OPTO-ISOLATED USB TO RS232 RS485 RS422 CONVERTER
INDUSTRIAL ISOLATED USB TO RS232 RS485 RS422 CONVERTER
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The USB-Serial-3 is a rugged, industrial-grade, optically-isolated USB to RS232/RS485/RS422 converter, which can be used to convert any standard USB port into a three-wire RS-232 port, a two-wire RS-485 port, or a four-wire RS-422/RS-485 port and vice versa.
This industrial opto-isolated USB to RS232 / RS485 / RS422 converter uses the latest chipset from Silicon Labs and is fully compatible with Windows 8 / 7 / Vista / XP / Server2003 / 2000 (32-bit), Windows 8 / 7 / Vista (64-bit), Win CE (5.0, 6.0), Mac OSX, and Linux (2.6x, 2.4.36). It supports multi-drop RS485/RS422 networks and can be used to communicate with one loop of up to 128 units of RS485 or RS422 devices; when working with RS-485 signals, the CommFront’s auto-turnaround feature eliminates the need for flow control. This USB Serial Converter product operates within a temperature range of -40ºF to 185ºF (-40ºC to 85ºC), features 600W surge protection, 15kV static protection and 2500V opto-isolation circuitry, which effectively protect your USB devices from ground loops, noise problems, transient surges, remote lightning and spikes. The device comes with a built-in selectable 120-Ohm terminator for system reliability and easy installation. The unit is powered from the USB port and it features data format auto-sensing and self-adjusting; therefore, no DIP switch or jumper settings are required. And thanks to the professional and unique casing design, the product can be mounted directly on a wall, panel or DIN Rail, without a need of using any unsecured DIN-Rail or wall-mount brackets.
CommFront's product quality is ensured by our strict ISO 9001:2008 quality control system, and we back our high-quality USB Serial converter products with a 30-day risk-free money-back guarantee and a 5-year replacement warranty. Read more: 5 tips for choosing quality converter products
- Adds one RS-232, RS-485 or RS-422 port to your USB port.
- USB port-powered, no external power required.
- Industrial grade enclosed in a rugged, rustless ABS housing.
- Supports multi-drop RS485/RS422 networks (up to 128 nodes).
- 2500V optical isolation effectively protects USB devices from ground loops, transient surges, remote lightning and spikes.
- 300 to 115.2K Baud operation (auto-sensing and self-adjusting).
- Direct DIN-Rail (Rack) or Wall / Panel mounting.
- Plug and play (hot-pluggable, data format auto-sensing and self-adjusting).
- Data direction auto-turnaround, no flow control is required.
- Built-in 120Ω end-of-line terminator for system reliability and easy installation.
- Supports Windows 8/7/Vista/XP/Server2003/2000 (32-bit), Windows 8/7/Vista(64-bit), Win CE, Mac, and Linux.
- Operating temperature: -40ºF to 185ºF (-40ºC to 85ºC).
- Built-in 600W surge protection, 15kV static protection and circuit protection.
- Surface Mount Technology manufactured to RoHS and ISO-9001 standards.
- Safety: Strictly certified by TUV (Cert No. SG-CE-100004; SG-FCC-100001).
- 5-year manufacturer's warranty.
|Compatibility:||USB 2.0 and EIA/TIA RS-232/485/422 standards|
|Power Source:||From USB port|
|Current Consumption:||Less than 200mA|
|Baud Rates:||300 to 115,200bps (auto-sensing & self-adjusting)|
|Optical Isolation:||2500Vrms (AC, 1 min)|
|Distances:||USB: 10ft (3m); RS-232: 16ft (5m); RS-485/422: Depending on the power from USB port, will transmit up to 4000ft (1.2km) at 19,200bps|
|Connectors:||USB: Type B male; RS-232/485/422: 10-Way Terminal Block|
|Accessories:||1x 5ft (1.6m) USB extension cord (Type B female to Type A female)|
|Maximum number of drops:||RS-232: 1; RS-485/422: 128|
|End of Line Terminator:||120Ω (built-in, selectable)|
|Static Protection (ESD):||15kV|
|Dimensions (H x W x D):||4.5 x 3.6 x 0.9 in (115 x 73 x 33 mm)|
|Weight:||4.2 oz (120 g) (with terminal block)|
|Operating Temperature:||-40ºF to 185ºF (-40ºC to 85ºC)|
|Operating Humidity:||Up to 90% RH (no condensation)|
CONVERTER CONNECTOR / TERMINAL BLOCK PIN OUTS
USB Type B Male Connector (view from front)
|USB Type A Female Connector (view from front)|
|RS485||485+||485-||-||-||-||Tie to ON 120Ω||GND||-||-|
|RS422||TX+||TX-||RX+||RX-||Tie to ON 120Ω||-||-||GND||-||-|
CONNECTIONS (USB RS232 RS485 RS422 CONVERTER)
Figure 1: USB to RS232 Connection
Figure 2: Master-Slave Multi-Drop Connections (RS485)
Figure 3: Master-Slave Multi-Drop Connections (RS422)
Install drivers from the CD provided with the product (as shown above).
The latest drivers (chipset: Silicon Labs’ CP210x) are available at:
TROUBLESHOOTING USB RS232 RS485 RS422 CONVERTER
1) Driver installation
Make sure that the USB-Serial-3 converter is connected to your USB port, and the driver is installed correctly (as shown above); otherwise, please reinstall the drivers.
2) Loopback Test
- Connect a USB-Serial-3 to your PC's COM port and connect TX+ to RX+, TX- to RX- (as shown above).
- Run 232Analyzer FREE version software on your computer.
- Select "ASCII" for both the Send and Receive data formats. Then send a 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.