side: Type A Female; RS-422/485
Side: 2x DB-9 Male; 2x Termination Board (DB-9 Female and a 4-Way
Terminal Block) |
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Maximum number of drops: |
2x 128 |
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End of Line Terminator: |
120Ω (Built-in) |
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Dimensions (H x W x D): |
0.9 x 2.8 x 6.2 in (24 x 72 x 158 mm)
(excluding cable) |
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Cable
Length: |
2 ft (0.6
m) |
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Weight: |
5.7 oz (163 g) |
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Operating Temperature: |
32ºF to
95ºF (0ºC to 35ºC) |
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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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USB
Side |
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USB
Type A Connector (view from front) |
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RS485 / RS422 Side (2 nos.) |
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Pin |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
4 |
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Jumper |
J2
(default: ON) |
J3
(default: ON) |
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J1
(default: ON) |
J4
(default: ON) |
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RS485 |
A+ (J2 ON) |
B- (J3 ON) |
GND |
(J1 ON) |
Terminate/remove Jumper J4
to turn ON/OFF the 120Ω
end-of-line terminator. |
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RS422 |
(J2 OFF) |
(J3 OFF) |
GND |
(J1 OFF) |
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TX+ |
RX+ |
TX- |
RX- |
GND |
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 Note:
The USB RS422 Converter comes with a 6-way terminal block
(RS485/RS422 side) 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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JUMPER SETTINGS FOR RS485 /
RS422 MODES AND 120 OHM END-OF-LINE TERMINATOR
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1) USB to RS485 Mode |
- Turn ON Jumper 1, 2 & 3 for RS-485 mode;
- Important: Turn ON
J4 (120 Ohm End-Of-Line Terminator) at both ends of
the RS-485 bus when its distance is over 660ft (200m). |
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2) USB to RS422 Mode |
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- Turn OFF Jumper 1, 2 & 3 for
RS-422 mode;
- Important: Turn ON
J4 (120 Ohm End-Of-Line
Terminator) at both ends of
the RS-422 bus when its distance is over 660ft (200m). |
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CONNECTIONS (RS485 BUS / RS422
BUS)
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TROUBLESHOOTING
RS485 TO TTL 5V CONVERTER
1) Driver installation
Make sure
that the USB-Dual-RS485 converter is connected to your USB port, and the
driver is installed correctly (as shown above); otherwise, please
reinstall the driver (refer to user
manual for details).
2) Loopback Test
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Connect a USB-Dual-RS422 converter to your PC's USB port and remove
Jumper 1 and terminate Jumper 2 and 3 on the RS485/422
terminal block (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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