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INTRODUCTION (USB TO DUAL
RS485 CONVERTER)
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(Windows 7
supported!)
$105.95
In stock
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This
port-powered, bi-directional
USB
to dual RS485 converter
allows you to convert any standard full-duplex USB port into
two half-duplex 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 RS485 devices, and it comes with
built-in 120-Ohm terminators for system reliability and easy
installation
(see
Application Note).
The USB
to dual 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.
This
high-quality, high-performance
USB to dual RS485 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 |
product selection guide
 testing
info |
 declaration
of conformity
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PRODUCT PHOTO |
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FEATURES (USB TO DUAL RS485
CONVERTER / ADAPTER)
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- Adds
two RS-485 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 RS485
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 RS485 CONVERTER
/ ADAPTER)
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Part Number: |
USB-232A-1+2xCVT-485-1 |
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Compatibility: |
USB 2.0
(backward compatible) and EIA/TIA RS-485 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-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: |
5.5 oz (155 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 Side (2 nos.) |
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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 USB RS485 Converter comes with a 4-way terminal block
(RS485 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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120 OHM END-OF-LINE JUMPER
SETTINGS (RS485 BUS)
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Important: Turn ON
Jumper 120 (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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CONNECTIONS (RS485 BUS)
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TROUBLESHOOTING INSTRUCTIONS
FOR USB TO RS485 CONVERTER
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1) Driver installation |
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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). |
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3) Loopback Test |
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Connect a USB-Dual-RS485 converter to your PC’s USB port
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.
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Screenshot 1: Send commands
from 1st instance of the 232Analyzer software.
Screenshot 2: Receive commands
from 2nd instance of the 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
RS-485/RS422:
Building a reliable RS485/RS422 network |
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