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INTRODUCTION (USB
TO RS422 CONVERTER)
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(Windows 7
supported!)
$94.95
Order Here |
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This USB
to RS422 converter
/ USB to RS485 converter
is a port-powered bi-directional USB to RS422 / RS485 converter,
which can be used to convert any standard full-duplex USB
port into a four-wire RS485 / RS422 port or a 2-wire RS485
port and vice versa.
The unit can be used to communicate with one loop of
up to
128 units of RS422 / RS485 devices,
and it comes with
a built-in 120 Ohm terminator
for easy installation.
The USB
to RS422 converter
/ USB to RS485 converter
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.
The
USB
to RS422 converter
/ USB to RS485 converter
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.
data sheet |
download drivers |
FAQs
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FEATURES (USB TO RS422
CONVERTER)
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Adds
one 4-wire RS-422 / RS-485 (or 2-wire RS485) port to your USB port. |
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Communicate with one loop of up to 128 units of RS422 /
RS485
devices. |
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Built-in 120Ω end-of-line terminator for
easy installation. |
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Data direction auto-turnaround, no flow control is required. |
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Supports 300 to 115,200 baud (auto-sensing and
self-adjusting) |
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Supports
Windows 7/Vista/XP/Server2008/Server2003/2000/98
(32-bit), Windows 7/Vista/XP/Server2008/Server2003 (64-bit), Win CE, Mac, and Linux. |
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Supports remote wakeup and power management. |
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Plug and play (hot-pluggable, data format
auto-sensing and self-adjusting). |
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Port-powered, no external power required. |
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No IRQs required, no IRQ conflicts. |
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CE certified. |
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5-year
manufacturer's warranty. |
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SPECIFICATIONS (USB TO RS422 CONVERTER
/ ADAPTER)
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Part Number: |
USB-232-1+CVT-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/RS-422 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-485/RS-422
Side: DB-9 Male; Termination Board: DB-9 Female and a 6-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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Dimensions (H x W x D): |
0.63 x 1.3 x 5.5 in (16 x 32 x 140
mm)
(excluding cable) |
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Cable
Length: |
3.3 ft (1
m) |
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Weight: |
4.3 oz (123 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 |
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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 |
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- 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. |
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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 (or 4-wire
RS-485) bus. |
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CONNECTIONS (RS485 BUS / RS422
BUS)
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TROUBLESHOOTING INSTRUCTIONS
FOR USB TO RS422 CONVERTER
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1) Driver installation |
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Make sure
that the USB-RS422 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). |
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2) Port power measurement |
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Measure pin
+5V and GND with a voltmeter, and be sure that it is around
+5VDC (when USB port is connected). |
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3) Loopback Test |
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Connect a USB-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.
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Screenshot: Send/receive
commands from 232Analyzer software. |
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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 |
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