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USB TO RS485 CONVERTER / USB TO RS485 ADAPTER
INTRODUCTION (USB TO RS485 CONVERTER / ADAPTER)
This port-powered, bi-directional USB to RS485 converter can be used to convert any standard full-duplex USB port into a two-wire balanced half-duplex RS485 port and vice versa.
The unit can be used to communicate with one loop of up to 128 units of RS485 devices and it comes with a built-in selectable 120-Ohm terminator for system reliability and easy installation (see Application Note). This USB to RS485 converter is powered from the USB port and it supports data auto-sensing & self-adjusting, therefore, 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 RS485 adapter uses the latest FTDI chipset and is fully compatible with Windows 8/7/Vista/XP/Server2008/ Server2003/2000/98 (32-bit), Windows 8/7/Vista/XP/ Server2008/Server2003 (64-bit), Win CE, Mac, and Linux.
CommFront's product quality is ensured by our strict ISO 9001:2008 quality control system, and we back our high-quality USB RS485 converter / adapter products with a 30-day risk-free money-back guarantee and a 5-year replacement warranty.
PRODUCT PHOTOS (usb to rs485 converter / adapter)
FEATURES (USB RS485 CONVERTER / ADAPTER)
- Adds one RS-485 port to your USB port.
- Communicate with one loop of up to 128 units of RS485 devices.
- 300 to 115.2K Baud operation (auto-sensing and self-adjusting).
- Built-in 120Ω end-of-line terminator for system reliability and easy installation.
- Data direction auto-turnaround, no flow control is required.
- Supports Windows 8/7/Vista/XP/Server2008/Server2003/2000/98 (32-bit), Windows 87/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.
- Safety: Strictly certified by world-class lab SGS / TUV (Cert No. EM/2008/20060C, EM/2008/20061C, SG-CE-090012).
- 5-year manufacturer's warranty.
SPECIFICATIONS (USB RS485 CONVERTER / ADAPTER)
| Part Number: | USB-232-1+CVT-485-1 |
| Compatibility: | USB 2.0 (backward compatible) and EIA/TIA RS-485 standards |
| Power Source: | From USB port |
| Current Consumption: | Less than 100mA |
| Baud Rates: | 300 to 115,200bps (Auto-sensing & Self-adjusting) |
| 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 |
| Connectors: | USB> Side: Type A Female; RS-485 Side: DB-9 Male; Termination Board: DB-9 Female and a 4-Way Terminal Block |
| Maximum number of drops: | 128 |
| End of Line Terminator: | 120Ω (Built-in) |
| Dimensions (H x W x D): | 0.63 x 1.3 x 5.5 in (16 x 32 x 140mm) (excluding cable) |
| Cable Length: | 3.3 ft (1 m) |
| Weight: | 3.5 oz (100 g) |
| Operating Temperature: | 32ºF to 95ºF (0ºC to 35ºC) |
| Operating Humidity: | Up to 90% RH (no condensation) |
CONVERTER CONNECTOR / TERMINAL BLOCK PIN OUTS
USB Side
USB Type A Connector (view from front)
RS485 Side
| DB-9 Pin | 1 | 3 | 5 | 9 | 6 | 7 |
| Terminal Block | A+ | B- | GND | +5V | Jumper (120) | |
| Function | RS485+ | RS485- | GND | +5V measurement | Terminate/remove Jumper 120 to turn ON/OFF the 120Ω end-of-line terminator. | |
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.
 |
| DB-9 Male / Terminal Block (view from front) |
120 OHM END-OF-LINE JUMPER SETTINGS (RS485 BUS)
Important: Turn ON Jumper 120 (120 Ohm End-Of-Line Terminator) at both ends of the RS-485 bus when the data rate is over 19.2kbps or the distance is over 660ft (200m).
CONNECTIONS (RS485 BUS)
TROUBLESHOOTING USB TO RS485 CONVERTER
1) Driver installation
Make sure that the USB-RS485 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 two numbers of the USB-RS485 converter to your PC’s USB ports and connect A+ to A+, B- to B- on the RS485 terminal blocks (as shown above).
- Run two instances of the 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 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.
Screenshot 1: Send commands from 1st instance of the
232Analyzer software
Screenshot 2: Receive commands
from 2nd instance of the 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
